EXOGEN INC
8-K, 1998-09-23
ELECTROMEDICAL & ELECTROTHERAPEUTIC APPARATUS
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                       SECURITIES AND EXCHANGE COMMISSION
                              Washington, DC 20549


                                    FORM 8-K


                                 CURRENT REPORT



                     Pursuant to Section 13 or 15(d) of the
                         Securities Exchange Act of 1934



                Date of Report (Date of earliest event reported)
                                 August 10, 1998



                                  Exogen, Inc.
- --------------------------------------------------------------------------------

             (Exact name of Registrant as specified in its Charter)

                                    Delaware
- --------------------------------------------------------------------------------

                 (State or other jurisdiction of incorporation)

            000-26154                               22-3208468 
- -------------------------------------------------------------------------------
   (Commission File Number)             (IRS Employer Identification Number)
                                             

10 Constitution Avenue, P.O. Box 6860, Piscataway, NJ               08855
- --------------------------------------------------------------------------------
(Address of principal executive offices)                         (Zip Code)

                                 (732) 981-0990
              Registrant's telephone number, including area code:
- --------------------------------------------------------------------------------


                                       N/A
- --------------------------------------------------------------------------------
         (Former name or former address, if changed since last report)
<PAGE>
Item 7.  Financial Statements  and Exhibits

         (c)      Exhibits

         10.22+   Master Agreement,  dated August 10, 1998,  between the Company
                  and Smith & Nephew, Inc.

         10.23+   Common  Stock  Purchase  Agreement,  dated  August  10,  1998,
                  between the Company and Smith & Nephew Holdings, Inc.

         10.24+   United States Sales Representative Agreement, dated August 10,
                  1998, between the Company and Smith & Nephew, Inc.

         10.25+   License Agreement,  dated August 10, 1998, between the Company
                  and Smith & Nephew, Inc.
- ------------
+ The Company has applied for Confidential Treatment of portions of this exhibit
pursuant to Rule 24b-2 under the Securities Exchange Act of 1934, as amended.

<PAGE>
                                   SIGNATURES


         Pursuant to the  requirements  of the Securities  Exchange Act of 1934,
the  Registrant  has duly  caused  this report to be signed on its behalf by the
undersigned, hereto duly authorized.



                                          EXOGEN, INC.
                                          (Registrant)

                                          /s/Patrick A. McBrayer
                                          ------------------------------------
Date: September 23, 1998               By:Patrick A. McBrayer
                                          President and Chief Executive Officer


                                                                   EXHIBIT 10.22

                                        CONFIDENTIAL  TREATMENT  HAS BEEN SOUGHT
                     FOR  PORTIONS OF THIS  EXHIBIT PURSUANT TO RULE 24B-2 UNDER
                             THE  SECURITIES  EXCHANGE  ACT OF 1934, AS AMENDED.






                                  EXOGEN, INC.


                                       AND


                              SMITH & NEPHEW, INC.


                                MASTER AGREEMENT


                                 August 10, 1998









<PAGE>
                                TABLE OF CONTENTS


                                                                         PAGE
                                                                         ----

SECTION 1.          Purchase of Exogen Common Stock by S&N..................1

SECTION 2.          United States Sales Representative Agreement............1

SECTION 3.          Payment on Initial Payment Date.........................2

SECTION 4.          License Agreement.......................................2

SECTION 5.          United States Stocking Distribution Agreement...........2

SECTION 6.          Global Stocking Distribution Agreement; 
                    Option to Purchase Additional Shares of
                    Exogen Common Stock.....................................3

SECTION 7.          Certain Rights of First Negotiation.....................6

SECTION 8.          Certain Covenants of Exogen.............................7

SECTION 9.          Certain Covenants of S&N...............................10

SECTION 10.         Representations and Warranties of Exogen...............12

                    10.1     Power and Authority...........................12
                                                                            
                    10.2     Valid Issuance of Exogen Common Stock.........12
                                                                           
                    10.3     Consents......................................13
                                                                           
                    10.4     Compliance with Other Instruments.............13
                                                                            
                    10.5     ISO 9000 and CE Mark of Approval..............13
                                                                            
                    10.6     Millenium Compliance..........................13
                                                                            
SECTION 11.         Representations and Warranties of S&N..................14

                    11.1     Power and Authority...........................14
                                                                           
                    11.2     Consents......................................14
                                                                            
                    11.3     Compliance with Other Instruments.............14
                                                                           
SECTION 12.         Miscellaneous..........................................14

                    12.1     Survival of Warranties........................14
<PAGE>                                                                        
                    12.2     Deductible....................................14
                                                                            
                    12.3     Claim Notice..................................15
                                                                            
                    12.4     Remedies......................................15
                                                                            
                    12.5     Successors and Assigns........................15
                                                                            
                    12.6     Governing Law.................................16
                                                                           
                    12.7     Counterparts..................................16
                                                                            
                    12.8     Titles and Subtitles..........................16
                                                                            
                    12.9     Notices.......................................16
                                                                            
                    12.10    Attorneys' Fees...............................16
                                                                            

                    12.11    Amendments and Waivers........................16

                    12.12    Severability..................................16
                                                                           
                    12.13    Entire Agreement..............................16
                                                                            
                    12.14    Press Releases and Announcements..............17
                                                                            
                    12.15    Arbitration...................................17 
                                                                            
<PAGE>
                                    SCHEDULES


SCHEDULE 5     Terms and Conditions of U.S. Stocking Distribution Agreement

SCHEDULE 6A    Terms and Conditions of Global Stocking Distribution Agreement

SCHEDULE 6B    Terms and Conditions of Individual Country Stocking Distribution 
               Agreement (Prior to Exercise of Global Distribution Option)

