EXOGEN INC
SC 14D9, 1999-08-02
ELECTROMEDICAL & ELECTROTHERAPEUTIC APPARATUS
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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

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                                 SCHEDULE 14D-9

               Solicitation/Recommendation Statement Pursuant to
            Section 14(d)(4) of the Securities Exchange Act of 1934

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                                  EXOGEN, INC.
                           (Name of Subject Company)

                                  EXOGEN, INC.
                       (Name of Person Filing Statement)

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                    Common Stock, Par Value $.0001 Per Share
                         (Title of Class of Securities)

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                                  302092-10-1
                     (CUSIP Number of Class of Securities)

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                              Patrick A. McBrayer
                     President and Chief Executive Officer
                                  Exogen, Inc.
                              10 Constitution Ave.
                          Piscataway, New Jersey 08855
                                 (732) 981-0990
      (Name, Address and Telephone Number of Persons Authorized to Receive
   Notices and Communications on behalf of the person filing this Statement)

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                                   Copies to:

                            Ellen B. Corenswet, Esq.
                           Luci Staller Altman, Esq.
                        Brobeck, Phleger & Harrison LLP
                           1633 Broadway, 47th Floor
                            New York, New York 10019
                                 (212) 581-1600

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                                 INTRODUCTION

   This Solicitation/Recommendation Statement on Schedule 14D-9 (this
"Schedule 14D-9" or this "Statement") relates to an offer by Smith & Nephew
Acquisition, Inc., a Delaware corporation and wholly-owned subsidiary of Smith
& Nephew, Inc., a Delaware corporation, to purchase all of the Shares (as
defined below) of Exogen, Inc., a Delaware corporation. Capitalized terms used
herein and not otherwise defined shall have the meaning assigned to them in
the Offer to Purchase dated July 30, 1999.

Item 1. Security and Subject Company.

   The name of the subject company is Exogen, Inc., a Delaware corporation
(the "Company"), and the address of the principal executive offices of the
Company is 10 Constitution Avenue, Piscataway, New Jersey 08855. The title of
the class of equity securities to which this statement relates is the
Company's common stock, par value $.0001 per share (together with the
preferred stock purchase rights associated therewith, the "Shares").

Item 2. Tender Offer of the Bidder.

   This Statement relates to the tender offer (the "Offer") described in the
Tender Offer Statement on Schedule 14D-1 dated July 30, 1999 (as amended or
supplemented, the "Schedule 14D-1"), filed by Smith & Nephew Acquisition,
Inc., a Delaware corporation ("Purchaser"), a wholly owned subsidiary of Smith
& Nephew, Inc, a Delaware corporation ("Parent"), and an indirect wholly-owned
subsidiary of Smith & Nephew plc, a corporation organized under the laws of
England and Wales ("S&N"), with the Securities and Exchange Commission (the
"Commission") relating to an offer by Purchaser to purchase all the issued and
outstanding Shares at a price of $5.15 per Share, net to the seller in cash,
without interest thereon (the "Offer Price"), upon the terms and subject to
the conditions set forth in Purchaser's Offer to Purchase dated July 30, 1999,
as amended or supplemented, and the related Letter of Transmittal (which
together constitute the "Offer Documents"). The Offer Documents indicate that
the principal executive offices of Parent and Purchaser are located at 1450
Brooks Road, Memphis, Tennessee 38116.

   The Offer is being made pursuant to the Agreement and Plan of Merger dated
as of July 25, 1999 (the "Merger Agreement"), among the Company, Parent and
Purchaser. A copy of the Merger Agreement is filed as Exhibit 1 to this
Schedule 14D-9 and is incorporated herein by reference in its entirety.
Pursuant to the Merger Agreement, following the consummation of the Offer,
upon the satisfaction or waiver of certain conditions, Purchaser will be
merged with and into the Company (the "Merger"). In the Merger, each Share
outstanding immediately prior to the effective time of the Merger (other than
Shares owned by the Company, any wholly-owned subsidiary of the Company,
Parent, Purchaser or any other subsidiary of Parent, or Smith & Nephew
Holdings, Inc., a Delaware corporation ("Holdings"), or by stockholders, if
any, who are entitled to and who properly exercise their dissenters' rights
under the General Corporation Law of the State of Delaware (the "DGCL")) will,
by virtue of the Merger and without any action by the holder thereof, be
converted into the right to receive $5.15 per Share (or any higher price paid
per Share in the Offer), net to the seller in cash, without interest thereon
(the "Merger Consideration"), upon the surrender of the certificate formerly
representing such Share. The Merger Agreement is summarized in Item 3 of this
Schedule 14D-9.

Item 3. Identity and Background.

   a. The name and address of the Company, which is the person filing this
Schedule 14D-9, are set forth in Item 1 above. Unless the context otherwise
requires, references to the Company in this Schedule 14D-9 are to the
"Company" and its direct and indirect subsidiaries, viewed as a single entity.

   b. Certain contracts, agreements, arrangements or understandings between
the Company and its executive officers, directors and certain of its
affiliates are described below.

   On August 10, 1998, the Company and Parent entered into a multi-year master
agreement, together with a U.S. sales representative agreement and a stock
purchase agreement, under which Parent obtained exclusive rights to market the
Company's SAFHS devices in the United States. Parent paid $4.1 million (or
$5.00 per share) to purchase 820,000 shares of the Company's Common Stock at
the closing. An additional up-front fee of

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$1.0 million was paid for sales representative rights in the United States.
The agreements also provide Parent with certain options resulting in potential
additional aggregate payments to the Company of $5.0 million. The agreements
also provide Parent a one-time right to purchase additional shares of the
Company's Common Stock, in certain circumstances, up to 19% (including the
shares already acquired by Parent) of the then outstanding shares of the
Company's Common Stock, after giving effect to the shares issuable upon
exercise of the right. Pursuant to the agreements, the Company filed a
registration statement with the Securities and Exchange Commission following
the closing date to register the shares of the Company's Common Stock sold to
Parent under these agreements.

   The Company retained U.S. Bancorp Piper Jaffray Inc. ("U.S. Bancorp Piper
Jaffray") as its financial advisor in connection with the Offer and the
Merger. Pursuant to its agreements with the Company, dated May 4, 1999, U.S.
Bancorp Piper Jaffray became entitled to receive a fee of (i) 1.5% of the
aggregate consideration paid to stockholders in the Merger and (ii) $250,000
upon delivery of a fairness opinion (to be credited against any fee otherwise
payable under clause (i)). In addition, $75,000, which was paid to U.S.
Bancorp Piper Jaffray in connection with its analysis of the Company's
strategic alternatives in early 1999, will be credited against any such fees
due. The Company has agreed to reimburse U.S. Bancorp Piper Jaffray monthly
for its reasonable out-of-pocket expenses incurred in connection with the
Merger. Mr. Benson, a director of the Company, is President and Managing
Director of Piper Jaffray Ventures, a wholly-owned subsidiary of U.S. Bancorp
Piper Jaffray.

   In January 1999, the Company made a loan to Mr. Ryaby, Chairman of the
Board and Chief Scientific Officer of the Company, which is evidenced by a
promissory note for $80,000 due January 22, 2002 with an interest rate of 8%
per annum. It is anticipated that the promissory note will be repaid upon
consummation of the Offer.

   In January 1999, the Company made a loan to Mr. Talish, Vice President and
Chief Technical Officer of the Company, which is evidenced by a promissory
note for $125,000 due January 22, 2002 with an interest rate of 8% per annum.
It is anticipated that the promissory note will be repaid upon consummation of
the Offer.

   Except as described or incorporated by reference herein, to the knowledge
of the Company, as of the date hereof, there exists no material contract,
agreement, arrangement or understanding and no actual or potential conflict of
interest between the Company or its affiliates and (i) the Company's executive
officers, directors or affiliates or (ii) Purchaser or its executive officers,
directors or affiliates.

Merger Agreement

   The following summary of the Merger Agreement is qualified in its entirety
by reference to the Merger Agreement, a copy of which is filed as Exhibit 1 to
this Schedule 14D-9 and is incorporated herein by reference. The Merger
Agreement should be read in its entirety for a more complete description of
the matters summarized below. Capitalized terms used below and not otherwise
defined shall have the meanings assigned to them in the Merger Agreement.

 The Merger Agreement

   The Offer. The Purchaser commenced the Offer in accordance with the terms
of the Merger Agreement. Each of the Company, Parent and the Purchaser has
agreed to use its reasonable best efforts to take, or cause to be taken, all
actions necessary to comply promptly with all legal requirements that may be
imposed on itself with respect to the Offer and the Merger and shall promptly
cooperate with and furnish information to each other in connection with any
such requirements imposed upon any of them in connection with the Offer and
the Merger. Each of the Company, Parent and the Purchaser shall, and shall
cause its subsidiaries to, use its reasonable best efforts to take all
reasonable actions necessary to obtain (and shall cooperate with each other in
obtaining) any consent, authorization, order or approval of, or any exemption
by, any governmental entity or other public or private third party required to
be obtained or made by Parent, the Purchaser or the Company or any of their
subsidiaries in connection with the Offer and the Merger or the taking of any
action contemplated thereby or by the Merger Agreement, except that no party
need waive any substantial rights or agree to any substantial limitation on
its operations or to dispose of any assets.

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   The Merger. The Merger Agreement provides that, upon the terms and subject
to the conditions of the Merger Agreement, and in accordance with the DGCL,
the Purchaser shall be merged with and into the Company at the Effective Time.
Following the Merger, the separate corporate existence of the Purchaser shall
cease and the Company shall continue as the Surviving Corporation and shall
succeed to and assume all the rights and obligations of the Purchaser and the
Company in accordance with the DGCL. At the Effective Time, the Charter and
the By-laws of the Company (the "By-laws") shall be the Charter and By-laws of
the Surviving Corporation, and the directors of the Purchaser shall become the
directors of the Surviving Corporation and the officers of the Company shall
become the officers of the Surviving Corporation.

   Conversion of Securities. As of the Effective Time, by virtue of the Merger
and without any action on the part of the Purchaser, the Company or the
holders of any securities of the Purchaser or the Company, each Share (other
than Shares owned by the Company, any subsidiary of the Company, Holdings,
Parent, the Purchaser, any other subsidiary of Parent or by stockholders, if
any, who are entitled to and who properly exercise dissenter's rights under
the DGCL) shall be converted into the right to receive from the Surviving
Corporation, in cash, without interest, the Offer Price. Each share of stock
of the Purchaser issued and outstanding immediately prior to the Effective
Time shall, at the Effective Time, by virtue of the Merger and without any
action on the part of the holder of any shares of stock of the Purchaser, be
converted into and become one fully paid and nonassessable share of common
stock, $.0001 par value, of the Surviving Corporation.

   Representations and Warranties. In the Merger Agreement, the Company has
made customary representations and warranties to Parent and the Purchaser. The
representations and warranties of the Company relate, among other things, to
its organization, good standing and corporate power; capital structure;
authority to enter into the Merger Agreement and to consummate the
transactions contemplated thereby; required consents and approvals and no
violations; filings made by the Company with the Commission under the
Securities Act and the Exchange Act (including financial statements included
in the documents filed by the Company under these acts); information supplied
by the Company; the absence of certain events since September 30, 1998;
permits and compliance with laws; tax matters; actions and proceedings;
certain agreements; benefit plans and employees and employment practices;
compliance with worker safety laws; liabilities; products; certain labor
matters; intellectual property matters and Year 2000 compliance; title to
assets; state takeover statutes; the Rights Agreement; required votes;
accounts receivable; inventories; environmental matters; suppliers and
employees; insurance; transactions with affiliates; and brokers.

   The Purchaser and Parent have also made customary representations and
warranties to the Company. Representations and warranties of the Purchaser and
Parent relate, among other things, to: their organization, good standing and
authority to enter into the Merger Agreement and the Stockholder Agreements
and to consummate the transactions contemplated thereby; required consents and
approvals and no violations; information supplied; ownership of shares;
operations of the Purchaser; brokers; and financing.

   Rights Agreement. The Merger Agreement provides that the Company and the
Rights Agent shall have executed an amendment to the Rights Agreement
rendering the Rights Agreement inapplicable to the Offer, the Merger and the
transactions contemplated thereby. In accordance with such requirement,
immediately prior to the execution of the Merger Agreement, the Company and
the Rights Agent executed the Second Amendment dated as of July 25, 1999 to
Rights Agreement dated as of December 6, 1996, as amended, between the Company
and the Rights Agent.

   Covenants Relating to the Conduct of Business. During the period from the
date of the Merger Agreement to the Effective Time, the Company has agreed as
to itself and its subsidiaries that, except as otherwise expressly
contemplated or permitted by the Merger Agreement or except to the extent
Parent shall otherwise consent in writing:

     (a) the Company shall, and shall cause each of its subsidiaries to, in
  all material respects carry on its business in the ordinary course of its
  business as currently conducted and, to the extent consistent therewith,
  use reasonable best efforts to preserve intact its current business
  organizations, keep available the services

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  of its current officers and employees and preserve its relationships with
  customers, suppliers and others having business dealings with it to the end
  that its goodwill and ongoing business shall be unimpaired at the Effective
  Time;

     (b) the Company shall not, and shall not permit any of its subsidiaries
  to, (i) other than dividends paid by wholly-owned subsidiaries, declare,
  set aside or pay any dividends on, or make any other actual, constructive
  or deemed distributions in respect of, any of its capital stock, or
  otherwise make any payments to its stockholders in their capacity as such,
  (ii) other than in the case of any subsidiary, split, combine or reclassify
  any of its capital stock or issue or authorize the issuance of any other
  securities in respect of, in lieu of or in substitution for shares of its
  capital stock or (iii) purchase, redeem or otherwise acquire any shares of
  capital stock of the Company or any other securities thereof or any rights,
  warrants or options to acquire any such shares or other securities;

     (c) the Company shall not, and shall not permit any of its subsidiaries
  to, issue, deliver, sell, pledge, dispose of or otherwise encumber any
  shares of its capital stock, any other voting securities or equity
  equivalent or any securities convertible thereinto, or any rights, warrants
  or options (including options under the Company Stock Option Plan) to
  acquire any such shares, voting securities, equity equivalent or
  convertible securities, other than (i) the issuance of Shares upon the
  exercise of Company Stock Options outstanding on the date of the Merger
  Agreement in accordance with their current terms, (ii) the issuance of
  Shares upon exercise of the Warrants, and (iii) the grant of purchase
  rights or issuance of shares under the Stock Purchase Plan in accordance
  with Section 6.5 of the Merger Agreement;

     (d) the Company shall not, and shall not permit any of its subsidiaries
  to, amend its or their charters or by-laws;

     (e) the Company shall not, and shall not permit any of its subsidiaries
  to, acquire or agree to acquire by merging or consolidating with, or by
  purchasing a substantial portion of the assets of or equity in, or by any
  other manner, any business or any corporation, limited liability company,
  partnership, association or other business organization or division thereof
  or otherwise acquire or agree to acquire any assets;

     (f) the Company shall not, and shall not permit any of its subsidiaries
  to, sell, lease or otherwise dispose of, or agree to sell, lease or
  otherwise dispose of, any of its assets with a fair market value in excess
  of $10,000, other than sales of inventory that are in the ordinary course
  of business consistent with past practice;

     (g) the Company shall not, and shall not permit any of its subsidiaries
  to, incur any indebtedness for borrowed money, guarantee any such
  indebtedness or make any loans, advances or capital contributions to, or
  other investments in, any other person, other than (i) in the ordinary
  course of business consistent with past practices and, in the case of
  indebtedness and guarantees, in an amount not to exceed $100,000 and (ii)
  indebtedness, loans, advances, capital contributions and investments
  between the Company and any of its wholly-owned subsidiaries or between any
  of such wholly-owned subsidiaries, in each case in the ordinary course of
  business consistent with past practices;

     (h) the Company shall not, and shall not permit any of its subsidiaries
  to, alter (through merger, liquidation, reorganization, restructuring or in
  any other fashion) the corporate structure or ownership of the Company or
  any subsidiary;

     (i) except as otherwise disclosed by the Company to Parent on the date
  of the Merger Agreement, the Company shall not, and shall not permit any of
  its subsidiaries to, enter into or adopt any, or amend any existing,
  severance plan, agreement or arrangement or enter into or amend any Company
  Plan (as defined in the Merger Agreement) or employment or consulting
  agreement;

     (j) except as otherwise disclosed by the Company to Parent on the date
  of the Merger Agreement, the Company shall not, and shall not permit any of
  its subsidiaries to, increase the compensation payable or to become payable
  to its directors, officers or employees (except for increases in the
  ordinary course of business consistent with past practice in salaries or
  wages of employees of the Company or any of its

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  subsidiaries who are not officers of the Company or any of its
  subsidiaries) or grant any severance or termination pay to, or enter into
  any employment or severance agreement with, any director or officer of the
  Company or any of its subsidiaries, or establish, adopt, enter into, or,
  except as may be required to comply with applicable law, amend in any
  material respect or take action to enhance in any material respect or
  accelerate any rights or benefits under, any labor, collective bargaining,
  bonus, profit sharing, thrift, compensation, stock option, restricted
  stock, pension, retirement, deferred compensation, employment, termination,
  severance or other plan, agreement, trust, fund, policy or arrangement for
  the benefit of any director, officer or employee;

     (k) the Company shall not, and shall not permit any of its subsidiaries
  to, knowingly violate or knowingly fail to perform any obligation or duty
  imposed upon it or any subsidiary by any applicable material federal, state
  or local law, rule, regulation, guideline or ordinance;

     (l) the Company shall not, and shall not permit any of its subsidiaries
  to, make any change to accounting policies or procedures (other than
  actions required to be taken by generally accepted accounting principles);

     (m) the Company shall not, and shall not permit any of its subsidiaries
  to, prepare or file any tax return inconsistent with past practice or, on
  any such tax return, take any position, make any election, or adopt any
  method that is inconsistent with positions taken, elections made or methods
  used in preparing or filing similar tax returns in prior periods;

     (n) the Company shall not, and shall not permit any of its subsidiaries
  to, settle or compromise any Tax liability in excess of $100,000;

     (o) the Company shall not, and shall not permit any of its subsidiaries
  to, settle or compromise any claims or litigation in excess of $100,000 or
  commence any litigation or proceedings;

     (p) the Company shall not, and shall not permit any of its subsidiaries
  to, enter into or amend any agreement or contract (i) having a term in
  excess of 12 months and which is not terminable by the Company or a
  subsidiary without penalty or premium by notice of 60 days or less or (ii)
  which involves or is expected to involve future payments of $100,000 or
  more during the term thereof (provided that in the case of agreements or
  contracts with any customer, the margins anticipated from any such
  agreement or contract shall be consistent in all material respects with
  historical margins); enter into or amend any other agreement or contract
  material to the Company and its subsidiaries, taken as a whole; or purchase
  any real property, or make or agree to make any new capital expenditure or
  expenditures (other than the purchase of real property) which in the
  aggregate are in excess of $100,000;

     (q) the Company shall not, and shall not permit any of its subsidiaries
  to, pay, discharge or satisfy any claims, liabilities or obligations
  (absolute, accrued, asserted or unasserted, contingent or otherwise), other
  than the payment, discharge or satisfaction of any such claims, liabilities
  or obligations, in the ordinary course of business consistent with past
  practice or in accordance with their terms; and

     (r) the Company shall not, and shall not permit any of its subsidiaries
  to, authorize, recommend, propose or announce an intention to do any of the
  foregoing, or enter into any contract, agreement, commitment or arrangement
  to do any of the foregoing.

   No Solicitation. The Company shall not, nor shall it permit any of its
subsidiaries to, nor shall it authorize or permit any officer, director or
employee of or any financial advisor, attorney or other advisor or
representative of, the Company or any of its subsidiaries to, (i) solicit,
initiate or encourage the submission of, any Takeover Proposal (as defined
below), (ii) enter into any agreement with respect to or approve or recommend
any Takeover Proposal or (iii) participate in any discussions or negotiations
regarding, or furnish to any person any information with respect to the
Company or any subsidiary in connection with, or take any other action to
facilitate any inquiries or the making of any proposal that constitutes, or
may reasonably be expected to lead to, any Takeover Proposal; provided,
however, that prior to the acceptance for payment of Shares pursuant to the
Offer, if the Board of Directors of the Company reasonably determines that a
Takeover Proposal constitutes a Superior

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Proposal (as defined below), then, to the extent required by the fiduciary
obligations of the Board of Directors of the Company, as determined in good
faith by a majority thereof after consultation with independent counsel, the
Company may, in response to an unsolicited request therefor, and subject to
compliance with the Merger Agreement, furnish information with respect to the
Company and its subsidiaries to any person pursuant to a customary
confidentiality statement (as determined by the Company's independent counsel)
and participate in discussions or negotiations with such person. For purposes
of the Merger Agreement, "Takeover Proposal" means any proposal for (i) a
merger or other business combination involving the Company or any of its
subsidiaries, (ii) any proposal or offer to acquire in any manner, directly or
indirectly, an equity interest in or any voting securities of the Company
representing 15% or more of the Shares or of the total voting securities of
the Company outstanding or (iii) an offer to acquire in any manner, directly
or indirectly, a substantial portion of the assets of the Company or any of
its subsidiaries, other than the transactions contemplated by the Merger
Agreement, and "Superior Proposal" means a bona fide proposal made by a third
party to acquire the Company pursuant to a tender or exchange offer, a merger,
a sale of all or substantially all of the Company's assets or otherwise on
terms which a majority of the disinterested members of the Board of Directors
of the Company determines, at a duly constituted meeting of the Board of
Directors or by unanimous written consent, in its reasonable good faith
judgment to be more favorable to the Company's stockholders than the Merger
(based on the advice of the Company's independent financial advisor that the
value of the consideration provided for in such proposal exceeds the value of
the consideration provided for in the Merger) and for which financing, to the
extent required, is then committed or which, in the reasonable good faith
judgment of a majority of such disinterested members, as expressed in a
resolution adopted at a duly constituted meeting of such members (based on the
advice of the Company's independent financial advisor), is reasonably capable
of being obtained by such third party.

   The Merger Agreement provides further that, the Company must advise Parent
orally and in writing of (i) any Takeover Proposal or any inquiry with respect
to or which could lead to any Takeover Proposal received by any officer or
director of the Company or, to the knowledge of the Company, any financial
advisor, attorney or other advisor or representative of the Company, (ii) the
material terms of such Takeover Proposal (including a copy of any written
proposal), and (iii) the identity of the person making any such Takeover
Proposal or inquiry no later than 48 hours following receipt of such Takeover
Proposal or inquiry. If the Company intends to furnish any person with any
information with respect to any Takeover Proposal, the Company is required to
advise Parent orally and in writing of such intention not less than two
business days in advance of providing such information. The Company is further
required to keep Parent fully informed of the status and material terms of any
such Takeover Proposal or inquiry.

   Third Party Standstill Agreements. During the period from the date of the
Merger Agreement through the Effective Time, the Company has agreed not to
terminate, amend, modify or waive any provision of any confidentiality or
standstill agreement to which the Company or any of its subsidiaries is a
party (other than any involving Parent). The Company has also agreed to
enforce, to the fullest extent permitted under applicable law, the provisions
of any such agreements, including, but not limited to, obtaining injunctions
to prevent any breaches of such agreements and to enforce specifically the
terms and provisions thereof in any court of the United States or any state
thereof having jurisdiction.

   Stock Based Compensation. Prior to the consummation of the Offer, the Board
of Directors of the Company (or, if appropriate, any committee thereof) shall
adopt appropriate resolutions and take all other actions necessary or
appropriate to cause each option to purchase Shares that was outstanding as of
the consummation of the Offer to vest in full and to become exercisable
immediately prior to the consummation of the Offer with respect to all of the
shares of the Company's Common Stock at the time subject to such option to
purchase Shares. Each option to purchase Shares that is outstanding upon the
consummation of the Offer shall be canceled as of the consummation of the
Offer, in consideration for which, each holder of an option to purchase Shares
will be entitled to receive from the Company an amount equal to (A) the
product of (1) the number of Shares subject to such option and (2) the excess,
if any, of the Offer Price over the exercise price per share for the purchase
of Shares subject to such option, minus (B) all applicable federal, state and
local taxes required to be withheld in

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respect of such payment. The amounts payable pursuant to the Merger Agreement
(as described in the second sentence of this paragraph) will be paid as soon
as reasonably practicable following the acceptance for payment by the
Purchaser pursuant to the Offer. The surrender of an option in exchange for
the consideration contemplated in the Merger Agreement (as described in the
second sentence of this paragraph) shall be deemed a release of any and all
rights the holder of the option had or may have had in respect thereof.

   Pursuant to the Merger Agreement, the Company will take all actions
necessary to ensure that the Purchase Period (as defined in the Stock Purchase
Plan) applicable to the options outstanding under the Stock Purchase Plan is
shortened so as to have a Purchase Date (as defined in the Stock Purchase
Plan) that occurs before the acceptance for payment by the Purchaser of Shares
pursuant to the Offer; and no current holder of an option to purchase Shares
under the Stock Purchase Plan is permitted to increase his or her rate of
payroll deduction under the Stock Purchase Plan from and after the date of the
Merger Agreement.

   The Company has also agreed to take all actions necessary to provide that,
effective as of acceptance for payment by the Purchaser of Shares pursuant to
the Offer, the Company Stock Option Plan and any similar plan or agreement of
the Company will be terminated, any rights under any other plan, program,
agreement or arrangement relating to the issuance or grant of any other
interest in respect of the capital stock of the Company or any of its
subsidiaries will be terminated, and no holder of an option to purchase Shares
will have any right to receive any shares of capital stock of the Company or,
if applicable, the Surviving Corporation, upon exercise of any Company Stock
Option.

   Warrants. Prior to the consummation of the Offer, the Company will take all
actions necessary or appropriate to cause the warrant dated September 30,
1998, issued to Arthur A. Pilla and the warrant dated October 9, 1998, issued
to Alessandro Chiabrera to, after the Effective Time of the Merger, represent
the right to receive an amount equal to (A) the product of (1) the number of
shares of Company's Common Stock subject to such Warrant and (2) the excess,
if any, of the Merger Consideration over the Exercise Price (as defined in
such Warrant) per share for the purchase of the Company Common Stock subject
to such Warrant, minus (B) all applicable federal, state and local Taxes
required to be withheld in respect of such payment.

   Indemnification. Pursuant to the Merger Agreement, Parent and the Purchaser
agreed that from and after the Effective Time, Parent will cause the Surviving
Corporation to indemnify and hold harmless all past and present officers and
directors of the Company and of its subsidiaries to the same extent and in the
same manner such persons are indemnified as of the date of the Merger
Agreement by the Company pursuant to the DGCL, the Charter or the Company's
By-laws for acts or omissions occurring at or prior to the Effective Time.

   Parent has also agreed to cause the Surviving Corporation to provide, for a
period of not less than six years from the Effective Time, the Company's
current directors and officers an insurance and indemnification policy that
provides coverage for events occurring prior to the Effective Time that is
substantially similar to the Company's existing policy or, if substantially
equivalent insurance coverage is unavailable, the best available coverage;
provided, however, that the Surviving Corporation will not be required to pay
an annual premium for the director's and officer's insurance in excess of 150%
of the last annual premium paid prior to the date of the Merger Agreement but
in such case will purchase as much coverage as possible for such amount.

   Board Representation. The Merger Agreement provides that promptly after
such time as the Purchaser acquires Shares pursuant to the Offer, the
Purchaser will be entitled to designate at its option up to that number of
directors of the Company's Board of Directors, subject to compliance with
Section 14(f) of the Exchange Act, as will make the percentage of the
Company's directors designated by the Purchaser equal to the percentage of the
aggregate voting power of the Shares held by Parent or any of its
subsidiaries, and the Company shall at such time cause the Purchaser's
designees to be so elected by its existing Board of Directors. However, in the
event that the Purchaser's designees are elected to the Board of Directors of
the Company, until the Effective Time, such Board of Directors shall have at
least three directors who are directors on the date of the Merger Agreement
and who are not officers of the Company (the "Independent Directors"). If the
number of Independent Directors shall be reduced below three for any reason
whatsoever, the remaining Independent

                                       7
<PAGE>

Directors shall designate a person or persons to fill such vacancy each of
whom shall be deemed to be an Independent Director for purposes of the Merger
Agreement or, if no Independent Directors then remain, the other directors of
the Company as of the date of the Merger Agreement shall designate three
persons to fill such vacancies who shall not be officers or affiliates of the
Company or any of its subsidiaries, or officers or affiliates of Parent or any
of its subsidiaries, and such persons shall be deemed to be Independent
Directors for purposes of the Merger Agreement. In connection with the
foregoing, the Company will promptly, at the option of Parent, either increase
the size of the Company's Board of Directors and/or obtain the resignation of
such number of its current directors as is necessary to enable the Purchaser's
designees to be elected or appointed to the Company's Board of Directors as
provided above.

   Conditions Precedent. The respective obligations of each party to effect
the Merger shall be subject to the satisfaction (or waiver by each party)
prior to the Effective Time of the following conditions: (i) the Merger
Agreement (including the Merger) shall have been approved and adopted by the
affirmative vote of the stockholders of the Company (unless the vote of
stockholders is not required under the DGCL and the Company's Charter); (ii)
any waiting period (and any extension thereof) applicable to the consummation
of the Merger under the HSR Act or any other waiting periods under any
applicable foreign laws shall have expired or been terminated; (iii) the
Purchaser shall have previously accepted for payment and paid for Shares
pursuant to the Offer, except that this condition shall not apply if the
Purchaser shall have failed to purchase Shares pursuant to the Offer in breach
of its obligations under this Agreement; and (iv) no court or other
Governmental Entity (as defined in the Merger Agreement) having jurisdiction
over the Company or Parent or any of their respective subsidiaries shall have
enacted, issued, promulgated, enforced or entered any law, rule, regulation,
executive order, decree, injunction or other order (whether temporary,
preliminary or permanent) which is then in effect and has the effect of making
the merger illegal.

   Termination. The Merger Agreement provides that it may be terminated at any
time prior to the Effective Time, whether before or after the approval of the
terms of the Merger Agreement by the stockholders of the Company: (a) by
mutual written consent of Parent and the Company; (b) by either Parent or the
Company: (i) if (x) as a result of the failure of any of the conditions to the
Offer as set forth in the Offer to Purchase, the Offer shall have terminated
or expired in accordance with its terms without the Purchaser having accepted
for payment any Shares pursuant to the Offer or (y) the Purchaser shall not
have accepted for payment any Shares pursuant to the Offer prior to October
31, 1999 (provided that the right to terminate the Merger Agreement pursuant
to this clause (b)(i) shall not be available to any party whose failure to
perform any of its obligations under the Merger Agreement results in the
failure of any such condition to the Offer or if the failure of such condition
results from facts or circumstances that constitute a breach of any
representation or warranty under the Merger Agreement by such party) or (ii)
if any Governmental Entity shall have issued an order, decree or ruling or
taken any other action permanently enjoining, restraining or otherwise
prohibiting the acceptance for payment of, or payment for, Shares pursuant to
the Offer and such order, decree or ruling or other action shall have become
final and nonappealable; (c) by Parent or the Purchaser prior to the purchase
of Shares pursuant to the Offer in the event of a breach by the Company of any
representation, warranty, covenant or other agreement contained in the Merger
Agreement which (i) would give rise to the failure of condition (e) or (f)
described in the Offer to Purchase and (ii) cannot be or has not been cured
within 30 days after the giving of written notice to the Company; (d) by
Parent or the Purchaser if either Parent or the Purchaser is entitled to
terminate the Offer as a result of the occurrence of any event set forth in
paragraph (d) described in the Offer to Purchase; (e) by the Company if the
Board of Directors of the Company reasonably determines that a Takeover
Proposal constitutes a Superior Proposal and a majority of the Board of
Directors of the Company determines in its reasonable good faith judgment,
after consultation with outside counsel, that failing to terminate the Merger
Agreement would constitute a breach of its fiduciary duties under applicable
law; provided, that it has complied with the notice and other provisions of
the Merger Agreement and it complies with requirements of the Merger Agreement
relating to payment of Expenses and the Termination Fee (each as defined below
under "Fees and Expenses"); and provided further that the Company may not
terminate the Merger Agreement pursuant to this clause (e) unless and until 72
hours have elapsed following the delivery to Parent of a written notice of
such determination by the Board of Directors of the Company; (f) by the
Company, if (i) any of the representations or warranties of Parent

                                       8
<PAGE>

or the Purchaser set forth in the Merger Agreement that are qualified as to
materiality shall not be true and correct in any respect or any such
representations or warranties that are not so qualified shall not be true and
correct in any material respect or (ii) Parent or the Purchaser shall have
failed to perform in any material respect any material obligation or to comply
in any material respect with any material agreement or covenant of Parent or
the Purchaser to be performed or complied with by it under the Merger
Agreement and such untruth, incorrectness or failure cannot be or has not been
cured within 30 days after the giving of written notice to Parent or the
Purchaser, as applicable; or (g) by the Company, if the Offer has not been
timely commenced. In the event of a termination of the Merger Agreement by
either the Company or Parent, the Merger Agreement shall become void (except
for certain specified provisions, including those pertaining to the payment of
certain expenses and fees and except for certain confidentiality obligations
of the parties) and there shall be no liability or obligation on the part of
Parent, the Purchaser or the Company or their respective officers or
directors, other than for liability for any breach of a representation or
warranty contained in the Merger Agreement, the breach of any covenant
contained in the Merger Agreement or for fraud.

   Fees and Expenses. Except as provided in the Merger Agreement, whether or
not the Merger is consummated, all costs and expenses incurred in connection
with the Offer, the Merger and the Merger Agreement and the transactions
contemplated thereby shall be paid by the party incurring such costs and
expenses.

   The Merger Agreement provides that the Company will pay, or cause to be
paid, in same day funds to Parent the following amounts under the
circumstances and at the times set forth as follows: (i) if Parent or the
Purchaser terminates the Merger Agreement in accordance with the provisions
described in clause (d) under "Termination" above, the Company shall pay the
Expenses of Parent and a $2.5 million termination fee (the "Termination Fee")
upon demand; or (ii) if the Company terminates the Merger Agreement in
accordance with the provision described in clause (e) under "Termination"
above, the Company shall pay the Termination Fee within one business day
following such termination and the Expenses of Parent upon demand.

   For purposes of the Merger Agreement, "Expenses" means, documented out-of-
pocket fees and expenses incurred or paid by or on behalf of Parent, in
connection with the Offer, the Merger or the consummation of any of the
transactions contemplated by the Merger Agreement, including all fees and
expenses of law firms, commercial banks, investment banking firms,
accountants, experts and consultants to Parent.

The Stockholder Agreements

   The following summary of the stockholder agreements, by and among Parent,
Purchaser and each director of the Company (the "Stockholder Agreements") is
qualified in its entirety by reference to the Stockholder Agreements, copies
of which are filed as exhibits hereto. The Stockholder Agreements should be
read in their entirety for a more complete description of the matters
summarized below. Capitalized terms used below and not otherwise defined shall
have the meanings assigned to them in the Stockholder Agreements.

 The Stockholder Agreements

   Pursuant to the Stockholder Agreements, each Tendering Stockholder has
agreed that, (a) such Tendering Stockholder shall vote the Shares held by such
Tendering Stockholder in favor of the Merger and the Merger Agreement; (b)
such Tendering Stockholder shall vote his Shares against (i) any other merger
agreement or merger, consolidation, combination, sale of substantial assets,
reorganization, recapitalization, dissolution, liquidation or winding up of or
by the Company or any other Takeover Proposal or (ii) any amendment of the
Company's Charter or By-laws or other proposal or transaction involving the
Company or any of its subsidiaries, which amendment or other proposal or
transaction would in any manner impede, frustrate, prevent or nullify the
Merger, the Merger Agreement or any of the other transactions contemplated by
the Merger Agreement; (c) such Tendering Stockholder shall not (i) sell,
transfer, pledge, assign or otherwise dispose of, or enter into any contract,
option or other arrangement (including any profit sharing arrangement) with
respect to the sale, transfer, pledge, assignment or other disposition of,
their Shares to any person other than the Purchaser or the Purchaser's

                                       9
<PAGE>

designee or (ii) enter into any voting arrangement, whether by proxy, voting
agreement or otherwise, in connection, directly or indirectly, with any
Takeover Proposal; (d) such Tendering Stockholder shall not, and shall not
permit any investment banker, attorney or other adviser or representative of
such Tendering Stockholder to, (i) directly or indirectly solicit, initiate or
encourage the submission of, any Takeover Proposal or (ii) directly or
indirectly participate in any discussions or negotiations regarding, or
furnish to any person any information with respect to, or take any other
action to facilitate any inquiries or the making of any proposal that
constitutes, or may reasonably be expected to lead to, any Takeover Proposal;
and (e) the Tendering Stockholder shall tender pursuant to the Offer and not
withdraw the Shares owned by such Tendering Stockholder. The Stockholder
Agreements terminate upon the earlier of (i) the Effective Time and (ii) the
termination of the Merger Agreement in accordance with its terms.

Item 4. The Solicitation or Recommendation.

 Recommendation of the Board of Directors

   The Company's Board of Directors has unanimously approved the Merger
Agreement and determined that the Offer and the Merger are fair to and in the
best interests of the stockholders of the Company and recommends that all
stockholders of the Company accept the Offer and tender all their Shares
pursuant to the Offer. This recommendation is based in part upon an opinion,
dated July 25, 1999, received by the Company from U.S. Bancorp Piper Jaffray
that, as of such date, the proposed cash consideration to be received by the
Company's stockholders in the Offer and the Merger is fair to the stockholders
(other than Purchaser, Parent and their affiliates) from a financial point of
view. The full text of the opinion received by the Company from U.S. Bancorp
Piper Jaffray is filed as Exhibit 3 to this Schedule 14D-9 and is also
attached hereto as Annex A. Stockholders are urged to read such opinion in its
entirety.

   As set forth in the Offer Documents, Purchaser will purchase Shares
tendered prior to the close of the Offer if there shall have been validly
tendered and not withdrawn such number of Shares that together with the Shares
currently held by Holdings would constitute a majority of the Shares
outstanding on a fully diluted basis, assuming the exercise of all options to
purchase Shares, other than the Parent Option, and the conversion or exchange
of all securities convertible or exchangeable into Shares (the "Minimum
Condition") by that time and if all other conditions to the Offer have been
satisfied (or waived). Stockholders considering not tendering their Shares in
order to wait for the Merger should note that if the Minimum Condition is not
satisfied or any of the other conditions to the Offer are not satisfied,
Purchaser is not obligated to purchase any Shares, and can terminate the Offer
and the Merger Agreement and not proceed with the Merger. Under the DGCL, the
approval of the Company's Board of Directors and the affirmative vote of the
holders of a majority of the outstanding Shares are required to approve the
Merger. Accordingly, if the Minimum Condition is satisfied, Purchaser will
have sufficient voting power to cause the approval of the Merger without the
affirmative vote of any other stockholder. Further, under the DGCL, if
Purchaser acquires at least 90% of the outstanding shares, Purchaser will be
able to approve the Merger without a vote of the Company's stockholders.

   The Offer is scheduled to expire at 12:00 Midnight, New York City time, on
August 26, 1999, unless Parent, in its sole discretion, elects to extend the
period of time for which the Offer is open. A copy of the press release issued
by the Company and Parent on July 26, 1999 announcing the Merger and the Offer
is filed as Exhibit 4 to this Schedule 14D-9 and is incorporated herein by
reference in its entirety.