SCHEDULE 7     Terms and Conditions to Serve as the Basis for Good Faith 
               Negotiations

SCHEDULE 8     U.S. and Foreign Patents, Trademarks and Applications

SCHEDULE 9     Current International Arrangements

SCHEDULE 10    Required Consents


<PAGE>
                                    EXHIBITS


EXHIBIT A                  Common Stock Purchase Agreement

EXHIBIT B                  U.S. Sales Representative Agreement

EXHIBIT C                  License Agreement



<PAGE>
                                MASTER AGREEMENT


                  Master  Agreement  ("Agreement")  dated as of August 10,  1998
between Exogen,  Inc., a Delaware  corporation  ("Exogen"),  and Smith & Nephew,
Inc., a Delaware corporation ("S&N").

                                    RECITALS

                  WHEREAS,  Exogen  manufactures  and  sells  Sonic  Accelerated
Fracture Health Systems ("SAFHS"); and

                  WHEREAS,  S&N  desires  to  acquire  certain  rights  from and
interests in Exogen.

                  NOW,  THEREFORE,  in  consideration  of the mutual  agreements
contained  herein and intending to be legally bound hereby,  the parties  hereto
agree as follows:

                  SECTION 1. Purchase of Exogen Common Stock by S&N. On the date
hereof  (the  "Initial  Closing  Date"),  Exogen  will issue and sell to Smith &
Nephew Holdings,  Inc., an affiliate of S&N, and Smith & Nephew  Holdings,  Inc.
will purchase from Exogen,  820,000 shares of Common Stock, par value $.0001 per
share, of Exogen ("Exogen Common Stock"). The price to be paid for each share of
Exogen  Common Stock to be so  purchased by S&N shall be $5.00,  or an aggregate
purchase  price of  $4,100,000.  In  connection  with  such  issuance,  sale and
purchase,  on the Initial  Closing Date (i) Exogen and Smith & Nephew  Holdings,
Inc. shall execute and deliver the Common Stock  Purchase  Agreement in the form
of Exhibit A to this Agreement (the "Purchase Agreement"),  and the Registration
Rights Agreement in the form of Annex A to the Purchase  Agreement (the "Initial
Registration  Rights  Agreement"),  (ii)  Exogen  shall  deliver  or cause to be
delivered  to Smith & Nephew  Holdings,  Inc. all  certificates  (other than the
Exogen  Common Stock  certificate  (as required in the Purchase  Agreement)  and
other documents  contemplated  by the Purchase  Agreement to be delivered by it,
(iii) to the extent possible,  the Exogen Common Stock  certificate  required in
the Purchase Agreement;  and (iv) Smith & Nephew Holdings, Inc. shall deliver to
Exogen the Purchase  Price (as defined in the Purchase  Agreement) in the manner
contemplated  by the  Purchase  Agreement.  If Exogen is not able to deliver the
Exogen Common Stock  certificate on the Initial  Closing Date, then Exogen shall
deliver such certificate to Smith & Nephew Holdings, Inc. no later than five (5)
business days following the Initial Closing Date.

                  SECTION 2. United States Sales  Representative  Agreement.  On
the Initial  Closing  Date,  Exogen and S&N shall execute and deliver the United
States Sales Representative Agreement in the form of Exhibit B to this Agreement
(the "U.S. Sales Representative Agreement").
<PAGE>
                  SECTION 3.  Payment on Initial  Payment  Date.  On the Initial
Closing  Date,  S&N shall  deliver  to Exogen  $1,000,000  by wire  transfer  to
Exogen's bank account (designated at least one business day prior to the Initial
Closing Date).

                  SECTION 4. License  Agreement.  On the Initial  Closing  Date,
Exogen and S&N shall  execute  and  deliver a License  Agreement  in the form of
Exhibit C to this Agreement (the "License Agreement").

                  SECTION 5. United States Stocking Distribution Agreement.

                  (a) Exogen and S&N will  enter into a United  States  Stocking
Distribution  Agreement  having the terms and conditions set forth in Schedule 5
to this Agreement  (the "U.S.  Stocking  Distribution  Agreement") in accordance
with the following:

                      (i) If the Requisite  Approval Date (as defined in Section
         4(b) of the U.S. Sales Representative  Agreement) occurs prior to or on
         July 31, 2002,  Exogen and S&N will enter into such agreement within 30
         days following the Requisite  Approval Date,  provided that in no event
         will the U.S. Stocking Distribution Agreement become effective prior to
         August 1, 2000.

                      (ii) If S&N  desires  to enter  into such  agreement  even
         though the  Requisite  Approval  Date has not  occurred or has occurred
         after July 31, 2002 and so notifies  Exogen of such desire prior to the
         termination or expiration of the U.S. Sales  Representative  Agreement,
         Exogen and S&N will enter into such agreement  within 30 days following
         such  notification,  provided  that in no event will the U.S.  Stocking
         Distribution  Agreement  become effective prior to August 1, 2000. Each
         of Exogen and S&N shall  negotiate  in good faith the terms of the U.S.
         Stocking Distribution Agreement and shall use diligent efforts to enter
         into such agreement within the foregoing timetable.