 Background of the Offer

   In September 1997, Parent and the Company commenced discussions concerning
cooperative business opportunities. These discussions resulted in the Company
entering into a number of agreements with Parent on August 10, 1998. These
agreements generally relate to (i) the right to market the Company's products
by Parent in the United States, (ii) the purchase of Shares and the grant of a
right to Parent to purchase additional Shares, (iii) rights granted to Parent
with respect to future distribution arrangements in countries other than the
United States and (iv) the non-exclusive right to negotiate with the Company
with regard to any strategic transaction

                                      10
<PAGE>

that the Company might consider. The maximum amount payable to the Company by
Parent under these agreements (excluding the amount paid for Shares purchased
by Holdings, as described below) is $6 million. In addition, pursuant to
certain of the agreements, the Company paid to Parent commissions of
$1,156,643 and $2,019,283 for the period from August 10, 1998 (when these
agreements became effective) to December 31, 1998 and the first six months of
1999, respectively. Under the agreements, the Company must notify Parent if,
at any time prior to August 1, 2008, the Company desires to enter into an
agreement of any kind with respect to, or in connection with, (i) the
Company's ultrasound or mechanical-stress therapies, or new applications of
such therapies, or (ii) a merger, a sale of substantially all of the Company's
assets, or other similar transaction. Parent then has the non-exclusive right
to negotiate with the Company for a period of 45 days, during which time the
Company may not execute a letter of intent or definitive agreement with any
other party.

   In connection with the August 1998 transaction, Holdings entered into a
stock purchase agreement with the Company pursuant to which it purchased
820,000 Shares for an aggregate purchase price of $4.1 million. Holdings and
the Company also entered into a registration rights agreement with respect to
the Shares. The Company also granted to Parent an option (the "Parent Option")
to purchase Shares representing up to 19% (including the Shares already
acquired by Holdings) of the outstanding Shares for a price per Share based
upon the fair market value of the Shares at the time of exercise. Parent may
exercise this option only if it exercises it right to enter into a worldwide
distribution agreement with the Company.

   In October 1998, the Company engaged U.S. Bancorp Piper Jaffray as its
financial adviser to assist the Company in evaluating various strategic
alternatives with the objective of maximizing stockholder value.

   At the Company's Board of Directors meeting on February 25, 1999, U.S.
Bancorp Piper Jaffray presented to the Company's Board of Directors and
management the results of its analysis and the Board discussed these results
in detail.

   As contemplated by the agreements signed in August 1998, in December 1998,
Parent and the Company entered into negotiations with respect to a
distribution agreement pursuant to which S&N or its affiliates would be the
exclusive distributor for the sale and promotion of the Company's Sonic
Accelerated Fracture Healing System in the United Kingdom. On April 9, 1999,
Parent and the Company entered into a United Kingdom Distribution Agreement in
furtherance of their existing sales and marketing relationship.

   On March 29, 1999, while attending a sales and reimbursement review meeting
at Parent's headquarters in Memphis, Tennessee, Mr. Patrick A. McBrayer,
President and Chief Executive Officer of the Company and Mr. Richard H.
Reisner, Vice President and Chief Financial Officer of the Company, met with
Mr. Larry Papasan, President of the Orthopedic Division of Parent. At that
meeting Mr. McBrayer indicated to Mr. Papasan that the Company's Board of
Directors had provided direction to Mr. McBrayer to seek to establish
strategic relationships for certain new applications of the Company's
ultrasound technology and to consider a possible acquisition of the Company.

   In anticipation of sending a formal notice pursuant to Parent's right of
first negotiation described above, Mr. Reisner provided Mr. David Evans, Group
Director, Business and Technical Support of the Orthopedic Division of Parent,
on March 31, 1999 with certain financial information regarding the Company.

   On April 5, 1999, Mr. McBrayer wrote a letter to the Board updating them as
to the status of his efforts with respect to seeking strategic partnerships
and on April 20, 1999, he sent a letter (the "Notice") to Parent, on behalf of
the Company, formally notifying Parent of the Company's intention to seek
partners for certain new applications of the Company's ultrasound technology
and for a possible business combination.

   In reaction to the Notice and in order to evaluate a possible transaction
with the Company, Mr. Papasan reviewed a preliminary valuation of the Company
prepared by Parent with the Group Executive Committee of S&N (the "S&N
Executive Committee") on April 26, 1999. After considering this valuation, the
members of

                                      11
<PAGE>

the S&N Executive Committee instructed Mr. Papasan to continue discussions
with the Company. As a result, on April 29, 1999, Mr. Papasan sent a letter to
Mr. McBrayer notifying him of Parent's intent to exercise its right of first
negotiation with the Company with respect to possible partnering relationships
or a potential acquisition, thus triggering a period through June 15, 1999
during which the Company could not enter into a strategic alliance or
acquisition agreement with any other third party.

   On May 18, 1999, Mr. Peter Huntley, Group Director, Business Development of
S&N, Mr. Evans and certain other officers of Parent, along with
representatives of Chase Securities Inc. ("Chase"), Parent's financial
advisor, met with members of senior management of the Company, including Mr.
McBrayer and Mr. Reisner, and U.S. Bancorp Piper Jaffray, the Company's
financial advisor, to discuss the Company's financial performance and business
prospects. Based upon this information and preliminary due diligence conducted
after that meeting, Parent entered into a Confidentiality Agreement (the
"Confidentiality Agreement") with the Company on June 2, 1999 to enable Parent
to conduct a financial, legal, operational and scientific due diligence
investigation in order to decide whether to seek a business combination with
the Company. After the execution of the Confidentiality Agreement, Parent
continued its due diligence.

   On June 8, 1999, Parent indicated to U.S. Bancorp Piper Jaffray that it
would consider a possible business combination with the Company, subject to a
number of conditions, including the approval of the Board of Directors of S&N
and satisfactory due diligence results. Parent also communicated its
preliminary valuation of the Company. A special telephonic meeting of the
Company's Board of Directors was held on June 11, 1999 to discuss this
valuation and the status of discussions with Parent. In addition to all of the
members of the Board, Mr. Reisner and representatives of U.S. Bancorp Piper
Jaffray and Brobeck, Phleger & Harrison LLP, the Company's counsel
("Brobeck"), were present. Mr. McBrayer updated the directors on the status of
discussions with Parent, including its proposal to structure an acquisition as
a cash tender offer, the valuation proposed, and the fact that the 45-day non-
exclusive right of negotiation period would expire on June 15, 1999. The
directors discussed the proposal at length and instructed Mr. McBrayer to
inform Parent that its proposed valuation would not be acceptable to the
Company's Board of Directors. The directors acknowledged, however, that
negotiations and due diligence were proceeding in good faith and agreed to
have the Company enter into an exclusive non-solicitation agreement with
Parent.

   Mr. Papasan and Mr. McBrayer spoke on June 17, 1999 to discuss Parent's
initial proposed valuation of the Company. Mr. McBrayer indicated that the
Company could not accept this valuation. Discussions regarding the appropriate
valuation of the Company continued on June 18, 1999 between Chase and U.S.
Bancorp Piper Jaffray and Mr. Papasan and Mr. McBrayer.

   On June 24, 1999, after further reviewing the Company's financial results
and business prospects with Parent, Chase contacted U.S. Bancorp Piper Jaffray
to indicate that Parent would value the Company at $5.15 per Share, subject to
the previously communicated conditions. A special telephonic meeting of the
Company's Board of Directors was held on June 28, 1999. In addition to a
majority of the members of the Board, Mr. Reisner and representatives of U.S.
Bancorp Piper Jaffray and Brobeck participated. Mr. McBrayer updated the Board
on the current status of negotiations and due diligence by the Parent, the
proposed cash purchase price of $5.15 per share and Parent's request for an
extension of the Company's non-solicitation agreement. After lengthy
discussion, the Board of Directors authorized Mr. McBrayer, on behalf of the
Company, to extend the non-solicitation period through July 26, 1999. The
Company's financial advisors responded on June 29, 1999 and indicated that the
Company would be willing to consider a business combination at the proposed
price. Parent and the Company then amended the Confidentiality Agreement to
extend the exclusivity period (which had expired on June 9, 1999) to July 26,
1999.

   On July 2, 1999, Mr. Papasan and Mr. McBrayer discussed key due diligence
issues, a schedule for completing due diligence and arrangements for
manufacturing and quality assurance audits of the Company to be performed by
Parent.


                                      12
<PAGE>

   On July 7, 1999, management of S&N circulated a paper to the Board of
Directors of S&N indicating its preliminary recommendation of an acquisition
of the Company, subject to the completion of satisfactory due diligence and
the negotiation of satisfactory legal documentation.

   On July 22, 1999, the Company's Board of Directors held a regularly
scheduled meeting at which all directors were present. Mr. Reisner and
representatives of U.S. Bancorp Piper Jaffray and Brobeck were also present.
The directors reviewed in detail with counsel drafts of the Merger Agreement,
a form of the Stockholder Agreements and a proposed amendment to the Rights
Plan. Representatives of U.S. Bancorp Piper Jaffray delivered a presentation
regarding financial analyses it had undertaken based upon the proposed
consideration to be received in the Merger.

   On July 25, 1999, the Company's Board of Directors held a telephonic
meeting with all members present. Mr. Reisner and representatives of U.S.
Bancorp Piper Jaffray and Brobeck also attended the meeting. U.S. Bancorp
Piper Jaffray updated the Board as to certain aspects of its July 22
presentation, and rendered to the Board its oral opinion (which opinion was
subsequently confirmed by delivery of a written opinion dated July 25, 1999)
as to the fairness, from a financial point of view, of the cash consideration
to be received in the Offer and Merger by the holders (other than Purchaser,
Parent and their affiliates) of Shares. The Company's Board of Directors then
unanimously (i) determined that the Merger Agreement was fair and in the best
interests of the stockholders of the Company, (ii) declared the Merger
Agreement and the transactions contemplated thereby to be advisable and in the
best interests of the stockholders of the Company, (iii) approved the Merger
Agreement and the transactions contemplated thereby, including the Second
Amendment to the Rights Agreement, and (iv) recommended that the holders of
Shares accept the Offer, tender their Shares pursuant to the Offer and approve
and adopt the Merger Agreement and the transactions contemplated thereby.

   On July 25, 1999, all necessary responses from the Board of Directors of
S&N had been received and a board resolution approving the transaction was
passed authorizing the Banking & Finance Committee of S&N to effect the
transaction. On the afternoon of July 25, 1999, the Banking & Finance
Committee of S&N, after receiving a final due diligence report from certain
officers of Parent, also approved the Merger Agreement and the Stockholder
Agreements.

   On July 25, 1999, the Merger Agreement and the Stockholder Agreements were
signed and delivered by the respective parties thereto.

   On July 26, 1999, prior to the opening of stock trading, S&N, Parent and
the Company issued a press release announcing the transaction. On July 30,
1999, the Purchaser commenced the Offer.

 Reasons for the Recommendation.

   In reaching its conclusions described above, the Company's Board of
Directors considered a number of factors, including, without limitation, the
following:

     1. the financial and other terms and conditions of the Offer and the
  Merger Agreement;

     2. the fact that the $5.15 per Share price to be received by the
  Company's stockholders in both the Offer and the Merger represents a 19.42%
  premium over the closing market price of $4.3125 per Share on July 23,
  1999, the last full trading day prior to the approval of the Merger
  Agreement by the Company's Board of Directors, a premium of 111.28% over
  the closing market price of $2.4375 per share on June 25, 1999, the 20th
  full trading day prior to the approval of the Merger Agreement by the
  Company's Board of Directors, and a premium of 106.91% over the average
  closing prices for the 20 trading day period ending on July 23, 1999. The
  Board of Directors also considered the fact that such price would be
  payable in cash, thus eliminating any uncertainties in valuing the
  consideration to be received by the Company's stockholders;


                                      13
<PAGE>

     3. the opinion of U.S. Bancorp Piper Jaffray, dated July 25, 1999, that,
  as of such date, the proposed cash consideration to be received by the
  Company's stockholders pursuant to the Offer and the Merger was fair to
  such stockholders (other than Purchaser, Parent and their affiliates) from
  a financial point of view. A copy of U.S. Bancorp Piper Jaffray's written
  opinion is attached to this Schedule 14D-9 as Annex A and is incorporated
  herein by reference. You should read this opinion in its entirety for a
  description of the procedures followed, assumptions and qualifications
  made, matters considered and limitations of the review undertaken by U.S.
  Bancorp Piper Jaffray. In connection with delivering its opinion, U.S.
  Bancorp Piper Jaffray made a presentation to the Company's Board of
  Directors at meetings held on July 22 and July 25, 1999, as to various
  financial and other matters underlying such opinion including, among other
  things, (a) a review of the Company's historical and projected operating
  performance; (b) a review of the historical stock prices and trading
  volumes of the Shares; (c) a discounted cash flow analysis of the Company;
  (d) an analysis of the Offer Price as a multiple of various measures of the
  Company's operating performance; (e) a review of the public market value
  and trading multiples of selected publicly traded companies in the medical
  technology industry; (f) a review of selected transactions in the
  orthopaedic segment of the medical technology industry; and (g) a review of
  the premiums paid in the medical technology industry.

     4. the Company's business, financial condition, results of operations,
  assets, liabilities, business strategy and prospects on both an historical
  and a projected basis, as well as various uncertainties associated with
  those prospects, including (a) the technological risks involved in
  developing and commercializing the Company's cartilage, spine fusion and
  mechanical stress technologies and the amount of time and funding expected
  to be required for these projects, and (b) the risks associated with
  seeking and obtaining regulatory and reimbursement approval of the
  Company's current and future products;

     5. an analysis by the Board of Directors and senior management of the
  Company, with the assistance of U.S. Bancorp Piper Jaffray, of the various
  alternatives available to the Company regarding developing and
  commercializing each of its technologies, including conducting such
  activities on its own or through joint ventures or other agreements with
  one or more strategic partners;

     6. a review of the medical technology industry, particularly the
  companies that might be potential acquirors of the Company, as well as
  discussions held in the past with these companies;

     7. the depressed valuations of many medical technology companies,
  including the Company, in the public market and the potential cost to these
  companies to obtain additional capital;

     8. the current strategic relationship between the Company and Parent and
  the business and operational synergies that have been achieved in that
  relationship. The Board of Directors also considered the effect that this
  relationship could have on a competitor's analysis regarding an acquisition
  of the Company or a strategic relationship with the Company for one or more
  of its future technologies. The Board of Directors also considered the
  potential difficulty in managing multiple strategic relationships at the
  same time;

     9. the fact that the Offer and the Merger would not be subject to any
  financing condition and that Parent has represented that it has sufficient
  cash to acquire all of the Shares in the Offer and the Merger;

     10. the likelihood that the proposed Merger would be consummated,
  including the terms of the Merger Agreement related thereto and the
  reputation and experience of Parent;

     11. the fact that, to the extent required by the fiduciary obligations
  of the Company's Board of Directors to the stockholders under the DGCL, the
  Company may withdraw its recommendation with respect to the Offer and the
  Merger in order to approve a tender offer or exchange offer for the Shares
  or other proposed business combination by a third party on terms more
  favorable to the Company's stockholders than the Offer and the Merger taken
  together, such actions providing Parent the right to terminate the Merger
  Agreement and receive from the Company a $2.5 million termination fee plus
  Parent's actual expenses associated with the Offer and the Merger. See Item
  3. "Identity and Background--Merger Agreement--Termination" and "--Fees and
  Expenses."


                                      14
<PAGE>

In light of all the factors set forth above, the Board of Directors approved
the Offer and the Merger. In view of the variety of factors considered in
connection with its evaluation of the Offer and the Merger, the Board of
Directors did not assign relative weights to the specific factors considered
in reaching its decision.

Item 5. Persons Retained, Employed or to be Compensated.

   The Company retained U.S. Bancorp Piper Jaffray as its financial advisor in
connection with the Offer and the Merger. Pursuant to its agreements with the
Company, dated May 4, 1999, U.S. Bancorp Piper Jaffray will become entitled to
receive a fee of (i) 1.5% of the aggregate consideration paid to stockholders
in the Merger and (ii) $250,000 upon delivery of a fairness opinion (to be
credited against any fee otherwise payable under clause (i)). In addition,
$75,000, which was paid to U.S. Bancorp Piper Jaffray in connection with its
analysis of the Company's strategic alternatives in early 1999, will be
credited against any such fees due. The Company has agreed to reimburse U.S.
Bancorp Piper Jaffray monthly for its reasonable out-of-pocket expenses
incurred in connection with the Merger. The Company has also agreed to
indemnify U.S. Bancorp Piper Jaffray, its directors, officers, employees,
agents, and each person, if any, controlling U.S. Bancorp Piper Jaffray or any
of its affiliates against certain liabilities (and certain related expenses)
relating to or arising out of its engagement.

   Except as set forth above, neither the Company nor any person acting on its
behalf has or currently intends to employ, retain or compensate any person to
make solicitations or recommendations to the stockholders of the Company on
its behalf with respect to the Offer and the Merger.

Item 6. Recent Transactions and Intent with Respect to Securities.

   (a) During the past sixty days, no transactions in the Shares have been
effected by the Company or, to the best of the Company's knowledge, by any
executive officer, director, affiliate, or subsidiary of the Company.

   (b) To the best knowledge of the Company, all of its executive officers and
directors currently intend to tender pursuant to the Offer all Shares held of
record or beneficially owned by them.

Item 7. Certain Negotiations and Transactions by the Subject Company.

   (a) Except as set forth herein, no negotiation is being undertaken or is
underway by the Company in response to the Offer which relates to or would
result in (i) an extraordinary transaction, such as a merger or
reorganization, involving the Company or any subsidiary thereof; (ii) a
purchase, sale or transfer of a material amount of assets by the Company or
any subsidiary thereof; (iii) a tender offer for or other acquisition of
securities by or of the Company; or (iv) any material change in the present
capitalization or dividend policy of the Company.

   (b) Except as set forth herein, there is no transaction, board resolution,
agreement in principle or signed contract in response to the Offer that
relates to or would result in one or more of the events referred to in Item
7(a) above.

Item 8. Additional Information to be Furnished.

Section 203.

   As a Delaware corporation, the Company is subject to Section 203 ("Section
203") of the DGCL. Section 203 would prevent an "Interested Stockholder"
(generally defined as a person beneficially owning 15% or more of a
corporation's voting stock) from engaging in a "Business Combination" (as
defined in Section 203) with a Delaware corporation for three years following
the date such person became an Interested Shareholder unless: (i) before such
person became an Interested Stockholder, the board of directors of the
corporation approved the transaction in which the Interested Stockholder
became an Interested Stockholder or approved the Business

                                      15
<PAGE>

Combination, (ii) upon consummation of the transaction which resulted in the
Interested Shareholder becoming an Interested Stockholder, the Interested
Stockholder owned at least 85% of the voting stock of the corporation
outstanding at the time the transaction commenced (excluding for purposes of
determining the number of shares of outstanding stock held by directors who
are also officers and by employee stock ownership plans that do not allow plan
participants to determine confidentially whether to tender shares), or (iii)
following the transaction in which such person became an Interested
Stockholder, the Business Combination is (x) approved by the board of
directors of the corporation and (y) authorized at a meeting of shareholders
by the affirmative vote of the holders of at least 66 2/3% of the outstanding
voting stock of the corporation not owned by the Interested Stockholder. In
accordance with the provisions of the Company's Certificate of Incorporation
and Section 203, the Board of Directors of the Company has approved the Merger
Agreement and the Stockholders Agreement and Purchaser's acquisition of Shares
pursuant to the Offer and the Merger and the transactions contemplated by the
Merger Agreement and, therefore, the restrictions of Section 203 are
inapplicable to the Merger, the Offer and the related transactions.

Antitrust.

   Under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended
("HSR Act") and the rules that have been promulgated thereunder by the Federal
Trade Commission (the "FTC"), certain acquisition transactions may not be
consummated unless certain information has been furnished to the Antitrust
Division of the United States Department of Justice (the "Antitrust Division")
and the FTC and certain waiting period requirements have been satisfied. The
acquisition of Shares by Purchaser pursuant to the Offer is subject to such
requirements.

   Pursuant to the requirements of the HSR Act, Parent intends to file the
required Notification and Report Forms (the "Forms") with the Antitrust
Division and the FTC on July 30, 1999, and the Company expects to file the
Forms with such agencies on July 30, 1999. The statutory waiting period
applicable to the purchase of Shares pursuant to the Offer is to expire at
11:59 P.M., Washington, D.C. time, on August 14, 1999. However, prior to such
date, the Antitrust Division or the FTC may extend the waiting periods by
requesting additional information or documentary material relevant to the
acquisition. If such a request is made, the waiting period will be extended
until at least 11:59 P.M., Washington, D.C. time, on the tenth day after
substantial compliance by Parent with such request. Thereafter, such waiting
periods can be extended only by court order. A request is being made pursuant
to the HSR Act for early termination of the applicable waiting period. There
can be no assurance, however, that the waiting period will be terminated
early. The Merger Agreement provides that, if by the expiration of the Offer,
the applicable waiting period under the HSR Act shall not have expired or been
terminated, Parent may, without the consent of the Company, extend the Offer
from time to time until the date that such waiting period has expired or been
terminated.

   The Antitrust Division and the FTC frequently scrutinize the legality under
the antitrust laws of transactions. At any time before or after the
consummation of any such transactions, the Antitrust Division or the FTC
could, notwithstanding termination of the waiting period, take such action
under the antitrust laws as it deems necessary or desirable in the public
interest, including seeking to enjoin the purchase of Shares pursuant to the
Offer or seeking divestiture of the Shares so acquired or divestiture of
substantial assets of Parent or the Company. Private parties may also bring
legal actions under the antitrust laws. There can be no assurance that a
challenge to the Offer on antitrust grounds will not be made, or if such a
challenge is made, what the result will be. See Item 3, "Identity and
Background--The Merger Agreement--Conditions Precedent."

   The Company and S&N plan to make a filing in Germany in order to consummate
the transactions contemplated by the Offer and the Merger, and if necessary or
desirable, may make similar filings in Australia, Japan and possibly other
countries.

                                      16
<PAGE>

Item 9. Material to be Filed as Exhibits.

<TABLE>
<CAPTION>
 Exhibit
 -------
 <C>     <S>
   1     Agreement and Plan of Merger dated as of July 25, 1999 among Parent,
         Purchaser and the Company
   2(a)  Stockholder Agreement, dated as of July 25, 1999, among Purchaser,
         Parent and John P. Ryaby.
   2(b)  Stockholder Agreement, dated as of July 25, 1999, among Purchaser,
         Parent and Buzz Benson.
   2(c)  Stockholder Agreement, dated as of July 25, 1999, among Purchaser,
         Parent and Donald J. Lothrop.
   2(d)  Stockholder Agreement, dated as of July 25, 1999, among Purchaser,
         Parent and Peter C. Madeja.
   2(e)  Stockholder Agreement, dated as of July 25, 1999, among Purchaser,
         Parent and David J. Ottensmeyer.
   2(f)  Stockholder Agreement, dated as of July 25, 1999, among Purchaser,
         Parent and Terence D. Wall.
   2(g)  Stockholder Agreement, dated as of July 25, 1999, among Purchaser,
         Parent and Patrick A. McBrayer.
   3     Opinion of U.S. Bancorp Piper Jaffray Inc., dated July 25, 1999
   4     Press Release of the Company dated July 26, 1999
   5     Letter dated July 30, 1999 from Patrick A. McBrayer to the
         stockholders of the Company (included with Schedule 14D-9 mailed to
         stockholders)
</TABLE>

                                       17
<PAGE>

                                   SIGNATURE

   After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.

July 30, 1999

EXOGEN, INC.

By: /s/ Patrick A. McBrayer
  ---------------------------
  President and Chief Executive
   Officer

                                      18
<PAGE>

                                                                         Annex A

The Board of Directors
Exogen, Inc.
10 Constitution Avenue
Piscataway, NJ  08855

Members of the Board:

You have requested our opinion as to the fairness, from a financial point of
view, to the holders of common stock (the "Common Stock") of Exogen, Inc.
("Exogen") of the proposed cash consideration to be paid pursuant to an
Agreement and Plan of Merger (the "Agreement"), among Smith & Nephew
Acquisition, Inc. ("Purchaser"), a wholly owned subsidiary of Smith & Nephew,
Inc., and Exogen.  Pursuant to the Agreement, Purchaser would make a cash tender
offer ("Tender Offer") for all of the outstanding Common Stock at a purchase
price of $5.15 per share.  Following completion of the Tender Offer, Purchaser
would be merged into Exogen (the "Merger") and each outstanding share of Common
Stock would be converted into the right to receive $5.15 in cash.  The terms and
conditions of the Tender Offer and Merger (collectively, the "Transaction") are
more fully set forth in the Agreement.

U.S. Bancorp Piper Jaffray Inc., as a customary part of its investment banking
business, is engaged in the valuation of businesses and their securities in
connection with mergers and acquisitions, underwriting and secondary
distributions of securities, private placements and valuations for estate,
corporate and other purposes. We have acted as exclusive financial advisor to
Exogen in connection with the Agreement and will receive a fee for our services
which is contingent upon consummation of the Agreement.  In addition, we will
receive a separate fee for providing this opinion.  This opinion fee is not
contingent upon the consummation of the Agreement. Exogen has also agreed to
indemnify us against certain liabilities in connection with our services. We
make a market in the Common Stock and provide research coverage for Exogen. We
acted as co-manager of the initial public offering of the Common Stock on July
20, 1995. In the ordinary course of our business, we and our affiliates may
actively trade securities of Exogen for our own account or the account of our
customers and, accordingly, may at any time hold a long or short position in
such securities.
<PAGE>

Exogen, Inc.
July 25, 1999
Page 2


In arriving at our opinion, we have undertaken such review, analyses and
inquiries as we deemed necessary and appropriate under the circumstances.  Among
other things, we have reviewed (i) a draft copy of the Agreement and Plan of
Merger dated July 25, 1999, (ii) certain financial, operating, business and
other information relative to Exogen, (iii) certain internal financial
information of Exogen on a stand-alone basis furnished by the management of
Exogen, (iv) to the extent publicly available, the stock price premiums paid and
financial terms of certain acquisition transactions involving companies
operating in industries in which Exogen operates and operating performance and
valuation analyses of selected public companies deemed comparable to Exogen, and
(v) certain publicly available market and securities data of Exogen. In
addition, we had discussions with members of the management of Exogen concerning
the financial condition, current operating results and business outlook for
Exogen on a stand-alone basis.

We have relied upon and assumed the accuracy, completeness and fairness of the
financial statements and other information provided to us by Exogen, or
otherwise made available to us, and have not assumed responsibility for the
independent verification of such information. We have relied upon the assurances
of the management of  Exogen that the information provided to us by Exogen has
been prepared on a reasonable basis, and, with respect to financial planning
data and other business outlook information, reflects the best currently
available estimates, and that they are not aware of any information or facts
that would make the information provided to us incomplete or misleading.

In arriving at our opinion, we have not performed any appraisals or valuations
of any specific assets or liabilities of Exogen, and have not been furnished
with any such appraisals or valuations.  We express no opinion regarding the
liquidation value of any entity.

This opinion is necessarily based upon the information available to us and facts
and circumstances as they exist and are subject to evaluation on the date
hereof; events occurring after the date hereof could materially affect the
assumptions used in preparing this opinion.  We are not expressing any opinion
herein as to the price at which shares of Common Stock have traded or may trade
at any future time.  We have not undertaken to reaffirm or revise this opinion
or otherwise comment upon any events occurring after the date hereof and do not
have any obligation to update, revise or reaffirm this opinion.
<PAGE>

Exogen, Inc.
July 25, 1999
Page 3


This opinion is directed to the Board of Directors of Exogen and is not intended
to be and does not constitute a recommendation to any shareholder. We were not
requested to opine as to, and this opinion does not address, the basic business
decision to proceed with or effect the Transaction. This opinion shall not be
published or otherwise used, nor shall any public references to us be made,
without our prior written approval.


Based upon and subject to the foregoing and based upon such other factors as we
consider

relevant, it is our opinion that the  $5.15 per share in cash proposed to be
received in the Transaction by the stockholders of Exogen (other than Purchaser,
Smith & Nephew and their affiliates) pursuant to such Agreement is fair, from a
financial point of view, to such stockholders as of the date hereof.

Sincerely,


U.S. BANCORP PIPER JAFFRAY INC.

<PAGE>


                                                                  Exhibit 1

                          AGREEMENT AND PLAN OF MERGER



                                     AMONG



                             SMITH & NEPHEW, INC.



                         SMITH & NEPHEW ACQUISITION, INC.



                                      AND



                                  EXOGEN, INC.



                           Dated as of July 25, 1999

<PAGE>

                               TABLE OF CONTENTS

                         AGREEMENT AND PLAN OF MERGER
<TABLE>
<CAPTION>
                                                                                  Page
<S>                                                                               <C>
ARTICLE I

     THE OFFER...................................................................... 2
     Section 1.1  The Offer......................................................... 2
     Section 1.2  Company Actions................................................... 3

ARTICLE II.......................................................................... 4

     THE MERGER..................................................................... 4
     Section 2.1  The Merger........................................................ 4
     Section 2.2  Effective Time.................................................... 5
     Section 2.3  Effects of the Merger............................................. 5
     Section 2.4  Charter and Bylaws; Directors and Officers........................ 5
     Section 2.5  Conversion of Securities.......................................... 5
     Section 2.6  Exchange of Certificates.......................................... 6
     Section 2.7  Merger Without Meeting of Stockholders............................ 8
     Section 2.8  Further Assurances................................................ 8
     Section 2.9  Closing........................................................... 9

ARTICLE III

     REPRESENTATIONS AND WARRANTIES OF PARENT AND SUB............................... 9
     Section 3.1  Organization...................................................... 9
     Section 3.2  Authority......................................................... 9
     Section 3.3  Consents and Approvals; No Violations.............................10
     Section 3.4  Information Supplied..............................................11
     Section 3.5  Ownership of Shares...............................................11
     Section 3.6  Interim Operations of Sub.........................................11
     Section 3.7  Brokers...........................................................11

ARTICLE IV

     REPRESENTATIONS AND WARRANTIES OF THE COMPANY
     Section 4.1  Organization, Standing and Power..................................12
     Section 4.2  Capital Structure.................................................12
     Section 4.3  Authority.........................................................14
     Section 4.4  Consents and Approvals; No Violation..............................14
     Section 4.5  SEC Documents and Other Reports...................................15
</TABLE>

                                      -i-
<PAGE>

<TABLE>
<CAPTION>

                                                                                  Page
                                                                                  ----
<S>                                                                               <C>
     Section 4.6   Information Supplied.............................................16
     Section 4.7   Absence of Certain Changes or Events.............................16
     Section 4.8   Permits and Compliance...........................................17
     Section 4.9   Tax Matters......................................................18
     Section 4.10  Actions and Proceedings..........................................19
     Section 4.11  Certain Agreements...............................................20
     Section 4.12  ERISA............................................................20
     Section 4.13  Compliance with Worker Safety Laws...............................22
     Section 4.14  Liabilities; Products............................................22
     Section 4.15  Labor Matters....................................................23
     Section 4.16  Intellectual Property; Year 2000.................................23
     Section 4.17  Title to Assets..................................................24
     Section 4.18  State Takeover Statutes; Rights Agreement........................25
     Section 4.19  Required Vote of Company Stockholders............................25
     Section 4.20  Accounts Receivable..............................................25
     Section 4.21  Inventories......................................................25
     Section 4.22  Environmental Matters............................................26
     Section 4.23  Suppliers, Customers and Employees...............................27
     Section 4.24  Insurance........................................................27
     Section 4.25  Transactions with Affiliates.....................................28
     Section 4.26  Brokers..........................................................28

ARTICLE V

     COVENANTS RELATING TO CONDUCT OF BUSINESS
     Section 5.1   Conduct of Business by the Company Pending the Merger............29
     Section 5.2   No Solicitation..................................................31
     Section 5.3   Third Party Standstill Agreements................................32

ARTICLE VI

     ADDITIONAL AGREEMENTS
     Section 6.1   Stockholder Meeting..............................................32
     Section 6.2   Access to Information............................................33
     Section 6.3   Directors........................................................33
     Section 6.4   Fees and Expenses................................................34
     Section 6.5   Company Stock Options............................................35
     Section 6.6   Warrants.........................................................35
     Section 6.7   Reasonable Best Efforts..........................................36
     Section 6.8   Public Announcements.............................................36
     Section 6.9   State Takeover Laws..............................................37
     Section 6.10  Indemnification; Directors and Officers Insurance................37
</TABLE>
                                     -ii-
<PAGE>

<TABLE>
<CAPTION>
                                                                                  Page
                                                                                  ----
<S>                                                                               <C>
     Section 6.11  Notification of Certain Matters..................................37

ARTICLE VII

     CONDITIONS PRECEDENT TO THE MERGER
     Section 7.1  Conditions to Each Party's Obligation to Effect the Merger........38

ARTICLE VIII

     TERMINATION, AMENDMENT AND WAIVER
     Section 8.1  Termination.......................................................38
     Section 8.2  Effect of Termination.............................................40
     Section 8.3  Amendment.........................................................40
     Section 8.4  Waiver............................................................40

ARTICLE IX

     GENERAL PROVISIONS
     Section 9.1  Non-Survival of Representations and Warranties....................40
     Section 9.2  Notices...........................................................40
     Section 9.3  Interpretation; Certain Definitions...............................41
     Section 9.4  Counterparts......................................................43
     Section 9.5  Entire Agreement; No Third-Party Beneficiaries....................43
     Section 9.6  Governing Law.....................................................44
     Section 9.7  Assignment........................................................44
     Section 9.8  Severability......................................................44
     Section 9.9  Enforcement of this Agreement.....................................44

EXHIBITS
- --------

A    Stockholder Agreement
B    Conditions of the Offer
C    Second Amendment to Rights Agreement
</TABLE>

                                     -iii-
<PAGE>

                         AGREEMENT AND PLAN OF MERGER
                         ----------------------------


          AGREEMENT AND PLAN OF MERGER, dated as of July 25, 1999 (this
"Agreement"), among Smith & Nephew, Inc., a Delaware corporation ("Parent"),
Smith & Nephew Acquisition, Inc., a Delaware corporation and a wholly-owned
subsidiary of Parent ("Sub"), and Exogen, Inc., a Delaware corporation (the
"Company") (Sub and the Company being hereinafter collectively referred to as
the "Constituent Corporations").


                             W I T N E S S E T H:


          WHEREAS, the respective Boards of Directors of Parent, Sub and the
Company have approved the acquisition of the Company by Parent on the terms and
subject to the conditions set forth herein;

          WHEREAS, in furtherance of such acquisition, Parent proposes to cause
Sub to make a tender offer (as it may be amended from time to time as permitted
under this Agreement, the "Offer") to purchase the shares of Common Stock, par
value $.0001 per share, of the Company (the "Company Common Stock"; the shares
of Company Common Stock, together with the Rights (as defined in Section 4.2)
associated therewith, being hereinafter collectively referred to as the
"Shares") at a purchase price of $5.15 per Share (the "Offer Price"), net to the
seller in cash, without interest thereon, upon the terms and subject to the
conditions set forth in this Agreement; and the Board of Directors of the
Company has adopted resolutions approving the Offer and the Merger (as defined
below) and recommending that holders of Shares accept the Offer and that the
Company's stockholders approve this Agreement;

          WHEREAS, the respective Boards of Directors of Parent, Sub and the
Company have approved and declared advisable the merger of Sub and the Company
(the "Merger"), upon the terms and subject to the conditions set forth herein,
whereby each issued and outstanding Share not owned directly or indirectly by
Parent, Smith & Nephew Holdings, Inc., a Delaware corporation ("Holdings"), or
the Company will be converted into the right to receive the price per share paid
in the Offer and the respective Boards of Directors of Sub and the Company have
approved and adopted this Agreement; and

          WHEREAS, in order to induce Parent and Sub to enter into this
Agreement, concurrently herewith Parent and certain of the stockholders of the
Company are entering into Stockholder Agreements dated as of the date hereof
(the "Stockholder Agreements") in the forms of the attached Exhibit A.

          NOW, THEREFORE, in consideration of the premises, representations,
warranties and agreements herein contained, the parties agree as follows:
<PAGE>

                                   ARTICLE I

                                   THE OFFER

          Section 1.1 The Offer. (a) Subject to the provisions of this
Agreement, as promptly as practicable but in no event later than July 30, 1999,
Sub shall, and Parent shall cause Sub to, commence, within the meaning of Rule
14d-2 under the Securities Exchange Act of 1934, as amended (together with the
rules and regulations thereunder, the "Exchange Act"), the Offer. The obligation
of Sub to, and of Parent to cause Sub to, commence the Offer and accept for
payment, and pay for, any Shares tendered pursuant to the Offer shall be subject
only to the conditions set forth in the attached Exhibit B (the "Offer
Conditions") (any of which may be waived in whole or in part by Sub in its sole
discretion, except that Sub shall not waive the Minimum Condition (as defined in
Exhibit B) without the consent of the Company) and subject to the rights of
Parent and Sub to terminate this Agreement as provided in Section 8.1. Sub
expressly reserves the right to modify the terms of the Offer, except that,
without the consent of the Company, Sub shall not (i) reduce the number of
Shares subject to the Offer, (ii) reduce the Offer Price, (iii) impose any other
conditions to the Offer other than the Offer Conditions or modify the Offer
Conditions (other than to waive any Offer Conditions to the extent permitted by
this Agreement), (iv) except as provided in the next sentence, extend the Offer
or (v) change the form of consideration payable in the Offer. Notwithstanding
the foregoing, Sub may, without the consent of the Company, (i) extend the
Offer, if at the scheduled or extended expiration date of the Offer any of the
Offer Conditions shall not be satisfied or waived, until such time as such
conditions are satisfied or waived, (ii) extend the Offer for any period
required by any rule, regulation, interpretation or position of the Securities
and Exchange Commission (the "SEC") or the staff thereof applicable to the Offer
and (iii) extend the Offer for any reason on one or more occasions for an
aggregate period of not more than 15 business days beyond the latest expiration
date that would otherwise be permitted under clause (i) or (ii) of this
sentence, in each case subject to the right of Parent, Sub or the Company to
terminate this Agreement pursuant to the terms hereof. Parent and Sub agree that
if at any scheduled expiration date of the Offer, the Minimum Condition, the HSR
Condition (as defined in Exhibit B) or either of the conditions set forth in
paragraphs (e) or (f) of Exhibit B shall not have been satisfied, but at such
scheduled expiration date all the conditions set forth in paragraphs (a), (b),
(c), (d), (g) and (h) of Exhibit B shall then be satisfied, at the request of
the Company (confirmed in writing), Sub shall extend the Offer from time to
time, subject to the right of Parent, Sub or the Company to terminate this
Agreement pursuant to the terms hereof. Subject to the terms and conditions of
the Offer and this Agreement, Sub shall, and Parent shall cause Sub to, accept
for payment, and pay for, all Shares validly tendered and not withdrawn pursuant
to the Offer that Sub becomes obligated to accept for payment, and pay for,
pursuant to the Offer as soon as practicable after the expiration of the Offer,
and in any event in compliance with the obligations respecting prompt payment
pursuant to Rule 14e-1(c) under the Exchange Act.

                                      -2-
<PAGE>

          (b)  On the date of commencement of the Offer, Parent and Sub shall
file with the SEC a Tender Offer Statement on Schedule 14D-1 (the "Schedule 14D-
1") with respect to the Offer, which shall contain an offer to purchase and a
related letter of transmittal and summary advertisement (such Schedule 14D-1 and
the documents included therein pursuant to which the Offer will be made,
together with any supplements or amendments thereto, the "Offer Documents"), and
Parent and Sub shall cause to be disseminated the Offer Documents to holders of
Shares as and to the extent required by applicable Federal securities laws.
Parent, Sub and the Company each agrees promptly to correct any information
provided by it for use in the Offer Documents if and to the extent that such
information shall have become false or misleading in any material respect, and
Parent and Sub further agree to take all steps necessary to cause the Schedule
14D-1 as so corrected to be filed with the SEC and the other Offer Documents as
so corrected to be disseminated to holders of Shares, in each case as and to the
extent required by applicable Federal securities laws. The Company and its
counsel shall be given reasonable opportunity to review and comment upon the
Offer Documents prior to their filing with the SEC or dissemination to the
stockholders of the Company. Parent and Sub agree to provide the Company and its
counsel any comments Parent, Sub or their counsel may receive from the SEC or
its staff with respect to the Offer Documents promptly after the receipt of such
comments and to cooperate with the Company and its counsel in responding to any
such comments.

          (c)  Parent shall provide or cause to be provided to Sub on a timely
basis the funds necessary to accept for payment, and pay for, any Shares that
Sub becomes obligated to accept for payment, and pay for, pursuant to the Offer.

          (d)  Parent or Sub shall engage an information agent in connection
with the Offer.

          Section 1.2  Company Actions. (a) The Company hereby approves of and
consents to the Offer and represents and warrants that the Board of Directors of
the Company, at a meeting duly called and held, at which all directors were
present (in person or by telephone), duly and unanimously adopted resolutions
approving and adopting this Agreement, approving the Offer and the Merger,
taking all action necessary to render the provisions of Section 203 of the DGCL
(as defined below) inapplicable to the Offer, the Merger and the Stockholder
Agreements, determining that the terms of the Offer and the Merger are fair to,
and in the best interests of, the Company's stockholders and recommending that
holders of Shares accept the Offer and that the Company's stockholders approve
this Agreement and the Merger. The Company represents and warrants that its
Board of Directors has received the opinion of U.S. Bancorp Piper Jaffray Inc.
that the proposed consideration to be received by holders of Shares pursuant to
the Offer and the Merger is fair to such holders from a financial point of view,
and a complete and correct signed copy of such opinion has been delivered by the
Company to Parent. The Company has been advised by each of its directors and
executive officers that each such person intends to tender all Shares owned by
such person pursuant to the Offer.

          (b)  On the date the Offer Documents are filed with the SEC, the
Company shall file with the SEC a Solicitation/Recommendation Statement on
Schedule 14D-9 with respect to

                                      -3-
<PAGE>

the Offer (such Schedule 14D-9, as amended from time to time, the "Schedule 14D-
9") containing the recommendation described in paragraph (a), and the Company
shall cause to be disseminated the Schedule 14D-9 to holders of Shares as and to
the extent required by applicable Federal securities laws. Each of the Company,
Parent and Sub agrees promptly to correct any information provided by it for use
in the Schedule 14D-9 if and to the extent that such information shall have
become false or misleading in any material respect, and the Company further
agrees to take all steps necessary to amend or supplement the Schedule 14D-9 and
to cause the Schedule 14D-9 as so amended or supplemented to be filed with the
SEC and disseminated to holders of Shares, in each case as and to the extent
required by applicable Federal securities laws. Parent and its counsel shall be
given reasonable opportunity to review and comment upon the Schedule 14D-9 prior
to its filing with the SEC or dissemination to stockholders of the Company. The
Company agrees to provide Parent and its counsel any comments the Company or its
counsel may receive from the SEC or its staff with respect to the Schedule 14D-9
promptly after the receipt of such comments and to cooperate with Parent, Sub
and their counsel in responding to any such comments.

          (c)  In connection with the Offer and the Merger, the Company shall
cause its transfer agent or agents to furnish Sub promptly with mailing labels
containing the names and addresses of the record holders of Shares as of a
recent date and of those persons becoming record holders subsequent to such
date, together with copies of all lists of stockholders, security position
listings and computer files and all other information in the Company's
possession or control, to the extent reasonably available to the Company,
regarding the beneficial owners of Shares and any securities convertible into
Shares, and shall furnish to Sub such information and assistance (including
updated lists of stockholders, security position listings and computer files) as
Parent may reasonably request in communicating the Offer to the Company's
stockholders. Subject to the requirements of applicable law, and except for such
steps as are necessary to disseminate the Offer Documents and any other
documents necessary to consummate the Merger, Parent and Sub and their agents
shall hold in confidence the information contained in any such labels, listings
and files, will use such information only in connection with the Offer and the
Merger and, if this Agreement shall be terminated, will, upon request, deliver,
and will use their best efforts to cause their agents to deliver, to the Company
all copies of such information then in their possession or control.


                                  ARTICLE II

                                  THE MERGER

          Section 2.1  The Merger. Upon the terms and subject to the conditions
hereof, and in accordance with the General Corporation Law of the State of
Delaware, as amended (the "DGCL"), Sub shall be merged with and into the Company
at the Effective Time (as hereinafter defined). Following the Merger, the
separate corporate existence of Sub shall cease and the Company shall continue
as the surviving corporation (the "Surviving Corporation") and shall

                                      -4-
<PAGE>

succeed to and assume all the rights and obligations of Sub in accordance with
the DGCL. Notwithstanding anything to the contrary herein, at the election of
Parent, any direct wholly-owned Subsidiary (as hereinafter defined) of Parent
may be substituted for Sub as a constituent corporation in the Merger. In such
event, the parties agree to execute an appropriate amendment to this Agreement,
in form and substance reasonably satisfactory to Parent and the Company, in
order to reflect such substitution.

          Section 2.2  Effective Time. The Merger shall become effective when
the certificate of merger or, if applicable, the certificate of ownership and
merger (each, the "Certificate of Merger"), executed in accordance with the
relevant provisions of the DGCL, is filed with the Secretary of State of the
State of Delaware; provided, however, that, upon mutual consent of the
Constituent Corporations, the Certificate of Merger may provide for a later date
of effectiveness of the Merger not more than three (3) business days after the
date the Certificate of Merger is filed. When used in this Agreement, the term
"Effective Time" shall mean the date and time at which the Certificate of Merger
is accepted for record or such later time established by the Certificate of
Merger. The filing of the Certificate of Merger shall be made on the date of the
Closing (as defined in Section 2.9).

           Section 2.3  Effects of the Merger. The Merger shall have the
effects set forth in the DGCL.

          Section 2.4  Charter and Bylaws; Directors and Officers. (a) At the
Effective Time, the Second Restated and Amended Certificate of Incorporation, as
amended, of the Company (the "Company Charter") shall be the Certificate of
Incorporation of the Surviving Corporation until thereafter changed or amended
as provided therein or by applicable law. At the Effective Time, the Amended and
Restated Bylaws of the Company, as in effect immediately prior to the Effective
Time, shall be the Bylaws of the Surviving Corporation until thereafter changed
or amended as provided therein or by the Company Charter.

          (b)  The directors of Sub at the Effective Time shall be the directors
of the Surviving Corporation, until the earlier of their resignation or removal
or until their respective successors are duly elected and qualified, as the case
may be. The officers of the Company at the Effective Time shall be the officers
of the Surviving Corporation, until the earlier of their resignation or removal
or until their respective successors are duly elected and qualified, as the case
may be.

          Section 2.5  Conversion of Securities. (a) As of the Effective Time,
by virtue of the Merger and without any action on the part of Sub, the Company
or the holders of any securities of the Constituent Corporations:

          (i)  Each issued and outstanding share of common stock, par value $.01
     per share, of Sub shall be converted into one validly issued, fully paid
     and nonassessable share of common stock of the Surviving Corporation.

                                      -5-
<PAGE>

          (ii)  All Shares that are held in the treasury of the Company or by
     any wholly-owned Subsidiary of the Company and any Shares owned by Parent,
     any wholly-owned Subsidiary of Parent or Holdings shall be canceled and no
     capital stock of Parent or other consideration shall be delivered in
     exchange therefor.

          (iii)  Subject to the provisions of Section 2.5(a)(iv), each Share
     issued and outstanding immediately prior to the Effective Time (other than
     shares to be canceled in accordance with Section 2.5(a)(ii) and other than
     Dissenting Shares (as defined in Section 2.5(a)(iv)) shall be converted
     into the right to receive from the Surviving Corporation in cash, without
     interest, the per share price paid in the Offer (the "Merger
     Consideration"). All such Shares, when so converted, shall no longer be
     outstanding and shall automatically be canceled and retired and each holder
     of a certificate representing any such Shares shall cease to have any
     rights with respect thereto, except the right to receive the Merger
     Consideration.

          (iv)  Notwithstanding any provision of this Agreement to the contrary,
     if required by the DGCL but only to the extent required thereby, Shares
     which are issued and outstanding immediately prior to the Effective Time
     and which are held by holders who have properly exercised appraisal rights
     with respect thereto in accordance with Section 262 of the DGCL (the
     "Dissenting Shares") will not be exchangeable for the right to receive the
     Merger Consideration, and holders of such Shares will be entitled to
     receive payment of the appraised value of such Shares in accordance with
     the provisions of such Section 262 unless and until such holders fail to
     perfect or effectively withdraw or lose their rights to appraisal and
     payment under the DGCL. If, after the Effective Time, any such holder fails
     to perfect or effectively withdraws or loses such right, such Shares will
     thereupon be treated as if they had been converted into and have become
     exchangeable for, at the Effective Time, the right to receive the Merger
     Consideration, without any interest thereon. The Company will give Parent
     prompt notice of any demands received by the Company for appraisals of
     Shares. The Company shall not, except with the prior written consent of
     Parent, make any payment with respect to any demands for appraisal or offer
     to settle or settle any such demands.

     (b)  Each Company Stock Option (as hereinafter defined) shall be treated in
accordance with Section 6.5 of this Agreement.

          Section 2.6  Exchange of Certificates. (a) Paying Agent. Prior to the
Effective Time, Parent shall designate a bank or trust company (or such other
person or persons as shall be reasonably acceptable to Parent and the Company)
to act as paying agent in the Merger (the "Paying Agent"), and, from time to
time on, prior to or after the Effective Time, Parent shall make available, or
cause the Surviving Corporation to make available, to the Paying Agent cash in
amounts and at the times necessary for the payment of the Merger Consideration
upon surrender of certificates representing Shares as part of the Merger
pursuant to Section 2.5. Any and all

                                      -6-
<PAGE>

interest earned on funds made available to the Paying Agent pursuant to this
Agreement shall be paid over to Parent.

          (b)  Exchange Procedure. As soon as reasonably practicable after the
Effective Time, the Paying Agent shall mail to each holder of record of a
certificate or certificates that immediately prior to the Effective Time
represented Shares (the "Certificates"), (i) a letter of transmittal (which
shall specify that delivery shall be effected, and risk of loss and title to the
Certificates shall pass, only upon delivery of the Certificates to the Paying
Agent and shall be in a form and have such other provisions as Parent may
reasonably specify) and (ii) instructions for use in effecting the surrender of
the Certificates in exchange for the Merger Consideration. Upon surrender of a
Certificate for cancellation to the Paying Agent or to such other agent or
agents as may be appointed by Parent, together with such letter of transmittal,
duly executed, and such other documents as may reasonably be required by the
Paying Agent, the holder of such Certificate shall be entitled to receive in
exchange therefor the amount of cash into which the Shares theretofore
represented by such Certificate shall have been converted pursuant to Section
2.5, and the Certificate so surrendered shall forthwith be canceled. In the
event of a transfer of ownership of Shares that is not registered in the
transfer records of the Company, payment may be made to a person other than the
person in whose name the Certificate so surrendered is registered, if such
Certificate shall be properly endorsed or otherwise be in proper form for
transfer and the person requesting such payment shall pay any transfer or other
taxes required by reason of the payment to a person other than the registered
holder of such Certificate or establish to the satisfaction of the Surviving
Corporation that such tax has been paid or is not applicable. Until surrendered
as contemplated by this Section 2.6, each Certificate (other than Certificates
representing Dissenting Shares) shall be deemed at any time after the Effective
Time to represent only the right to receive upon such surrender the amount of
cash, without interest, into which the Shares theretofore represented by such
Certificate shall have been converted pursuant to Section 2.5. No interest will
be paid or will accrue on the cash payable upon the surrender of any
Certificate. Parent or the Paying Agent shall be entitled to deduct and withhold
from the consideration otherwise payable pursuant to this Agreement to any
holder of Shares such amounts as Parent or the Paying Agent is required to
deduct and withhold with respect to the making of such payment under the Code
(as hereinafter defined) or under any provisions of state, local or foreign tax
law. To the extent that amounts are so withheld by Parent or the Paying Agent,
such withheld amounts shall be treated for all purposes of this Agreement as
having been paid to the person in respect of which such deduction or withholding
was made by the Parent or the Paying Agent.

          (c)  No Further Ownership Rights in Shares. All cash paid upon the
surrender of Certificates in accordance with the terms of this Article II shall
be deemed to have been paid in full satisfaction of all rights pertaining to the
Shares theretofore represented by such Certificates. At the Effective Time, the
stock transfer books of the Company shall be closed, and there shall be no
further registration of transfers on the stock transfer books of the Surviving
Corporation of the Shares that were outstanding immediately prior to the
Effective Time. If, after the Effective

                                      -7-
<PAGE>

Time, Certificates are presented to the Surviving Corporation or the Paying
Agent for any reason, they shall be canceled and exchanged as provided in this
Article II.

          (d)  Termination of Payment Fund. Any portion of the funds made
available to the Paying Agent to pay the Merger Consideration which remains
undistributed to the holders of Shares for six months after the Effective Time
shall be delivered to Parent, upon demand, and any holders of Shares who have
not theretofore complied with this Article II and the instructions set forth in
the letter of transmittal mailed to such holders after the Effective Time shall
thereafter look only to Parent for payment of the Merger Consideration to which
they are entitled.

          (e)  No Liability. None of Parent, Sub, the Company or the Paying
Agent shall be liable to any person in respect of any cash delivered to a public
official pursuant to any applicable abandoned property, escheat or similar law.
If any Certificates shall not have been surrendered prior to seven years after
the Effective Time (or immediately prior to such earlier date on which any
payment pursuant to this Article II would otherwise escheat to or become the
property of any Governmental Entity (as hereinafter defined)), the cash payment
in respect of such Certificate shall, to the extent permitted by applicable law,
become the property of the Surviving Corporation, free and clear of all claims
or interests of any person previously entitled thereto.

          (f)  Lost Certificates. If any Certificate shall have been lost,
stolen or destroyed, upon the making of an affidavit of that fact by the person
claiming such Certificate to be lost, stolen or destroyed and, if required by
Parent or the Paying Agent, the posting by such person of a bond, in such
reasonable amount as Parent or the Paying Agent may direct as indemnity against
any claim that may be made against them with respect to such Certificate, the
Paying Agent will pay in exchange for such lost, stolen or destroyed Certificate
the amount of cash to which the holders thereof are entitled pursuant to Section
2.5.

          Section 2.7  Merger Without Meeting of Stockholders. Notwithstanding
the foregoing, if Sub, or any other direct or indirect subsidiary of Parent,
shall acquire at least 90 percent of the outstanding Shares, the parties hereto
agree to take all necessary and appropriate action to cause the Merger to become
effective as soon as practicable after expiration of the Offer without a meeting
of stockholders of the Company, in accordance with Section 253 of the DGCL.

          Section 2.8  Further Assurances. If at any time after the Effective
Time the Surviving Corporation shall consider or be advised that any deeds,
bills of sale, assignments or assurances or any other acts or things are
necessary, desirable or proper (a) to vest, perfect or confirm, of record or
otherwise, in the Surviving Corporation its right, title or interest in, to or
under any of the rights, privileges, powers, franchises, properties or assets of
either of the Constituent Corporations, or (b) otherwise to carry out the
purposes of this Agreement, the Surviving Corporation and its proper officers
and directors or their designees shall be authorized to execute and deliver, in
the name and on behalf of either of the Constituent Corporations, all such
deeds, bills of sale, assignments and assurances and to do, in the name and on
behalf of either Constituent Corporation, all such other acts and things as may
be necessary, desirable or proper

                                      -8-
<PAGE>

to vest, perfect or confirm the Surviving Corporation's right, title or interest
in, to or under any of the rights, privileges, powers, franchises, properties or
assets of such Constituent Corporation and otherwise to carry out the purposes
of this Agreement.

          Section 2.9  Closing. The closing of the transactions contemplated by
this Agreement (the "Closing") and all actions specified in this Agreement to
occur at the Closing shall take place at the offices of Sidley & Austin, One
First National Plaza, Chicago, Illinois 60603, at 10:00 a.m., local time, no
later than the second business day following the day on which the last of the
conditions set forth in Article VII shall have been fulfilled or waived (if
permissible) or at such other time and place as Parent and the Company shall
agree.


                                  ARTICLE III

               REPRESENTATIONS AND WARRANTIES OF PARENT AND SUB
               ------------------------------------------------

          Parent and Sub represent and warrant to the Company as follows:

          Section 3.1  Organization. Each of Parent and Sub is a corporation
duly organized, validly existing and in good standing under the laws of the
jurisdiction of its incorporation and has all requisite corporate power and
authority to carry on its business as now being conducted. Each of Parent and
Sub is duly qualified to do business, and is in good standing, in each
jurisdiction where the character of its properties owned or held under lease or
the nature of its activities makes such qualification necessary, except where
the failure to be so qualified would not, individually or in the aggregate, have
a Material Adverse Effect on Parent.

          Section 3.2  Authority. On or prior to the date of this Agreement, the
Boards of Directors of Parent and Sub have declared the Merger advisable and the
Board of Directors of Sub has approved and adopted this Agreement in accordance
with the DGCL. Each of Parent and Sub has all requisite corporate power and
authority to execute and deliver this Agreement and the Stockholder Agreements,
and each of Parent and Sub has all requisite corporate power and authority to
consummate the transactions contemplated hereby and thereby. The execution,
delivery and performance by Parent and Sub of this Agreement and the Stockholder
Agreements and the consummation of the transactions contemplated hereby and
thereby have been duly authorized by all necessary corporate action (including
Board action) on the part of Parent and Sub subject, in the case of this
Agreement, to the filing of the Certificate of Merger as required by the DGCL.
This Agreement and the Stockholder Agreements have been duly executed and
delivered by Parent and Sub and (assuming the valid authorization, execution and
delivery of this Agreement by the Company, the valid authorization, execution
and delivery of the Stockholder Agreements by the stockholders who are parties
thereto and the validity and binding effect hereof and thereof on the Company
and such stockholders), this Agreement and the Stockholder Agreements constitute
the valid and binding obligation of each of Parent and Sub enforceable against
them in accordance with their respective terms.

                                      -9-
<PAGE>

          Section 3.3  Consents and Approvals; No Violations. Assuming that all
consents, approvals, authorizations and other actions described in this Section
3.3 have been obtained and all filings and obligations described in this Section
3.3 have been made, the execution and delivery of this Agreement and the
Stockholder Agreements do not, and the consummation of the transactions
contemplated hereby and thereby and compliance with the provisions hereof and
thereof will not, result in any violation of, or default (with or without notice
or lapse of time, or both) under, or give to others a right of termination,
cancellation or acceleration of any obligation or result in the loss of a
material benefit under, or result in the creation of any lien, security
interest, charge or encumbrance upon any of the properties or assets of Parent
or any of its Subsidiaries under, any provision of (i) the Certificate of
Incorporation or the By-Laws of Parent, each as amended to date, (ii) any
provision of the comparable charter or organization documents of any of Parent's
Subsidiaries, (iii) any loan or credit agreement, note, bond, mortgage,
indenture, lease or other agreement, instrument, permit, concession, franchise
or license applicable to Parent or any of its Subsidiaries or (iv) any judgment,
order, decree, statute, law, ordinance, rule or regulation applicable to Parent
or any of its Subsidiaries or any of their respective properties or assets,
other than, in the case of clauses (ii), (iii) or (iv), any such violations,
defaults, rights, liens, security interests, charges or encumbrances that,
individually or in the aggregate, would not have a Material Adverse Effect on
Parent, materially impair the ability of Parent or Sub to perform their
respective obligations hereunder or under the Stockholder Agreements or prevent
the consummation of any of the transactions contemplated hereby or thereby. No
filing or registration with, or authorization, consent or approval of, any
domestic (federal and state), foreign or supranational court, commission,
governmental body, regulatory agency, authority or tribunal (a "Governmental
Entity") is required by or with respect to Parent or any of its Subsidiaries in
connection with the execution and delivery of this Agreement or the Stockholder
Agreements by Parent or Sub or is necessary for the consummation of the Offer,
the Merger and the other transactions contemplated by this Agreement or the
Stockholder Agreements, except for (i) in connection, or in compliance, with the
provisions of the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as
amended (the "HSR Act"), any foreign pre-merger filing obligations and the
Exchange Act, (ii) the filing of the Certificate of Merger with the Secretary of
State of the State of Delaware and appropriate documents with the relevant
authorities of other states in which the Company or any of its Subsidiaries is
qualified to do business, (iii) such filings and consents as may be required
under any environmental, health or safety law or regulation pertaining to any
notification, disclosure or required approval triggered by the Offer, the Merger
or by the transactions contemplated by this Agreement or the Stockholder
Agreements, (iv) such filings, authorizations, orders and approvals as may be
required by state takeover laws (the "State Takeover Approvals"), (v) such
filings as may be required in connection with the taxes described in Section
6.8, (vi) applicable requirements, if any, of state securities or "blue sky"
laws ("Blue Sky Laws"), (vii) as may be required under foreign laws and (viii)
such other consents, orders, authorizations, registrations, declarations and
filings the failure of which to be obtained or made would not, individually or
in the aggregate, have a Material Adverse Effect on Parent, materially

                                     -10-
<PAGE>

impair the ability of Parent or Sub to perform its obligations hereunder or
under the Stockholder Agreements or prevent the consummation of any of the
transactions contemplated hereby or thereby.

          Section 3.4  Information Supplied. None of the information supplied or
to be supplied by Parent or Sub specifically for inclusion or incorporation by
reference in (i) the Offer Documents, (ii) the Schedule 14D-9, (iii) the
information to be filed by the Company in connection with the Offer pursuant to
Rule 14f-1 promulgated under the Exchange Act (the "Information Statement") or
(iv) the proxy statement (together with any amendments or supplements thereto,
the "Proxy Statement") relating to the Stockholder Meeting (as defined in
Section 6.1) will (a) in the case of the Offer Documents, the Schedule 14D-9 and
the Information Statement, at the respective times the Offer Documents, the
Schedule 14D-9 and the Information Statement are filed with the SEC or first
published, sent or given to the Company's stockholders, or (b) in the case of
the Proxy Statement, at the time the Proxy Statement is first mailed to the
Company's stockholders or at the time of the Stockholder Meeting, contain any
untrue statement of a material fact or omit to state any material fact required
to be stated therein or necessary in order to make the statements therein, in
light of the circumstances under which they are made, not misleading. The Offer
Documents will comply as to form in all material respects with the requirements
of the Exchange Act, except that no representation or warranty is made by Parent
or Sub with respect to statements made or incorporated by reference therein
based on information supplied by the Company specifically for inclusion or
incorporation by reference therein.

          Section 3.5  Ownership of Shares. As of the date of this Agreement,
Parent or its affiliates beneficially own 820,000 Shares.

          Section 3.6  Interim Operations of Sub. Sub was formed solely for the
purpose of engaging in the transactions contemplated hereby, has engaged in no
other business activities and has conducted its operations only as contemplated
hereby.

          Section 3.7  Brokers. No broker, investment banker, financial advisor
or other person, other than Chase Securities, Inc., the fees and expenses of
which will be paid by Parent, is entitled to any broker's, finder's, financial
advisor's or other similar fee or commission in connection with the transactions
contemplated by this Agreement based upon arrangements made by or on behalf of
Parent or Sub.

          Section 3.8  Financing. Prior to the consummation of the Offer, Parent
and Sub will have available to them all funds necessary to purchase and pay for
all of the Shares tendered pursuant to the Offer by stockholders of the Company.

                                     -11-
<PAGE>

                                  ARTICLE IV

                 REPRESENTATIONS AND WARRANTIES OF THE COMPANY
                 ---------------------------------------------

          The Company represents and warrants to Parent and Sub as follows:

          Section 4.1  Organization, Standing and Power. The Company is a
corporation duly organized, validly existing and in good standing under the laws
of the State of Delaware and has the requisite corporate power and authority to
carry on its business as now being conducted. Each Subsidiary of the Company is
duly organized, validly existing and in good standing under the laws of the
jurisdiction in which it is organized and has the requisite corporate (in the
case of a Subsidiary that is a corporation) or other power and authority to
carry on its business as now being conducted, except where the failure to be so
organized, existing or in good standing or to have such power or authority would
not, individually or in the aggregate, have a Material Adverse Effect on the
Company. The Company and each of its Subsidiaries are duly qualified to do
business, and are in good standing, in each jurisdiction where the character of
their properties owned or held under lease or the nature of their activities
makes such qualification necessary, except where the failure to be so qualified
would not, individually or in the aggregate, have a Material Adverse Effect on
the Company. A list of all Subsidiaries of the Company, together with the
jurisdiction of incorporation of each Subsidiary, the percentage of the
outstanding capital stock of each Subsidiary owned by the Company and each other
Subsidiary and the name of any person other than the Company or another
Subsidiary that owns capital stock of the Subsidiary, is set forth in Section
4.1 of the letter dated the date hereof and delivered on the date hereof by the
Company to Parent, which relates to this Agreement and is designated therein as
the Company Letter (the "Company Letter").

          Section 4.2  Capital Structure. (a) As of the date hereof, the
authorized capital stock of the Company consists of 27,000,000 Shares and
3,000,000 shares of Preferred Stock, par value $.0001 per share ("Company
Preferred Stock"), of which 140,000 shares have been designated as "Series A
Participating Preferred Stock" (the "Series A Preferred Stock").

          (b)   At the close of business on July 23, 1999:

          (i)   12,752,855 Shares were issued and outstanding, all of which were
     validly issued, fully paid and nonassessable and free of preemptive rights;

          (ii)  no shares of Company Preferred Stock were issued and
outstanding;

          (iii) no Shares were held in the treasury of the Company or by
     Subsidiaries of the Company;

                                     -12-
<PAGE>

          (iv)  422,085 Shares were reserved for issuance upon the exercise of
     outstanding vested and exercisable stock options issued under the Company's
     1995 Stock Option/Stock Issuance  Plan, as amended (the "Company Stock
     Option Plan");

          (v)   667,779 Shares were reserved for issuance upon the exercise of
     outstanding unvested stock options issued under the Company Stock Option
     Plan;

          (vi)  159,632 Shares were reserved for issuance and unissued pursuant
     to the Company's Employee Stock Purchase Plan, as amended (the "Company
     Stock Purchase Plan");

          (vii) 80,000 Shares were reserved for issuance upon the exercise of
     the Warrant dated September 30, 1998 issued to Arthur A. Pilla (the "Pilla
     Warrant"); and

          (viii) 45,000 Shares were reserved for issuance upon the exercise of
     the Warrant dated September 30, 1998 issued to Alessandro Chiabera (the
     "Chiabera Warrant" and, together with the Pilla Warrant, the "Warrants").

          (c)  Section 4.2 of the Company Letter contains a correct and complete
list as of the date of this Agreement of each outstanding option to purchase
Shares issued under the Company Stock Option Plan (collectively, the "Company
Stock Options"), including the holder, date of grant, exercise price and number
of shares of Company Common Stock subject thereto and whether the option is
vested and exercisable.

          (d)  Except for the Company Stock Options, the Company Stock Purchase
Plan, the Warrants, the rights to purchase shares of the Series A Preferred
Stock (the "Rights") issued pursuant to the Rights Agreement dated as of
December 6, 1996, as amended October 22, 1998 (as so amended, the "Rights
Agreement"), between the Company and Registrar and Transfer Company, as Rights
Agent, and the rights (the "Company Option") of Parent under the Master
Agreement dated August 10, 1998, as amended December 21, 1998, between Parent
and the Company, there are no options, warrants, calls, rights or agreements to
which the Company or any of its Subsidiaries is a party or by which any of them
is bound obligating the Company or any of its Subsidiaries to issue, deliver or
sell, or cause to be issued, delivered or sold, additional shares of capital
stock of the Company or any of its Subsidiaries or obligating the Company or any
of its Subsidiaries to grant, extend or enter into any such option, warrant,
call, right or agreement, and there are no outstanding contractual rights to
which the Company or any of its Subsidiaries is a party the value of which is
based on the value of Shares. Except as set forth in Section 4.2 of the Company
Letter, there are no outstanding contractual obligations of the Company or any
Subsidiary to repurchase, redeem or otherwise acquire any shares of Company
Common Stock or any capital stock of or any equity interests in any Subsidiary.

          (e)  Each outstanding share of capital stock of each Subsidiary of the
Company is duly authorized, validly issued, fully paid and nonassessable and,
except as set forth in Section 4.2

                                     -13-
<PAGE>

of the Company Letter, each such share is owned by the Company or another
Subsidiary of the Company, free and clear of all security interests, liens,
claims, pledges, options, rights of first refusal, agreements, limitations on
voting rights, charges and other encumbrances of any nature whatsoever.

          (f) The Company does not have any outstanding bonds, debentures, notes
or other obligations the holders of which have the right to vote (or which are
convertible into or exercisable for securities having the right to vote) with
the stockholders of the Company on any matter.

          Section 4.3  Authority.  On or prior to the date of this Agreement,
the Board of Directors of the Company has unanimously approved the Offer and
declared the Merger advisable and fair to and in the best interest of the
Company and its stockholders, approved and adopted this Agreement and the
transactions contemplated hereby in accordance with the DGCL, resolved to
recommend the acceptance of the Offer by the Company's stockholders and directed
that this Agreement be submitted to the Company's stockholders for approval.
The Company has all requisite corporate power and authority to enter into this
Agreement and, subject to approval by the stockholders of the Company of this
Agreement, to consummate the transactions contemplated hereby.  The execution
and delivery of this Agreement by the Company and the consummation by the
Company of the transactions contemplated hereby have been duly authorized by all
necessary corporate action (including Board action) on the part of the Company,
subject to (x) approval and adoption of this Agreement by the stockholders of
the Company and (y) the filing of the Certificate of Merger as required by the
DGCL.  This Agreement has been duly executed and delivered by the Company and
(assuming the valid authorization, execution and delivery of this Agreement by
Parent and Sub and the validity and binding effect of this Agreement on Parent
and Sub) constitutes the valid and binding obligation of the Company enforceable
against the Company in accordance with its terms.

          Section 4.4  Consents and Approvals; No Violation.  Assuming that all
consents, approvals, authorizations and other actions described in this Section
4.4 have been obtained and all filings and obligations described in this Section
4.4 have been made, the execution and delivery of this Agreement does not, and
the consummation of the transactions contemplated hereby and compliance with the
provisions hereof will not, result in any violation of, or default (with or
without notice or lapse of time, or both) under, or give to others a right of
termination, cancellation or acceleration of any obligation or result in the
loss of a material benefit under, or result in the creation of any lien,
security interest, charge or encumbrance upon any of the properties or assets of
the Company or any of its Subsidiaries under, any provision of (i) the Company
Charter or the Amended and Restated Bylaws of the Company, (ii) any provision of
the comparable charter or organization documents of any of the Company's
Subsidiaries, (iii) any loan or credit agreement, note, bond, mortgage,
indenture, lease or other agreement, instrument, permit, concession, franchise
or license applicable to the Company or any of its Subsidiaries or (iv) any
judgment, order, decree, statute, law, ordinance, rule or regulation applicable
to the Company or any of its Subsidiaries or any of their respective properties
or assets, other than, in

                                     -14-
<PAGE>

the case of clauses (ii), (iii) or (iv), any such violations, defaults, rights,
liens, security interests, charges or encumbrances that, individually or in the
aggregate, would not have a Material Adverse Effect on the Company, materially
impair the ability of the Company to perform its obligations hereunder or
prevent the consummation of any of the transactions contemplated hereby. No
filing or registration with, or authorization, consent or approval of, any
Governmental Entity is required by or with respect to the Company or any of its
Subsidiaries in connection with the execution and delivery of this Agreement by
the Company or is necessary for the consummation of the Offer, the Merger and
the other transactions contemplated by this Agreement, except for (i) in
connection, or in compliance, with the provisions of the HSR Act, any foreign
pre-merger filing obligation and the Exchange Act, (ii) the filing of the
Certificate of Merger with the Secretary of State of the State of Delaware and
appropriate documents with the relevant authorities of other states in which the
Company or any of its Subsidiaries is qualified to do business, (iii) such
filings and consents as may be required under any environmental, health or
safety law or regulation pertaining to any notification, disclosure or required
approval triggered by the Offer, the Merger or the transactions contemplated by
this Agreement, (iv) such filings, authorizations, orders and approvals as may
be required to obtain the State Takeover Approvals, (v) such filings as may be
required in connection with the taxes described in Section 6.8, (vi) applicable
requirements, if any, of Blue Sky Laws or the Nasdaq National Market, (vii) as
may be required under foreign laws and (viii) such other consents, orders,
authorizations, registrations, declarations and filings the failure of which to
be obtained or made would not, individually or in the aggregate, have a Material
Adverse Effect on the Company, materially impair the ability of the Company to
perform its obligations hereunder or prevent the consummation of any of the
transactions contemplated hereby.

          Section 4.5  SEC Documents and Other Reports. The Company has filed
all required documents (including proxy statements) with the SEC since October
1, 1996 (the "Company SEC Documents"). As of their respective dates, the Company
SEC Documents complied in all material respects with the requirements of the
Securities Act of 1933, as amended (the "Securities Act"), or the Exchange Act,
as the case may be, and, at the respective times they were filed, none of the
Company SEC Documents contained any untrue statement of a material fact or
omitted to state a material fact required to be stated therein or necessary to
make the statements therein, in light of the circumstances under which they were
made, not misleading. The consolidated financial statements (including, in each
case, any notes thereto) of the Company included in the Company SEC Documents
complied as to form in all material respects with applicable accounting
requirements and the published rules and regulations of the SEC with respect
thereto, were prepared in accordance with United States generally accepted
accounting principles (except, in the case of the unaudited statements, as
permitted by Form 10-Q of the SEC) applied on a consistent basis during the
periods involved (except as may be indicated therein or in the notes thereto)
and fairly presented in all material respects the consolidated financial
position of the Company and its consolidated Subsidiaries as at the respective
dates thereof and the consolidated results of their operations and their
consolidated cash flows for the periods then ended (subject, in the case of
unaudited statements, to normal year-end audit adjustments and to any other
adjustments described therein). Except as disclosed in the Company SEC Documents

                                     -15-
<PAGE>

or as required by generally accepted accounting principles, the Company has not,
since October 1, 1996, made any change in the accounting practices or policies
applied in the preparation of financial statements.

          Section 4.6  Information Supplied. None of the information supplied or
to be supplied by the Company specifically for inclusion or incorporation by
reference in (i) the Offer Documents, (ii) the Schedule 14D-9, (iii) the
Information Statement or (iv) the Proxy Statement, will (a) in the case of the
Offer Documents, the Schedule 14D-9 and the Information Statement, at the
respective times the Offer Documents, the Schedule 14D-9 and the Information
Statement are filed with the SEC or first published, sent or given to the
Company's stockholders, or (b) in the case of the Proxy Statement, at the time
the Proxy Statement is first mailed to the Company's stockholders or at the time
of the Stockholder Meeting, contain any untrue statement of a material fact or
omit to state any material fact required to be stated therein or necessary in
order to make the statements therein, in light of the circumstances under which
they are made, not misleading. The Schedule 14D-9, the Information Statement and
the Proxy Statement will comply as to form in all material respects with the
requirements of the Exchange Act, except that no representation or warranty is
made by the Company with respect to statements made or incorporated by reference
therein based on information supplied by Parent or Sub specifically for
inclusion or incorporation by reference therein.

          Section 4.7  Absence of Certain Changes or Events. Except as disclosed
in the Company SEC Documents filed with the SEC prior to the date of this
Agreement or as set forth in the Company Letter, since September 30, 1998, (A)
the Company and its Subsidiaries have not incurred any material liability or
obligation (indirect, direct or contingent), or entered into any material oral
or written agreement or other transaction, that is not in the ordinary course of
business or that would result in a Material Adverse Effect on the Company, (B)
the Company and its Subsidiaries have not sustained any loss or interference
with their business or properties from fire, flood, windstorm, accident or other
calamity (whether or not covered by insurance) that has had a Material Adverse
Effect on the Company, (C) there has been no change in the capital stock of the
Company except for the issuance of shares of the Company Common Stock pursuant
to Company Stock Options or the Company Stock Purchase Plan and no dividend or
distribution of any kind declared, paid or made by the Company on any class of
its stock, (D) there has not been (v) any adoption of a new Company Plan (as
hereinafter defined), (w) any amendment to a Company Plan materially increasing
benefits thereunder, (x) any granting by the Company or any of its Subsidiaries
to any executive officer or other key employee of the Company or any of its
Subsidiaries of any increase in compensation, except in the ordinary course of
business consistent with prior practice or as was required under employment
agreements in effect as of the date of the most recent audited financial
statements included in the Company SEC Documents filed prior to the date hereof,
(y) any granting by the Company or any of its Subsidiaries to any such executive
officer or other key employee of any increase in severance or termination
agreements in effect as of the date of the most recent audited financial
statements included in the Company SEC Documents filed prior to the date hereof
or (z) any entry by the Company or any of its Subsidiaries into any employment,
severance or termination agreement with any such executive

                                     -16-
<PAGE>

officer or other key employee, (E) there has not been any material changes in
the amount or terms of the indebtedness of the Company and its Subsidiaries from
that described in the Company SEC Documents filed prior to the date hereof and
(F) there has been no event causing a Material Adverse Effect on the Company,
nor any development that would, individually or in the aggregate, result in a
Material Adverse Effect on the Company.

          Section  4.8  Permits and Compliance.  (a) Each of the Company and its
Subsidiaries is in possession of all franchises, grants, authorizations,
licenses, permits, easements, variances, exceptions, consents, certificates,
approvals and orders of any Governmental Entity necessary for the Company or any
of its Subsidiaries to own, lease and operate its properties or to carry on its
business as it is now being conducted (the "Company Permits"), except where the
failure to have any of the Company Permits would not, individually or in the
aggregate, have a Material Adverse Effect on the Company and, other than as set
forth in the succeeding sentence, except for permits and authorizations for the
manufacture, sale or distribution of or reimbursement for medical devices
("Regulatory Permits").  The Regulatory Permits held by the Company (the
"Company Regulatory Permits") are set forth in Section 4.8 of the Company
Letter.  No suspension or cancellation of any of the Company Permits or the
Company Regulatory Permits is pending or, to the Knowledge of the Company (as
hereinafter defined), threatened, except where the suspension or cancellation of
any of the Company Permits or the Company Regulatory Permits would not,
individually or in the aggregate, have a Material Adverse Effect on the Company.
The Company has obtained certification to ISO 9000 Series standards of its SAFHS
(as hereinafter defined) devices.  All existing products sold, marketed or
distributed by the Company in Europe have CE Marking authorization under the
European Medical Device Directive, as audited and approved by a European
Notified Body.  Neither the Company nor any of its Subsidiaries is in violation
of (A) its charter, by-laws or other organizational documents, (B) any law,
ordinance, administrative or governmental rule or regulation, including any
consumer protection, equal opportunity, health, health care industry regulation
and third-party reimbursement laws including under any Federal Health Care
Program (as defined in Section 1128B(f) of the U.S. Federal Social Security Act
(together with all regulations promulgated thereunder, the "SSA")), or (C) any
order, decree or judgment of any Governmental Entity having jurisdiction over
the Company or any of its Subsidiaries, except, in the case of clauses (B) and
(C), for any violations that, individually or in the aggregate, would not have a
Material Adverse Effect on the Company.  Without limiting the foregoing, the
Company and each Subsidiary is in compliance in all material respects with all
current applicable statutes, rules, regulations or orders administered or issued
by the United States Food and Drug Administration (the "FDA") or comparable
foreign Governmental Entity; the Company does not have knowledge of any facts
which furnish any reasonable basis for any warning letters from the FDA, Section
305 notices, or other similar communications from the FDA or comparable foreign
entity; and since September 30, 1996, there have been no recalls, field
notifications, alerts or seizures requested or threatened relating to the
products of the Company or its Subsidiaries, except as set forth in Section 4.8
of the Company Letter.  The Sonic Accelerated Fracture Healing System ("SAFHS")
devices marketed by the Company in the United States are being marketed in the
United States under valid 510(k) or Pre-Market Approval Applications.  To the
Knowledge of the Company, there is

                                     -17-
<PAGE>

no false information or significant omission in any product application or
product-related submission made by the Company or any of its Subsidiaries to the
FDA or comparable foreign Governmental Entity. The Company and its Subsidiaries
have obtained all necessary regulatory approvals from any foreign regulatory
agencies related to the distribution and sale of SAFHS devices by the Company
and its Subsidiaries in the respective foreign jurisdictions in which such SAFHS
devices are distributed and sold. Neither the Company nor any Subsidiary, nor
the officers, directors, managing employees or agents (as those terms are
defined in 42 C.F.R. (S)1001.1001) of the Company or any Subsidiary: (i) have
engaged in any activities which are prohibited under, or are cause for civil
penalties or mandatory or permissive exclusion from, any Federal Health Care
Program under Sections 1128, 1128A, 1128B, or 1877 of SSA or related state or
local statutes, including knowingly and willfully offering, paying, soliciting
or receiving any remuneration (including any kickback, bribe or rebate),
directly or indirectly, overtly or covertly, in cash or in kind in return for,
or to induce, the purchase, lease, or order, or the arranging for or
recommending of the purchase, lease or order, of any item or service for which
payment may be made in whole or in part under any such program; (ii) have had a
civil monetary penalty assessed against them under Section 1128A of SSA; (iii)
have been excluded from participation under any Federal Health Care Program; or
(iv) have been convicted (as defined in 42 C.F.R. (S) 1001.2) of any of the
categories of offenses described in Sections 1128(a) or 1128(b)(1), (b)(2), or
(b)(3) of SSA.