                  (b) In  consideration  for the  execution  and delivery of the
U.S. Stocking  Distribution  Agreement,  S&N shall pay to Exogen an aggregate of
[****],  which  shall  be  payable  as  follows:  [****]  concurrently  with the
execution and delivery of the U.S. Stocking Distribution Agreement and [****] on
the first  anniversary  of such  execution and delivery.  Such payments shall be
made by wire  transfer to an account  designated by Exogen no later than two (2)
business  days  prior  to  the  execution  and  delivery  of the  U.S.  Stocking
Distribution Agreement.

- ------------

     [****]  REPRESENTS  MATERIAL WHICH HAS BEEN REDACTED  PURSUANT TO A REQUEST
FOR CONFIDENTIAL  TREATMENT PURSUANT TO RULE 24B-2 UNDER THE SECURITIES EXCHANGE
ACT OF 1934, AS AMENDED.

                                       2
<PAGE>
                  SECTION 6. Global Stocking Distribution  Agreement;  Option to
Purchase Additional Shares of Exogen Common Stock.

                      (a) S&N shall have the option  (the  "Global  Distribution
         Option"),  exercisable  by S&N by written notice given to Exogen at any
         time  during the period  commencing  on the  Initial  Closing  Date and
         ending on the  [****]  of the  Initial  Closing  Date  ("Global  Option
         Period"),  to cause Exogen to enter into with S&N or one or more of its
         Affiliates a Global Stocking  Distribution  Agreement  having the terms
         and  conditions set forth in Schedule 6A to this Agreement (the "Global
         Stocking  Distribution  Agreement").  Each  of  Exogen  and  S&N  shall
         negotiate in good faith the terms of the Global  Stocking  Distribution
         Agreement  and shall use  diligent  efforts  to enter  into the  Global
         Stocking  Distribution  Agreement as promptly as practicable  after the
         exercise of such option.

                     (i) Exogen  represents  and warrants that Schedule 9 sets
         forth  a  complete  and  accurate  list  of all  sales  representative,
         distribution  and similar  arrangements to which Exogen is a party with
         respect to  territories  outside of the United States as of the date of
         this Agreement ("Current International Arrangements"),  together with a
         description  of: the  territory  covered by each current  International
         Arrangement;  Exogen's  rights to terminate each Current  International
         Arrangement;   the  expiration  date  of  each  Current   International
         Arrangement;  and any  extension  or  renewal  rights.  S&N's  right to
         commence distribution in any country outside the United States shall be
         subject  to and  limited  by the  terms  and  conditions  disclosed  on
         Schedule  9, and any  extension,  renewal or  amendment  to any Current
         International  Arrangement as is permitted  pursuant to Section 6(e) of
         this  Agreement.  Notwithstanding  anything  contained  herein  to  the
         contrary,  Exogen shall use diligent  efforts to terminate  the Current
         International Arrangements as soon as possible following S&N's exercise
         of  its  Global  Distribution   Option.  

                      (ii) For purposes of this Agreement:

                            "Affiliate"    means   (A)   any   entity   directly
controlling,  controlled by, or under common control with another entity, or (B)
any  person or entity  owning or  controlling  more than 50% of the  outstanding
voting  securities  of an entity.  "Control"  means  possession  of the power to
direct or cause the  direction  of the  management  and  policies  of an entity,
whether through the ownership of a majority of the outstanding voting securities
or by contract or otherwise.

                            "Global  Option  Exercise  Date" means the date,  if
any, on which S&N provides the written notice referred to in Section 6(a).
- --------------

     [****]  REPRESENTS  MATERIAL WHICH HAS BEEN REDACTED  PURSUANT TO A REQUEST
FOR CONFIDENTIAL  TREATMENT PURSUANT TO RULE 24B-2 UNDER THE SECURITIES EXCHANGE
ACT OF 1934, AS AMENDED.


                                       3
<PAGE>
                  (b) Exogen  hereby  grants to S&N an option (the  "Option") to
purchase from the Company  additional  shares of Exogen Common Stock for its own
account or its designee, subject to the following terms and conditions:

                      (i) The Option shall be  exercisable by S&N beginning only
         when and if S&N  exercises  the Global  Distribution  Option within the
         time period  specified in Section 6(a), and any time  thereafter  until
         the second anniversary of the Global Option Exercise Date.

                      (ii) The Option may be exercised in whole or in part,  but
         may only be exercised  one time.  In order to exercise the Option,  S&N
         shall give to Exogen a written notice of S&N's election to exercise the
         Option (the date of such notice being referred to herein as the "Option
         Exercise Date") and S&N's designation of the date on which the purchase
         by S&N of the  shares  of Exogen  Common  Stock  shall be  closed  (the
         "Option  Closing  Date"),  which date  shall be no  earlier  than three
         business days following the Option  Exercise Date and no later than (A)
         the 45th day after the Option  Exercise Date or (B) the third  business
         day after the  expiration of any  applicable  waiting  period under the
         Hart-Scott-Rodino  Antitrust  Improvements  Act of 1976,  whichever  is
         later.  On the  Option  Closing  Date,  S&N  shall  pay to  Exogen  the
         aggregate  purchase  price  for  the  shares  of  Exogen  Common  Stock
         purchased  pursuant to exercise of the Option in immediately  available
         funds by wire  transfer to a bank  account  designated  by Exogen,  and
         Exogen shall  deliver to S&N a certificate  representing  the number of
         shares of Exogen  Common Stock so purchased by S&N,  registered  in the
         name of S&N or its nominee.

                      (iii) The maximum  number of shares of Exogen Common Stock
         which can be  purchased  upon  exercise  of the  Option is equal to the
         difference  between  (A) the  number of shares of Exogen  Common  Stock
         equal to  nineteen  percent  (19%) of the  number  of  shares of Exogen
         Common  Stock issued and  outstanding  as of the Option  Exercise  Date
         (after  giving  effect to the  shares  issuable  upon  exercise  of the
         Option),  minus  (B) the  number  of  shares  of  Exogen  Common  Stock
         purchased by S&N on the Initial  Closing Date  (adjusted to reflect any
         stock dividends, stock splits or similar events).

                      (iv) The price to be paid for each share of Exogen  Common
         Stock to be  purchased  by S&N pursuant to exercise of the Option shall
         be equal to the  average of the last  reported  sale price per share of
         Exogen Common Stock as reported on the Nasdaq  National  Market or such
         other national  securities  exchange or securities  quotation system on
         which such  shares are then traded or quoted,  using the last  reported
         sale price for each of the 20  consecutive  trading  days ending on the
         third trading day immediately preceding the Option Exercise Date.

                      (v) On the Option Closing Date or as soon thereafter as is
         practicable,  Exogen  and S&N shall  enter into a  Registration  Rights
         Agreement  having terms and 


                                       4
<PAGE>
         conditions  substantially  similar to those  contained  in the  Initial
         Registration  Rights  Agreement and covering the shares of Common Stock
         purchased upon exercise of the Option.

                  (c) If S&N exercises the Global Distribution Option, S&N shall
pay to Exogen by wire transfer an aggregate of [****], which shall be payable as
follows:  [****]  concurrently  with the  execution  and  delivery of the Global
Stocking  Distribution  Agreement  and [****] on the first  anniversary  of such
execution  and  delivery.  Exogen  shall  designate  to S&N in writing  the bank
account to which funds  should be  transferred  no later two (2)  business  days
prior to the execution and delivery of the Global Distribution Agreement.

                  (d) If,  during the period ending on the earlier of the Global
Option  Exercise Date and the  expiration of the Global  Option  Period,  Exogen
desires to commence or continue the distribution or sale of Products (as defined
in the U.S.  Sales  Representative  Agreement) in a country in which Exogen does
not then have a sales representative, distribution or other similar agreement in
effect (including by reason of the termination, expiration, renewal or extension
of a prior  agreement  in such  country) or in which  Exogen is not then selling
Products  directly,  Exogen shall so notify S&N. If S&N so elects within 10 days
following  receipt  of such  notice,  S&N shall have the  exclusive  right for a
period of 60 days after  receipt of such  notice to  negotiate  with Exogen with
respect to a stocking  distribution  agreement  in such  country with S&N (or an
Affiliate  of S&N) having the terms and  conditions  set forth in Schedule 6B to
this Agreement  (the  "Individual  Country  Stocking  Distribution  Agreement").
Exogen and S&N shall  negotiate  in good faith the terms and  conditions  of any
such  agreement,  including  the  payment  of an up  front  fee  if  Exogen  has
previously  engaged  in  distribution  activities  or  expended  funds to obtain
regulatory  approval to distribute in that country.  If the terms and conditions
of any such agreement require the payment by S&N of any fee, the fee paid by S&N
shall be credited  against any amount that may become due  pursuant to the first
sentence of Section 6(c). If Exogen and S&N do not reach  agreement on the terms
of an agreement within the 60 day period referenced above,  Exogen shall be free
to negotiate such an agreement with any other third party, provided that such an
agreement  can be  terminated by Exogen on no more than ninety (90) days' notice
(or such longer period as is required by applicable law).

                  (e) In the event that S&N elects  under  Section 6(d) to enter
into Individual Country Stocking Distribution Agreements and S&N has paid Exogen
at least [****] in up front fees (pursuant to Section 6(d)) for such agreements,
then S&N shall have the right at any time following the last payment to exercise
the Global Stocking  Distribution Option without payment of the amounts required
under  Section 6(c),  and the  provisions of Section 6(c) shall be of no further
force or effect.

- -------------
     [****]  REPRESENTS  MATERIAL WHICH HAS BEEN REDACTED  PURSUANT TO A REQUEST
FOR CONFIDENTIAL  TREATMENT PURSUANT TO RULE 24B-2 UNDER THE SECURITIES EXCHANGE
ACT OF 1934, AS AMENDED.

                                       5
<PAGE>
                  SECTION 7. Certain Rights of First Negotiation.