          (b) Except as disclosed in the Company SEC Documents filed prior to
the date of this Agreement, there are no contracts or agreements of the Company
or its Subsidiaries having terms or conditions which would have a Material
Adverse Effect on the Company or having covenants not to compete that materially
impair the ability of the Company to conduct its business as currently conducted
or purport to bind any stockholder or any Affiliated Person of any stockholder
of the Company after the Effective Time.  Except as set forth in the Company SEC
Documents filed prior to the date of this Agreement, no event of default or
event that, but for the giving of notice or the lapse of time or both, would
constitute an event of default exists or, upon the consummation by the Company
of the transactions contemplated by this Agreement, will exist under any
indenture, mortgage, loan agreement, note or other agreement or instrument for
borrowed money, any guarantee of any agreement or instrument for borrowed money
or any lease, contractual license or other agreement or instrument to which the
Company or any of its Subsidiaries is a party or by which the Company or any
such Subsidiary is bound or to which any of the properties, assets or operations
of the Company or any such Subsidiary is subject, other than any defaults that,
individually or in the aggregate, would not have a Material Adverse Effect on
the Company.

          Section 4.9   Tax Matters.  Except as otherwise set forth in Section
4.9 of the Company Letter, (i) the Company and each of its Subsidiaries have
filed all Tax Returns (as hereinafter defined) required to have been filed, and
such Tax Returns are correct and complete and disclose all Taxes (as hereinafter
defined) required to be paid by the Company and its Subsidiaries for the periods
covered thereby, except to the extent that any failure to so file or any failure
to be correct and complete or to disclose all Taxes required to be paid would
not, individually or in the aggregate have a Material Adverse Effect on the
Company; (ii) all Taxes shown to be due on such Tax Returns have been timely
paid or extensions for payment have been

                                     -18-
<PAGE>

properly obtained, or such Taxes are being contested; (iii) the Company and each
of its Subsidiaries have complied with all rules and regulations relating to the
withholding of Taxes and the remittance of withheld Taxes, except to the extent
that any failure to comply with such rules and regulations would not,
individually or in the aggregate have a Material Adverse Effect on the Company;
(iv) neither the Company nor any of its Subsidiaries has waived any statute of
limitations in respect of its Taxes; (v) any Tax Returns required to have been
filed by or with respect to the Company and each of its Subsidiaries relating to
federal and state income Taxes have been examined by the Internal Revenue
Service ("IRS") or the appropriate foreign or state taxing authority or the
period for assessment of the Taxes in respect of which such Tax Returns were
required to be filed has expired; (vi) to the Knowledge of the Company, no
issues that have been raised by the relevant taxing authority in connection with
the examination of Tax Returns required to have been filed by or with respect to
the Company and each of its Subsidiaries which are currently pending; (vii) all
deficiencies asserted or assessments made as a result of any examination of such
Tax Returns by any taxing authority have been paid in full or properly reflected
on the books of the Company; and (viii) there is no action, suit, investigation,
audit, claim or assessment pending or, to the Knowledge of the Company, proposed
or threatened in writing with respect to Taxes of the Company or any Subsidiary;
(ix) there are no liens for Taxes upon the assets of the Company or any
Subsidiary except liens relating to current Taxes not yet due; (x) none of the
Company or any Subsidiary has been a member of any group of corporations filing
Tax Returns on a consolidated, combined, unitary or similar basis other than
each such group of which it is currently a member; (xi) no transaction
contemplated by this Agreement is subject to withholding under Section 1445 of
the Code (relating to "FIRPTA") and no stock transfer Taxes, sales Taxes, use
Taxes, real estate transfer Taxes, or other similar Taxes will be imposed on the
transactions contemplated by this Agreement; (xii) except as may be limited by
the transactions contemplated by this Agreement, the "regular" and, if
applicable, "alternative minimum tax" net operating loss carry forwards of the
Company and its Subsidiaries for each of the taxable years ended on or prior to
September 30, 1998 (collectively, the "NOLs") are set forth (for each year) in
Section 4.9 of the Company Letter and are each available to the Company or the
applicable Subsidiary) for the period set forth in Section 172(b)(A) of the Code
as in effect for the taxable year in which the applicable NOL was incurred; and
(xiii) except as may be limited as a result of the transactions contemplated by
this Agreement, immediately prior to the Effective Time, none of the NOLs will
constitute separate return limitation year (SRLY) losses, consolidated return
change of ownership (CRCO) losses or "dual consolidated losses" and none of the
NOLs will be limited by sections 382 or 384 of the Code and the regulations
thereunder.

          Section  4.10  Actions and Proceedings.  There are no outstanding
orders, judgments, injunctions, awards or decrees of any Governmental Entity
against or involving the Company or any of its Subsidiaries, or against or
involving any of the present or former directors, officers, employees,
consultants, agents or stockholders of the Company or any of its Subsidiaries
with respect to the Company or any of its Subsidiaries, any of the properties,
assets or business of the Company or any of its Subsidiaries or any Company Plan
that, individually or in the aggregate, would have a Material Adverse Effect on
the Company or materially impair the ability of the Company to perform its
obligations hereunder.  Except as set forth in Section 4.10 of the Company
Letter, there are no actions, suits or claims or legal, administrative or
arbitrative proceedings or investigations (including claims for workers'
compensation) pending or, to the

                                     -19-
<PAGE>

Knowledge of the Company, threatened against or involving the Company or any of
its Subsidiaries or any of its or their present or former directors, officers,
employees, consultants, agents or stockholders with respect to the Company or
any of its Subsidiaries, or any of the properties, assets or business of the
Company or any of its Subsidiaries or any Company Plan that, individually or in
the aggregate, would have a Material Adverse Effect on the Company or materially
impair the ability of the Company to perform its obligations hereunder. There
are no actions, suits, labor disputes or other litigation, legal or
administrative proceedings or governmental investigations pending or, to the
Knowledge of the Company, threatened against or affecting the Company or any of
its Subsidiaries or any of its or their present or former officers, directors,
employees, consultants, agents or stockholders with respect to the Company or
its Subsidiaries, or any of the properties, assets or business of the Company or
any of its Subsidiaries relating to the transactions contemplated by this
Agreement.

          Section 4.11  Certain Agreements.  Except as set forth in Section 4.11
of the Company Letter, neither the Company nor any of its Subsidiaries is a
party to any oral or written agreement or plan, including any employment
agreement, severance agreement, stock option plan, stock appreciation rights
plan, restricted stock plan or stock purchase plan (collectively, the
"Compensation Agreements"), pension plan (as defined in Section 3(2) of ERISA)
or welfare plan (as defined in Section 3(1) of ERISA) any of the benefits of
which will be increased, or the vesting of the benefits of which will be
accelerated, by the occurrence of any of the transactions contemplated by this
Agreement or the value of any of the benefits of which will be calculated on the
basis of any of the transactions contemplated by this Agreement.  Except as set
forth in Section 4.11 of the Company Letter, no holder of any option to purchase
Shares, or Shares granted in connection with the performance of services for the
Company or its Subsidiaries, is or will be entitled to receive cash from the
Company or any Subsidiary in lieu of or in exchange for such option or shares as
a result of the transactions contemplated by this Agreement.  Section 4.11 of
the Company Letter sets forth (i) for each officer, director or employee who is
a party to, or will receive benefits under, any Compensation Agreement as a
result of the transactions contemplated herein, the total amount that each such
person may receive, or is eligible to receive, assuming that the transactions
contemplated by this Agreement are consummated on the date hereof, and (ii) the
total amount of indebtedness owed to the Company or its Subsidiaries from each
officer, director or employee of the Company and its Subsidiaries.

          Section 4.12  ERISA.  (a)  Each Company Plan is listed in Section
4.12(a) of the Company Letter.  With respect to each Company Plan, the Company
has made available to Parent a true and correct copy of (i) the three most
recent annual reports (Form 5500) filed with the IRS, if applicable,  (ii) each
such Company Plan that has been reduced to writing and all amendments thereto,
(iii) each trust agreement, insurance contract or administration agreement
relating to each such Company Plan, (iv) a written summary of each unwritten
Company Plan, (v) the most recent summary plan description or other written
explanation of each Company Plan provided to participants, (vi) the most recent
determination letter and request therefor, if any, issued by the IRS with
respect to any Company Plan intended to be qualified under Section 401(a) of the
Code, (vii) any request for a determination currently pending before the IRS and
(viii) all correspondence with the IRS, the Department of Labor, or the SEC
relating to any outstanding controversy.  Except as would not have a Material
Adverse Effect on the Company, each

                                     -20-
<PAGE>

Company Plan complies in all respects with ERISA, the Code and all other
applicable statutes and governmental rules and regulations. Neither the Company
nor any ERISA Affiliate currently maintains, contributes to or has any liability
under, or at any time during the past six years has maintained or contributed
to, any pension plan which is subject to Section 412 of the Code or Section 302
of ERISA or Title IV of ERISA. Neither the Company nor any ERISA Affiliate
currently maintains, contributes to or has any liability under, or at any time
during the past six years has maintained or contributed to, any Company
Multiemployer Plan.

          (b)  Except as listed in Section 4.12(b) of the Company Letter, with
respect to the Company Plans, to the Knowledge of the Company, no event has
occurred and there exists no condition or set of circumstances in connection
with which the Company or any Subsidiary or ERISA Affiliate or Company Plan
fiduciary could be subject to any liability under the terms of such Company
Plans, ERISA, the Code or any other applicable law which would have a Material
Adverse Effect on the Company.  All Company Plans that are intended to be
qualified under Section 401(a) of the Code have been determined by the IRS to be
so qualified, or a timely application for such determination is now pending and
the Company is not aware of any reason why any such Company Plan is not so
qualified in operation.  Except as disclosed in Section 4.12(b) of the Company
Letter, neither the Company nor any of its Subsidiaries or ERISA Affiliates has
any liability or obligation under any welfare plan to provide benefits after
termination of employment to any employee or dependent other than as required by
Section 4980B of the Code.

          (c)  As used herein, (i) "Company Plan" means a "pension plan" (as
defined in Section 3(2) of ERISA (other than a Company Multiemployer Plan)), a
"welfare plan" (as defined in Section 3(1) of ERISA), or any other written or
oral bonus, profit sharing, deferred compensation, incentive compensation, stock
ownership, stock purchase, stock option, phantom stock, restricted stock, stock
appreciation right, holiday pay, vacation, severance, medical, dental, vision,
disability, death benefit, sick leave, fringe benefit, personnel policy,
insurance or other plan, arrangement or understanding, in each case established
or maintained by the Company or any of its Subsidiaries or any ERISA Affiliate
or as to which the Company or any of its Subsidiaries or any ERISA Affiliate has
contributed or otherwise may have any liability, (ii) "Company Multiemployer
Plan" means a "multiemployer plan" (as defined in Section 4001(a)(3) of ERISA)
to which the Company or any of its Subsidiaries or any ERISA Affiliate is or has
been obligated to contribute or otherwise may have any liability, and (iii)
"ERISA Affiliate" means any trade or business (whether or not incorporated)
which would be considered a single employer with the Company or any of its
Subsidiaries pursuant to Section 414(b), (c), (m) or (o) of the Code and the
regulations promulgated under those sections or pursuant to Section 4001(b) of
ERISA and the regulations promulgated thereunder.

          (d)  Section 4.12(d) of the Company Letter contains a list of all (i)
severance and employment agreements with employees of the Company and each of
its Subsidiaries, (ii) severance programs and policies of the Company and each
of its Subsidiaries with or relating to its employees and (iii) plans, programs,
agreements and other arrangements of the Company and each of its Subsidiaries
with or relating to its employees containing change of control or similar
provisions.

                                     -21-
<PAGE>

          (e)  Except as set forth in Section 4.12(e) of the Company Letter,
neither the Company nor any of its Subsidiaries is a party to any agreement,
contract or arrangement that could result, separately or in the aggregate, in
the payment of any "excess parachute payments" within the meaning of Section
280G of the Code.

          (f)  Except as set forth in Section 4.12(f) of the Company Letter, no
Company Plan is subject to laws outside of the United States.

          Section 4.13  Compliance with Worker Safety Laws.  The properties,
assets and operations of the Company and its Subsidiaries are in compliance with
all applicable federal, state, local and foreign laws, rules and regulations,
orders, decrees, judgments, permits and licenses relating to public and worker
health and safety (collectively, "Worker Safety Laws"), except for any
violations that, individually or in the aggregate, would not have a Material
Adverse Effect on the Company.  With respect to such properties, assets and
operations, including any previously owned, leased or operated properties,
assets or operations, there are no past, present or reasonably anticipated
future events, conditions, circumstances, activities, practices, incidents,
actions or plans of the Company or any of its Subsidiaries that may interfere
with or prevent compliance or continued compliance with applicable Worker Safety
Laws, other than any such interference or prevention as would not, individually
or in the aggregate with any such other interference or prevention, have a
Material Adverse Effect on the Company.

          Section 4.14  Liabilities; Products.  (a)  Except as fully reflected
or reserved against in the financial statements included in the Company SEC
Documents filed prior to the date hereof, or disclosed in the footnotes thereto,
since September 30, 1998 the Company and its Subsidiaries have incurred no
liabilities (including Tax liabilities) or obligations of any nature, absolute
or contingent, other than liabilities or obligations that would not,
individually or in the aggregate, have a Material Adverse Effect on the Company
or that would be required by Generally Accepted Accounting Principles ("GAAP")
to be reflected or reserved in the financial statements of the Company or in the
footnotes thereto, prepared in accordance with GAAP consistent with past
practices, other than in the ordinary course of business and consistent with
past practices.  As of the date hereof, the indebtedness for borrowed money of
the Company and its Subsidiaries (other than advances from the Company to such
Subsidiaries) does not exceed $1 million.

          (b)  Except as set forth in Section 4.14(b) of the Company Letter,
since September 30, 1996, neither the Company nor any Subsidiary has received a
claim for or based upon breach of product warranty (other than warranty service
and repair claims in the ordinary course of business not material in amount or
significance), strict liability in tort, negligent manufacture of product,
negligent provision of services or any other allegation of liability, including
or resulting in product recalls, arising from the materials, design, testing,
manufacture, packaging, labeling (including instructions for use), or sale of
its products or from the provision of services; and, to the Knowledge of the
Company, there is no basis for any such claim which, if asserted, would likely
have a Material Adverse Effect on the Company.  No product sold or delivered or
service rendered by the Company or any Subsidiary is subject to any guaranty,
warranty or other indemnity beyond the applicable standard terms and conditions
of sale for products delivered and

                                     -22-
<PAGE>

services rendered by the Company or any Subsidiary, copies of which have
previously been delivered to Parent.

          (c)  The Company has provided to Parent a schedule of products in
development and planned introductions, a copy of which is attached to the
Company Letter.

          Section 4.15  Labor Matters.  Except as set forth in Section 4.15 of
the Company Letter, neither the Company nor any of its Subsidiaries is a party
to any collective bargaining agreement or labor contract.  Neither the Company
nor any of its Subsidiaries has engaged in any unfair labor practice with
respect to any persons employed by or otherwise performing services primarily
for the Company or any of its Subsidiaries (the "Company Business Personnel"),
and there is no unfair labor practice complaint or grievance against the Company
or any of its Subsidiaries by any person pursuant to the National Labor
Relations Act or any comparable state or foreign law pending or threatened in
writing with respect to the Company Business Personnel, except where such unfair
labor practice, complaint or grievance would not have a Material Adverse Effect
on the Company.  There is no labor strike, dispute, slowdown or stoppage pending
or, to the Knowledge of the Company, threatened against or affecting the Company
or any of its Subsidiaries which may interfere with the respective business
activities of the Company or any of its Subsidiaries, except where such dispute,
strike or work stoppage would not have a Material Adverse Effect on the Company.

          Section 4.16  Intellectual Property; Year 2000.  (a) As used herein,
"Company Intellectual Property" means all trademarks, trademark registrations,
trademark rights and renewals thereof, trade names, trade name rights, patents,
patent rights, patent applications, industrial models, inventions, invention
disclosures, designs, utility models, inventor rights, software, computer
programs, computer systems, modules and related data and materials, copyrights,
copyright registrations and renewals thereof, servicemarks, servicemark
registrations and renewals thereof, servicemark rights, trade secrets,
applications for trademark and servicemark registrations, know-how, confidential
information and other proprietary rights, and any data and information of any
nature or form used or held for use in connection with the businesses of the
Company and/or the Subsidiaries as currently conducted or as currently
contemplated by the Company, together with all applications currently pending or
in process for any of the foregoing; and "Year 2000 Compliant" means the ability
of computers, computer software and computerized devices to process (including
calculate, compare, sequence, display or store), transmit or receive date data
from, into and between the twentieth and twenty-first centuries, and the years
1999 and 2000, and leap year calculations without error or malfunction.

          (b)  Except as disclosed in the Company SEC Documents filed with the
SEC prior to the date hereof, the Company and the Subsidiaries own, or possess
adequate licenses or other valid rights to use (including the right to
sublicense to customers, suppliers or others as needed), all of the material
Company Intellectual Property that is necessary for the conduct or contemplated
conduct of the Company's or Subsidiaries' businesses.  Section 4.16 of the
Company Letter lists each material license or other agreement pursuant to which
the Company or any Subsidiary has the right to use Company Intellectual Property
utilized in connection with any product of, or service provided by, the Company
and the Subsidiaries, the cancellation or

                                     -23-
<PAGE>

expiration of which would have a Material Adverse Effect on the Company (the
"Company Licenses"). There are no pending, or, to the Knowledge of the Company,
threatened interferences, re-examinations, oppositions or cancellation
proceedings involving any patents or patent rights, trademarks or trademark
rights, or applications therefor, of the Company or any Subsidiary, except such
as would not, individually or in the aggregate, have a Material Adverse Effect
on the Company. There is no breach or violation by the Company or by any
Subsidiary under, and, to the Knowledge of the Company, there is no breach or
violation by any other party to, any Company License that is reasonably likely
to give rise to any termination or any loss of rights thereunder. To the
Knowledge of the Company, there has been no unauthorized disclosure or use of
confidential information, trade secret rights, processes and formulas, research
and development results and other know-how of the Company or any Subsidiary,
except where such disclosure or use of such information would not, individually
or in the aggregate, have a Material Adverse Effect on the Company. To the
Knowledge of the Company, the conduct of the business of the Company and the
Subsidiaries as currently conducted or contemplated does not and will not
infringe upon or conflict with, in any way, any license, trademark, trademark
right, trade name, trade name right, patent issued as of the date hereof, patent
right, industrial model, invention, service mark, service mark right, copyright
or trade secret of any third party that, individually or in the aggregate, would
have a Material Adverse Effect on the Company. Except as disclosed in the
Company SEC Documents filed with the SEC prior to the date hereof, to the
Knowledge of the Company, there are no infringements of, or conflicts with, any
Company Intellectual Property which, individually or in the aggregate, would
have a Material Adverse Effect on the Company. Except as set forth in Section
4.16 of the Company Letter, neither the Company nor any Subsidiary has licensed
or otherwise permitted the use by any third party of any proprietary information
or Company Intellectual Property on terms or in a manner which, individually or
in the aggregate, would have a Material Adverse Effect on the Company.

          (c)  Except as set forth in Section 4.16 of the Company Letter, the
current and previously sold products of the Company and its Subsidiaries and
software, operations, systems and processes (including, to the Knowledge of the
Company, software, operations, systems and processes obtained from third
parties) used in the conduct of the business of the Company and its
Subsidiaries, are Year 2000 Compliant except where the failure to be Year 2000
Compliant would not, individually or in the aggregate, have a Material Adverse
Effect on the Company and the Company has delivered to Parent true and correct
copies of any consultant or other third-party reports prepared on behalf of the
Company with respect to such compliance.

          Section 4.17 Title to Assets. (a) As of the date hereof, the Company
and the Subsidiaries own, and as of the Effective Time the Company and the
Subsidiaries will own, good and marketable title to all of their assets material
to their business (excluding, for purposes of this sentence, assets held under
leases or assets covered under Section 4.16 hereof), free and clear of any and
all mortgages, liens, encumbrances, charges, claims, restrictions, pledges,
security interests or impositions, except as set forth in the Company SEC
Documents filed with the SEC prior to the date hereof, or Section 4.17 of the
Company Letter.

          (b)  Neither the Company nor any of its Subsidiaries owns any Real
Estate.  The leases to all Real Estate occupied by the Company and the
Subsidiaries which are material to the

                                     -24-
<PAGE>

operation of the businesses of the Company are in full force and effect and no
event has occurred which with the passage of time, the giving of notice, or
both, would constitute a default or event of default by the Company or any
Subsidiary or, to the Knowledge of the Company, any other person who is a party
signatory thereto, other than such defaults or events of default which,
individually or in the aggregate, would not have a Material Adverse Effect on
the Company.

          Section 4.18  State Takeover Statutes; Rights Agreement. (a) The Board
of Directors of the Company has, to the extent such statutes are applicable,
taken all action so to render the provisions of Section 203 of the DGCL
inapplicable to the Offer, the Merger and the Stockholder Agreements and the
consummation of the transactions contemplated by this Agreement and the
Stockholder Agreements. As of the date hereof, no other state takeover statute
or similar charter or bylaw provisions are applicable to the Offer, the Merger,
this Agreement, the Stockholder Agreements and the transactions contemplated
hereby and thereby.

          (b)  The amendment to the Rights Agreement in the form of Exhibit C
has been duly approved by the Company's Board of Directors and duly executed and
delivered by the Company.

          Section 4.19  Required Vote of Company Stockholders. The affirmative
vote of the holders of at least a majority of Shares entitled to vote is
required to adopt this Agreement. No other vote of the security holders of the
Company is required by law, the Company Charter or the Amended and Restated
Bylaws of the Company or otherwise in order for the Company to consummate the
Merger and the transactions contemplated hereby.

          Section 4.20  Accounts Receivable. All of the accounts and notes
receivable of the Company and its Subsidiaries set forth on the books and
records of the Company (net of the applicable reserves reflected on the books
and records of the Company and in the financial statements included in the
Company SEC Documents) (i) represent sales actually made or transactions
actually effected in the ordinary course of business for goods or services
delivered or rendered to unaffiliated customers in bona fide arm's length
transactions, (ii) constitute valid claims, and (iii) are good and collectible
at the aggregate recorded amounts thereof (net of such reserves) without right
of recourse, defense, deduction, return of goods, counterclaim, or offset and
have been or will be collected in the ordinary course of business and consistent
with past experience, except where the failure to collect such receivables in
such manner would not, individually or in the aggregate, have a Material Adverse
Effect on the Company.

          Section 4.21  Inventories. Except as set forth in Section 4.21 of the
Company Letter, all inventories of the Company and its Subsidiaries (net of the
obsolescence reserves therefor shown in the financial statements included in the
Company SEC Documents and determined in the ordinary course of business
consistent with past practice) consist of items of merchantable quality and
quantity usable or salable in the ordinary course of business, are salable at
prevailing market prices that are not less than the book value amounts thereof
or the price customarily charged by the Company or the applicable Subsidiary
therefor, conform to the specifications established therefor, and have been
manufactured in accordance with applicable regulatory requirements, except to
the extent that the failure of such inventories so to consist, be

                                     -25-
<PAGE>

saleable, conform, or be manufactured would not have a Material Adverse Effect
on the Company.

          Section 4.22  Environmental Matters. (a) For purposes of this
Agreement, the following terms shall have the following meanings: (i) "Hazardous
Substances" means (A) petroleum and petroleum products, by-products or breakdown
products, radioactive materials, asbestos-containing materials and
polychlorinated biphenyls, and (B) any other chemicals, materials or substances
regulated as toxic or hazardous or as a pollutant, contaminant or waste or for
which liability or standards of care are imposed under any applicable
Environmental Law; (ii) "Environmental Law" means any law, past, present or
future and as amended, and any judicial or administrative interpretation
thereof, including any judicial or administrative order, consent decree or
judgment, or common law, relating to pollution or protection of the environment,
health or safety or natural resources, including those relating to the use,
handling, transportation, treatment, storage, disposal, release or discharge of
Hazardous Substances; and (iii) "Environmental Permit" means any permit,
approval, identification number, license or other authorization required under
any applicable Environmental Law.

          (b)  Except as disclosed in Section 4.22 of the Company Letter, the
Company and the Subsidiaries are and have been in compliance with all applicable
Environmental Laws, have obtained all Environmental Permits and are in
compliance with their requirements, and have resolved all past non-compliance
with Environmental Laws and Environmental Permits without any pending, on-going
or future obligation, cost or liability, except in each case for the notices set
forth in Section 4.22 of the Company Letter or where such non-compliance would
not, individually or in the aggregate, have a Material Adverse Effect on the
Company.

          (c)  Except as disclosed in Section 4.22 of the Company Letter,
neither the Company nor any of the Subsidiaries has (i) placed, held, located,
released, transported or disposed of any Hazardous Substances on, under, from or
at any of the Company's or any of the Subsidiaries' properties or any other
properties, nor caused any facts or conditions that could give rise to an
environmental claim, other than in a manner that would not, in all such cases
taken individually or in the aggregate, result in a Material Adverse Effect on
the Company, (ii) any Knowledge or reason to know of the presence of any
Hazardous Substances on, under, emanating from, or at any of the Company's or
any of the Subsidiaries' properties or any other property but arising from the
Company's or any of the Subsidiaries' current or former properties or
operations, other than in a manner that would not result in a Material Adverse
Effect on the Company, or (iii) any Knowledge, nor has it received any written
notice since October 1, 1996 (A) of any violation of or liability under any
Environmental Laws, (B) of the institution or pendency of any suit, action,
claim, proceeding or investigation by any Governmental Entity or any third party
in connection with any such violation or liability, (C) requiring the
investigation of, response to or remediation of Hazardous Substances at or
arising from any of the Company's or any of the Subsidiaries' current or former
properties or operations or any other properties, (D) alleging noncompliance by
the Company or any of the Subsidiaries with the terms of any Environmental

                                     -26-
<PAGE>

Permit in any manner reasonably likely to require material expenditures or to
result in material liability or (E) demanding payment for response to or
remediation of Hazardous Substances at or arising from any of the Company's or
any of the Subsidiaries' current or former properties or operations or any other
properties, except in each case for the notices set forth in Section 4.22 of the
Company Letter or where such violation, liability, action, noncompliance or
payment would not, individually or in the aggregate, have a Material Adverse
Effect on the Company.

          (d)  Except as disclosed in Section 4.22 of the Company Letter, no
Environmental Law imposes any obligation upon the Company or any of the
Subsidiaries arising out of or as a condition to any transaction contemplated by
this Agreement, including any requirement to modify or to transfer any permit or
license, any requirement to file any notice or other submission with any
Governmental Entity, the placement of any notice, acknowledgment or covenant in
any land records, or the modification of or provision of notice under any
agreement, consent order or consent decree.

          (e)  The Company and the Subsidiaries have provided Parent with copies
of any Environmental assessment or audit report or other similar studies or
analyses currently in the possession of or available to the Company or any of
the Subsidiaries relating to any real property currently or formerly owned,
leased or occupied by the Company or any of the Subsidiaries.

          Section 4.23  Suppliers, and Employees. Except as set forth in Section
4.23 of the Company Letter, neither the Company nor any Subsidiary has received
any notice or has any reason to believe that (a) any significant supplier will
not sell raw materials, supplies, merchandise and other goods to the Company or
any Subsidiary at any time after the Effective Time on terms and conditions
substantially similar to those used in its current sales to the Company and the
Subsidiaries, subject only to general and customary price increases, unless
comparable raw materials, supplies, merchandise or other goods are readily
available from other sources on comparable terms and conditions, or (b) any
employee or group of employees significant to Company, any of its Subsidiaries
or any of their operations intends to terminate or has terminated his or their
employment with the Company or any Subsidiary.

          Section 4.24  Insurance. All material fire and casualty, general
liability, business interruption, product liability, and sprinkler and water
damage insurance policies maintained by the Company or any of its Subsidiaries
are with reputable insurance carriers, provide full and adequate coverage for
all normal risks incident to the business of the Company and the Subsidiaries
and their respective properties and assets, and are in character and amount at
least equivalent to that carried by persons engaged in similar businesses and
subject to the same or similar perils or hazards, except for any such failures
to maintain insurance policies that, individually or in the aggregate, would not
have a Material Adverse Effect on the Company. The Company and each Subsidiary
have made any and all payments required to maintain such policies in full force
and effect. Except as set forth in Section 4.24 of the Company Letter, neither
the Company nor any Subsidiary has received notice of default under any such
policy, and has not received written notice or, to the Knowledge of the Company,
oral notice of any pending or threatened termination or cancellation, coverage
limitation or reduction or material premium increase with respect to such
policy.

                                     -27-
<PAGE>

          Section 4.25  Transactions with Affiliates.  (a) For purposes of this
Agreement, "Affiliated Person" means (i) any holder of 2% or more of the Company
Common Stock, (ii) any director, officer or senior executive of the Company or
any Subsidiary, (iii) any person, firm or corporation that directly or
indirectly controls, is controlled by, or is under common control with, any of
the Company or any Subsidiary or (iv) any member of the immediate family or any
of such persons, in each case other than Holdings or Parent or its Subsidiaries.

          (b)  Except as set forth in Section 4.25 of the Company Letter or in
the Company SEC Documents filed with the SEC prior to the date hereof, to the
Knowledge of the Company, since September 30, 1998, the Company and the
Subsidiaries have not, in the ordinary course of business or otherwise, (i)
purchased, leased or otherwise acquired any material property or assets or
obtained any material services from, (ii) sold, leased or otherwise disposed of
any material property or assets or provided any material services to (except
with respect to remuneration for services rendered in the ordinary course of
business as director, officer or employee of the Company or any Subsidiary),
(iii) entered into or modified in any manner any contract with, or (iv) borrowed
any money from, or made or forgiven any loan or other advance (other than
expenses or similar advances made in the ordinary course of business) to, any
Affiliated Person other than Parent.

          (c)  Except as set forth in Section 4.25 of the Company Letter or in
the Company SEC Documents filed with the SEC prior to the date hereof, to the
Knowledge of the Company, (i) the contracts of the Company and the Subsidiaries
do not include any material obligation or commitment between the Company or any
Subsidiary and any Affiliated Person, (ii) the assets of the Company or any
Subsidiary do not include any receivable or other obligation or commitment from
an Affiliated Person to the Company or any Subsidiary and (iii) the liabilities
of the Company and the Subsidiaries do not include any payable or other
obligation or commitment from the Company or any Subsidiary to any Affiliated
Person.

          (d)  To the Knowledge of the Company and except as set forth in
Section 4.25 of the Company Letter or in the Company SEC Documents filed with
the SEC prior to the date hereof, no Affiliated Person of any of the Company or
any Subsidiary is a party to any contract with any supplier of the Company or
any Subsidiary that affects in any material manner the business, financial
condition or results of operation of the Company or any Subsidiary.

          Section 4.26  Brokers. No broker, investment banker or other person,
other than U.S. Bancorp Piper Jaffray Inc. the fees and expenses of which will
be paid by the Company (as reflected in an agreement between U.S. Bancorp Piper
Jaffray Inc. and the Company, a copy of which has been furnished to Parent), is
entitled to any broker's, finder's or other similar fee or commission in
connection with the transactions contemplated by this Agreement based upon
arrangements made by or on behalf of the Company.

                                     -28-
<PAGE>

                                   ARTICLE V

                   COVENANTS RELATING TO CONDUCT OF BUSINESS
                   -----------------------------------------

          Section 5.1  Conduct of Business by the Company Pending the Merger.
Except as expressly permitted by clauses (i) through (xvii) of this Section 5.1,
during the period from the date of this Agreement through the Effective Time,
the Company shall, and shall cause each of its Subsidiaries to, in all material
respects carry on its business in the ordinary course of its business as
currently conducted and, to the extent consistent therewith, use reasonable best
efforts to preserve intact its current business organizations, keep available
the services of its current officers and employees and preserve its
relationships with customers, suppliers and others having business dealings with
it to the end that its goodwill and ongoing business shall be unimpaired at the
Effective Time. Without limiting the generality of the foregoing, and except as
otherwise expressly contemplated by this Agreement or as set forth in the
Company Letter (with specific reference to the applicable subsection below), the
Company shall not, and shall not permit any of its Subsidiaries to, without the
prior written consent of Parent:

          (i)  (A) other than dividends paid by wholly-owned Subsidiaries,
     declare, set aside or pay any dividends on, or make any other actual,
     constructive or deemed distributions in respect of, any of its capital
     stock, or otherwise make any payments to its stockholders in their capacity
     as such, (B) other than in the case of any Subsidiary, split, combine or
     reclassify any of its capital stock or issue or authorize the issuance of
     any other securities in respect of, in lieu of or in substitution for
     shares of its capital stock or (C) purchase, redeem or otherwise acquire
     any shares of capital stock of the Company or any other securities thereof
     or any rights, warrants or options to acquire any such shares or other
     securities;

          (ii)  issue, deliver, sell, pledge, dispose of or otherwise encumber
     any shares of its capital stock, any other voting securities or equity
     equivalent or any securities convertible into, or any rights, warrants or
     options (including options under the Company Stock Option Plans) to acquire
     any such shares, voting securities, equity equivalent or convertible
     securities, other than (A) the issuance of shares of Company Common Stock
     upon the exercise of Company Stock Options outstanding on the date of this
     Agreement in accordance with their current terms, (B) the issuance of
     shares of Company Common Stock upon exercise of the Warrants, and (C) the
     grant of purchase rights or issuance of Shares pursuant to the Company
     Stock Purchase Plan in accordance with Section 6.5 of this Agreement;

          (iii) amend its charter or by-laws;

          (iv)  acquire or agree to acquire by merging or consolidating with, or
     by purchasing a substantial portion of the assets of or equity in, or by
     any other manner, any business or any corporation, limited liability
     company, partnership, association or other business organization or
     division thereof or otherwise acquire or agree to acquire any assets;

                                     -29-
<PAGE>

          (v)    sell, lease or otherwise dispose of, or agree to sell, lease or
     otherwise dispose of, any of its assets with a fair market value in excess
     of $10,000, other than sales of inventory that are in the ordinary course
     of business consistent with past practice;

          (vi)   incur any indebtedness for borrowed money, guarantee any such
     indebtedness or make any loans, advances or capital contributions to, or
     other investments in, any other person, other than (A) in the ordinary
     course of business consistent with past practices and, in the case of
     indebtedness and guarantees, in an amount not to exceed $100,000 and (B)
     indebtedness, loans, advances, capital contributions and investments
     between the Company and any of its wholly-owned Subsidiaries or between any
     of such wholly-owned Subsidiaries, in each case in the ordinary course of
     business consistent with past practices;

          (vii)  alter (through merger, liquidation, reorganization,
     restructuring or in any other fashion) the corporate structure or ownership
     of the Company or any Subsidiary;

          (viii) except as provided in Section 5.1(viii) of the Company Letter
     and Section 6.5, enter into or adopt any, or amend any existing, severance
     plan, agreement or arrangement or enter into or amend any Company Plan or
     employment or consulting agreement;

          (ix)   except as provided in Section 5.1(ix) of the Company Letter and
     Section 6.5, increase the compensation payable or to become payable to its
     directors, officers or employees (except for increases in the ordinary
     course of business consistent with past practice in salaries or wages of
     employees of the Company or any of its Subsidiaries who are not officers of
     the Company or any of its Subsidiaries) or grant any severance or
     termination pay to, or enter into any employment or severance agreement
     with, any director or officer of the Company or any of its Subsidiaries, or
     establish, adopt, enter into, or, except as may be required to comply with
     applicable law, amend in any material respect or take action to enhance in
     any material respect or accelerate any rights or benefits under, any labor,
     collective bargaining, bonus, profit sharing, thrift, compensation, stock
     option, restricted stock, pension, retirement, deferred compensation,
     employment, termination, severance or other plan, agreement, trust, fund,
     policy or arrangement for the benefit of any director, officer or employee;

          (x)    knowingly violate or knowingly fail to perform any obligation
     or duty imposed upon it or any Subsidiary by any applicable material
     federal, state or local law, rule, regulation, guideline or ordinance;

          (xi)  make any change to accounting policies or procedures (other than
     actions required to be taken by generally accepted accounting principles);

          (xii)  prepare or file any Tax Return inconsistent with past practice
     or, on any such Tax Return, take any position, make any election, or adopt
     any method that is inconsistent with positions taken, elections made or
     methods used in preparing or filing similar Tax Returns in prior periods;

                                     -30-
<PAGE>

          (xiii) settle or compromise any Tax liability in excess of $100,000;

          (xiv)  settle or compromise any claims or litigation in excess of
     $100,000 or commence any litigation or proceedings;

          (xv)   enter into or amend any agreement or contract (i) having a term
     in excess of 12 months and which is not terminable by the Company or a
     Subsidiary without penalty or premium by notice of 60 days or less or (ii)
     which involves or is expected to involve payments of $100,000 or more
     during the term thereof (provided that in the case of agreements or
     contracts with any customer, the margins anticipated from any such
     agreement or contract shall be consistent in all material respects with
     historical margins); enter into or amend any other agreement or contract
     material to the Company and its Subsidiaries, taken as a whole; or purchase
     any real property, or make or agree to make any new capital expenditure or
     expenditures (other than the purchase of real property) which in the
     aggregate are in excess of $100,000;

          (xvi)  pay, discharge or satisfy any claims, liabilities or
     obligations (absolute, accrued, asserted or unasserted, contingent or
     otherwise), other than the payment, discharge or satisfaction of any such
     claims, liabilities or obligations in the ordinary course of business
     consistent with past practice or in accordance with their terms; or

          (xvii) authorize, recommend, propose or announce an intention to do
     any of the foregoing, or enter into any contract, agreement, commitment or
     arrangement to do any of the foregoing.

          Section 5.2  No Solicitation. (a) The Company shall not, nor shall it
permit any of its Subsidiaries to, nor shall it authorize or permit any officer,
director or employee of or any financial advisor, attorney or other advisor or
representative of, the Company or any of its Subsidiaries to, (i) solicit,
initiate or encourage the submission of, any Takeover Proposal, (ii) enter into
any agreement with respect to or approve or recommend any Takeover Proposal or
(iii) participate in any discussions or negotiations regarding, or furnish to
any person any information with respect to the Company or any Subsidiary in
connection with, or take any other action to facilitate any inquiries or the
making of any proposal that constitutes, or may reasonably be expected to lead
to, any Takeover Proposal; provided, however, that nothing contained in this
Section 5.2(a) shall prohibit the Company or its directors from (i) complying
with Rule 14e-2 promulgated under the Exchange Act with regard to a tender or
exchange offer or (ii) referring a third party to this Section 5.2(a) or making
a copy of this Section 5.2(a) available to any third party; and provided,
further, that prior to the acceptance for payment of Shares pursuant to the
Offer, if the Board of Directors of the Company reasonably determines that a
Takeover Proposal constitutes a Superior Proposal, then, to the extent required
by the fiduciary obligations of the Board of Directors of the Company, as
determined in good faith by a majority thereof after consultation with
independent counsel (who may be the Company's regularly engaged independent
counsel), the Company may, in response to an unsolicited request therefor, and
subject to compliance with Section 5.2(b), furnish information with respect to
the Company and its Subsidiaries to any person pursuant to a customary
confidentiality statement (as determined by

                                     -31-
<PAGE>

the Company's independent counsel) and participate in discussions or
negotiations with such person. Without limiting the foregoing, it is understood
that any violation of the restrictions set forth in the preceding sentence by
any officer or director of the Company or any of its Subsidiaries or any
financial advisor, attorney or other advisor or representative of the Company or
any of its Subsidiaries, whether or not such person is purporting to act on
behalf of the Company or any of its Subsidiaries or otherwise, shall be deemed
to be a breach of this Section 5.2(a) by the Company.

          (b)  The Company shall advise Parent orally and in writing of (i) any
Takeover Proposal or any inquiry with respect to or which could lead to any
Takeover Proposal received by any officer or director of the Company or, to the
Knowledge of the Company, any financial advisor, attorney or other advisor or
representative of the Company, (ii) the material terms of such Takeover Proposal
(including a copy of any written proposal), and (iii) the identity of the person
making any such Takeover Proposal or inquiry no later than 48 hours following
receipt of such Takeover Proposal or inquiry. If the Company intends to furnish
any Person with any information with respect to any Takeover Proposal in
accordance with Section 5.2(a), the Company shall advise Parent orally and in
writing of such intention not less than two business days in advance of
providing such information. The Company will keep Parent fully informed of the
status and material terms of any such Takeover Proposal or inquiry.

          Section 5.3  Third Party Standstill Agreements. During the period from
the date of this Agreement through the Effective Time, the Company shall not
terminate, amend, modify or waive any provision of any confidentiality or
standstill agreement to which the Company or any of its Subsidiaries is a party
(other than any involving Parent). During such period, the Company agrees to
enforce, to the fullest extent permitted under applicable law, the provisions of
any such agreements, including, but not limited to, obtaining injunctions to
prevent any breaches of such agreements and to enforce specifically the terms
and provisions thereof in any court of the United States or any state thereof
having jurisdiction.


                                  ARTICLE VI

                             ADDITIONAL AGREEMENTS
                             ---------------------

          Section 6.1  Stockholder Meeting. (a) The Company will duly call, give
notice of, convene and hold a meeting of stockholders (the "Stockholder
Meeting") for the purpose of considering the approval of this Agreement and at
such meeting call for a vote and cause proxies to be voted in respect of the
approval and adoption of this Agreement. The Stockholder Meeting shall be held
as soon as practicable following the purchase of Shares pursuant to the Offer,
and the Company will, through its Board of Directors, recommend to its
stockholders the approval of this Agreement, and shall not withdraw or modify
such recommendation. The record date for the Stockholder Meeting shall be a date
subsequent to the date Parent or Sub becomes a record holder of Company Common
Stock purchased pursuant to the Offer.

                                     -32-
<PAGE>

          (b)  The Company shall, at Parent's request, as soon as practicable
following the expiration of the Offer, prepare and file a preliminary Proxy
Statement with the SEC and shall use its reasonable best efforts to respond to
any comments of the SEC or its staff and to cause the Proxy Statement to be
mailed to the Company's stockholders as promptly as practicable after responding
to all such comments to the satisfaction of the staff. The Company shall notify
Parent promptly of the receipt of any comments from the SEC or its staff and of
any request by the SEC or its staff for amendments or supplements to the Proxy
Statement or for additional information and will supply Parent with copies of
all correspondence between the Company or any of its representatives, on the one
hand, and the SEC or its staff, on the other hand, with respect to the Proxy
Statement or the Merger. If at any time prior to the Stockholder Meeting there
shall occur any event that should be set forth in an amendment or supplement to
the Proxy Statement, the Company shall promptly prepare and mail to its
stockholders such an amendment or supplement. The Company shall not mail any
Proxy Statement, or any amendment or supplement thereto, to which Parent
reasonably objects. Parent shall cooperate with the Company in the preparation
of the Proxy Statement or any amendment or supplement thereto, including the
supply of any information required to be included in the Proxy Statement
regarding Parent or Sub.

          (c)  Parent agrees to cause all Shares purchased pursuant to the Offer
and all other Shares owned by Parent or any subsidiary of Parent to be voted in
favor of approval of the Merger.

          Section 6.2  Access to Information. Subject to currently existing
contractual and legal restrictions applicable to the Company or any of its
Subsidiaries, the Company shall, and shall cause each of its Subsidiaries to,
afford to the accountants, counsel, financial advisors and other representatives
of Parent reasonable access to, and permit them to make such inspections as they
may reasonably require of, during the period from the date of this Agreement
through the Effective Time, all of their respective properties, books,
contracts, commitments and records (including accounting records and Tax Returns
and the work papers of independent accountants, if available and subject to the
consent of such independent accountants) and, during such period, the Company
shall, and shall cause each of its Subsidiaries to (i) furnish promptly to
Parent a copy of each report, schedule, registration statement and other
document filed by it during such period pursuant to the requirements of federal
or state securities laws, (ii) furnish promptly to Parent all other information
concerning its business, properties and personnel as Parent may reasonably
request and (iii) promptly make available to Parent all personnel of the Company
and its Subsidiaries knowledgeable about matters relevant to such inspections.
No investigation pursuant to this Section 6.2 shall affect any representation or
warranty in this Agreement of any party hereto or any condition to the
obligations of the parties hereto. All information obtained by Parent pursuant
to this Section 6.2 shall be kept confidential in accordance with the
Confidentiality Agreement dated June 2, 1999 between Parent and the Company, as
amended (the "Confidentiality Agreement").

          Section 6.3  Directors. Promptly after such time as Sub purchases
Shares pursuant to the Offer, Sub shall be entitled, to the fullest extent
permitted by law, to designate at its option up to that number of directors,
rounded to the nearest whole number, of the Company's Board of Directors,
subject to compliance with Section 14(f) of the Exchange Act, as will make the

                                     -33-
<PAGE>

percentage of the Company's directors designated by Sub equal to the percentage
of the aggregate voting power of the shares of Common Stock held by Parent or
any of its Subsidiaries; provided, however, that in the event that Sub's
designees are elected to the Board of Directors of the Company, until the
Effective Time such Board of Directors shall have at least three directors who
are directors on the date of this Agreement and who are not officers of the
Company (the "Independent Directors"); and provided further that, in such event,
if the number of Independent Directors shall be reduced below three for any
reason whatsoever, the remaining Independent Directors or Director shall
designate a person or persons to fill such vacancy or vacancies, each of whom
shall be deemed to be an Independent Director for purposes of this Agreement or,
if no Independent Directors then remain, the other directors shall designate
three persons to fill such vacancies who shall not be officers or affiliates of
the Company or any of its subsidiaries, or officers or affiliates of Parent or
any of its subsidiaries, and such persons shall be deemed to be Independent
Directors for purposes of this Agreement. Following the election or appointment
of Sub's designees pursuant to this Section 6.3 and prior to the Effective Time,
any amendment, or waiver of any term or condition, of this Agreement or the
Company Charter or the Amended and Restated By-Laws of the Company, any
termination of this Agreement by the Company, any extension by the Company of
the time for the performance of any of the obligations or other acts of Sub or
waiver or assertion of any of the Company's rights hereunder, and any other
consent or action by the Board of Directors of the Company with respect to this
Agreement, will require the concurrence of a majority of the Independent
Directors and no other action by the Company, including any action by any other
director of the Company, shall be required for purposes of this Agreement. To
the fullest extent permitted by applicable law, the Company shall take all
action requested by Parent that is reasonably necessary to effect any such
election, including mailing to its stockholders the Information Statement
containing the information required by Section 14(f) of the Exchange Act and
Rule 14f-1 promulgated thereunder, and the Company agrees to make such mailing
with the mailing of the Schedule 14D-9 (provided that Sub shall have provided to
the Company on a timely basis all information required to be included in the
Information Statement with respect to Sub's designees). In connection with the
foregoing, the Company will promptly, at the option of Parent, to the fullest
extent permitted by law, either increase the size of the Company's Board of
Directors and/or obtain the resignation of such number of its current directors
as is necessary to enable Sub's designees to be elected or appointed to the
Company's Board of Directors as provided above.

          Section 6.4  Fees and Expenses. (a) Except as provided in this Section
6.4 and Section 6.8, whether or not the Merger is consummated, all costs and
expenses incurred in connection with this Agreement and the transactions
contemplated hereby, including the fees and disbursements of counsel, financial
advisors and accountants, shall be paid by the party incurring such costs and
expenses.

          (b)  The Company shall pay, or cause to be paid, in same day funds to
Parent the following amounts under the circumstances and at the times set forth
as follows:

          (i)  if Parent or Sub terminates this Agreement under Section 8.1(d),
     the Company shall pay the Expenses of Parent and the Termination Fee upon
     demand; or

                                     -34-
<PAGE>

          (ii)  if the Company terminates this Agreement under Section 8.1(e),
     the Company shall pay the Termination Fee within one business day following
     such termination and the Expenses of Parent upon demand.

          Section 6.5  Company Stock Options. (a) Prior to the consummation of
the Offer, the Board of Directors of the Company (or, if appropriate, any
committee thereof) shall adopt appropriate resolutions and take all other
actions necessary or appropriate to cause each Company Stock Option that is
outstanding as of the consummation of the Offer to vest in full and become
exercisable immediately prior to the consummation of the Offer with respect to
all of the shares of Company Common Stock at the time subject to such Company
Stock Option. Each Company Stock Option that is outstanding upon the
consummation of the Offer shall be canceled as of the consummation of the Offer,
in consideration for which the holder thereof (an "Option Holder") shall be
entitled to receive from the Company an amount equal to (A) the product of (1)
the number of shares of Company Common Stock subject to such Option and (2) the
excess, if any, of the Offer Price over the exercise price per share for the
purchase of the Company Common Stock subject to such Option, minus (B) all
applicable federal, state and local Taxes required to be withheld in respect of
such payment. The amounts payable pursuant to the second sentence of this
Section 6.5 shall be paid as soon as reasonably practicable following the
acceptance for payment by Sub pursuant to the Offer. The surrender of an Option
in exchange for the consideration contemplated by the second sentence of this
Section 6.5 shall be deemed a release of any and all rights the Option Holder
had or may have had in respect thereof.

          (b)  The Company shall take all actions necessary to ensure that  (i)
the Purchase Period (as defined in the Company Stock Purchase Plan) applicable
to the options outstanding under the Company Stock Purchase Plan (each, a
"Purchase Plan Option") is shortened so as to have a Purchase Date (as defined
in the Company Stock Purchase Plan) that occurs before the acceptance for
payment by Sub of Shares pursuant to the Offer; and (ii) no current holder of a
Purchase Plan Option is permitted to increase his or her rate of payroll
deduction under the Company Stock Purchase Plan from and after the date hereof.

          (c)  The Company shall take all actions necessary to provide that,
effective as of acceptance for payment by Sub of Shares pursuant to the Offer,
(i) the Company Stock Option Plan and any similar plan or agreement of the
Company shall be terminated, (ii) any rights under any other plan, program,
agreement or arrangement relating to the issuance or grant of any other interest
in respect of the capital stock of the Company or any of its Subsidiaries shall
be terminated, and (iii) no Option Holder will have any right to receive any
shares of capital stock of the Company or, if applicable, the Surviving
Corporation, upon exercise of any Company Stock Option.

          (d)  The Company represents and warrants that it has the power and
authority under the terms of the Company Stock Purchase Plan and the Company
Stock Option Plan to comply with this Section 6.5 without the consent of any
Option Holder.

          Section 6.6  Warrants. Prior to the acceptance for payment of any
Shares by Sub pursuant to the Offer, the Company will obtain written
confirmation, in form and substance

                                     -35-
<PAGE>

reasonably satisfactory to Parent, from the holders of each of the Pilla Warrant
and the Chiabera Warrant that after the Effective Time of the Merger such
Warrant will represent the right to receive an amount equal to (A) the product
of (1) the number of shares of Company Common Stock subject to such Warrant and
(2) the excess, if any, of the Merger Consideration over the Exercise Price (as
defined in such Warrant) per share for the purchase of the Company Common Stock
subject to such Warrant, minus (B) all applicable federal, state and local Taxes
required to be withheld in respect of such payment.

          Section 6.7  Reasonable Best Efforts. (a) Upon the terms and subject
to the conditions set forth in this Agreement, each of the parties agrees to use
reasonable best efforts to take, or cause to be taken, all actions, and to do,
or cause to be done, and to assist and cooperate with the other parties in
doing, all things necessary, proper or advisable to consummate and make
effective, in the most expeditious manner practicable, the Offer, the Merger and
the other transactions contemplated by this Agreement, including: (i) the
obtaining of all necessary actions or non-actions, waivers, consents and
approvals from all Governmental Entities and the making of all necessary
registrations and filings (including filings with Governmental Entities) and the
taking of all reasonable steps as may be necessary to obtain an approval or
waiver from, or to avoid an action or proceeding by, any Governmental Entity
(including those in connection with the HSR Act, any other pre-merger filings
and State Takeover Approvals), (ii) the obtaining of all necessary consents,
approvals or waivers from third parties, (iii) the defending of any lawsuits or
other legal proceedings, whether judicial or administrative, challenging this
Agreement or the consummation of the transactions contemplated hereby, including
seeking to have any stay or temporary restraining order entered by any court or
other Governmental Entity vacated or reversed, and (iv) the execution and
delivery of any additional instruments necessary to consummate the transactions
contemplated by this Agreement. No party to this Agreement shall consent to any
voluntary delay of the consummation of the Offer or the Merger at the behest of
any Governmental Entity without the consent of the other parties to this
Agreement, which consent shall not be unreasonably withheld.

          (b)  Each party shall use all reasonable best efforts to not take any
action, or enter into any transaction, which would cause any of its
representations or warranties contained in this Agreement to be untrue or result
in a breach of any covenant made by it in this Agreement.

          (c)  Notwithstanding anything to the contrary contained in this
Agreement, in connection with any filing or submission required or action to be
taken by either Parent or the Company to effect the Offer, the Merger and to
consummate the other transactions contemplated hereby, the Company shall not,
without Parent's prior written consent, commit to any divestiture transaction,
and neither Parent nor any of its Affiliates shall be required to divest or hold
separate or otherwise take or commit to take any action that limits its freedom
of action with respect to, or its ability to retain, the Company or any of the
businesses, product lines or assets of Parent or any of its Subsidiaries or that
otherwise would have a Material Adverse Effect on Parent.

          Section 6.8  Public Announcements. Parent and the Company will not
issue any press release with respect to the transactions contemplated by this
Agreement or otherwise issue any written public statements with respect to such
transactions without prior consultation with the

                                     -36-
<PAGE>

other party, except as may be required by applicable law or by obligations
pursuant to any listing agreement with any national securities exchange.

          Section 6.9  State Takeover Laws. If any "fair price," "business
combination" or "control share acquisition" statute or other similar statute or
regulation shall become applicable to the transactions contemplated hereby or
the Stockholder Agreements, Parent and the Company and their respective Boards
of Directors shall use their reasonable best efforts to grant such approvals and
take such actions as are necessary so that the transactions contemplated hereby
may be consummated as promptly as practicable on the terms contemplated hereby
and otherwise act to minimize the effects of any such statute or regulation on
the transactions contemplated hereby.

          Section 6.10  Indemnification; Directors and Officers Insurance. (a)
From and after the Effective Time, Parent shall cause the Surviving Corporation
to indemnify and hold harmless all past and present officers and directors of
the Company and of its Subsidiaries to the same extent and in the same manner
such persons are indemnified as of the date of this Agreement by the Company
pursuant to the DGCL, the Company Charter or the Company's Amended and Restated
Bylaws for acts or omissions occurring at or prior to the Effective Time.

          (b)  Parent shall cause the Surviving Corporation to provide, for an
aggregate period of not less than six years from the Effective Time, the
Company's current directors and officers an insurance and indemnification policy
that provides coverage for events occurring prior to the Effective Time (the
"D&O Insurance") that is substantially similar to the Company's existing policy
or, if substantially equivalent insurance coverage is unavailable, the best
available coverage; provided, however, that the Surviving Corporation shall not
be required to pay an annual premium for the D&O Insurance in excess of 150% of
the last annual premiums paid prior to the date hereof (which premiums the
Company has disclosed to Parent), but in such case shall purchase as much
coverage as possible for such amount.

          Section 6.11  Notification of Certain Matters. Parent shall use its
reasonable best efforts to give prompt notice to the Company, and the Company
shall use its reasonable best efforts to give prompt notice to Parent, of: (i)
the occurrence, or non-occurrence, of any event the occurrence, or non-
occurrence, of which it is aware and which would be reasonably likely to cause
(x) any representation or warranty contained in this Agreement and made by it to
be untrue or inaccurate in any material respect or (y) any covenant, condition
or agreement contained in this Agreement and made by it not to be complied with
or satisfied in all material respects, (ii) any failure of Parent or the
Company, as the case may be, to comply in a timely manner with or satisfy any
covenant, condition or agreement to be complied with or satisfied by it
hereunder or (iii) any change or event which would be reasonably likely to have
a Material Adverse Effect on the Company; provided, however, that the delivery
of any notice pursuant to this Section 6.11 shall not limit or otherwise affect
the remedies available hereunder to the party receiving such notice.

                                     -37-
<PAGE>

                                  ARTICLE VII

                      CONDITIONS PRECEDENT TO THE MERGER
                      ----------------------------------

          Section 7.1  Conditions to Each Party's Obligation to Effect the
Merger. The respective obligations of each party to effect the Merger shall be
subject to the fulfillment at or prior to the Effective Time of the following
conditions:

          (a)  Stockholder Approval. This Agreement (including the Merger) shall
have been approved and adopted by the affirmative vote of the stockholders of
the Company (unless the vote of stockholders is not required under the DGCL) as
required by the DGCL and the Company Charter.

          (b)  HSR Act and Other Pre-Merger Filings. Any waiting period (and any
extension thereof) applicable to the consummation of the Merger under the HSR
Act or any other waiting periods under applicable foreign laws shall have
expired or been terminated.

          (c)  Purchase of Shares. Sub shall have previously accepted for
payment and paid for Shares pursuant to the Offer, except that this condition
shall not apply if Sub shall have failed to purchase Shares pursuant to the
Offer in breach of its obligations under this Agreement.

          (d)  No Order. No court or other Governmental Entity having
jurisdiction over the Company or Parent, or any of their respective
Subsidiaries, shall have enacted, issued, promulgated, enforced or entered any
law, rule, regulation, executive order, decree, injunction or other order
(whether temporary, preliminary or permanent) which is then in effect and has
the effect of making the Merger illegal.


                                 ARTICLE VIII

                       TERMINATION, AMENDMENT AND WAIVER
                       ---------------------------------

          Section 8.1  Termination. This Agreement may be terminated at any time
prior to the Effective Time, whether before or after approval of this Agreement
by the stockholders of the Company:

          (a)  by mutual written consent of Parent and the Company;

          (b)  by either Parent or the Company:

               (i)  if (x) as a result of the failure of any of the Offer
          Conditions the Offer shall have terminated or expired in accordance
          with its terms without Sub having accepted for payment any Shares
          pursuant to the Offer or (y) Sub shall not have accepted for payment
          any Shares pursuant to the Offer prior to October 31, 1999; provided,
          however, that the right to terminate this Agreement pursuant to this

                                     -38-
<PAGE>

          Section 8.1(b)(i) shall not be available to any party whose failure to
          perform any of its obligations under this Agreement results in the
          failure of any such condition or if the failure of such condition
          results from facts or circumstances that constitute a breach of any
          representation or warranty under this Agreement by such party; or

               (ii)  if any Governmental Entity shall have issued an order,
          decree or ruling or taken any other action permanently enjoining,
          restraining or otherwise prohibiting the acceptance for payment of, or
          payment for, Shares pursuant to the Offer and such order, decree or
          ruling or other action shall have become final and nonappealable;

          (c)  by Parent or Sub prior to the purchase of Shares pursuant to the
     Offer in the event of a breach by the Company of any representation,
     warranty, covenant or other agreement contained in this Agreement which (i)
     would give rise to the failure of a condition set forth in paragraph (e) or
     (f) of Exhibit B and (ii) cannot be or has not been cured within 30 days
     after the giving of written notice to the Company;

          (d)  by Parent or Sub if either Parent or Sub is entitled to terminate
     the Offer as a result of the occurrence of any event set forth in paragraph
     (d) of Exhibit B;

          (e)  by the Company if the Board of Directors of the Company
     reasonably determines that a Takeover Proposal constitutes a Superior
     Proposal and a majority of the members of the Board of Directors
     determines, in its reasonable good faith judgment, after consultation with
     independent counsel, that failing to terminate this Agreement would
     constitute a breach of such Board's fiduciary duties under applicable law,
     provided that the Company has complied with all provisions of Section 5.2,
     including the notice provisions therein, and that it has complied with the
     requirements of Section 6.4(b) relating to the payment (including the
     timing of any payment) of the Expenses and the Termination Fee to the
     extent required by Section 6.4(b); and provided further that the Company
     may not terminate this Agreement pursuant to this Section 8.1(e) unless and
     until 72 hours have elapsed following delivery to Parent of a written
     notice of such determination by the Board of Directors of the Company;

          (f)  by the Company, if (i) any of the representations or warranties
     of Parent or Sub set forth in this Agreement that are qualified as to
     materiality shall not be true and correct in any respect or any such
     representations or warranties that are not so qualified shall not be true
     and correct in any material respect, or (ii) Parent or Sub shall have
     failed to perform in any material respect any material obligation or to
     comply in any material respect with any material agreement or covenant of
     Parent or Sub to be performed or complied with by it under this Agreement
     and such untruth, incorrectness or failure cannot be or has not been cured
     within 30 days after the giving of written notice to Parent or Sub, as
     applicable; or

          (g)  by the Company, if the Offer has not been timely commenced in
     accordance with Section 1.1.

                                     -39-
<PAGE>

          The right of any party hereto to terminate this Agreement pursuant to
this Section 8.1 shall remain operative and in full force and effect regardless
of any investigation made by or on behalf of any party hereto, any person
controlling any such party or any of their respective officers or directors,
whether prior to or after the execution of this Agreement.

          Section 8.2  Effect of Termination. In the event of termination of
this Agreement by either Parent or the Company, as provided in Section 8.1, this
Agreement shall forthwith become void and there shall be no liability hereunder
on the part of the Company, Parent, Sub or their respective officers or
directors (except for the last sentence of Section 6.2 and the entirety of
Section 6.4, which shall survive the termination); provided, however, that
nothing contained in this Section 8.2 shall relieve any party hereto from any
liability for any breach of a representation or warranty contained in this
Agreement, the breach of any covenant contained in this Agreement or for fraud.

          Section 8.3  Amendment. This Agreement may be amended by the parties
hereto, by or pursuant to action taken by their respective Boards of Directors,
at any time before or after approval of the matters presented in connection with
the Merger by the stockholders of the Company, but, after any such approval, no
amendment shall be made which by law requires further approval by such
stockholders without such further approval. This Agreement may not be amended
except by an instrument in writing signed on behalf of each of the parties
hereto.

          Section 8.4  Waiver. At any time prior to the Effective Time, subject
to Section 6.3, the parties hereto may (i) extend the time for the performance
of any of the obligations or other acts of the other parties hereto, (ii) waive
any inaccuracies in the representations and warranties contained herein or in
any document delivered pursuant hereto and (iii) waive compliance with any of
the agreements or conditions contained herein which may legally be waived. Any
agreement on the part of a party hereto to any such extension or waiver shall be
valid only if set forth in an instrument in writing signed on behalf of such
party.


                                  ARTICLE IX

                               GENERAL PROVISIONS
                               ------------------

          Section 9.1  Non-Survival of Representations and Warranties. The
representations and warranties in this Agreement or in any instrument delivered
pursuant to this Agreement shall terminate at the Effective Time.

          Section 9.2  Notices. All notices and other communications hereunder
shall be in writing and shall be deemed given when delivered personally, one day
after being delivered to an overnight courier or when telecopied (with a
confirmatory copy sent by overnight courier) to the parties at the following
addresses (or at such other address for a party as shall be specified by like
notice):

                                     -40-
<PAGE>

          (a)  if to Parent or Sub, to:

               Smith & Nephew, Inc.
               1450 Brooks Road
               Memphis, Tennessee 38116
               Attention: President, Orthopedic Division

               with copies to:

               Smith & Nephew, Inc.
               1450 Brooks Road
               Memphis, Tennessee 38116
               Attention: General Counsel
               Facsimile No.: 901-396-7824

               and

               Sidley & Austin
               One First National Plaza
               Chicago, Illinois 60603
               Attention: Dennis V. Osimitz
               Facsimile No.: 312-853-7036

          (b)  if to the Company, to:

               Exogen, Inc.
               10 Constitution Ave.
               Piscataway, New Jersey 08855
               Attention: Patrick A. McBrayer
               Facsimile No.: 732-981-0648

               with a copy to:

               Brobeck, Phleger & Harrison LLP
               1633 Broadway
               New York, New York
               Attention: Ellen B. Corenswet
               Facsimile No.: 212-586-7878

          Section 9.3  Interpretation; Certain Definitions.  (a) When a
reference is made in this Agreement to a Section, such reference shall be to a
Section of this Agreement unless otherwise indicated.  The table of contents and
headings contained in this Agreement are for reference purposes only and shall
not affect in any way the meaning or interpretation of this Agreement.  Whenever
the words "include," "includes" or "including" are used in this Agreement, they
shall be deemed to be followed by the words "without limitation."

                                     -41-
<PAGE>

          (b)  For purposes of this Agreement, the following terms have the
meaning specified in this Section 9.3:

          "Code" means the Internal Revenue Code of 1986, as amended.

          "ERISA" means the Employee Retirement Income Security Act of 1974, as
amended.

          "Expenses" means documented out-of-pocket fees and expenses incurred
or paid by or on behalf of Parent in connection with the Offer, the Merger or
the consummation of any of the transactions contemplated by this Agreement,
including all fees and expenses of law firms, commercial banks, investment
banking firms, accountants, experts and consultants to Parent.

          "Knowledge of the Company" means the actual knowledge of the directors
and executive officers of the Company.

          "Material Adverse Change" or "Material Adverse Effect" means, when
used with respect to the Company or Parent, as the case may be, any change or
effect that is or could reasonably be expected (as far as can be foreseen at the
time) to be materially adverse to the business, operations, properties or
results of operations, financial projections or forecasts, or the business
prospects and condition (financial or otherwise), with all such matters being
considered in the aggregate, of the Company and its Subsidiaries, taken as a
whole, or Parent and its Subsidiaries, taken as a whole, as the case may be.

          "Real Estate" means, with respect to the Company or any Subsidiary, as
applicable, all of the fee or leasehold ownership right, title and interest of
such person, in and to all real estate and improvement owned or leased by any
such person and which is used by any such person in connection with the
operation of its business.

          "Subsidiary" means any corporation, partnership, limited liability
company, joint venture or other legal entity of which Parent or the Company, as
the case may be (either alone or through or together with any other Subsidiary),
owns, directly or indirectly, 50% or more of the stock or other equity interests
the holders of which are generally entitled to vote for the election of the
board of directors or other governing body of such corporation, partnership,
limited liability company, joint venture or other legal entity.

          "Superior Proposal" means a bona fide proposal made by a third party
to acquire the Company pursuant to a tender or exchange offer, a merger, a sale
of all or substantially all of the Company's assets or otherwise on terms which
a majority of the disinterested members of the Board of Directors of the Company
determines, at a duly constituted meeting of the Board of Directors or by
unanimous written consent, in its reasonable good faith judgment to be more
favorable to the Company's stockholders than the Merger (based on the advice of
the Company's

                                     -42-
<PAGE>

independent financial advisor that the value of the consideration provided for
in such proposal exceeds the value of the consideration provided for in the
Merger) and for which financing, to the extent required, is then committed or
which, in the reasonable good faith judgment of a majority of such disinterested
members, as expressed in a resolution adopted at a duly constituted meeting of
such members (based on the advice of the Company's independent financial
advisor), is reasonably capable of being obtained by such third party.

          "Takeover Proposal" means any proposal for (i) a merger or other
business combination involving the Company or any of its Subsidiaries, (ii) any
proposal or offer to acquire in any manner, directly or indirectly, an equity
interest in or any voting securities of the Company representing 15% or more of
the Shares or of the total voting securities of the Company outstanding or (iii)
an offer to acquire in any manner, directly or indirectly, a substantial portion
of the assets of the Company or any of its Subsidiaries, other than the
transactions contemplated by this Agreement.

          "Taxes" means any federal, state, local or foreign income, gross
receipts, property, sales, use, license, excise, franchise, employment, payroll,
withholding, alternative or add-on minimum, ad valorem, value-added, transfer or
excise tax, or other tax, custom, duty, governmental fee or any other like
assessment or charge of any kind whatsoever, together with any interest or
penalty imposed by any Governmental Entity.

          "Tax Return" means any return, report or similar statement (including
the attached schedules) required to be filed with respect to any Tax, including
any information return, claim for refund, amended return or declaration of
estimated Tax.

          "Termination Fee" means $2,500,000.

          Section 9.4  Counterparts.  This Agreement may be executed in
counterparts, all of which shall be considered one and the same agreement, and
shall become effective when one or more counterparts have been signed by each of
the parties and delivered to the other parties.

          Section 9.5  Entire Agreement; No Third-Party Beneficiaries.  This
Agreement, except as provided in the last sentence of Section 6.2, constitutes
the entire agreement and supersedes all prior agreements and understandings,
both written and oral, among the parties with respect to the subject matter
hereof.  This Agreement, except for the provisions of Section 6.10, is not
intended to confer upon any person other than the parties hereto any rights or
remedies hereunder.

          Section 9.6  Governing Law.  Except to the extent that the laws of the
State of Delaware are mandatorily applicable to the Merger, this Agreement shall
be governed by, and construed in accordance with, the laws of the State of New
York, regardless of the laws that might otherwise govern under applicable
principles of conflicts of laws thereof.

                                     -43-
<PAGE>

          Section 9.7  Assignment.  Subject to Section 2.1, neither this
Agreement nor any of the rights, interests or obligations hereunder shall be
assigned by any of the parties hereto (whether by operation of law or otherwise)
without the prior written consent of the other parties.

          Section 9.8  Severability.  If any term or other provision of this
Agreement is invalid, illegal or incapable of being enforced by any rule of law,
or public policy, all other terms, conditions and provisions of this Agreement
shall nevertheless remain in full force and effect so long as the economic and
legal substance of the transactions contemplated hereby are not affected in any
manner materially adverse to any party.  Upon such determination that any term
or other provision is invalid, illegal or incapable of being enforced, the
parties shall negotiate in good faith to modify this Agreement so as to effect
the original intent of the parties as closely as possible in a mutually
acceptable manner in order that the transactions contemplated by this Agreement
may be consummated as originally contemplated to the fullest extent possible.

          Section 9.9  Enforcement of this Agreement.  The parties hereto agree
that irreparable damage would occur in the event that any of the provisions of
this Agreement were not performed in accordance with their specific wording or
were otherwise breached.  It is accordingly agreed that the parties hereto shall
be entitled to an injunction or injunctions to prevent breaches of this
Agreement and to enforce specifically the terms and provisions hereof, such
remedy being in addition to any other remedy to which any party is entitled at
law or in equity.  Each party hereby irrevocably submits to the exclusive
jurisdiction of the United States District Court for the District of Delaware in
any action, suit or proceeding arising in connection with this Agreement, and
agrees that any such action, suit or proceeding shall be brought only in such
courts (and waives any objection based on forum non conveniens or any other
objection to venue therein).  Each party hereto waives any right to a trial by
jury in connection with any such action, suit or proceeding.

                                     -44-
<PAGE>

          IN WITNESS WHEREOF, Parent, Sub and the Company have caused this
Agreement to be signed by their respective officers thereunto duly authorized
all as of the date first written above.

                              SMITH & NEPHEW, INC.



                              By:  /s/  Clifford K. Lomax
                                  ----------------------------
                              Name:  Clifford K. Lomax
                                    --------------------------
                              Title:  Treasurer
                                     -------------------------


                              SMITH & NEPHEW ACQUISITION, INC.


                              By:  /s/  Clifford K. Lomax
                                  ----------------------------
                              Name:  Clifford K. Lomax
                                    --------------------------
                              Title:  Chairman
                                     -------------------------



                              EXOGEN, INC.


                              By:  /s/  Patrick A. McBrayer
                                  ----------------------------
                              Name:  Patrick A. McBrayer
                                    --------------------------
                              Title:  President and CEO
                                     -------------------------


                                     -45-
<PAGE>

                                                                       Exhibit A
                                                                       ---------


                             STOCKHOLDER AGREEMENT
                             ---------------------


          STOCKHOLDER AGREEMENT (this "Agreement"), dated as of _____, 1999,
among Smith & Nephew, Inc., a Delaware corporation ("Parent"), Smith & Nephew
Acquisition, Inc., a Delaware corporation and a wholly owned subsidiary of
Parent ("Sub"), and the undersigned stockholder (the "Stockholder") of Exogen,
Inc.,  a Delaware corporation (the "Company").


          WHEREAS, Parent, Sub and the Company, propose to enter into an
Agreement and Plan of Merger dated as of even date herewith (as the same may be
amended or supplemented, the "Merger Agreement") to provide for the making of a
cash tender offer (as such offer may be amended from time to time, the "Offer")
by Sub for any and all shares of Common Stock, par value $.0001 per share, of
the Company (the "Common Stock") at the Offer Price (as defined in the Merger
Agreement) and the merger of the Company and Sub (the "Merger");

          WHEREAS, the Stockholder legally and/or beneficially owns that number
of shares of Common Stock appearing on the signature page hereof (such shares,
as they may be adjusted by any stock dividend, stock split, recapitalization,
combination or exchange of shares, merger, consolidation, reorganization or
other change or transaction of or by the Company (each, an "Adjustment Event")
being referred to herein as the "Subject Shares");  and

          WHEREAS, as a condition to their willingness to enter into the Merger
Agreement, Parent and Sub have requested that the Stockholder enter into this
Agreement;

          NOW, THEREFORE, to induce Parent and Sub to enter into, and in
consideration of their entering into, the Merger Agreement, and in consideration
of the premises and the representations, warranties and agreements contained
herein, the parties agree as follows:

          1.   Representations and Warranties of the Stockholder.  The
Stockholder hereby represents and warrants to Parent and Sub as follows:

          (a)  Authority.  The Stockholder has all requisite power and authority
     to enter into this Agreement and to consummate the transactions
     contemplated hereby.  This Agreement has been duly authorized, executed and
     delivered by the Stockholder and constitutes a valid and binding obligation
     of the Stockholder enforceable in accordance with its terms.  The execution
     and delivery of this Agreement does not, and the consummation of the
     transactions contemplated hereby and compliance with the terms hereof will
     not, conflict with, or result in any violation of, or default (with or
     without

<PAGE>

     notice or lapse of time or both) under any provision of, any trust
     agreement, loan or credit agreement, note, bond, mortgage, indenture, lease
     or other agreement, instrument, permit, concession, franchise, license,
     judgment, order, notice, decree, statute, law, ordinance, rule or
     regulation applicable to the Stockholder or to the Stockholder's property
     or assets. Except for the expiration or termination of the waiting period
     under the HSR Act and informational filings with the SEC, no consent,
     approval, order or authorization of, or registration, declaration or filing
     with, any court, administrative agency or commission or other governmental
     authority or instrumentality, domestic, foreign or supranational, is
     required by or with respect to the Stockholder in connection with the
     execution and delivery of this Agreement or the consummation by the
     Stockholder of the transactions contemplated hereby.

          (b)  The Shares.  The Stockholder has good and marketable title to the
     Subject Shares, free and clear of any claims, liens, encumbrances and
     security interests whatsoever.  The Stockholder owns no shares of Common
     Stock other than the Subject Shares.

          2.   Representations and Warranties of Parent and Sub.
               ------------------------------------------------

          (a)  Authority.  Parent and Sub hereby represent and warrant to the
     Stockholder that each of Parent and Sub has all requisite corporate power
     and authority to enter into this Agreement and to consummate the
     transactions contemplated hereby. The execution and delivery of this
     Agreement by Parent and Sub, and the consummation of the transactions
     contemplated hereby, have been duly authorized by all necessary corporate
     action on the part of Parent and Sub.  This Agreement has been duly
     executed and delivered by Parent and Sub and constitutes a valid and
     binding obligation of Parent and Sub enforceable in accordance with its
     terms.

          3.   Covenants of the Stockholder.  The Stockholder agrees as follows:
               ----------------------------

          (a)  At any meeting of stockholders of the Company called to vote upon
     the Merger and the Merger Agreement or at any adjournment thereof or in any
     other circumstances upon which a vote, consent or other approval with
     respect to the Merger and the Merger Agreement is sought, the Stockholder
     shall vote (or cause to be voted) the Subject Shares in favor of the
     Merger, the approval of the Merger Agreement and the approval of the terms
     thereof and each of the other transactions contemplated by the Merger
     Agreement, provided that the terms of the Merger Agreement shall not have
     been amended to adversely affect the Stockholder.

          (b)  At any meeting of stockholders of the Company or at any
     adjournment thereof or in any other circumstances upon which the
     Stockholder's vote, consent or other approval is sought, the Stockholder
     shall vote (or cause to be voted) the Subject Shares against (i) any merger
     agreement or merger (other than the Merger Agreement and the


                                      -2-
<PAGE>

     Merger), consolidation, combination, sale of substantial assets,
     reorganization, recapitalization, dissolution, liquidation or winding up of
     or by the Company or any other Takeover Proposal or (ii) any amendment of
     the Company's articles of incorporation or by-laws or other proposal or
     transaction involving the Company or any of its subsidiaries, which
     amendment or other proposal or transaction would in any manner impede,
     frustrate, prevent or nullify the Merger, the Merger Agreement or any of
     the other transactions contemplated by the Merger Agreement.

          (c)  The Stockholder agrees not to (i) sell, transfer, pledge, assign
     or otherwise dispose of, or enter into any contract, option or other
     arrangement (including any profit sharing arrangement) with respect to the
     sale, transfer, pledge, assignment or other disposition of, the Subject
     Shares to any person other than Sub or Sub's designee or (ii) enter into
     any voting arrangement, whether by proxy, voting agreement or otherwise, in
     connection, directly or indirectly, with any Takeover Proposal.