                  (a) If, at any time prior to August 1, 2008, Exogen desires to
enter into an agreement of any kind (including, without limitation, an agreement
for sale, development,  manufacture, license or distribution) with a third party
with respect to, or in connection  with,  any  ultrasound  or mechanical  stress
therapy  (and  any  intellectual  property  rights  relating  thereto)  for  the
treatments  and   indications   set  forth  in  Section  1  of  the  U.S.  Sales
Representative  Agreement,  the U.S.  Stocking  Distribution  Agreement,  Global
Stocking  Distribution  Agreement or Individual  Country  Stocking  Distribution
Agreement  or  any  new  indication,   including,  without  limitation,   spine,
cartilage, wounds, osteoporosis or other muscular-skeletal tissues, Exogen shall
give S&N notice  thereof.  If S&N so elects within 10 days following  receipt of
such notice, S&N shall have the right, on a non-exclusive basis, for a period of
45 days after receipt of such notice to negotiate  with Exogen with respect to a
letter of intent for any such agreement. During such 45 day period, Exogen shall
not execute a letter of intent or definitive  agreement with any other person or
entity.  If a letter of intent is  executed  with S&N within such 45 day period,
such letter of intent shall be subject to and  conditioned  upon approval by the
board  of  directors  of  Smith &  Nephew  plc no  later  than 45 days  from the
execution  of the letter of intent ( the period  from  execution  of a letter of
intent  until  approved  by such board of  directors  to be  referred  to as the
"Approval  Period").  During  the  Approval  Period  and for a period of 90 days
thereafter,  if  approved by the Smith & Nephew plc board of  directors,  Exogen
shall not initiate,  encourage or participate in any discussions with respect to
such  agreement or arrangement  with any other person or entity.  Exogen and S&N
shall  negotiate  in good faith the terms and  conditions  of any such letter of
intent and  agreement.  The  parties  acknowledge  that the letter of intent and
agreement may include the terms and  conditions  set forth in Schedule 7 to this
Agreement.

                  (b) If, at any time  during  the  effectiveness  of any of the
U.S. Sales Representative Agreement, the U.S. Stocking Distribution Agreement or
the Global Stocking Distribution Agreement,  Exogen desires to sell, transfer or
otherwise  dispose of  substantially  all of the assets of Exogen or to effect a
merger, consolidation,  recapitalization, issuance of shares of capital stock or
other  transaction,  as a result of which the stockholders of Exogen immediately
prior to such  transaction own less than a majority of the voting  securities of
the  surviving  entity  after such  transactions,  Exogen  shall give S&N notice
thereof.  If S&N so elects within 10 days following receipt of such notice,  S&N
shall have the right,  on a non-exclusive  basis,  for a period of 45 days after
receipt of such notice to  negotiate  with  Exogen  with  respect to a letter of
intent for any such  transaction.  During such 45 day period,  Exogen  shall not
execute  a letter of intent or  definitive  agreement  with any other  person or
entity.  If a letter of intent is  executed  with S&N within such 45 day period,
such letter of intent shall be subject to and  conditioned  upon approval by the
board of directors of Smith & Nephew plc during the Approval Period.  During the
Approval Period and for a period of 90 days thereafter, if approved by the Smith
& Nephew  plc board of  directors,  Exogen  shall  not  initiate,  encourage  or
participate in any discussions  with any other person or entity relating to such
transaction.  Exogen and S&N shall  negotiate  in good faith with respect to any
such letter of intent and transaction.  


                                       6
<PAGE>
                  (c) Nothing  set forth in Section  7(a) or (b) shall be deemed
to require  Exogen or S&N to enter into an  agreement  with the other party with
respect to the types of transactions or agreements covered by these Sections.


                  SECTION 8. Certain Covenants of Exogen.

                  (a) Exogen  shall use diligent  efforts to obtain,  as soon as
reasonably  practicable,  national reimbursement approval for the SAFHS 2000 and
3000 devices in each of France, Germany and Holland;  provided,  that failure to
obtain such  approvals  shall not  constitute a default under this  Agreement if
Exogen has otherwise complied with this Section 8(a).

                  (b) Exogen warrants and represents to S&N that,  except as set
forth on  Schedule  8, it is the sole and  exclusive  owner of the  patents  and
patent  applications  set forth in  Schedule 8 and the  inventions  therein  set
forth,  the trademarks and trademark  applications  set forth in Schedule 8, and
the  copyright in all software,  directions  for use,  labeling and  promotional
materials  heretofore  used in  association  with SAFHS  devices  (collectively,
"Intellectual  Property").  Exogen  will pay all  maintenance  fees  for  issued
patents prior to applicable due dates and renew all registered  trademarks prior
to applicable  renewal dates and  prosecute all patent  applications;  provided,
however,  that if Exogen elects not to maintain any patent,  renew any trademark
or  prosecute  any  patent  application  in  any  territory  in  which  S&N  has
distribution  or sales  representative  rights,  it shall give  notice to S&N at
least 60 days prior to the due date for such maintenance fee or renewal, and S&N
may pay such amounts and take such actions as are required for such maintenance,
renewal or prosecute  any patent  application  in any territory in which S&N has
distribution  or sales  representative  rights and  Exogen  shall  execute  such
agreements,  assignments or other  documents as may be required in order to make
S&N a co-assignee  or co-owner of any patent or trademark for which S&N has paid
a fee for so long as S&N continues to pay such fees.  Exogen shall not,  without
the prior written  approval of S&N,  which  approval  shall not be  unreasonably
withheld, sell, transfer,  convey, pledge or otherwise encumber the Intellectual
Property  or any  Intellectual  Property  developed  in the future  relating  to
Products in any territory in which S&N has distribution or sales  representative
rights; provided, however, that Exogen shall not be precluded from engaging in a
transaction  covered  by  Section  7 in  accordance  with such  Section  or from
granting a security  interest in  substantially  all of its assets in connection
with  obtaining a loan or line of credit or similar  financing  from one or more
financial  institutions,  provided  Exogen  delivers  an  effective  and legally
binding  agreement  from the secured  party  wherein the secured party agrees to
subordinate  its  claims  and  interests  to that  of S&N  and  not to  disturb,
terminate  or modify  any rights S&N may have with  respect to any  security  or
collateral  if the  secured  party  exercises  its rights  with  respect to such
security or collateral.