          (d)  The Stockholder shall not, nor shall the Stockholder permit any
     investment banker, attorney or other adviser or representative of the
     Stockholder to, (i) directly or indirectly solicit, initiate or encourage
     the submission of, any Takeover Proposal or (ii) directly or indirectly
     participate in any discussions or negotiations regarding, or furnish to any
     person any information with respect to, or take any other action to
     facilitate any inquiries or the making of any proposal that constitutes, or
     may reasonably be expected to lead to, any Takeover Proposal.

          (e)  So long as the Merger Agreement has not been terminated, the
     Stockholder shall tender pursuant to the Offer, and not withdraw, all of
     the Subject Shares.

          4.   Further Assurances.  The Stockholder will, from time to time,
execute and deliver, or cause to be executed and delivered, such additional or
further transfers, assignments, endorsements, consents and other instruments as
Parent or Sub may reasonably request for the purpose of effectively carrying out
the transactions contemplated by this Agreement.

          5.   Assignment.  Neither this Agreement nor any of the rights,
interests or obligations hereunder shall be assigned by any of the parties
without the prior written consent of the other parties, except that Sub may
assign, in its sole discretion, any or all of its rights, interests and
obligations hereunder to Parent or to any direct or indirect wholly owned
subsidiary of Parent.  Subject to the preceding sentence, this Agreement will be
binding upon, inure to the benefit of and be enforceable by the parties and
their respective successors and assigns and, in the case of the Stockholder, the
heirs, executors and administrators of the Stockholder.

          6.   Termination.  Except as provided otherwise herein, this Agreement
shall terminate upon the earlier of (i) the Effective Time (as defined in the
Merger Agreement) and (ii) the termination of the Merger Agreement in accordance
with its terms.


                                      -3-
<PAGE>

          7.   General Provisions.
               ------------------

          (a)  Expenses.  Each party hereto shall pay its own expenses incurred
     in connection with this Agreement, except as specified in the Merger
     Agreement.

          (b)  Specific Performance.  The parties hereto agree that irreparable
     damage would occur in the event that any of the provisions of this
     Agreement were not performed in accordance with their specific terms or
     were otherwise breached.  It is accordingly agreed that the parties shall
     be entitled to an injunction or injunctions to prevent breaches of this
     Agreement and to enforce specifically the terms and provisions hereof in
     any court of the United States or any state thereof having jurisdiction,
     this being in addition to any other remedy to which they are entitled at
     law or in equity.  Each party hereby irrevocably submits to the exclusive
     jurisdiction of the United States District Court for the District of
     Delaware in any action, suit or proceeding arising in connection with this
     Agreement, and agrees that any such action, suit or proceeding shall be
     brought only in such courts (and waives any objection based on forum non
     conveniens or any other objection to venue therein).  Each party hereto
     waives any right to a trial by jury in connection with any such action,
     suit or proceeding.

          (c)  Notice.  All notices, requests, demands and other communications
     hereunder shall be deemed to have been duly given and made if in writing
     and if served by personal delivery upon the party for whom it is intended
     or if sent by telex or telecopier (and also confirmed in writing) to the
     person at the address set forth below, or such other address as may be
     designated in writing hereafter, in the same manner, by such person:

          (i)  if to Parent or Sub, to::

               Smith & Nephew, Inc.
               c/o Smith & Nephew plc
               2 Temple Place
               Victoria Embankment
               London WC2R 3BP
               Attention: Peter Huntley
               Facsimile No.: 171-240-1343

               with a copy to:

               Smith & Nephew, Inc.
               1450 Brooks Road
               Memphis, Tennessee 38116
               Attention: General Counsel
               Facsimile No.: 901-396-7824


                                      -4-
<PAGE>

               and:

               Sidley & Austin
               One First National Plaza
               Chicago, Illinois  60603
               Attention: Dennis V. Osimitz
               Facsimile No.:  312- 853-7036

          (ii) if to the Stockholder, to:





               with a copy to:





          (d)  Parties in Interest.  This Agreement shall inure to the benefit
     of and be binding upon the parties named herein and their respective
     successors and assigns. Nothing in this Agreement, expressed or implied, is
     intended to confer upon any Person other than Parent, Sub or the
     Stockholder, or their permitted successors or assigns, any rights or
     remedies under or by reason of this Agreement.

          (e)  Entire Agreement; Amendments.  This Agreement contains the entire
     agreement between the parties hereto with respect to the subject matter
     hereof and supersedes all prior and contemporaneous agreements and
     understandings, oral or written, with respect to such transactions.  This
     Agreement may not be changed, amended or modified orally, but only by an
     agreement in writing signed by the party against whom any waiver, change,
     amendment, modification or discharge may be sought.

          (f)  Headings.  The section headings herein are for convenience only
     and shall not affect the construction of this Agreement.

          (g)  Counterparts.  This Agreement may be executed in one or more
     counterparts, each of which, when executed, shall be deemed to be an
     original and all of which together shall constitute one and the same
     document.


                                      -5-
<PAGE>

          (h)  Governing Law.  This Agreement shall be governed by, and
     construed in accordance with, the laws of the State of Delaware, regardless
     of the laws that might otherwise govern under applicable principles of
     conflicts of laws thereof.

          (i)  Capitalized Terms.  Capitalized terms not otherwise defined in
     this Agreement shall have the meanings set forth in the Merger Agreement.

          (j)  Severability.  If any term or other provision of this Agreement
     is invalid, illegal or incapable of being enforced by any rule of law, or
     public policy, all other conditions and provisions of this Agreement shall
     nevertheless remain in full force and effect so long as the economic and
     legal substance of the transactions contemplated hereby are not affected in
     any manner materially adverse to any party. Upon such determination that
     any term or other provision is invalid, illegal or incapable of being
     enforced, the parties shall negotiate in good faith to modify this
     Agreement so as to effect the original intent of the parties as closely as
     possible in a mutually acceptable manner in order that the transactions
     contemplated by this Agreement may be consummated as originally
     contemplated to the fullest extent possible.

          8.   No Limitations on Actions of the Shareholder as a Director.
Notwithstanding anything to the contrary in this Agreement, nothing in this
Agreement is intended or shall be construed to require the Shareholder to take
or in any way limit any action that the Shareholder may take to discharge the
Shareholder's fiduciary duties as a director of the Company.


                                      -6-
<PAGE>

          IN WITNESS WHEREOF, each of Parent, Sub and the Stockholder has caused
this Agreement to be signed by its officer thereunto duly authorized and the
Stockholder has signed this Agreement, all as of the date first written above.


                         SMITH & NEPHEW, INC.



                         By: ___________________________________
                              Name:
                              Title:



                         SMITH & NEPHEW ACQUISITION, INC.



                         By: ___________________________________
                              Name:
                              Title:


                         STOCKHOLDER



                         _______________________________________

                         Number of shares of Common Stock owned by the
                         Stockholder on the date hereof:

                         ____________

                         Options to purchase Common Stock held by the
                         Stockholder on the date hereof:

                         ____________


                                      -7-
<PAGE>

                                                                       EXHIBIT B
                                                                       ---------
                            CONDITIONS OF THE OFFER
                            -----------------------

          Notwithstanding any other term of the Offer or this Agreement, Sub
shall not be required to accept for payment or, subject to any applicable rules
and regulations of the SEC, including Rule 14e-1(c) under the Exchange Act
(relating to Sub's obligation to pay for or return tendered Shares after the
termination or withdrawal of the Offer), to pay for any Shares tendered pursuant
to the Offer unless (i) there shall have been validly tendered and not withdrawn
prior to the expiration of the Offer such number of Shares that, together with
the Shares then owned by Holdings and Parent and its Subsidiaries, would
constitute at least a majority of the Shares that in the aggregate are
outstanding determined on a fully diluted basis (assuming the exercise of all
options to purchase Company Common Stock (other than the Parent Option), and the
conversion or exchange of all securities convertible or exchangeable into,
Shares outstanding at the expiration date of the Offer) ("Minimum Condition")
and (ii) any waiting period under the HSR Act and any other waiting periods
under any foreign laws applicable to the purchase of Shares pursuant to the
Offer shall have expired or been terminated prior to the expiration date of the
Offer (the "HSR Condition").  Furthermore, notwithstanding any other term of the
Offer or this Agreement, Sub shall not be required to accept for payment or,
subject as aforesaid, to pay for any Shares not theretofore accepted for payment
or paid for, and may terminate the Offer if, at any time on or after the date of
this Agreement and before the acceptance of such Shares for payment or the
payment therefor, any of the following conditions exists (other than as a result
of any action or inaction of Parent or any of its subsidiaries that constitutes
a breach of this Agreement):

          (a) there shall be threatened or pending by any Governmental Entity
     any suit, action or proceeding (i) challenging the acquisition by Parent or
     Sub of any Shares under the Offer, seeking to restrain or prohibit the
     making or consummation of the Offer or the Merger or the performance of any
     of the other transactions contemplated by this Agreement or the Stockholder
     Agreements (including the voting provisions thereunder), or seeking to
     obtain from the Company, Parent or Sub any damages that are material in
     relation to the Company and its subsidiaries taken as a whole, (ii) seeking
     to prohibit or materially limit the ownership or operation by the Company,
     Parent or any of their respective subsidiaries of a material portion of the
     business or assets of the Company and its subsidiaries, taken as a whole,
     or Parent and its subsidiaries, taken as a whole, or to compel the Company
     or Parent to dispose of or hold separate any material portion of the
     business or assets of the Company and its subsidiaries, taken as a whole,
     or Parent and its subsidiaries, taken as a whole, as a result of the Offer
     or any of the other transactions contemplated by this Agreement or the
     Stockholder Agreements, (iii) seeking to impose material limitations on the
     ability of Parent or Sub to acquire or hold, or exercise full rights of
     ownership of, any Shares to be accepted for payment pursuant to the Offer,
     including the right to vote such Shares on all matters properly presented
     to the stockholders of the Company, (iv) seeking to prohibit Parent or any
     of its subsidiaries
<PAGE>

     from effectively controlling in any material respect any material portion
     of the business or operations of the Company or its subsidiaries or (v)
     which otherwise is reasonably likely to have a Material Adverse Effect on
     the Company, or there shall be pending by any other person any suit, action
     or proceeding which would have a Material Adverse Effect on the Company.

          (b) there shall be enacted, entered, enforced, promulgated or deemed
     applicable to the Offer or the Merger by any Governmental Entity any
     statute, rule, regulation, judgment, order or injunction, other than the
     application to the Offer or the Merger of applicable waiting periods under
     the HSR Act or any other applicable waiting periods under any foreign laws
     enacted as of the date hereof, that is reasonably likely to result,
     directly or indirectly, in any of the consequences referred to in clauses
     (i) through (v) of paragraph (a) above;

          (c) there shall have occurred any Material Adverse Change with
     respect to the Company other than a Material Adverse Change primarily
     caused by the loss of employees of the Company as a result of the Offer or
     the announcement thereof;

          (d) (i) the Board of Directors of the Company or any committee
     thereof shall have withdrawn or modified in a manner adverse to Parent or
     Sub its approval or recommendation of the Offer, the Merger or this
     Agreement, or approved or recommended any Takeover Proposal or (ii) the
     Board of Directors of the Company or any committee thereof shall have
     resolved to take any of the foregoing actions;

          (e) the representations and warranties of the Company set forth in
     this Agreement shall not be true and correct in each case at the date of
     this Agreement and at the scheduled or extended expiration of the Offer
     unless the inaccuracies (without giving effect to any materiality or
     Material Adverse Effect qualifications or exceptions contained therein)
     under such representations and warranties, taking all the inaccuracies
     under all such representations and warranties together in their entirety,
     do not, individually or in the aggregate, result in a Material Adverse
     Effect on the Company;

          (f) the Company shall have failed to perform any obligation or to
     comply with any agreement or covenant of the Company to be performed or
     complied with by it under this Agreement other than any failures which
     would not have, either individually or in the aggregate, a Material Adverse
     Effect on the Company;

          (g) any person or "group" (as defined in Section 13(d)(3) of the
     Exchange Act), other than Parent, Sub or their affiliates or any group of
     which any of them is a member, shall have acquired or announced its
     intention to acquire beneficial ownership (as determined pursuant to Rule
     13d-3 promulgated under the Exchange Act) of 15% or more of the Shares;

                                      -2-
<PAGE>

          (h) there shall have occurred and be continuing (i) any general
     suspension of trading in, or limitation on prices for, securities on a
     national securities exchange in the United States (excluding any
     coordinated trading halt triggered solely as a result of a specified
     decrease in a market index), (ii) a declaration of a banking moratorium or
     any suspension of payments in respect of banks in the United States, (iii)
     any limitation (whether or not mandatory) by any Governmental Entity on, or
     other event that materially adversely affects, the extension of credit by
     banks or other lending institutions, (iv) a commencement of a war or armed
     hostilities or other national or international calamity directly or
     indirectly involving the United States which in any case is reasonably
     expected to have a Material Adverse Effect on the Company or to materially
     adversely affect Parent's or Sub's ability to complete the Offer and/or the
     Merger or materially delay the consummation of the Offer and/or the Merger,
     or (v) from the date of this Agreement through the date of termination or
     expiration, a decline of at least 25% in either the Dow Jones Industrial
     Average or the Standard & Poor's 500 Index; or

          (i) this Agreement shall have been terminated in accordance with its
     terms.

          The foregoing conditions are for the sole benefit of Parent and Sub
and may, subject to the terms of this Agreement, be waived by Parent and Sub in
whole or in part at any time and from time to time in their sole discretion.
The failure by Parent or Sub at any time to exercise any of the foregoing rights
shall not be deemed a waiver of any such right, the waiver of any such right
with respect to particular facts and circumstances shall not be deemed a waiver
with respect to any other facts and circumstances and each such right shall be
deemed an ongoing right that may be asserted at any time and from time to time.
Terms used but not defined herein shall have the meanings assigned to such terms
in the Agreement to which this Exhibit B is a part.

                                      -3-
<PAGE>

                                                                       Exhibit C
                                                                       ---------


                     SECOND AMENDMENT TO RIGHTS AGREEMENT
                     ------------------------------------


          Second Amendment dated as of July __, 1999 (this "Amendment") to
Rights Agreement dated as of December 6, 1996, as amended (the "Rights
Agreement"), between Exogen, Inc., a Delaware corporation (the "Company"), and
Registrar and Transfer Company (the "Rights Agent").

                             W I T N E S S E T H :
                             -------------------

          WHEREAS, the Board of Directors of the Company has approved and
adopted an Agreement and Plan of Merger(the "Merger Agreement") among the
Company, Smith & Nephew, Inc., a Delaware corporation ("Parent") and Smith &
Nephew Acquisition, Inc., a Delaware corporation and a wholly-owned subsidiary
of Parent ("Sub"), providing for the making of a cash tender offer (as such
offer may be amended from time to time, the "Offer") and the merger (the
"Merger") of Sub with and into the Company;

          WHEREAS, the Board of Directors of the Company has determined that the
Offer and the Merger are in furtherance of and consistent with the long-term
business strategy of the Company and are in the best interests of the Company
and its shareholders;

          WHEREAS, the willingness of Parent and Sub to enter into the Merger
Agreement is conditioned on, among other things, the amendment of the Rights
Agreement on the terms set forth herein;

          WHEREAS, at the date of this Amendment, the Distribution Date has not
occurred and there is no Acquiring Person;

          WHEREAS, Section 27 of the Rights Agreement provides that the Company
may from time to time supplement or amend the Rights Agreement in any respect
without the approval of any holders of Rights Certificates, any such supplement
or amendment to be evidenced in a writing signed by the Company and the Rights
Agent; provided, however, that from and after the Distribution Date, the Rights
Agreement may not be amended in any manner which would adversely affect the
interests of the holders of Rights; and

          WHEREAS, in compliance with Section 27 of the Rights Agreement, the
Company and the Rights Agent desire to amend the Rights Agreement as hereinafter
set forth and have executed and delivered this Amendment immediately prior to
the execution and delivery of the Merger Agreement.

<PAGE>

          NOW, THEREFORE, in consideration of the Rights Agreement and the
premises and mutual agreements herein set forth, the parties hereby agree as
follows:

          1.   Section 1 of the Rights Agreement is hereby amended by adding the
following definitions thereto:

          "Merger" shall mean the merger of Sub with and into the Company as
     contemplated by the Merger Agreement.

          "Merger Agreement" shall mean the Agreement and Plan of Merger among
     Parent, Sub and the Company, as the same may be amended in accordance with
     the terms thereof.

          "Parent" shall mean Smith & Nephew, Inc., a Delaware corporation.

          "Stockholder Agreements" shall mean the Stockholder Agreements between
     Parent and each of ___________________, as the same may be amended in
     accordance with the terms thereof.

          "Sub" shall mean Smith & Nephew Acquisition, Inc. a Delaware
     corporation and a wholly-owned subsidiary of Parent.

          2.   The definition of Acquiring Person contained in Section 1(a) of
the Rights Agreement is hereby amended by replacing the "." that appears at the
end of clause (iv) of such Section with "; or " and by adding the following
clause thereafter:

     "(v) prior to the termination of the Merger Agreement in accordance with
     Section 8.1 thereof, Parent, Sub or any of their Affiliates or Associates."

          3.   Section 1(l) of the Rights Agreement is hereby amended by adding
the following to the end of the second parenthetical phrase in clause (ii) of
such Section:

     "and, prior to the termination of the Merger Agreement in accordance with
     Section 8.1 thereof, other than Parent, Sub or any other Subsidiary of
     Parent"

          4.   Section 1(q) of the Rights Agreement is hereby amended by
replacing the word "or" that appears immediately prior to the symbol "(iv)" with
a comma and by adding the following to the end of the amended Section 1(q):

          ", or (iv) the time immediately prior to the Effective Time (as
     defined in the Merger Agreement)."

          5.   The term "Agreement" as used in the Rights Agreement shall be
deemed to refer to the Rights Agreement as amended by this Amendment.


                                      -2-
<PAGE>

          6.   This Amendment shall be deemed to be a contract made under the
laws of the State of Delaware and for all purposes shall be governed by and
construed in accordance with the laws of such State.

          7.   This Amendment may be executed in two or more counterparts, and
each of such counterparts shall for all purposes be deemed to be an original,
and all such counterparts shall together constitute one and the same instrument.

          8.   Any capitalized term used herein without definition shall have
the meaning specified in the Rights Agreement.

          9.   Except as otherwise expressly set forth herein, this Amendment
shall not by implication or otherwise alter, modify, amend or in any other
manner affect any of the terms, conditions, obligations, covenants or agreements
contained in the Rights Agreement, all of which are hereby ratified and
confirmed in all respects and shall continue in full force and effect.


                                      -3-
<PAGE>

          IN WITNESS WHEREOF, the parties hereto have caused this Amendment to
be duly executed and attested, all as of the day and year first above written.

                              EXOGEN, INC.

                              By: ____________________________
                                   Name:
                                   Title:

Attest:



By: ________________________
     Name:
     Title:


                              REGISTRAR AND TRANSFER COMPANY


                              By: __________________________________
                                   Name:
                                   Title:

Attest:



By: ________________________
     Name:
     Title:


                                      -4-

<PAGE>


                                                                    Exhibit 2(a)


                             STOCKHOLDER AGREEMENT
                             ---------------------


          STOCKHOLDER AGREEMENT (this "Agreement"), dated as of July 25, 1999,
among Smith & Nephew, Inc., a Delaware corporation ("Parent"), Smith & Nephew
Acquisition, Inc., a Delaware corporation and a wholly owned subsidiary of
Parent ("Sub"), and the undersigned stockholder (the "Stockholder") of Exogen,
Inc., a Delaware corporation (the "Company").

          WHEREAS, Parent, Sub and the Company, propose to enter into an
Agreement and Plan of Merger dated as of even date herewith (as the same may be
amended or supplemented, the "Merger Agreement") to provide for the making of a
cash tender offer (as such offer may be amended from time to time, the "Offer")
by Sub for any and all shares of Common Stock, par value $.0001 per share, of
the Company (the "Common Stock") at the Offer Price (as defined in the Merger
Agreement) and the merger of the Company and Sub (the "Merger");

          WHEREAS, the Stockholder legally and/or beneficially owns that number
of shares of Common Stock appearing on the signature page hereof (such shares,
as they may be adjusted by any stock dividend, stock split, recapitalization,
combination or exchange of shares, merger, consolidation, reorganization or
other change or transaction of or by the Company (each, an "Adjustment Event")
being referred to herein as the "Subject Shares"); and

          WHEREAS, as a condition to their willingness to enter into the Merger
Agreement, Parent and Sub have requested that the Stockholder enter into this
Agreement;

          NOW, THEREFORE, to induce Parent and Sub to enter into, and in
consideration of their entering into, the Merger Agreement, and in consideration
of the premises and the representations, warranties and agreements contained
herein, the parties agree as follows:

          1.  Representations and Warranties of the Stockholder.  The
Stockholder hereby represents and warrants to Parent and Sub as follows:

          (a)  Authority.  The Stockholder has all requisite power and authority
     to enter into this Agreement and to consummate the transactions
     contemplated hereby.  This Agreement has been duly authorized, executed and
     delivered by the Stockholder and constitutes a valid and binding obligation
     of the Stockholder enforceable in accordance with its terms.  The execution
     and delivery of this Agreement does not, and the consummation of the
     transactions contemplated hereby and compliance with the terms hereof will
     not, conflict with, or result in any violation of, or default (with or
     without

<PAGE>

     notice or lapse of time or both) under any provision of, any trust
     agreement, loan or credit agreement, note, bond, mortgage, indenture, lease
     or other agreement, instrument, permit, concession, franchise, license,
     judgment, order, notice, decree, statute, law, ordinance, rule or
     regulation applicable to the Stockholder or to the Stockholder's property
     or assets. Except for the expiration or termination of the waiting period
     under the HSR Act and informational filings with the SEC, no consent,
     approval, order or authorization of, or registration, declaration or filing
     with, any court, administrative agency or commission or other governmental
     authority or instrumentality, domestic, foreign or supranational, is
     required by or with respect to the Stockholder in connection with the
     execution and delivery of this Agreement or the consummation by the
     Stockholder of the transactions contemplated hereby.

          (b)  The Shares.  The Stockholder has good and marketable title to the
     Subject Shares, free and clear of any claims, liens, encumbrances and
     security interests whatsoever.  The Stockholder owns no shares of Common
     Stock other than the Subject Shares.

          2.  Representations and Warranties of Parent and Sub.

          (a)  Authority.  Parent and Sub hereby represent and warrant to the
     Stockholder that each of Parent and Sub has all requisite corporate power
     and authority to enter into this Agreement and to consummate the
     transactions contemplated hereby. The execution and delivery of this
     Agreement by Parent and Sub, and the consummation of the transactions
     contemplated hereby, have been duly authorized by all necessary corporate
     action on the part of Parent and Sub.  This Agreement has been duly
     executed and delivered by Parent and Sub and constitutes a valid and
     binding obligation of Parent and Sub enforceable in accordance with its
     terms.

          3.  Covenants of the Stockholder.  The Stockholder agrees as follows:

          (a)  At any meeting of stockholders of the Company called to vote upon
     the Merger and the Merger Agreement or at any adjournment thereof or in any
     other circumstances upon which a vote, consent or other approval with
     respect to the Merger and the Merger Agreement is sought, the Stockholder
     shall vote (or cause to be voted) the Subject Shares in favor of the
     Merger, the approval of the Merger Agreement and the approval of the terms
     thereof and each of the other transactions contemplated by the Merger
     Agreement, provided that the terms of the Merger Agreement shall not have
     been amended to adversely affect the Stockholder.

          (b)  At any meeting of stockholders of the Company or at any
     adjournment thereof or in any other circumstances upon which the
     Stockholder's vote, consent or other approval is sought, the Stockholder
     shall vote (or cause to be voted) the Subject Shares against (i) any merger
     agreement or merger (other than the Merger Agreement and the

                                      -2-
<PAGE>

     Merger), consolidation, combination, sale of substantial assets,
     reorganization, recapitalization, dissolution, liquidation or winding up of
     or by the Company or any other Takeover Proposal or (ii) any amendment of
     the Company's articles of incorporation or by-laws or other proposal or
     transaction involving the Company or any of its subsidiaries, which
     amendment or other proposal or transaction would in any manner impede,
     frustrate, prevent or nullify the Merger, the Merger Agreement or any of
     the other transactions contemplated by the Merger Agreement.

          (c)  The Stockholder agrees not to (i) sell, transfer, pledge, assign
     or otherwise dispose of, or enter into any contract, option or other
     arrangement (including any profit sharing arrangement) with respect to the
     sale, transfer, pledge, assignment or other disposition of, the Subject
     Shares to any person other than Sub or Sub's designee or (ii) enter into
     any voting arrangement, whether by proxy, voting agreement or otherwise, in
     connection, directly or indirectly, with any Takeover Proposal.

          (d)  The Stockholder shall not, nor shall the Stockholder permit any
     investment banker, attorney or other adviser or representative of the
     Stockholder to, (i) directly or indirectly solicit, initiate or encourage
     the submission of, any Takeover Proposal or (ii) directly or indirectly
     participate in any discussions or negotiations regarding, or furnish to any
     person any information with respect to, or take any other action to
     facilitate any inquiries or the making of any proposal that constitutes, or
     may reasonably be expected to lead to, any Takeover Proposal.

          (e)  So long as the Merger Agreement has not been terminated, the
     Stockholder shall tender pursuant to the Offer, and not withdraw, all of
     the Subject Shares.

          4.  Further Assurances.  The Stockholder will, from time to time,
execute and deliver, or cause to be executed and delivered, such additional or
further transfers, assignments, endorsements, consents and other instruments as
Parent or Sub may reasonably request for the purpose of effectively carrying out
the transactions contemplated by this Agreement.

          5.  Assignment.  Neither this Agreement nor any of the rights,
interests or obligations hereunder shall be assigned by any of the parties
without the prior written consent of the other parties, except that Sub may
assign, in its sole discretion, any or all of its rights, interests and
obligations hereunder to Parent or to any direct or indirect wholly owned
subsidiary of Parent.  Subject to the preceding sentence, this Agreement will be
binding upon, inure to the benefit of and be enforceable by the parties and
their respective successors and assigns and, in the case of the Stockholder, the
heirs, executors and administrators of the Stockholder.

          6.  Termination.  Except as provided otherwise herein, this Agreement
shall terminate upon the earlier of (i) the Effective Time (as defined in the
Merger Agreement) and (ii) the termination of the Merger Agreement in accordance
with its terms.

                                      -3-
<PAGE>

          7.  General Provisions.

          (a)  Expenses.  Each party hereto shall pay its own expenses incurred
     in connection with this Agreement, except as specified in the Merger
     Agreement.

          (b)  Specific Performance.  The parties hereto agree that irreparable
     damage would occur in the event that any of the provisions of this
     Agreement were not performed in accordance with their specific terms or
     were otherwise breached.  It is accordingly agreed that the parties shall
     be entitled to an injunction or injunctions to prevent breaches of this
     Agreement and to enforce specifically the terms and provisions hereof in
     any court of the United States or any state thereof having jurisdiction,
     this being in addition to any other remedy to which they are entitled at
     law or in equity.  Each party hereby irrevocably submits to the exclusive
     jurisdiction of the United States District Court for the District of
     Delaware in any action, suit or proceeding arising in connection with this
     Agreement, and agrees that any such action, suit or proceeding shall be
     brought only in such courts (and waives any objection based on forum non
     conveniens or any other objection to venue therein).  Each party hereto
     waives any right to a trial by jury in connection with any such action,
     suit or proceeding.

          (c)  Notice.  All notices, requests, demands and other communications
     hereunder shall be deemed to have been duly given and made if in writing
     and if served by personal delivery upon the party for whom it is intended
     or if sent by telex or telecopier (and also confirmed in writing) to the
     person at the address set forth below, or such other address as may be
     designated in writing hereafter, in the same manner, by such person:

          (i)  if to Parent or Sub, to:

               Smith & Nephew, Inc.
               c/o Smith & Nephew plc
               2 Temple Place
               Victoria Embankment
               London WC2R 3BP
               Attention: Peter Huntley
               Facsimile No.: 171-240-1343

               with a copy to:

               Smith & Nephew, Inc.
               1450 Brooks Road
               Memphis, Tennessee 38116
               Attention: General Counsel
               Facsimile No.: 901-396-7824

                                      -4-
<PAGE>

               and to:

               Sidley & Austin
               One First National Plaza
               Chicago, Illinois 60603
               Attention: Dennis V. Osimitz
               Facsimile No.: 312-853-7036

          (ii) if to the Stockholder, to:

               John P. Ryaby
               Exogen, Inc.
               10 Constitution Avenue
               P.O. Box 6860
               Piscataway, New Jersey 08855

               with a copy to:

               Brobeck, Phleger & Harrison LLP
               1633 Broadway
               NewYork, New York
               Attention: Ellen B. Corenswet
               Facsimile No.: 212-586-7878

          (d)  Parties in Interest.  This Agreement shall inure to the benefit
     of and be binding upon the parties named herein and their respective
     successors and assigns. Nothing in this Agreement, expressed or implied, is
     intended to confer upon any Person other than Parent, Sub or the
     Stockholder, or their permitted successors or assigns, any rights or
     remedies under or by reason of this Agreement.

          (e)  Entire Agreement; Amendments.  This Agreement contains the entire
     agreement between the parties hereto with respect to the subject matter
     hereof and supersedes all prior and contemporaneous agreements and
     understandings, oral or written, with respect to such transactions.  This
     Agreement may not be changed, amended or modified orally, but only by an
     agreement in writing signed by the party against whom any waiver, change,
     amendment, modification or discharge may be sought.

          (f)  Headings.  The section headings herein are for convenience only
     and shall not affect the construction of this Agreement.

          (g)  Counterparts.  This Agreement may be executed in one or more
     counterparts, each of which, when executed, shall be deemed to be an
     original and all of which together shall constitute one and the same
     document.

                                      -5-
<PAGE>

          (h)  Governing Law.  This Agreement shall be governed by, and
     construed in accordance with, the laws of the State of Delaware, regardless
     of the laws that might otherwise govern under applicable principles of
     conflicts of laws thereof.

          (i)  Capitalized Terms.  Capitalized terms not otherwise defined in
     this Agreement shall have the meanings set forth in the Merger Agreement.

          (j)  Severability.  If any term or other provision of this Agreement
     is invalid, illegal or incapable of being enforced by any rule of law, or
     public policy, all other conditions and provisions of this Agreement shall
     nevertheless remain in full force and effect so long as the economic and
     legal substance of the transactions contemplated hereby are not affected in
     any manner materially adverse to any party.  Upon such determination that
     any term or other provision is invalid, illegal or incapable of being
     enforced, the parties shall negotiate in good faith to modify this
     Agreement so as to effect the original intent of the parties as closely as
     possible in a mutually acceptable manner in order that the transactions
     contemplated by this Agreement may be consummated as originally
     contemplated to the fullest extent possible.

          8.   No Limitations on Actions of the Shareholder as a Director.
Notwithstanding anything to the contrary in this Agreement, nothing in this
Agreement is intended or shall be construed to require the Shareholder to take
or in any way limit any action that the Shareholder may take to discharge the
Shareholder's fiduciary duties as a director of the Company.

                                      -6-
<PAGE>

          IN WITNESS WHEREOF, each of Parent, Sub and the Stockholder has caused
this Agreement to be signed by its officer thereunto duly authorized and the
Stockholder has signed this Agreement, all as of the date first written above.


                         SMITH & NEPHEW, INC.



                         By: /s/ Cliff Lomax
                             ----------------------------
                                 Name: Cliff Lomax
                                 Title: Treasurer



                         SMITH & NEPHEW ACQUISITION, INC.



                         By: /s/ Cliff Lomax
                             ----------------------------
                                 Name: Cliff Lomax
                                 Title: Chairman


                         STOCKHOLDER



                         /s/ John P. Ryaby
                         --------------------------------

                         Number of shares of Common Stock owned by the
                         Stockholder on the date hereof:

                            137,850
                         -------------

                         Options to purchase Common Stock held by the
                         Stockholder on the date hereof:

                             40,000
                         -------------

                                      -7-
<PAGE>

                                                                    Exhibit 2(b)


                             STOCKHOLDER AGREEMENT
                             ---------------------


          STOCKHOLDER AGREEMENT (this "Agreement"), dated as of July 25, 1999,
among Smith & Nephew, Inc., a Delaware corporation ("Parent"), Smith & Nephew
Acquisition, Inc., a Delaware corporation and a wholly owned subsidiary of
Parent ("Sub"), and the undersigned stockholder (the "Stockholder") of Exogen,
Inc.,  a Delaware corporation (the "Company").

          WHEREAS, Parent, Sub and the Company, propose to enter into an
Agreement and Plan of Merger dated as of even date herewith (as the same may be
amended or supplemented, the "Merger Agreement") to provide for the making of a
cash tender offer (as such offer may be amended from time to time, the "Offer")
by Sub for any and all shares of Common Stock, par value $.0001 per share, of
the Company (the "Common Stock") at the Offer Price (as defined in the Merger
Agreement) and the merger of the Company and Sub (the "Merger");

          WHEREAS, the Stockholder legally and/or beneficially owns that number
of shares of Common Stock appearing on the signature page hereof (such shares,
as they may be adjusted by any stock dividend, stock split, recapitalization,
combination or exchange of shares, merger, consolidation, reorganization or
other change or transaction of or by the Company (each, an "Adjustment Event")
being referred to herein as the "Subject Shares");  and

          WHEREAS, as a condition to their willingness to enter into the Merger
Agreement, Parent and Sub have requested that the Stockholder enter into this
Agreement;

          NOW, THEREFORE, to induce Parent and Sub to enter into, and in
consideration of their entering into, the Merger Agreement, and in consideration
of the premises and the representations, warranties and agreements contained
herein, the parties agree as follows:

          1.  Representations and Warranties of the Stockholder.  The
Stockholder hereby represents and warrants to Parent and Sub as follows:

          (a)  Authority.  The Stockholder has all requisite power and authority
     to enter into this Agreement and to consummate the transactions
     contemplated hereby.  This Agreement has been duly authorized, executed and
     delivered by the Stockholder and constitutes a valid and binding obligation
     of the Stockholder enforceable in accordance with its terms.  The execution
     and delivery of this Agreement does not, and the consummation of the
     transactions contemplated hereby and compliance with the terms hereof will
     not, conflict with, or result in any violation of, or default (with or
     without

<PAGE>

     notice or lapse of time or both) under any provision of, any trust
     agreement, loan or credit agreement, note, bond, mortgage, indenture, lease
     or other agreement, instrument, permit, concession, franchise, license,
     judgment, order, notice, decree, statute, law, ordinance, rule or
     regulation applicable to the Stockholder or to the Stockholder's property
     or assets. Except for the expiration or termination of the waiting period
     under the HSR Act and informational filings with the SEC, no consent,
     approval, order or authorization of, or registration, declaration or filing
     with, any court, administrative agency or commission or other governmental
     authority or instrumentality, domestic, foreign or supranational, is
     required by or with respect to the Stockholder in connection with the
     execution and delivery of this Agreement or the consummation by the
     Stockholder of the transactions contemplated hereby.

          (b)  The Shares.  The Stockholder has good and marketable title to the
     Subject Shares, free and clear of any claims, liens, encumbrances and
     security interests whatsoever.  The Stockholder owns no shares of Common
     Stock other than the Subject Shares.

          2.  Representations and Warranties of Parent and Sub.

          (a)  Authority.  Parent and Sub hereby represent and warrant to the
     Stockholder that each of Parent and Sub has all requisite corporate power
     and authority to enter into this Agreement and to consummate the
     transactions contemplated hereby. The execution and delivery of this
     Agreement by Parent and Sub, and the consummation of the transactions
     contemplated hereby, have been duly authorized by all necessary corporate
     action on the part of Parent and Sub.  This Agreement has been duly
     executed and delivered by Parent and Sub and constitutes a valid and
     binding obligation of Parent and Sub enforceable in accordance with its
     terms.

          3.  Covenants of the Stockholder.  The Stockholder agrees as follows:

          (a)  At any meeting of stockholders of the Company called to vote upon
     the Merger and the Merger Agreement or at any adjournment thereof or in any
     other circumstances upon which a vote, consent or other approval with
     respect to the Merger and the Merger Agreement is sought, the Stockholder
     shall vote (or cause to be voted) the Subject Shares in favor of the
     Merger, the approval of the Merger Agreement and the approval of the terms
     thereof and each of the other transactions contemplated by the Merger
     Agreement, provided that the terms of the Merger Agreement shall not have
     been amended to adversely affect the Stockholder.

          (b)  At any meeting of stockholders of the Company or at any
     adjournment thereof or in any other circumstances upon which the
     Stockholder's vote, consent or other approval is sought, the Stockholder
     shall vote (or cause to be voted) the Subject Shares against (i) any merger
     agreement or merger (other than the Merger Agreement and the

                                      -2-
<PAGE>

     Merger), consolidation, combination, sale of substantial assets,
     reorganization, recapitalization, dissolution, liquidation or winding up of
     or by the Company or any other Takeover Proposal or (ii) any amendment of
     the Company's articles of incorporation or by-laws or other proposal or
     transaction involving the Company or any of its subsidiaries, which
     amendment or other proposal or transaction would in any manner impede,
     frustrate, prevent or nullify the Merger, the Merger Agreement or any of
     the other transactions contemplated by the Merger Agreement.

          (c)  The Stockholder agrees not to (i) sell, transfer, pledge, assign
     or otherwise dispose of, or enter into any contract, option or other
     arrangement (including any profit sharing arrangement) with respect to the
     sale, transfer, pledge, assignment or other disposition of, the Subject
     Shares to any person other than Sub or Sub's designee or (ii) enter into
     any voting arrangement, whether by proxy, voting agreement or otherwise, in
     connection, directly or indirectly, with any Takeover Proposal.

          (d)  The Stockholder shall not, nor shall the Stockholder permit any
     investment banker, attorney or other adviser or representative of the
     Stockholder to, (i) directly or indirectly solicit, initiate or encourage
     the submission of, any Takeover Proposal or (ii) directly or indirectly
     participate in any discussions or negotiations regarding, or furnish to any
     person any information with respect to, or take any other action to
     facilitate any inquiries or the making of any proposal that constitutes, or
     may reasonably be expected to lead to, any Takeover Proposal.

          (e)  So long as the Merger Agreement has not been terminated, the
     Stockholder shall tender pursuant to the Offer, and not withdraw, all of
     the Subject Shares.

          4.  Further Assurances.  The Stockholder will, from time to time,
execute and deliver, or cause to be executed and delivered, such additional or
further transfers, assignments, endorsements, consents and other instruments as
Parent or Sub may reasonably request for the purpose of effectively carrying out
the transactions contemplated by this Agreement.

          5.  Assignment.  Neither this Agreement nor any of the rights,
interests or obligations hereunder shall be assigned by any of the parties
without the prior written consent of the other parties, except that Sub may
assign, in its sole discretion, any or all of its rights, interests and
obligations hereunder to Parent or to any direct or indirect wholly owned
subsidiary of Parent.  Subject to the preceding sentence, this Agreement will be
binding upon, inure to the benefit of and be enforceable by the parties and
their respective successors and assigns and, in the case of the Stockholder, the
heirs, executors and administrators of the Stockholder.

          6.  Termination.  Except as provided otherwise herein, this Agreement
shall terminate upon the earlier of (i) the Effective Time (as defined in the
Merger Agreement) and (ii) the termination of the Merger Agreement in accordance
with its terms.

                                      -3-
<PAGE>

          7.  General Provisions.

          (a)  Expenses.  Each party hereto shall pay its own expenses incurred
     in connection with this Agreement, except as specified in the Merger
     Agreement.