                  (c)  (i)  Exogen  shall   indemnify  S&N  and  its  employees,
         Affiliates, sales representatives and distributors from and against any
         claim or suit for patent,  trademark or copyright  infringement arising
         out of or connected  with the sale and  marketing  of Products.  Exogen
         warrants  and  represents  to S&N that it has  received  no  notice  of
         patent,  trademark or copyright  infringement from any third party with
         respect to 

                                       7
<PAGE>

         Products.  Exogen shall promptly notify S&N of any future suits, claims
         or demands relating to the Intellectual Property.

                      (ii) Each party shall  promptly  notify the other party of
         any lawsuit, demand, claim or other action or threat thereof in respect
         of which  indemnification  may be sought under Section 8(c)(i).  Exogen
         shall have sole  control  over the defense and  settlement  of any such
         action and S&N shall  reasonably  cooperate with Exogen in such defense
         at Exogen's expense.

                  (d) If  either  party  has  evidence  that a  third  party  is
         infringing the Intellectual Property, it will promptly notify the other
         party.

                      (i)  Exogen  shall  have the first  right to  enforce  any
         Intellectual  Property  rights  against  any  infringement  or  alleged
         infringement  thereof, and shall notify S&N, within three (3) months of
         receipt  of the  notice  referred  to  above,  whether  it  intends  to
         institute  suit  against any such  infringer or alleged  infringer.  If
         Exogen so elects, it shall have the right to control, settle and defend
         such suit in a manner  consistent with the terms and provisions of this
         Section  8(d) and shall at all times keep S&N informed as to the status
         thereof.  S&N may elect to share equally in the Expenses (as defined in
         Section  8(e)) of any such  suit,  by notice  to Exogen  within 30 days
         following receipt of Exogen's notice of intent to institute suit.

                      (ii) If Exogen  elects  not to  enforce  any  Intellectual
         Property  rights  relating  to  an  alleged  infringement  claim  in  a
         territory in which S&N has distribution or sales representative rights,
         S&N  may,  in its  sole  judgment,  institute  suit  against  any  such
         infringer or alleged infringer and control, settle and defend such suit
         in a manner  consistent  with the terms and  provisions of this Section
         8(d). In such event,  S&N shall at all times keep Exogen informed as to
         the status  thereof.  Exogen may elect to share equally in the Expenses
         of any such suit, by notice to S&N within 30 days following  receipt of
         S&N's  notice  of  intent  to  institute  suit.   Notwithstanding   the
         foregoing,  no settlement,  consent judgment or other voluntarily final
         disposition of any such suit may be entered into without the consent of
         Exogen, which consent will not be unreasonable withheld.

                      (iii) In any suit covered by this Section 8(d),  the party
         not  controlling  the  litigation  (the   "Participant   Party")  shall
         reasonably cooperate in such litigation.  Each party agrees that, if it
         is the Participant  Party, it may be named (if  appropriate) as a party
         in any suit  brought  by the  other  party  under  this  Section  8(d);
         provided that S&N shall not be made a party to a suit with respect to a
         territory   in  which  it  does   not   have   distribution   or  sales
         representative  rights.  Each party agrees to make  available  relevant
         records, papers, information, samples and specimens, as well as to have
         its employees testify upon request.

                                       8
<PAGE>
                      (iv) Any recovery of damages or costs in any  infringement
         suit under this Section 8(d), where such damages and costs relate to an
         infringement  claim in a  territory  in which S&N has  distribution  or
         sales representative rights, shall be applied as follows:

                           (A) first, either (I) equally to each party until all
Expenses of the suit have been reimbursed (or repaid in such other proportion as
actually paid by the  parties),  if the parties had agreed to share the Expenses
equally or (II) to the party solely  undertaking the Expenses of such suit until
all such Expenses have been reimbursed;

                           (B) if the  Participant  Party shared  equally in the
Expenses,  the  balance of any  recovery  shall be shared  equally  between  the
parties;

                           (C) if Exogen  controlled  the litigation and S&N did
not share equally in the Expenses,  the balance of any recovery shall be divided
75% to Exogen and 25% to S&N; and

                           (D) if S&N  controlled  the litigation and Exogen did
not share equally in the Expenses,  the balance of any recovery shall be divided
75% to S&N and 25% to Exogen.

                  Any damages or costs  recovered in a suit,  where such damages
and costs relate to an  infringement  claim in a territory in which S&N does not
have distribution or sales  representative  rights shall be for the sole benefit
of Exogen.

                  (e) Subject to Section 12.2,  Exogen shall  indemnify and hold
harmless  S&N and its  Affiliates  from all Losses and  Expenses  (as defined in
Section  12.2)  incurred  by S&N and its  Affiliates:  (i) as  required  by this
Agreement or any agreement  contemplated  hereby;  or (ii) in connection with or
arising  out of:  (A) any  breach  by  Exogen  of any of its  covenants  in this
Agreement or any  Agreement  contemplated  herein;  (B) any failure of Exogen to
perform any of its  obligations in this Agreement or any agreement  contemplated
herein;  (C) any breach of any warranty or the inaccuracy of any  representation
or warranty  of any Exogen or its  Affiliates  contained  or referred to in this
Agreement or any agreement  contemplated  hereby;  (D) the violation of any law,
rule or  regulation  by Exogen or its  Affiliates;  or (E) any personal  injury,
death or property damage arising out of or in connection  with the  manufacture,
use or sale of Products.  Provided, however, Exogen shall not be so obligated to
indemnify  S&N or its  Affiliates  to the extent  that  Losses were caused by or
resulted from the negligent act or omission or willful misconduct  following the
date  of this  Agreement  of S&N or its  Affiliates,  sales  representatives  or
distributors.

                  (f) During the term of the agreements to be executed  pursuant
to this  Agreement and for one year  following the  termination or expiration of
the last of such agreements, Exogen shall not solicit any employee of S&N or its
Affiliates. Notwithstanding the foregoing, Exogen shall not be in breach of this
covenant  if  Exogen  (i)  makes   solicitation 

                                       9
<PAGE>
for employment by general  advertisement  in periodicals of broad  distribution;
(ii)  hires  any  such  person  if at the  time  such  person  responds  to such
solicitation,  such person has terminated his or her employment  with S&N or its
Affiliate,  voluntarily or involuntarily, and Exogen has not otherwise solicited
such person;  or (iii) S&N is in default  under any of the  agreements  executed
pursuant  to this  Agreement  and such  person  provides  a  service  reasonably
necessary for Exogen to satisfy the obligations of S&N or Exogen thereunder.


                  SECTION 9. Certain Covenants of S&N.

                  (a) Until the earlier of August 1, 2008 or termination of this
Master  Agreement  and  all  agreements   contemplated  hereby,  and  except  as
specifically  provided for in this Master  Agreement,  without the prior written
approval of  Exogen's  board of  directors,  S&N will not (i) acquire any Exogen
Common Stock (or securities  exchangeable,  convertible or exercisable therefor)
other than as contemplated  herein and other than securities issued as dividends
on shares of Exogen  Common Stock  purchased by S&N pursuant to this  Agreement,
(ii) commence a tender offer for more than 20% of the then outstanding shares of
Exogen Common  Stock;  or (iii) make any public  announcement  relating to (i)or
(ii) above;  provided,  that the foregoing  shall not be applicable in the event
that any person or persons acting in concert not affiliated with S&N (as defined
in the  regulations  under the Securities  Exchange Act of 1934) (A) acquires or
makes a tender offer for outstanding  Common Stock of Exogen equal to or greater
than 20% of the  outstanding  shares of Exogen  Common  Stock  (other than in an
underwritten  public offering) or (B) indicates publicly its intention to effect
such a transaction.

                  (b)  Subject to Section  12.2,  S&N shall  indemnify  and hold
harmless Exogen and its Affiliates from all Losses and Expenses incurred by such
S&N and its  Affiliates  (i) as  required  by this  Agreement  or any  agreement
contemplated  hereby;  or (ii) in  connection  with or  arising  out of: (A) any
breach by S&N or its  Affiliates  of any of their  respective  covenants in this
Agreement or any Agreement  contemplated  herein;  (B) any failure of any S&N or
its Affiliates to perform any of their respective  obligations in this Agreement
or any  agreement  contemplated  herein;  (C) any breach of any  warranty or the
inaccuracy  of any  representation  or  warranty  of any  S&N or its  Affiliates
contained or referred to in this Agreement or any agreement contemplated hereby;
(D) the violation of any law, rule or  regulation by S&N or its  Affiliates;  or
(E)  any  personal  injury,  death  or  property  damage  arising  out  of or in
connection  with  repairs or  alterations  made to Products  without the written
approval of Exogen, which approval shall not be unreasonably withheld. Provided,
however,  S&N shall not be so obligated to indemnify Exogen or its Affiliates to
the  extent  that  Losses  caused  by or  resulting  from the  negligent  act or
omissions of Exogen or its Affiliates.

                  (c)  S&N  shall   comply  and  shall   cause  its   employees,
Affiliates,  sales  representatives and distributors to comply with all U.S. and
foreign labeling and other regulatory  requirements and restrictions  applicable
to the  marketing  and sale of Products  in the United  States and in such other
countries in which S&N has  exercised  its option to  distribute  Products.  All
Products shall be marked with Exogen's  trademarks and all product  labeling and
packaging that is not Exogen's  standard labeling and packaging 

                                       10
<PAGE>
shall be subject to Exogen's consent, which shall not be unreasonably withheld.

                  (d) During the term of the agreements to be executed  pursuant
to this  Agreement and for one year  following the  termination or expiration of
the last of such agreements, S&N shall not solicit any employee of Exogen or its
Affiliates.  Notwithstanding  the foregoing,  S&N shall not be in breach of this
covenant if S&N (i) makes  solicitation for employment by general  advertisement
in  periodicals of broad  distribution;  or (ii) hires any such person if at the
time such person responds to such  solicitation,  such person has terminated his
or her employment  with Exogen or its Affiliate,  voluntarily or  involuntarily,
and S&N has not otherwise  solicited such person;  or (iii) Exogen is in default
under any of the agreements  executed pursuant to this Agreement and such person
provides a service  reasonably  necessary for S&N to satisfy the  obligations of
S&N or Exogen thereunder.