          (b)  Specific Performance.  The parties hereto agree that irreparable
     damage would occur in the event that any of the provisions of this
     Agreement were not performed in accordance with their specific terms or
     were otherwise breached.  It is accordingly agreed that the parties shall
     be entitled to an injunction or injunctions to prevent breaches of this
     Agreement and to enforce specifically the terms and provisions hereof in
     any court of the United States or any state thereof having jurisdiction,
     this being in addition to any other remedy to which they are entitled at
     law or in equity.  Each party hereby irrevocably submits to the exclusive
     jurisdiction of the United States District Court for the District of
     Delaware in any action, suit or proceeding arising in connection with this
     Agreement, and agrees that any such action, suit or proceeding shall be
     brought only in such courts (and waives any objection based on forum non
     conveniens or any other objection to venue therein).  Each party hereto
     waives any right to a trial by jury in connection with any such action,
     suit or proceeding.

          (c)  Notice.  All notices, requests, demands and other communications
     hereunder shall be deemed to have been duly given and made if in writing
     and if served by personal delivery upon the party for whom it is intended
     or if sent by telex or telecopier (and also confirmed in writing) to the
     person at the address set forth below, or such other address as may be
     designated in writing hereafter, in the same manner, by such person:

          (i)  if to Parent or Sub, to:

               Smith & Nephew, Inc.
               c/o Smith & Nephew plc
               2 Temple Place
               Victoria Embankment
               London WC2R 3BP
               Attention: Peter Huntley
               Facsimile No.: 171-240-1343

               with a copy to:

               Smith & Nephew, Inc.
               1450 Brooks Road
               Memphis, Tennessee 38116
               Attention: General Counsel
               Facsimile No.: 901-396-7824

                                      -4-
<PAGE>

               and to:

               Sidley & Austin
               One First National Plaza
               Chicago, Illinois 60603
               Attention: Dennis V. Osimitz
               Facsimile No.: 312-853-7036

          (ii) if to the Stockholder, to:

               Buzz Benson
               Piper Jaffray Inc.
               222 South Ninth Street
               Minneapolis, MN 55402

               with a copy to:

               Brobeck, Phleger & Harrison LLP
               1633 Broadway
               New York, New York
               Attention: Ellen B. Corenswet
               Facsimile No.: 212-586-7878

          (d)  Parties in Interest.  This Agreement shall inure to the benefit
     of and be binding upon the parties named herein and their respective
     successors and assigns. Nothing in this Agreement, expressed or implied, is
     intended to confer upon any Person other than Parent, Sub or the
     Stockholder, or their permitted successors or assigns, any rights or
     remedies under or by reason of this Agreement.

          (e)  Entire Agreement; Amendments.  This Agreement contains the entire
     agreement between the parties hereto with respect to the subject matter
     hereof and supersedes all prior and contemporaneous agreements and
     understandings, oral or written, with respect to such transactions.  This
     Agreement may not be changed, amended or modified orally, but only by an
     agreement in writing signed by the party against whom any waiver, change,
     amendment, modification or discharge may be sought.

          (f)  Headings.  The section headings herein are for convenience only
     and shall not affect the construction of this Agreement.

          (g)  Counterparts.  This Agreement may be executed in one or more
     counterparts, each of which, when executed, shall be deemed to be an
     original and all of which together shall constitute one and the same
     document.

                                      -5-
<PAGE>

          (h)  Governing Law.  This Agreement shall be governed by, and
     construed in accordance with, the laws of the State of Delaware, regardless
     of the laws that might otherwise govern under applicable principles of
     conflicts of laws thereof.

          (i)  Capitalized Terms.  Capitalized terms not otherwise defined in
     this Agreement shall have the meanings set forth in the Merger Agreement.

          (j)  Severability.  If any term or other provision of this Agreement
     is invalid, illegal or incapable of being enforced by any rule of law, or
     public policy, all other conditions and provisions of this Agreement shall
     nevertheless remain in full force and effect so long as the economic and
     legal substance of the transactions contemplated hereby are not affected in
     any manner materially adverse to any party.  Upon such determination that
     any term or other provision is invalid, illegal or incapable of being
     enforced, the parties shall negotiate in good faith to modify this
     Agreement so as to effect the original intent of the parties as closely as
     possible in a mutually acceptable manner in order that the transactions
     contemplated by this Agreement may be consummated as originally
     contemplated to the fullest extent possible.

          8.   No Limitations on Actions of the Shareholder as a Director.
Notwithstanding anything to the contrary in this Agreement, nothing in this
Agreement is intended or shall be construed to require the Shareholder to take
or in any way limit any action that the Shareholder may take to discharge the
Shareholder's fiduciary duties as a director of the Company.

                                      -6-
<PAGE>

          IN WITNESS WHEREOF, each of Parent, Sub and the Stockholder has caused
this Agreement to be signed by its officer thereunto duly authorized and the
Stockholder has signed this Agreement, all as of the date first written above.


                         SMITH & NEPHEW, INC.



                         By: /s/ Cliff Lomax
                             --------------------------------
                                 Name: Cliff Lomax
                                 Title: Treasurer



                         SMITH & NEPHEW ACQUISITION, INC.



                         By:  /s/ Cliff Lomax
                              -------------------------------
                                  Name: Cliff Lomax
                                  Title: Chairman


                         STOCKHOLDER


                         /s/ Buzz Benson
                         ------------------------------------

                         Number of shares of Common Stock owned by the
                         Stockholder on the date hereof:

                           20,025
                         ----------

                         Options to purchase Common Stock held by the
                         Stockholder on the date hereof:

                            5,000
                         ----------

                                      -7-
<PAGE>

                                                                    Exhibit 2(c)

                             STOCKHOLDER AGREEMENT
                             ---------------------


          STOCKHOLDER AGREEMENT (this "Agreement"), dated as of July 25, 1999,
among Smith & Nephew, Inc., a Delaware corporation ("Parent"), Smith & Nephew
Acquisition, Inc., a Delaware corporation and a wholly owned subsidiary of
Parent ("Sub"), and the undersigned stockholder (the "Stockholder") of Exogen,
Inc., a Delaware corporation (the "Company").

          WHEREAS, Parent, Sub and the Company, propose to enter into an
Agreement and Plan of Merger dated as of even date herewith (as the same may be
amended or supplemented, the "Merger Agreement") to provide for the making of a
cash tender offer (as such offer may be amended from time to time, the "Offer")
by Sub for any and all shares of Common Stock, par value $.0001 per share, of
the Company (the "Common Stock") at the Offer Price (as defined in the Merger
Agreement) and the merger of the Company and Sub (the "Merger");

          WHEREAS, the Stockholder legally and/or beneficially owns that number
of shares of Common Stock appearing on the signature page hereof (such shares,
as they may be adjusted by any stock dividend, stock split, recapitalization,
combination or exchange of shares, merger, consolidation, reorganization or
other change or transaction of or by the Company (each, an "Adjustment Event")
being referred to herein as the "Subject Shares"); and

          WHEREAS, as a condition to their willingness to enter into the Merger
Agreement, Parent and Sub have requested that the Stockholder enter into this
Agreement;

          NOW, THEREFORE, to induce Parent and Sub to enter into, and in
consideration of their entering into, the Merger Agreement, and in consideration
of the premises and the representations, warranties and agreements contained
herein, the parties agree as follows:

          1.  Representations and Warranties of the Stockholder.  The
Stockholder hereby represents and warrants to Parent and Sub as follows:

          (a)  Authority.  The Stockholder has all requisite power and authority
     to enter into this Agreement and to consummate the transactions
     contemplated hereby.  This Agreement has been duly authorized, executed and
     delivered by the Stockholder and constitutes a valid and binding obligation
     of the Stockholder enforceable in accordance with its terms.  The execution
     and delivery of this Agreement does not, and the consummation of the
     transactions contemplated hereby and compliance with the terms hereof will
     not, conflict with, or result in any violation of, or default (with or
     without

<PAGE>

     notice or lapse of time or both) under any provision of, any trust
     agreement, loan or credit agreement, note, bond, mortgage, indenture, lease
     or other agreement, instrument, permit, concession, franchise, license,
     judgment, order, notice, decree, statute, law, ordinance, rule or
     regulation applicable to the Stockholder or to the Stockholder's property
     or assets. Except for the expiration or termination of the waiting period
     under the HSR Act and informational filings with the SEC, no consent,
     approval, order or authorization of, or registration, declaration or filing
     with, any court, administrative agency or commission or other governmental
     authority or instrumentality, domestic, foreign or supranational, is
     required by or with respect to the Stockholder in connection with the
     execution and delivery of this Agreement or the consummation by the
     Stockholder of the transactions contemplated hereby.

          (b)  The Shares.  The Stockholder has good and marketable title to the
     Subject Shares, free and clear of any claims, liens, encumbrances and
     security interests whatsoever.  The Stockholder owns no shares of Common
     Stock other than the Subject Shares.

          2.  Representations and Warranties of Parent and Sub.

          (a)  Authority.  Parent and Sub hereby represent and warrant to the
     Stockholder that each of Parent and Sub has all requisite corporate power
     and authority to enter into this Agreement and to consummate the
     transactions contemplated hereby. The execution and delivery of this
     Agreement by Parent and Sub, and the consummation of the transactions
     contemplated hereby, have been duly authorized by all necessary corporate
     action on the part of Parent and Sub.  This Agreement has been duly
     executed and delivered by Parent and Sub and constitutes a valid and
     binding obligation of Parent and Sub enforceable in accordance with its
     terms.

          3.  Covenants of the Stockholder.  The Stockholder agrees as follows:

          (a)  At any meeting of stockholders of the Company called to vote upon
     the Merger and the Merger Agreement or at any adjournment thereof or in any
     other circumstances upon which a vote, consent or other approval with
     respect to the Merger and the Merger Agreement is sought, the Stockholder
     shall vote (or cause to be voted) the Subject Shares in favor of the
     Merger, the approval of the Merger Agreement and the approval of the terms
     thereof and each of the other transactions contemplated by the Merger
     Agreement, provided that the terms of the Merger Agreement shall not have
     been amended to adversely affect the Stockholder.

          (b)  At any meeting of stockholders of the Company or at any
     adjournment thereof or in any other circumstances upon which the
     Stockholder's vote, consent or other approval is sought, the Stockholder
     shall vote (or cause to be voted) the Subject Shares against (i) any merger
     agreement or merger (other than the Merger Agreement and the

                                      -2-
<PAGE>

     Merger), consolidation, combination, sale of substantial assets,
     reorganization, recapitalization, dissolution, liquidation or winding up of
     or by the Company or any other Takeover Proposal or (ii) any amendment of
     the Company's articles of incorporation or by-laws or other proposal or
     transaction involving the Company or any of its subsidiaries, which
     amendment or other proposal or transaction would in any manner impede,
     frustrate, prevent or nullify the Merger, the Merger Agreement or any of
     the other transactions contemplated by the Merger Agreement.

          (c)  The Stockholder agrees not to (i) sell, transfer, pledge, assign
     or otherwise dispose of, or enter into any contract, option or other
     arrangement (including any profit sharing arrangement) with respect to the
     sale, transfer, pledge, assignment or other disposition of, the Subject
     Shares to any person other than Sub or Sub's designee or (ii) enter into
     any voting arrangement, whether by proxy, voting agreement or otherwise, in
     connection, directly or indirectly, with any Takeover Proposal.

          (d)  The Stockholder shall not, nor shall the Stockholder permit any
     investment banker, attorney or other adviser or representative of the
     Stockholder to, (i) directly or indirectly solicit, initiate or encourage
     the submission of, any Takeover Proposal or (ii) directly or indirectly
     participate in any discussions or negotiations regarding, or furnish to any
     person any information with respect to, or take any other action to
     facilitate any inquiries or the making of any proposal that constitutes, or
     may reasonably be expected to lead to, any Takeover Proposal.

          (e)  So long as the Merger Agreement has not been terminated, the
     Stockholder shall tender pursuant to the Offer, and not withdraw, all of
     the Subject Shares.

          4.  Further Assurances.  The Stockholder will, from time to time,
execute and deliver, or cause to be executed and delivered, such additional or
further transfers, assignments, endorsements, consents and other instruments as
Parent or Sub may reasonably request for the purpose of effectively carrying out
the transactions contemplated by this Agreement.

          5.  Assignment.  Neither this Agreement nor any of the rights,
interests or obligations hereunder shall be assigned by any of the parties
without the prior written consent of the other parties, except that Sub may
assign, in its sole discretion, any or all of its rights, interests and
obligations hereunder to Parent or to any direct or indirect wholly owned
subsidiary of Parent.  Subject to the preceding sentence, this Agreement will be
binding upon, inure to the benefit of and be enforceable by the parties and
their respective successors and assigns and, in the case of the Stockholder, the
heirs, executors and administrators of the Stockholder.

          6.  Termination.  Except as provided otherwise herein, this Agreement
shall terminate upon the earlier of (i) the Effective Time (as defined in the
Merger Agreement) and (ii) the termination of the Merger Agreement in accordance
with its terms.

                                      -3-
<PAGE>

          7.  General Provisions.

          (a)  Expenses.  Each party hereto shall pay its own expenses incurred
     in connection with this Agreement, except as specified in the Merger
     Agreement.

          (b)  Specific Performance.  The parties hereto agree that irreparable
     damage would occur in the event that any of the provisions of this
     Agreement were not performed in accordance with their specific terms or
     were otherwise breached.  It is accordingly agreed that the parties shall
     be entitled to an injunction or injunctions to prevent breaches of this
     Agreement and to enforce specifically the terms and provisions hereof in
     any court of the United States or any state thereof having jurisdiction,
     this being in addition to any other remedy to which they are entitled at
     law or in equity.  Each party hereby irrevocably submits to the exclusive
     jurisdiction of the United States District Court for the District of
     Delaware in any action, suit or proceeding arising in connection with this
     Agreement, and agrees that any such action, suit or proceeding shall be
     brought only in such courts (and waives any objection based on forum non
     conveniens or any other objection to venue therein).  Each party hereto
     waives any right to a trial by jury in connection with any such action,
     suit or proceeding.

          (c)  Notice.  All notices, requests, demands and other communications
     hereunder shall be deemed to have been duly given and made if in writing
     and if served by personal delivery upon the party for whom it is intended
     or if sent by telex or telecopier (and also confirmed in writing) to the
     person at the address set forth below, or such other address as may be
     designated in writing hereafter, in the same manner, by such person:

          (i)  if to Parent or Sub, to:

               Smith & Nephew, Inc.
               c/o Smith & Nephew plc
               2 Temple Place
               Victoria Embankment
               London WC2R 3BP
               Attention: Peter Huntley
               Facsimile No.: 171-240-1343

               with a copy to:

               Smith & Nephew, Inc.
               1450 Brooks Road
               Memphis, Tennessee 38116
               Attention: General Counsel
               Facsimile No.: 901-396-7824

                                      -4-
<PAGE>

               and to:

               Sidley & Austin
               One First National Plaza
               Chicago, Illinois 60603
               Attention: Dennis V. Osimitz
               Facsimile No.: 312-853-7036

          (ii) if to the Stockholder, to:

               Donald J. Lothrop
               Delphi Ventures
               3000 Sand Hill Road
               Bldg. 1, Suuie 135
               Menlo Park, CA 94025

               with a copy to:

               Brobeck, Phleger & Harrison LLP
               1633 Broadway
               NewYork, New York
               Attention: Ellen B. Corenswet
               Facsimile No.: 212-586-7878

          (d)  Parties in Interest.  This Agreement shall inure to the benefit
     of and be binding upon the parties named herein and their respective
     successors and assigns. Nothing in this Agreement, expressed or implied, is
     intended to confer upon any Person other than Parent, Sub or the
     Stockholder, or their permitted successors or assigns, any rights or
     remedies under or by reason of this Agreement.

          (e)  Entire Agreement; Amendments.  This Agreement contains the entire
     agreement between the parties hereto with respect to the subject matter
     hereof and supersedes all prior and contemporaneous agreements and
     understandings, oral or written, with respect to such transactions.  This
     Agreement may not be changed, amended or modified orally, but only by an
     agreement in writing signed by the party against whom any waiver, change,
     amendment, modification or discharge may be sought.

          (f)  Headings.  The section headings herein are for convenience only
     and shall not affect the construction of this Agreement.

          (g)  Counterparts.  This Agreement may be executed in one or more
     counterparts, each of which, when executed, shall be deemed to be an
     original and all of which together shall constitute one and the same
     document.

                                      -5-
<PAGE>

          (h)  Governing Law.  This Agreement shall be governed by, and
     construed in accordance with, the laws of the State of Delaware, regardless
     of the laws that might otherwise govern under applicable principles of
     conflicts of laws thereof.

          (i)  Capitalized Terms.  Capitalized terms not otherwise defined in
     this Agreement shall have the meanings set forth in the Merger Agreement.

          (j)  Severability.  If any term or other provision of this Agreement
     is invalid, illegal or incapable of being enforced by any rule of law, or
     public policy, all other conditions and provisions of this Agreement shall
     nevertheless remain in full force and effect so long as the economic and
     legal substance of the transactions contemplated hereby are not affected in
     any manner materially adverse to any party.  Upon such determination that
     any term or other provision is invalid, illegal or incapable of being
     enforced, the parties shall negotiate in good faith to modify this
     Agreement so as to effect the original intent of the parties as closely as
     possible in a mutually acceptable manner in order that the transactions
     contemplated by this Agreement may be consummated as originally
     contemplated to the fullest extent possible.

          8.   No Limitations on Actions of the Shareholder as a Director.
Notwithstanding anything to the contrary in this Agreement, nothing in this
Agreement is intended or shall be construed to require the Shareholder to take
or in any way limit any action that the Shareholder may take to discharge the
Shareholder's fiduciary duties as a director of the Company.

                                      -6-
<PAGE>

          IN WITNESS WHEREOF, each of Parent, Sub and the Stockholder has caused
this Agreement to be signed by its officer thereunto duly authorized and the
Stockholder has signed this Agreement, all as of the date first written above.


                         SMITH & NEPHEW, INC.



                         By: /s/ Cliff Lomax
                             ------------------------------
                                 Name: Cliff Lomax
                                 Title: Treasurer



                         SMITH & NEPHEW ACQUISITION, INC.



                         By: /s/ Cliff Lomax
                             ------------------------------
                                 Name: Cliff Lomax
                                 Title: Chairman


                         STOCKHOLDER



                         /s/ Donald J. Lothrop
                         ----------------------------------

                         Number of shares of Common Stock owned by the
                         Stockholder on the date hereof:

                            59,112
                         ------------

                         Options to purchase Common Stock held by the
                         Stockholder on the date hereof:

                             5,000
                         ------------

                                      -7-
<PAGE>

                                                                    Exhibit 2(d)


                             STOCKHOLDER AGREEMENT
                             ---------------------


          STOCKHOLDER AGREEMENT (this "Agreement"), dated as of July 25, 1999,
among Smith & Nephew, Inc., a Delaware corporation ("Parent"), Smith & Nephew
Acquisition, Inc., a Delaware corporation and a wholly owned subsidiary of
Parent ("Sub"), and the undersigned stockholder (the "Stockholder") of Exogen,
Inc., a Delaware corporation (the "Company").

          WHEREAS, Parent, Sub and the Company, propose to enter into an
Agreement and Plan of Merger dated as of even date herewith (as the same may be
amended or supplemented, the "Merger Agreement") to provide for the making of a
cash tender offer (as such offer may be amended from time to time, the "Offer")
by Sub for any and all shares of Common Stock, par value $.0001 per share, of
the Company (the "Common Stock") at the Offer Price (as defined in the Merger
Agreement) and the merger of the Company and Sub (the "Merger");

          WHEREAS, the Stockholder legally and/or beneficially owns that number
of shares of Common Stock appearing on the signature page hereof (such shares,
as they may be adjusted by any stock dividend, stock split, recapitalization,
combination or exchange of shares, merger, consolidation, reorganization or
other change or transaction of or by the Company (each, an "Adjustment Event")
being referred to herein as the "Subject Shares"); and

          WHEREAS, as a condition to their willingness to enter into the Merger
Agreement, Parent and Sub have requested that the Stockholder enter into this
Agreement;

          NOW, THEREFORE, to induce Parent and Sub to enter into, and in
consideration of their entering into, the Merger Agreement, and in consideration
of the premises and the representations, warranties and agreements contained
herein, the parties agree as follows:

          1.  Representations and Warranties of the Stockholder.  The
Stockholder hereby represents and warrants to Parent and Sub as follows:

          (a)  Authority.  The Stockholder has all requisite power and authority
     to enter into this Agreement and to consummate the transactions
     contemplated hereby.  This Agreement has been duly authorized, executed and
     delivered by the Stockholder and constitutes a valid and binding obligation
     of the Stockholder enforceable in accordance with its terms.  The execution
     and delivery of this Agreement does not, and the consummation of the
     transactions contemplated hereby and compliance with the terms hereof will
     not, conflict with, or result in any violation of, or default (with or
     without

<PAGE>

     notice or lapse of time or both) under any provision of, any trust
     agreement, loan or credit agreement, note, bond, mortgage, indenture, lease
     or other agreement, instrument, permit, concession, franchise, license,
     judgment, order, notice, decree, statute, law, ordinance, rule or
     regulation applicable to the Stockholder or to the Stockholder's property
     or assets. Except for the expiration or termination of the waiting period
     under the HSR Act and informational filings with the SEC, no consent,
     approval, order or authorization of, or registration, declaration or filing
     with, any court, administrative agency or commission or other governmental
     authority or instrumentality, domestic, foreign or supranational, is
     required by or with respect to the Stockholder in connection with the
     execution and delivery of this Agreement or the consummation by the
     Stockholder of the transactions contemplated hereby.

          (b)  The Shares.  The Stockholder has good and marketable title to the
     Subject Shares, free and clear of any claims, liens, encumbrances and
     security interests whatsoever.  The Stockholder owns no shares of Common
     Stock other than the Subject Shares.

          2.  Representations and Warranties of Parent and Sub.

          (a)  Authority.  Parent and Sub hereby represent and warrant to the
     Stockholder that each of Parent and Sub has all requisite corporate power
     and authority to enter into this Agreement and to consummate the
     transactions contemplated hereby. The execution and delivery of this
     Agreement by Parent and Sub, and the consummation of the transactions
     contemplated hereby, have been duly authorized by all necessary corporate
     action on the part of Parent and Sub.  This Agreement has been duly
     executed and delivered by Parent and Sub and constitutes a valid and
     binding obligation of Parent and Sub enforceable in accordance with its
     terms.

          3.  Covenants of the Stockholder.  The Stockholder agrees as follows:

          (a)  At any meeting of stockholders of the Company called to vote upon
     the Merger and the Merger Agreement or at any adjournment thereof or in any
     other circumstances upon which a vote, consent or other approval with
     respect to the Merger and the Merger Agreement is sought, the Stockholder
     shall vote (or cause to be voted) the Subject Shares in favor of the
     Merger, the approval of the Merger Agreement and the approval of the terms
     thereof and each of the other transactions contemplated by the Merger
     Agreement, provided that the terms of the Merger Agreement shall not have
     been amended to adversely affect the Stockholder.

          (b)  At any meeting of stockholders of the Company or at any
     adjournment thereof or in any other circumstances upon which the
     Stockholder's vote, consent or other approval is sought, the Stockholder
     shall vote (or cause to be voted) the Subject Shares against (i) any merger
     agreement or merger (other than the Merger Agreement and the

                                      -2-
<PAGE>

     Merger), consolidation, combination, sale of substantial assets,
     reorganization, recapitalization, dissolution, liquidation or winding up of
     or by the Company or any other Takeover Proposal or (ii) any amendment of
     the Company's articles of incorporation or by-laws or other proposal or
     transaction involving the Company or any of its subsidiaries, which
     amendment or other proposal or transaction would in any manner impede,
     frustrate, prevent or nullify the Merger, the Merger Agreement or any of
     the other transactions contemplated by the Merger Agreement.

          (c)  The Stockholder agrees not to (i) sell, transfer, pledge, assign
     or otherwise dispose of, or enter into any contract, option or other
     arrangement (including any profit sharing arrangement) with respect to the
     sale, transfer, pledge, assignment or other disposition of, the Subject
     Shares to any person other than Sub or Sub's designee or (ii) enter into
     any voting arrangement, whether by proxy, voting agreement or otherwise, in
     connection, directly or indirectly, with any Takeover Proposal.

          (d)  The Stockholder shall not, nor shall the Stockholder permit any
     investment banker, attorney or other adviser or representative of the
     Stockholder to, (i) directly or indirectly solicit, initiate or encourage
     the submission of, any Takeover Proposal or (ii) directly or indirectly
     participate in any discussions or negotiations regarding, or furnish to any
     person any information with respect to, or take any other action to
     facilitate any inquiries or the making of any proposal that constitutes, or
     may reasonably be expected to lead to, any Takeover Proposal.

          (e)  So long as the Merger Agreement has not been terminated, the
     Stockholder shall tender pursuant to the Offer, and not withdraw, all of
     the Subject Shares.

          4.  Further Assurances.  The Stockholder will, from time to time,
execute and deliver, or cause to be executed and delivered, such additional or
further transfers, assignments, endorsements, consents and other instruments as
Parent or Sub may reasonably request for the purpose of effectively carrying out
the transactions contemplated by this Agreement.

          5.  Assignment.  Neither this Agreement nor any of the rights,
interests or obligations hereunder shall be assigned by any of the parties
without the prior written consent of the other parties, except that Sub may
assign, in its sole discretion, any or all of its rights, interests and
obligations hereunder to Parent or to any direct or indirect wholly owned
subsidiary of Parent.  Subject to the preceding sentence, this Agreement will be
binding upon, inure to the benefit of and be enforceable by the parties and
their respective successors and assigns and, in the case of the Stockholder, the
heirs, executors and administrators of the Stockholder.

          6.  Termination.  Except as provided otherwise herein, this Agreement
shall terminate upon the earlier of (i) the Effective Time (as defined in the
Merger Agreement) and (ii) the termination of the Merger Agreement in accordance
with its terms.

                                      -3-
<PAGE>

          7.  General Provisions.

          (a)  Expenses.  Each party hereto shall pay its own expenses incurred
     in connection with this Agreement, except as specified in the Merger
     Agreement.

          (b)  Specific Performance.  The parties hereto agree that irreparable
     damage would occur in the event that any of the provisions of this
     Agreement were not performed in accordance with their specific terms or
     were otherwise breached.  It is accordingly agreed that the parties shall
     be entitled to an injunction or injunctions to prevent breaches of this
     Agreement and to enforce specifically the terms and provisions hereof in
     any court of the United States or any state thereof having jurisdiction,
     this being in addition to any other remedy to which they are entitled at
     law or in equity.  Each party hereby irrevocably submits to the exclusive
     jurisdiction of the United States District Court for the District of
     Delaware in any action, suit or proceeding arising in connection with this
     Agreement, and agrees that any such action, suit or proceeding shall be
     brought only in such courts (and waives any objection based on forum non
     conveniens or any other objection to venue therein).  Each party hereto
     waives any right to a trial by jury in connection with any such action,
     suit or proceeding.

          (c)  Notice.  All notices, requests, demands and other communications
     hereunder shall be deemed to have been duly given and made if in writing
     and if served by personal delivery upon the party for whom it is intended
     or if sent by telex or telecopier (and also confirmed in writing) to the
     person at the address set forth below, or such other address as may be
     designated in writing hereafter, in the same manner, by such person:

          (i)  if to Parent or Sub, to:

               Smith & Nephew, Inc.
               c/o Smith & Nephew plc
               2 Temple Place
               Victoria Embankment
               London WC2R 3BP
               Attention: Peter Huntley
               Facsimile No.: 171-240-1343

               with a copy to:

               Smith & Nephew, Inc.
               1450 Brooks Road
               Memphis, Tennessee 38116
               Attention: General Counsel
               Facsimile No.: 901-396-7824

                                      -4-
<PAGE>

               and to:

               Sidley & Austin
               One First National Plaza
               Chicago, Illinois 60603
               Attention: Dennis V. Osimitz
               Facsimile No.: 312-853-7036

          (ii) if to the Stockholder, to:

               Peter C. Madeja
               Genex Services, Inc.
               440 East Swedesford Road
               Suite 3050
               Wayne, PA 19087

               with a copy to:

               Brobeck, Phleger & Harrison LLP
               1633 Broadway
               NewYork, New York
               Attention: Ellen B. Corenswet
               Facsimile No.: 212-586-7878

          (d)  Parties in Interest.  This Agreement shall inure to the benefit
     of and be binding upon the parties named herein and their respective
     successors and assigns. Nothing in this Agreement, expressed or implied, is
     intended to confer upon any Person other than Parent, Sub or the
     Stockholder, or their permitted successors or assigns, any rights or
     remedies under or by reason of this Agreement.

          (e)  Entire Agreement; Amendments.  This Agreement contains the entire
     agreement between the parties hereto with respect to the subject matter
     hereof and supersedes all prior and contemporaneous agreements and
     understandings, oral or written, with respect to such transactions.  This
     Agreement may not be changed, amended or modified orally, but only by an
     agreement in writing signed by the party against whom any waiver, change,
     amendment, modification or discharge may be sought.

          (f)  Headings.  The section headings herein are for convenience only
     and shall not affect the construction of this Agreement.

          (g)  Counterparts.  This Agreement may be executed in one or more
     counterparts, each of which, when executed, shall be deemed to be an
     original and all of which together shall constitute one and the same
     document.

                                      -5-
<PAGE>

          (h)  Governing Law.  This Agreement shall be governed by, and
     construed in accordance with, the laws of the State of Delaware, regardless
     of the laws that might otherwise govern under applicable principles of
     conflicts of laws thereof.

          (i)  Capitalized Terms.  Capitalized terms not otherwise defined in
     this Agreement shall have the meanings set forth in the Merger Agreement.

          (j)  Severability.  If any term or other provision of this Agreement
     is invalid, illegal or incapable of being enforced by any rule of law, or
     public policy, all other conditions and provisions of this Agreement shall
     nevertheless remain in full force and effect so long as the economic and
     legal substance of the transactions contemplated hereby are not affected in
     any manner materially adverse to any party.  Upon such determination that
     any term or other provision is invalid, illegal or incapable of being
     enforced, the parties shall negotiate in good faith to modify this
     Agreement so as to effect the original intent of the parties as closely as
     possible in a mutually acceptable manner in order that the transactions
     contemplated by this Agreement may be consummated as originally
     contemplated to the fullest extent possible.

          8.   No Limitations on Actions of the Shareholder as a Director.
Notwithstanding anything to the contrary in this Agreement, nothing in this
Agreement is intended or shall be construed to require the Shareholder to take
or in any way limit any action that the Shareholder may take to discharge the
Shareholder's fiduciary duties as a director of the Company.

                                      -6-
<PAGE>

          IN WITNESS WHEREOF, each of Parent, Sub and the Stockholder has caused
this Agreement to be signed by its officer thereunto duly authorized and the
Stockholder has signed this Agreement, all as of the date first written above.


                         SMITH & NEPHEW, INC.



                         By:   /s/ Cliff Lomax
                               -------------------------
                                   Name: Cliff Lomax
                                   Title: Treasurer



                         SMITH & NEPHEW ACQUISITION, INC.



                         By: /s/ Cliff Lomax
                             ---------------------------
                                 Name: Cliff Lomax
                                 Title: Chairman


                         STOCKHOLDER



                         /s/ Peter C. Madeja
                         -------------------------------

                         Number of shares of Common Stock owned by the
                         Stockholder on the date hereof:

                              0
                         ------------

                         Options to purchase Common Stock held by the
                         Stockholder on the date hereof:

                            10,000
                         ------------

                                      -7-
<PAGE>

                                                                    Exhibit 2(e)

                             STOCKHOLDER AGREEMENT
                             ---------------------


          STOCKHOLDER AGREEMENT (this "Agreement"), dated as of July 25, 1999,
among Smith & Nephew, Inc., a Delaware corporation ("Parent"), Smith & Nephew
Acquisition, Inc., a Delaware corporation and a wholly owned subsidiary of
Parent ("Sub"), and the undersigned stockholder (the "Stockholder") of Exogen,
Inc., a Delaware corporation (the "Company").

          WHEREAS, Parent, Sub and the Company, propose to enter into an
Agreement and Plan of Merger dated as of even date herewith (as the same may be
amended or supplemented, the "Merger Agreement") to provide for the making of a
cash tender offer (as such offer may be amended from time to time, the "Offer")
by Sub for any and all shares of Common Stock, par value $.0001 per share, of
the Company (the "Common Stock") at the Offer Price (as defined in the Merger
Agreement) and the merger of the Company and Sub (the "Merger");

          WHEREAS, the Stockholder legally and/or beneficially owns that number
of shares of Common Stock appearing on the signature page hereof (such shares,
as they may be adjusted by any stock dividend, stock split, recapitalization,
combination or exchange of shares, merger, consolidation, reorganization or
other change or transaction of or by the Company (each, an "Adjustment Event")
being referred to herein as the "Subject Shares"); and

          WHEREAS, as a condition to their willingness to enter into the Merger
Agreement, Parent and Sub have requested that the Stockholder enter into this
Agreement;

          NOW, THEREFORE, to induce Parent and Sub to enter into, and in
consideration of their entering into, the Merger Agreement, and in consideration
of the premises and the representations, warranties and agreements contained
herein, the parties agree as follows:

          1.  Representations and Warranties of the Stockholder.  The
Stockholder hereby represents and warrants to Parent and Sub as follows:

          (a)  Authority.  The Stockholder has all requisite power and authority
     to enter into this Agreement and to consummate the transactions
     contemplated hereby.  This Agreement has been duly authorized, executed and
     delivered by the Stockholder and constitutes a valid and binding obligation
     of the Stockholder enforceable in accordance with its terms.  The execution
     and delivery of this Agreement does not, and the consummation of the
     transactions contemplated hereby and compliance with the terms hereof will
     not, conflict with, or result in any violation of, or default (with or
     without
<PAGE>

     notice or lapse of time or both) under any provision of, any trust
     agreement, loan or credit agreement, note, bond, mortgage, indenture, lease
     or other agreement, instrument, permit, concession, franchise, license,
     judgment, order, notice, decree, statute, law, ordinance, rule or
     regulation applicable to the Stockholder or to the Stockholder's property
     or assets. Except for the expiration or termination of the waiting period
     under the HSR Act and informational filings with the SEC, no consent,
     approval, order or authorization of, or registration, declaration or filing
     with, any court, administrative agency or commission or other governmental
     authority or instrumentality, domestic, foreign or supranational, is
     required by or with respect to the Stockholder in connection with the
     execution and delivery of this Agreement or the consummation by the
     Stockholder of the transactions contemplated hereby.

          (b)  The Shares.  The Stockholder has good and marketable title to the
     Subject Shares, free and clear of any claims, liens, encumbrances and
     security interests whatsoever.  The Stockholder owns no shares of Common
     Stock other than the Subject Shares.

          2.  Representations and Warranties of Parent and Sub.

          (a)  Authority.  Parent and Sub hereby represent and warrant to the
     Stockholder that each of Parent and Sub has all requisite corporate power
     and authority to enter into this Agreement and to consummate the
     transactions contemplated hereby. The execution and delivery of this
     Agreement by Parent and Sub, and the consummation of the transactions
     contemplated hereby, have been duly authorized by all necessary corporate
     action on the part of Parent and Sub.  This Agreement has been duly
     executed and delivered by Parent and Sub and constitutes a valid and
     binding obligation of Parent and Sub enforceable in accordance with its
     terms.

          3.  Covenants of the Stockholder.  The Stockholder agrees as follows:

          (a)  At any meeting of stockholders of the Company called to vote upon
     the Merger and the Merger Agreement or at any adjournment thereof or in any
     other circumstances upon which a vote, consent or other approval with
     respect to the Merger and the Merger Agreement is sought, the Stockholder
     shall vote (or cause to be voted) the Subject Shares in favor of the
     Merger, the approval of the Merger Agreement and the approval of the terms
     thereof and each of the other transactions contemplated by the Merger
     Agreement, provided that the terms of the Merger Agreement shall not have
     been amended to adversely affect the Stockholder.

          (b)  At any meeting of stockholders of the Company or at any
     adjournment thereof or in any other circumstances upon which the
     Stockholder's vote, consent or other approval is sought, the Stockholder
     shall vote (or cause to be voted) the Subject Shares against (i) any merger
     agreement or merger (other than the Merger Agreement and the

                                      -2-
<PAGE>

     Merger), consolidation, combination, sale of substantial assets,
     reorganization, recapitalization, dissolution, liquidation or winding up of
     or by the Company or any other Takeover Proposal or (ii) any amendment of
     the Company's articles of incorporation or by-laws or other proposal or
     transaction involving the Company or any of its subsidiaries, which
     amendment or other proposal or transaction would in any manner impede,
     frustrate, prevent or nullify the Merger, the Merger Agreement or any of
     the other transactions contemplated by the Merger Agreement.

          (c)  The Stockholder agrees not to (i) sell, transfer, pledge, assign
     or otherwise dispose of, or enter into any contract, option or other
     arrangement (including any profit sharing arrangement) with respect to the
     sale, transfer, pledge, assignment or other disposition of, the Subject
     Shares to any person other than Sub or Sub's designee or (ii) enter into
     any voting arrangement, whether by proxy, voting agreement or otherwise, in
     connection, directly or indirectly, with any Takeover Proposal.

          (d)  The Stockholder shall not, nor shall the Stockholder permit any
     investment banker, attorney or other adviser or representative of the
     Stockholder to, (i) directly or indirectly solicit, initiate or encourage
     the submission of, any Takeover Proposal or (ii) directly or indirectly
     participate in any discussions or negotiations regarding, or furnish to any
     person any information with respect to, or take any other action to
     facilitate any inquiries or the making of any proposal that constitutes, or
     may reasonably be expected to lead to, any Takeover Proposal.

          (e)  So long as the Merger Agreement has not been terminated, the
     Stockholder shall tender pursuant to the Offer, and not withdraw, all of
     the Subject Shares.

          4.  Further Assurances.  The Stockholder will, from time to time,
execute and deliver, or cause to be executed and delivered, such additional or
further transfers, assignments, endorsements, consents and other instruments as
Parent or Sub may reasonably request for the purpose of effectively carrying out
the transactions contemplated by this Agreement.

          5.  Assignment.  Neither this Agreement nor any of the rights,
interests or obligations hereunder shall be assigned by any of the parties
without the prior written consent of the other parties, except that Sub may
assign, in its sole discretion, any or all of its rights, interests and
obligations hereunder to Parent or to any direct or indirect wholly owned
subsidiary of Parent.  Subject to the preceding sentence, this Agreement will be
binding upon, inure to the benefit of and be enforceable by the parties and
their respective successors and assigns and, in the case of the Stockholder, the
heirs, executors and administrators of the Stockholder.

          6.  Termination.  Except as provided otherwise herein, this Agreement
shall terminate upon the earlier of (i) the Effective Time (as defined in the
Merger Agreement) and (ii) the termination of the Merger Agreement in accordance
with its terms.

                                      -3-
<PAGE>

          7.  General Provisions.

          (a)  Expenses.  Each party hereto shall pay its own expenses incurred
     in connection with this Agreement, except as specified in the Merger
     Agreement.

          (b)  Specific Performance.  The parties hereto agree that irreparable
     damage would occur in the event that any of the provisions of this
     Agreement were not performed in accordance with their specific terms or
     were otherwise breached.  It is accordingly agreed that the parties shall
     be entitled to an injunction or injunctions to prevent breaches of this
     Agreement and to enforce specifically the terms and provisions hereof in
     any court of the United States or any state thereof having jurisdiction,
     this being in addition to any other remedy to which they are entitled at
     law or in equity.  Each party hereby irrevocably submits to the exclusive
     jurisdiction of the United States District Court for the District of
     Delaware in any action, suit or proceeding arising in connection with this
     Agreement, and agrees that any such action, suit or proceeding shall be
     brought only in such courts (and waives any objection based on forum non
     conveniens or any other objection to venue therein).  Each party hereto
     waives any right to a trial by jury in connection with any such action,
     suit or proceeding.

          (c)  Notice.  All notices, requests, demands and other communications
     hereunder shall be deemed to have been duly given and made if in writing
     and if served by personal delivery upon the party for whom it is intended
     or if sent by telex or telecopier (and also confirmed in writing) to the
     person at the address set forth below, or such other address as may be
     designated in writing hereafter, in the same manner, by such person:

          (i)  if to Parent or Sub, to:

               Smith & Nephew, Inc.
               c/o Smith & Nephew plc
               2 Temple Place
               Victoria Embankment
               London WC2R 3BP
               Attention: Peter Huntley
               Facsimile No.: 171-240-1343

               with a copy to:

               Smith & Nephew, Inc.
               1450 Brooks Road
               Memphis, Tennessee 38116
               Attention: General Counsel
               Facsimile No.: 901-396-7824

                                      -4-
<PAGE>

               and to:

               Sidley & Austin
               One First National Plaza
               Chicago, Illinois 60603
               Attention: Dennis V. Osimitz
               Facsimile No.: 312-853-7036

          (ii) if to the Stockholder, to:

               David J. Ottensmeyer, M.D.
               102 Crofton Court
               Fairhope, AL 36532

               with a copy to:

               Brobeck, Phleger & Harrison LLP
               1633 Broadway
               New York, New York
               Attention: Ellen B. Corenswet
               Facsimile No.: 212-586-7878

          (d)  Parties in Interest.  This Agreement shall inure to the benefit
     of and be binding upon the parties named herein and their respective
     successors and assigns. Nothing in this Agreement, expressed or implied, is
     intended to confer upon any Person other than Parent, Sub or the
     Stockholder, or their permitted successors or assigns, any rights or
     remedies under or by reason of this Agreement.

          (e)  Entire Agreement; Amendments.  This Agreement contains the entire
     agreement between the parties hereto with respect to the subject matter
     hereof and supersedes all prior and contemporaneous agreements and
     understandings, oral or written, with respect to such transactions.  This
     Agreement may not be changed, amended or modified orally, but only by an
     agreement in writing signed by the party against whom any waiver, change,
     amendment, modification or discharge may be sought.

          (f)  Headings.  The section headings herein are for convenience only
     and shall not affect the construction of this Agreement.

          (g)  Counterparts.  This Agreement may be executed in one or more
     counterparts, each of which, when executed, shall be deemed to be an
     original and all of which together shall constitute one and the same
     document.

                                      -5-
<PAGE>

          (h)  Governing Law.  This Agreement shall be governed by, and
     construed in accordance with, the laws of the State of Delaware, regardless
     of the laws that might otherwise govern under applicable principles of
     conflicts of laws thereof.

          (i)  Capitalized Terms.  Capitalized terms not otherwise defined in
     this Agreement shall have the meanings set forth in the Merger Agreement.

          (j)  Severability.  If any term or other provision of this Agreement
     is invalid, illegal or incapable of being enforced by any rule of law, or
     public policy, all other conditions and provisions of this Agreement shall
     nevertheless remain in full force and effect so long as the economic and
     legal substance of the transactions contemplated hereby are not affected in
     any manner materially adverse to any party.  Upon such determination that
     any term or other provision is invalid, illegal or incapable of being
     enforced, the parties shall negotiate in good faith to modify this
     Agreement so as to effect the original intent of the parties as closely as
     possible in a mutually acceptable manner in order that the transactions
     contemplated by this Agreement may be consummated as originally
     contemplated to the fullest extent possible.

          8.   No Limitations on Actions of the Shareholder as a Director.
Notwithstanding anything to the contrary in this Agreement, nothing in this
Agreement is intended or shall be construed to require the Shareholder to take
or in any way limit any action that the Shareholder may take to discharge the
Shareholder's fiduciary duties as a director of the Company.

                                      -6-
<PAGE>

          IN WITNESS WHEREOF, each of Parent, Sub and the Stockholder has caused
this Agreement to be signed by its officer thereunto duly authorized and the
Stockholder has signed this Agreement, all as of the date first written above.


                         SMITH & NEPHEW, INC.



                         By:  /s/ Cliff Lomax
                              ---------------------------
                                  Name: Cliff Lomax
                                  Title: Treasurer



                         SMITH & NEPHEW ACQUISITION, INC.



                         By:  /s/ Cliff Lomax
                              ---------------------------
                                  Name: Cliff Lomax
                                  Title: Chairman


                         STOCKHOLDER



                         /s/ David J. Ottensmeyer
                         --------------------------------

                         Number of shares of Common Stock owned by the
                         Stockholder on the date hereof:

                              0
                         ------------

                         Options to purchase Common Stock held by the
                         Stockholder on the date hereof:

                            15,000
                         ------------

                                      -7-
<PAGE>

                                                                    Exhibit 2(f)


                             STOCKHOLDER AGREEMENT
                             ---------------------


          STOCKHOLDER AGREEMENT (this "Agreement"), dated as of July 25, 1999,
among Smith & Nephew, Inc., a Delaware corporation ("Parent"), Smith & Nephew
Acquisition, Inc., a Delaware corporation and a wholly owned subsidiary of
Parent ("Sub"), and the undersigned stockholder (the "Stockholder") of Exogen,
Inc., a Delaware corporation (the "Company").

          WHEREAS, Parent, Sub and the Company, propose to enter into an
Agreement and Plan of Merger dated as of even date herewith (as the same may be
amended or supplemented, the "Merger Agreement") to provide for the making of a
cash tender offer (as such offer may be amended from time to time, the "Offer")
by Sub for any and all shares of Common Stock, par value $.0001 per share, of
the Company (the "Common Stock") at the Offer Price (as defined in the Merger
Agreement) and the merger of the Company and Sub (the "Merger");

          WHEREAS, the Stockholder legally and/or beneficially owns that number
of shares of Common Stock appearing on the signature page hereof (such shares,
as they may be adjusted by any stock dividend, stock split, recapitalization,
combination or exchange of shares, merger, consolidation, reorganization or
other change or transaction of or by the Company (each, an "Adjustment Event")
being referred to herein as the "Subject Shares"); and

          WHEREAS, as a condition to their willingness to enter into the Merger
Agreement, Parent and Sub have requested that the Stockholder enter into this
Agreement;

          NOW, THEREFORE, to induce Parent and Sub to enter into, and in
consideration of their entering into, the Merger Agreement, and in consideration
of the premises and the representations, warranties and agreements contained
herein, the parties agree as follows:

          1.  Representations and Warranties of the Stockholder.  The
Stockholder hereby represents and warrants to Parent and Sub as follows:

          (a)  Authority.  The Stockholder has all requisite power and authority
     to enter into this Agreement and to consummate the transactions
     contemplated hereby.  This Agreement has been duly authorized, executed and
     delivered by the Stockholder and constitutes a valid and binding obligation
     of the Stockholder enforceable in accordance with its terms.  The execution
     and delivery of this Agreement does not, and the consummation of the
     transactions contemplated hereby and compliance with the terms hereof will
     not, conflict with, or result in any violation of, or default (with or
     without
<PAGE>

     notice or lapse of time or both) under any provision of, any trust
     agreement, loan or credit agreement, note, bond, mortgage, indenture, lease
     or other agreement, instrument, permit, concession, franchise, license,
     judgment, order, notice, decree, statute, law, ordinance, rule or
     regulation applicable to the Stockholder or to the Stockholder's property
     or assets. Except for the expiration or termination of the waiting period
     under the HSR Act and informational filings with the SEC, no consent,
     approval, order or authorization of, or registration, declaration or filing
     with, any court, administrative agency or commission or other governmental
     authority or instrumentality, domestic, foreign or supranational, is
     required by or with respect to the Stockholder in connection with the
     execution and delivery of this Agreement or the consummation by the
     Stockholder of the transactions contemplated hereby.

          (b)  The Shares.  The Stockholder has good and marketable title to the
     Subject Shares, free and clear of any claims, liens, encumbrances and
     security interests whatsoever.  The Stockholder owns no shares of Common
     Stock other than the Subject Shares.

          2.  Representations and Warranties of Parent and Sub.

          (a)  Authority.  Parent and Sub hereby represent and warrant to the
     Stockholder that each of Parent and Sub has all requisite corporate power
     and authority to enter into this Agreement and to consummate the
     transactions contemplated hereby. The execution and delivery of this
     Agreement by Parent and Sub, and the consummation of the transactions
     contemplated hereby, have been duly authorized by all necessary corporate
     action on the part of Parent and Sub.  This Agreement has been duly
     executed and delivered by Parent and Sub and constitutes a valid and
     binding obligation of Parent and Sub enforceable in accordance with its
     terms.

          3.  Covenants of the Stockholder.  The Stockholder agrees as follows:

          (a)  At any meeting of stockholders of the Company called to vote upon
     the Merger and the Merger Agreement or at any adjournment thereof or in any
     other circumstances upon which a vote, consent or other approval with
     respect to the Merger and the Merger Agreement is sought, the Stockholder
     shall vote (or cause to be voted) the Subject Shares in favor of the
     Merger, the approval of the Merger Agreement and the approval of the terms
     thereof and each of the other transactions contemplated by the Merger
     Agreement, provided that the terms of the Merger Agreement shall not have
     been amended to adversely affect the Stockholder.

          (b)  At any meeting of stockholders of the Company or at any
     adjournment thereof or in any other circumstances upon which the
     Stockholder's vote, consent or other approval is sought, the Stockholder
     shall vote (or cause to be voted) the Subject Shares against (i) any merger
     agreement or merger (other than the Merger Agreement and the

                                      -2-
<PAGE>

     Merger), consolidation, combination, sale of substantial assets,
     reorganization, recapitalization, dissolution, liquidation or winding up of
     or by the Company or any other Takeover Proposal or (ii) any amendment of
     the Company's articles of incorporation or by-laws or other proposal or
     transaction involving the Company or any of its subsidiaries, which
     amendment or other proposal or transaction would in any manner impede,
     frustrate, prevent or nullify the Merger, the Merger Agreement or any of
     the other transactions contemplated by the Merger Agreement.

          (c)  The Stockholder agrees not to (i) sell, transfer, pledge, assign
     or otherwise dispose of, or enter into any contract, option or other
     arrangement (including any profit sharing arrangement) with respect to the
     sale, transfer, pledge, assignment or other disposition of, the Subject
     Shares to any person other than Sub or Sub's designee or (ii) enter into
     any voting arrangement, whether by proxy, voting agreement or otherwise, in
     connection, directly or indirectly, with any Takeover Proposal.

          (d)  The Stockholder shall not, nor shall the Stockholder permit any
     investment banker, attorney or other adviser or representative of the
     Stockholder to, (i) directly or indirectly solicit, initiate or encourage
     the submission of, any Takeover Proposal or (ii) directly or indirectly
     participate in any discussions or negotiations regarding, or furnish to any
     person any information with respect to, or take any other action to
     facilitate any inquiries or the making of any proposal that constitutes, or
     may reasonably be expected to lead to, any Takeover Proposal.

          (e)  So long as the Merger Agreement has not been terminated, the
     Stockholder shall tender pursuant to the Offer, and not withdraw, all of
     the Subject Shares.

          4.  Further Assurances.  The Stockholder will, from time to time,
execute and deliver, or cause to be executed and delivered, such additional or
further transfers, assignments, endorsements, consents and other instruments as
Parent or Sub may reasonably request for the purpose of effectively carrying out
the transactions contemplated by this Agreement.

          5.  Assignment.  Neither this Agreement nor any of the rights,
interests or obligations hereunder shall be assigned by any of the parties
without the prior written consent of the other parties, except that Sub may
assign, in its sole discretion, any or all of its rights, interests and
obligations hereunder to Parent or to any direct or indirect wholly owned
subsidiary of Parent.  Subject to the preceding sentence, this Agreement will be
binding upon, inure to the benefit of and be enforceable by the parties and
their respective successors and assigns and, in the case of the Stockholder, the
heirs, executors and administrators of the Stockholder.

          6.  Termination.  Except as provided otherwise herein, this Agreement
shall terminate upon the earlier of (i) the Effective Time (as defined in the
Merger Agreement) and (ii) the termination of the Merger Agreement in accordance
with its terms.

                                      -3-
<PAGE>

          7.  General Provisions.

          (a)  Expenses.  Each party hereto shall pay its own expenses incurred
     in connection with this Agreement, except as specified in the Merger
     Agreement.

          (b)  Specific Performance.  The parties hereto agree that irreparable
     damage would occur in the event that any of the provisions of this
     Agreement were not performed in accordance with their specific terms or
     were otherwise breached.  It is accordingly agreed that the parties shall
     be entitled to an injunction or injunctions to prevent breaches of this
     Agreement and to enforce specifically the terms and provisions hereof in
     any court of the United States or any state thereof having jurisdiction,
     this being in addition to any other remedy to which they are entitled at
     law or in equity.  Each party hereby irrevocably submits to the exclusive
     jurisdiction of the United States District Court for the District of
     Delaware in any action, suit or proceeding arising in connection with this
     Agreement, and agrees that any such action, suit or proceeding shall be
     brought only in such courts (and waives any objection based on forum non
     conveniens or any other objection to venue therein).  Each party hereto
     waives any right to a trial by jury in connection with any such action,
     suit or proceeding.

          (c)  Notice.  All notices, requests, demands and other communications
     hereunder shall be deemed to have been duly given and made if in writing
     and if served by personal delivery upon the party for whom it is intended
     or if sent by telex or telecopier (and also confirmed in writing) to the
     person at the address set forth below, or such other address as may be
     designated in writing hereafter, in the same manner, by such person:

          (i)  if to Parent or Sub, to:

               Smith & Nephew, Inc.
               c/o Smith & Nephew plc
               2 Temple Place
               Victoria Embankment
               London WC2R 3BP
               Attention: Peter Huntley
               Facsimile No.: 171-240-1343

               with a copy to:

               Smith & Nephew, Inc.
               1450 Brooks Road
               Memphis, Tennessee 38116
               Attention: General Counsel
               Facsimile No.: 901-396-7824

                                      -4-
<PAGE>

               and to:

               Sidley & Austin
               One First National Plaza
               Chicago, Illinois 60603
               Attention: Dennis V. Osimitz
               Facsimile No.: 312-853-7036

          (ii) if to the Stockholder, to:

               Terence D. Wall
               Vital Signs
               20 Campus Road
               Totowa, New Jersey 07512

               with a copy to:

               Brobeck, Phleger & Harrison LLP
               1633 Broadway
               New York, New York
               Attention: Ellen B. Corenswet
               Facsimile No.: 212-586-7878

          (d)  Parties in Interest.  This Agreement shall inure to the benefit
     of and be binding upon the parties named herein and their respective
     successors and assigns. Nothing in this Agreement, expressed or implied, is
     intended to confer upon any Person other than Parent, Sub or the
     Stockholder, or their permitted successors or assigns, any rights or
     remedies under or by reason of this Agreement.

          (e)  Entire Agreement; Amendments.  This Agreement contains the entire
     agreement between the parties hereto with respect to the subject matter
     hereof and supersedes all prior and contemporaneous agreements and
     understandings, oral or written, with respect to such transactions.  This
     Agreement may not be changed, amended or modified orally, but only by an
     agreement in writing signed by the party against whom any waiver, change,
     amendment, modification or discharge may be sought.

          (f)  Headings.  The section headings herein are for convenience only
     and shall not affect the construction of this Agreement.

          (g)  Counterparts.  This Agreement may be executed in one or more
     counterparts, each of which, when executed, shall be deemed to be an
     original and all of which together shall constitute one and the same
     document.

                                      -5-
<PAGE>

          (h)  Governing Law.  This Agreement shall be governed by, and
     construed in accordance with, the laws of the State of Delaware, regardless
     of the laws that might otherwise govern under applicable principles of
     conflicts of laws thereof.

          (i)  Capitalized Terms.  Capitalized terms not otherwise defined in
     this Agreement shall have the meanings set forth in the Merger Agreement.

          (j)  Severability.  If any term or other provision of this Agreement
     is invalid, illegal or incapable of being enforced by any rule of law, or
     public policy, all other conditions and provisions of this Agreement shall
     nevertheless remain in full force and effect so long as the economic and
     legal substance of the transactions contemplated hereby are not affected in
     any manner materially adverse to any party.  Upon such determination that
     any term or other provision is invalid, illegal or incapable of being
     enforced, the parties shall negotiate in good faith to modify this
     Agreement so as to effect the original intent of the parties as closely as
     possible in a mutually acceptable manner in order that the transactions
     contemplated by this Agreement may be consummated as originally
     contemplated to the fullest extent possible.

          8.   No Limitations on Actions of the Shareholder as a Director.
Notwithstanding anything to the contrary in this Agreement, nothing in this
Agreement is intended or shall be construed to require the Shareholder to take
or in any way limit any action that the Shareholder may take to discharge the
Shareholder's fiduciary duties as a director of the Company.

                                      -6-
<PAGE>

          IN WITNESS WHEREOF, each of Parent, Sub and the Stockholder has caused
this Agreement to be signed by its officer thereunto duly authorized and the
Stockholder has signed this Agreement, all as of the date first written above.


                         SMITH & NEPHEW, INC.



                         By: /s/ Cliff Lomax
                             ---------------------------
                                 Name: Cliff Lomax
                                 Title: Treasurer



                         SMITH & NEPHEW ACQUISITION, INC.



                         By: /s/ Cliff Lomax
                             ---------------------------
                                 Name: Cliff Lomax
                                 Title: Chairman


                         STOCKHOLDER



                         /s/ Terence D. Wall
                         -------------------------------

                         Number of shares of Common Stock owned by the
                         Stockholder on the date hereof:

                            48,485
                         ------------

                         Options to purchase Common Stock held by the
                         Stockholder on the date hereof:

                             5,000
                         ------------

                                      -7-
<PAGE>

                                                                    Exhibit 2(g)

                             STOCKHOLDER AGREEMENT
                             ---------------------


          STOCKHOLDER AGREEMENT (this "Agreement"), dated as of July 25, 1999,
among Smith & Nephew, Inc., a Delaware corporation ("Parent"), Smith & Nephew
Acquisition, Inc., a Delaware corporation and a wholly owned subsidiary of
Parent ("Sub"), and the undersigned stockholder (the "Stockholder") of Exogen,
Inc., a Delaware corporation (the "Company").

          WHEREAS, Parent, Sub and the Company, propose to enter into an
Agreement and Plan of Merger dated as of even date herewith (as the same may be
amended or supplemented, the "Merger Agreement") to provide for the making of a
cash tender offer (as such offer may be amended from time to time, the "Offer")
by Sub for any and all shares of Common Stock, par value $.0001 per share, of
the Company (the "Common Stock") at the Offer Price (as defined in the Merger
Agreement) and the merger of the Company and Sub (the "Merger");

          WHEREAS, the Stockholder legally and/or beneficially owns that number
of shares of Common Stock appearing on the signature page hereof (such shares,
as they may be adjusted by any stock dividend, stock split, recapitalization,
combination or exchange of shares, merger, consolidation, reorganization or
other change or transaction of or by the Company (each, an "Adjustment Event")
being referred to herein as the "Subject Shares"); and

          WHEREAS, as a condition to their willingness to enter into the Merger
Agreement, Parent and Sub have requested that the Stockholder enter into this
Agreement;

          NOW, THEREFORE, to induce Parent and Sub to enter into, and in
consideration of their entering into, the Merger Agreement, and in consideration
of the premises and the representations, warranties and agreements contained
herein, the parties agree as follows:

          1.  Representations and Warranties of the Stockholder.  The
Stockholder hereby represents and warrants to Parent and Sub as follows:

          (a)  Authority.  The Stockholder has all requisite power and authority
     to enter into this Agreement and to consummate the transactions
     contemplated hereby.  This Agreement has been duly authorized, executed and
     delivered by the Stockholder and constitutes a valid and binding obligation
     of the Stockholder enforceable in accordance with its terms.  The execution
     and delivery of this Agreement does not, and the consummation of the
     transactions contemplated hereby and compliance with the terms hereof will
     not, conflict with, or result in any violation of, or default (with or
     without
<PAGE>

     notice or lapse of time or both) under any provision of, any trust
     agreement, loan or credit agreement, note, bond, mortgage, indenture, lease
     or other agreement, instrument, permit, concession, franchise, license,
     judgment, order, notice, decree, statute, law, ordinance, rule or
     regulation applicable to the Stockholder or to the Stockholder's property
     or assets. Except for the expiration or termination of the waiting period
     under the HSR Act and informational filings with the SEC, no consent,
     approval, order or authorization of, or registration, declaration or filing
     with, any court, administrative agency or commission or other governmental
     authority or instrumentality, domestic, foreign or supranational, is
     required by or with respect to the Stockholder in connection with the
     execution and delivery of this Agreement or the consummation by the
     Stockholder of the transactions contemplated hereby.

          (b)  The Shares.  The Stockholder has good and marketable title to the
     Subject Shares, free and clear of any claims, liens, encumbrances and
     security interests whatsoever.  The Stockholder owns no shares of Common
     Stock other than the Subject Shares.

          2.  Representations and Warranties of Parent and Sub.

          (a)  Authority.  Parent and Sub hereby represent and warrant to the
     Stockholder that each of Parent and Sub has all requisite corporate power
     and authority to enter into this Agreement and to consummate the
     transactions contemplated hereby.  The execution and delivery of this
     Agreement by Parent and Sub, and the consummation of the transactions
     contemplated hereby, have been duly authorized by all necessary corporate
     action on the part of Parent and Sub.  This Agreement has been duly
     executed and delivered by Parent and Sub and constitutes a valid and
     binding obligation of Parent and Sub enforceable in accordance with its
     terms.

          3.  Covenants of the Stockholder.  The Stockholder agrees as follows:

          (a)  At any meeting of stockholders of the Company called to vote upon
     the Merger and the Merger Agreement or at any adjournment thereof or in any
     other circumstances upon which a vote, consent or other approval with
     respect to the Merger and the Merger Agreement is sought, the Stockholder
     shall vote (or cause to be voted) the Subject Shares in favor of the
     Merger, the approval of the Merger Agreement and the approval of the terms
     thereof and each of the other transactions contemplated by the Merger
     Agreement, provided that the terms of the Merger Agreement shall not have
     been amended to adversely affect the Stockholder.

          (b)  At any meeting of stockholders of the Company or at any
     adjournment thereof or in any other circumstances upon which the
     Stockholder's vote, consent or other approval is sought, the Stockholder
     shall vote (or cause to be voted) the Subject Shares against (i) any merger
     agreement or merger (other than the Merger Agreement and the

                                      -2-
<PAGE>

     Merger), consolidation, combination, sale of substantial assets,
     reorganization, recapitalization, dissolution, liquidation or winding up of
     or by the Company or any other Takeover Proposal or (ii) any amendment of
     the Company's articles of incorporation or by-laws or other proposal or
     transaction involving the Company or any of its subsidiaries, which
     amendment or other proposal or transaction would in any manner impede,
     frustrate, prevent or nullify the Merger, the Merger Agreement or any of
     the other transactions contemplated by the Merger Agreement.

          (c)  The Stockholder agrees not to (i) sell, transfer, pledge, assign
     or otherwise dispose of, or enter into any contract, option or other
     arrangement (including any profit sharing arrangement) with respect to the
     sale, transfer, pledge, assignment or other disposition of, the Subject
     Shares to any person other than Sub or Sub's designee or (ii) enter into
     any voting arrangement, whether by proxy, voting agreement or otherwise, in
     connection, directly or indirectly, with any Takeover Proposal.

          (d)  The Stockholder shall not, nor shall the Stockholder permit any
     investment banker, attorney or other adviser or representative of the
     Stockholder to, (i) directly or indirectly solicit, initiate or encourage
     the submission of, any Takeover Proposal or (ii) directly or indirectly
     participate in any discussions or negotiations regarding, or furnish to any
     person any information with respect to, or take any other action to
     facilitate any inquiries or the making of any proposal that constitutes, or
     may reasonably be expected to lead to, any Takeover Proposal.

          (e)  So long as the Merger Agreement has not been terminated, the
     Stockholder shall tender pursuant to the Offer, and not withdraw, all of
     the Subject Shares.

          4.  Further Assurances.  The Stockholder will, from time to time,
execute and deliver, or cause to be executed and delivered, such additional or
further transfers, assignments, endorsements, consents and other instruments as
Parent or Sub may reasonably request for the purpose of effectively carrying out
the transactions contemplated by this Agreement.

          5.  Assignment.  Neither this Agreement nor any of the rights,
interests or obligations hereunder shall be assigned by any of the parties
without the prior written consent of the other parties, except that Sub may
assign, in its sole discretion, any or all of its rights, interests and
obligations hereunder to Parent or to any direct or indirect wholly owned
subsidiary of Parent.  Subject to the preceding sentence, this Agreement will be
binding upon, inure to the benefit of and be enforceable by the parties and
their respective successors and assigns and, in the case of the Stockholder, the
heirs, executors and administrators of the Stockholder.

          6.  Termination.  Except as provided otherwise herein, this Agreement
shall terminate upon the earlier of (i) the Effective Time (as defined in the
Merger Agreement) and (ii) the termination of the Merger Agreement in accordance
with its terms.

                                      -3-
<PAGE>

          7.  General Provisions.

          (a)  Expenses.  Each party hereto shall pay its own expenses incurred
     in connection with this Agreement, except as specified in the Merger
     Agreement.

          (b)  Specific Performance.  The parties hereto agree that irreparable
     damage would occur in the event that any of the provisions of this
     Agreement were not performed in accordance with their specific terms or
     were otherwise breached.  It is accordingly agreed that the parties shall
     be entitled to an injunction or injunctions to prevent breaches of this
     Agreement and to enforce specifically the terms and provisions hereof in
     any court of the United States or any state thereof having jurisdiction,
     this being in addition to any other remedy to which they are entitled at
     law or in equity.  Each party hereby irrevocably submits to the exclusive
     jurisdiction of the United States District Court for the District of
     Delaware in any action, suit or proceeding arising in connection with this
     Agreement, and agrees that any such action, suit or proceeding shall be
     brought only in such courts (and waives any objection based on forum non
     conveniens or any other objection to venue therein).  Each party hereto
     waives any right to a trial by jury in connection with any such action,
     suit or proceeding.

          (c)  Notice.  All notices, requests, demands and other communications
     hereunder shall be deemed to have been duly given and made if in writing
     and if served by personal delivery upon the party for whom it is intended
     or if sent by telex or telecopier (and also confirmed in writing) to the
     person at the address set forth below, or such other address as may be
     designated in writing hereafter, in the same manner, by such person:

          (i)  if to Parent or Sub, to:

               Smith & Nephew, Inc.
               c/o Smith & Nephew plc
               2 Temple Place
               Victoria Embankment
               London WC2R 3BP
               Attention: Peter Huntley
               Facsimile No.: 171-240-1343

               with a copy to:

               Smith & Nephew, Inc.
               1450 Brooks Road
               Memphis, Tennessee 38116
               Attention: General Counsel
               Facsimile No.: 901-396-7824

                                      -4-
<PAGE>

               and to:

               Sidley & Austin
               One First National Plaza
               Chicago, Illinois 60603
               Attention: Dennis V. Osimitz
               Facsimile No.: 312- 853-7036

          (ii) if to the Stockholder, to:

               Patrick A. McBrayer
               Exogen, Inc.
               10 Constitution Avenue
               P.O. Box 6860
               Pisoataway, NJ 08855

               with a copy to:

               Brobeck, Phleger & Harrison LLP
               1633 Broadway
               NewYork, New York
               Attention: Ellen B. Corenswet
               Facsimile No.: 212-586-7878

          (d)  Parties in Interest.  This Agreement shall inure to the benefit
     of and be binding upon the parties named herein and their respective
     successors and assigns. Nothing in this Agreement, expressed or implied, is
     intended to confer upon any Person other than Parent, Sub or the
     Stockholder, or their permitted successors or assigns, any rights or
     remedies under or by reason of this Agreement.

          (e)  Entire Agreement; Amendments.  This Agreement contains the entire
     agreement between the parties hereto with respect to the subject matter
     hereof and supersedes all prior and contemporaneous agreements and
     understandings, oral or written, with respect to such transactions.  This
     Agreement may not be changed, amended or modified orally, but only by an
     agreement in writing signed by the party against whom any waiver, change,
     amendment, modification or discharge may be sought.

          (f)  Headings.  The section headings herein are for convenience only
     and shall not affect the construction of this Agreement.

                                      -5-
<PAGE>

          (g)  Counterparts.  This Agreement may be executed in one or more
     counterparts, each of which, when executed, shall be deemed to be an
     original and all of which together shall constitute one and the same
     document.

          (h)  Governing Law.  This Agreement shall be governed by, and
     construed in accordance with, the laws of the State of Delaware, regardless
     of the laws that might otherwise govern under applicable principles of
     conflicts of laws thereof.

          (i)  Capitalized Terms.  Capitalized terms not otherwise defined in
     this Agreement shall have the meanings set forth in the Merger Agreement.

          (j)  Severability.  If any term or other provision of this Agreement
     is invalid, illegal or incapable of being enforced by any rule of law, or
     public policy, all other conditions and provisions of this Agreement shall
     nevertheless remain in full force and effect so long as the economic and
     legal substance of the transactions contemplated hereby are not affected in
     any manner materially adverse to any party.  Upon such determination that
     any term or other provision is invalid, illegal or incapable of being
     enforced, the parties shall negotiate in good faith to modify this
     Agreement so as to effect the original intent of the parties as closely as
     possible in a mutually acceptable manner in order that the transactions
     contemplated by this Agreement may be consummated as originally
     contemplated to the fullest extent possible.

          8.   No Limitations on Actions of the Shareholder as a Director.
Notwithstanding anything to the contrary in this Agreement, nothing in this
Agreement is intended or shall be construed to require the Shareholder to take
or in any way limit any action that the Shareholder may take to discharge the
Shareholder's fiduciary duties as a director of the Company.

                                      -6-
<PAGE>

          IN WITNESS WHEREOF, each of Parent, Sub and the Stockholder has caused
this Agreement to be signed by its officer thereunto duly authorized and the
Stockholder has signed this Agreement, all as of the date first written above.


                         SMITH & NEPHEW, INC.



                         By:  /s/ Cliff Lomax
                              -------------------------------
                                  Name: Cliff Lomax
                                  Title: Treasurer



                         SMITH & NEPHEW ACQUISITION, INC.



                         By: /s/ Cliff Lomax
                             --------------------------------
                                 Name: Cliff Lomax
                                 Title: Chairman


                         STOCKHOLDER



                         /s/ Patrick A. McBrayer
                         ------------------------------------

                         Number of shares of Common Stock owned by the
                         Stockholder on the date hereof:

                             291,000
                         ---------------

                         Options to purchase Common Stock held by the
                         Stockholder on the date hereof:

                             150,000
                         ---------------

                                      -7-

<PAGE>

                                                                       Exhibit 3

The Board of Directors
Exogen, Inc.
10 Constitution Avenue
Piscataway, NJ  08855

Members of the Board:

You have requested our opinion as to the fairness, from a financial point of
view, to the holders of common stock (the "Common Stock") of Exogen, Inc.
("Exogen") of the proposed cash consideration to be paid pursuant to an
Agreement and Plan of Merger (the "Agreement"), among Smith & Nephew
Acquisition, Inc. ("Purchaser"), a wholly owned subsidiary of Smith & Nephew,
Inc., and Exogen.  Pursuant to the Agreement, Purchaser would make a cash tender
offer ("Tender Offer") for all of the outstanding Common Stock at a purchase
price of $5.15 per share.  Following completion of the Tender Offer, Purchaser
would be merged into Exogen (the "Merger") and each outstanding share of Common
Stock would be converted into the right to receive $5.15 in cash.  The terms and
conditions of the Tender Offer and Merger (collectively, the "Transaction") are
more fully set forth in the Agreement.

U.S. Bancorp Piper Jaffray Inc., as a customary part of its investment banking
business, is engaged in the valuation of businesses and their securities in
connection with mergers and acquisitions, underwriting and secondary
distributions of securities, private placements and valuations for estate,
corporate and other purposes. We have acted as exclusive financial advisor to
Exogen in connection with the Agreement and will receive a fee for our services
which is contingent upon consummation of the Agreement.  In addition, we will
receive a separate fee for providing this opinion.  This opinion fee is not
contingent upon the consummation of the Agreement. Exogen has also agreed to
indemnify us against certain liabilities in connection with our services. We
make a market in the Common Stock and provide research coverage for Exogen. We
acted as co-manager of the initial public offering of the Common Stock on July
20, 1995. In the ordinary course of our business, we and our affiliates may
actively trade securities of Exogen for our own account or the account of our
customers and, accordingly, may at any time hold a long or short position in
such securities.
<PAGE>

Exogen, Inc.
July 25, 1999
Page 2


In arriving at our opinion, we have undertaken such review, analyses and
inquiries as we deemed necessary and appropriate under the circumstances.  Among
other things, we have reviewed (i) a draft copy of the Agreement and Plan of
Merger dated July 25, 1999, (ii) certain financial, operating, business and
other information relative to Exogen, (iii) certain internal financial
information of Exogen on a stand-alone basis furnished by the management of
Exogen, (iv) to the extent publicly available, the stock price premiums paid and
financial terms of certain acquisition transactions involving companies
operating in industries in which Exogen operates and operating performance and
valuation analyses of selected public companies deemed comparable to Exogen, and
(v) certain publicly available market and securities data of Exogen. In
addition, we had discussions with members of the management of Exogen concerning
the financial condition, current operating results and business outlook for
Exogen on a stand-alone basis.

We have relied upon and assumed the accuracy, completeness and fairness of the
financial statements and other information provided to us by Exogen, or
otherwise made available to us, and have not assumed responsibility for the
independent verification of such information. We have relied upon the assurances
of the management of  Exogen that the information provided to us by Exogen has
been prepared on a reasonable basis, and, with respect to financial planning
data and other business outlook information, reflects the best currently
available estimates, and that they are not aware of any information or facts
that would make the information provided to us incomplete or misleading.

In arriving at our opinion, we have not performed any appraisals or valuations
of any specific assets or liabilities of Exogen, and have not been furnished
with any such appraisals or valuations.  We express no opinion regarding the
liquidation value of any entity.

This opinion is necessarily based upon the information available to us and facts
and circumstances as they exist and are subject to evaluation on the date
hereof; events occurring after the date hereof could materially affect the
assumptions used in preparing this opinion.  We are not expressing any opinion
herein as to the price at which shares of Common Stock have traded or may trade
at any future time.  We have not undertaken to reaffirm or revise this opinion
or otherwise comment upon any events occurring after the date hereof and do not
have any obligation to update, revise or reaffirm this opinion.
<PAGE>

Exogen, Inc.
July 25, 1999
Page 3


This opinion is directed to the Board of Directors of Exogen and is not intended
to be and does not constitute a recommendation to any shareholder. We were not
requested to opine as to, and this opinion does not address, the basic business
decision to proceed with or effect the Transaction. This opinion shall not be
published or otherwise used, nor shall any public references to us be made,
without our prior written approval.


Based upon and subject to the foregoing and based upon such other factors as we
consider

relevant, it is our opinion that the  $5.15 per share in cash proposed to be
received in the Transaction by the stockholders of Exogen (other than Purchaser,
Smith & Nephew and their affiliates) pursuant to such Agreement is fair, from a
financial point of view, to such stockholders as of the date hereof.

Sincerely,


U.S. BANCORP PIPER JAFFRAY INC.

<PAGE>


[Smith & Nephew logo]                                                  Exhibit 4

                                                           FOR IMMEDIATE RELEASE
                                                           ---------------------
                                                                   July 30, 1999

                     Smith & Nephew Commences Tender Offer
                                For Exogen, Inc.

Memphis, Tennessee - July 30, 1999 - Smith & Nephew, Inc., today announced that
one of its wholly-owned subsidiaries has commenced its previously announced
tender offer for all of the outstanding shares of common stock, $.0001 par
value, of Exogen, Inc. (NASDAQ: EXGN) at $5.15 per share, net to the seller, in
cash.

Exogen, headquartered in Piscataway, New Jersey, designs, develops,
manufactures, and markets medical devices for the non-invasive treatment of
musculoskeletal injury and disease.  Exogen's proprietary ultrasound and
mechanical stress technologies are based on the well-established principle that
bone growth is stimulated by mechanical force.  Exogen markets and sells its
Sonic Accelerated Fracture Healing System device primarily in the United States,
Europe and Japan.

The tender offer is being made pursuant to an Agreement and Plan of Merger dated
as of July 25, 1999.  The tender offer will expire at 12:00 midnight, New York
City time (EDT), on Thursday, August 26, 1999, unless extended.

The offer is conditioned upon, among other things, there being validly tendered
and not withdrawn a number of shares that together with the shares currently
owned by an affiliate of Smith & Nephew equals at least a majority of the
outstanding shares on a fully diluted basis.

Registrar and Transfer Company is the depositary for the tender offer.
ChaseMellon Shareholder Services, L.L.C. is the information agent.  Chase
Securities Inc. is the Dealer Manager.

Smith & Nephew plc is a global healthcare company that markets a wide range of
technologically advanced products principally in the areas of orthopaedics,
endoscopy and wound management.   The Company and its affiliates have
approximately 12,000 employees in 36 countries, including about 3,500 in the
U.S.

Any questions or requests for assistance, or for additional copies of the Offer
to Purchase, the Letter of Transmittal, or the Notice of Guaranteed Delivery
related to the offer, may be directed to the information agent at 1-800-684-8823
or the dealer manager at 1-212-270-3722.


                                     # # #



<PAGE>
                                                                       Exhibit 5

                         [LETTERHEAD OF EXOGEN, INC.]



                                                                   July 30, 1999

Dear Stockholder:

   I am pleased to report that on July 25, 1999, Exogen, Inc. (the "Company")
entered into a merger agreement with Smith & Nephew, Inc. and one of its
subsidiaries that provides for the acquisition of the Company by Smith & Nephew
Acquisition, Inc. at a price of $5.15 per share in cash. Under the terms of the
proposed transaction, Smith & Nephew Acquisition, Inc. has made a tender offer
for all outstanding shares of the Company's common stock at $5.15 per share in
cash.

   Your Board of Directors has unanimously approved the merger agreement and
the offer, and has determined that the terms of the offer and the merger are
fair to and in the best interests of the Company's stockholders. Accordingly,
the Board of Directors unanimously recommends that all Company stockholders
accept the offer and tender their shares to Smith & Nephew Acquisition, Inc.

   In arriving at its recommendations, the Board of Directors gave careful
consideration to a number of factors. These factors included the opinion of
U.S. Bancorp Piper Jaffray Inc., financial advisor to the Company, that the
cash consideration of $5.15 per share to be received by the stockholders (other
than Purchaser, Parent and their affiliates) pursuant to the offer and the
merger is fair to the Company's stockholders from a financial point of view.

   Following the successful completion of the tender offer, upon approval by
stockholder vote, if required, the Smith & Nephew, Inc. subsidiary and the
Company will merge, and all Company shares not purchased in the offer will be
converted into the right to receive $5.15 per share in cash in the merger.

   Accompanying this letter is a copy of the Company's
Solicitation/Recommendation Statement on Schedule 14D-9. Also enclosed is the
Offer to Purchase and related materials, including a Letter of Transmittal for
use in tendering shares. We urge you to read the enclosed materials carefully.

   On behalf of the Board of Directors,

                                        Sincerely,
                                        /s/ Patrick A. McBrayer
                                        Patrick A. McBrayer
                                        President and Chief Executive Officer


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