                  (e)  Except as set forth  below,  S&N shall not enter  into or
assume any distribution or sales representative  agreement with any other person
or entity  pursuant to which S&N distributes or sells  "Competing  Products" (as
defined  below) in the United States or in any other country as to which S&N has
distribution or sales  representative  rights.  "Competing  Products" shall mean
non-invasive low intensity  ultrasonic or electrical  products for the treatment
of bone  fractures,  osteotomies,  arthrodeses  (other than spine  fusions)  and
distractive  osteogenesis.  Notwithstanding  anything  contained  herein  to the
contrary, S&N shall be permitted to acquire, through merger,  consolidation,  or
asset  acquisition  an entity,  assets or business  which  distributes  or sells
Competing  Products in the United  States or such other  country or countries if
such  acquisition is part of an acquisition  which includes  products other than
the Competitive Products ("Competitive  Acquisition").  S&N shall provide Exogen
with written  notice of any  Competitive  Acquisition  no later than the date on
which such Competitive  Acquisition is consummated and the parties shall discuss
the impact of the  Competitive  Acquisition on this  Agreement,  if any, and any
amendment  that  could be made to this  Agreement  in order to  accommodate  the
Competitive Acquisition. No later than 30 days following receipt of such notice,
Exogen  shall  elect by  written  notice  to S&N to  either  (i)  continue  this
Agreement  without  amendment;  (ii) continue this  Agreement  with amendment in
accordance  with the  discussions  referred to above;  or (iii)  terminate  this
Agreement,  in any of which cases,  subject to any amendment  under clause (ii),
S&N shall be permitted  to sell and  distribute  the  Competitive  Products.  If
Exogen elects the option set forth in clause (ii) above,  then the parties shall
negotiate in good faith for a period of 30 days with respect to such  amendment.
If Exogen  elects the option set forth in clause (iii)  above,  then Exogen will
pay S&N [****] if Exogen makes such

- -------------
     [****]  REPRESENTS  MATERIAL WHICH HAS BEEN REDACTED  PURSUANT TO A REQUEST
FOR CONFIDENTIAL  TREATMENT PURSUANT TO RULE 24B-2 UNDER THE SECURITIES EXCHANGE
ACT OF 1934, AS AMENDED.

                                       11
<PAGE>
election  prior to the first  anniversary  of this  Agreement;  [****] if Exogen
makes such election prior to the second anniversary of this Agreement; [****] if
Exogen makes such election  prior to the third  anniversary  of this  Agreement;
[****] if Exogen makes such  election  prior to the fourth  anniversary  of this
Agreement;  or [****] if Exogen  makes such  election  anytime  after the fourth
anniversary of this  Agreement.  Upon receipt of payment S&N shall, if requested
by Exogen,  assign to Exogen all  agreements  relating to the Products  with its
distributors.  In  addition,  S&N will allow Exogen to offer  employment  to all
Transferred  Employees (as defined in the U.S. Sales  Representative  Agreement)
who remain  employed by S&N and shall  cooperate  with Exogen in the transfer of
any such individuals who accept  re-employment with Exogen.  Provided,  however,
S&N shall not be liable or responsible  if Transferred  Employees do not wish to
be re-employed  by Exogen or elect to remain  employees of S&N. If Exogen elects
the option set forth in clause  (ii) above and the  parties  are unable to agree
upon an amendment to this Agreement  within the 30 day period,  Exogen may elect
between  the  options  set forth in clauses  (i) and (iii).  If Exogen  fails to
provide  notice of its  election of the options set forth in this  Section or in
the preceding  sentence,  then Exogen shall be deemed to have elected the option
contained in clause (i).  Nothing  contained  herein shall limit or prohibit S&N
from  acquiring  or owning  directly or  indirectly  not in excess of 10% of the
equity of an entity that is engaged in the manufacture,  sale or distribution of
a Competitive Product.

                  SECTION 10. Representations and Warranties of Exogen.

                  In addition to the  representations and warranties made on the
Initial  Closing Date by Exogen in the  Purchase  Agreement  and the U.S.  Sales
Representative Agreement, Exogen represents and warrants to S&N as follows:

                  10.1 Power and Authority.  Exogen has all requisite  power and
authority  to enter  into and carry out the  transactions  contemplated  by this
Agreement.  All corporate action on the part of Exogen, its officers,  directors
and shareholders necessary for the authorization, execution and delivery of this
Agreement and the  performance of all  obligations of Exogen  hereunder has been
taken, and this Agreement  constitutes the valid and legally binding  obligation
of Exogen,  enforceable  against Exogen in accordance with its terms, except (i)
as limited by applicable bankruptcy, insolvency, reorganization, moratorium, and
other laws of general  application  affecting  enforcement of creditors'  rights
generally,  (ii) as limited by laws  relating  to the  availability  of specific
performance,  injunctive relief, or other equitable  remedies,  and (iii) to the
extent the  indemnification  provisions  contained  in the  Registration  Rights
Agreement may be limited by applicable federal or state securities laws.

                  10.2 Valid Issuance of Exogen Common Stock.  The Exogen Common
Stock being  purchased by S&N pursuant to Section 1 or which may be purchased by
S&N upon 

- -------------
     [****]  REPRESENTS  MATERIAL WHICH HAS BEEN REDACTED  PURSUANT TO A REQUEST
FOR CONFIDENTIAL  TREATMENT PURSUANT TO RULE 24B-2 UNDER THE SECURITIES EXCHANGE
ACT OF 1934, AS AMENDED.


                                       12
<PAGE>
exercise of the Option,  when issued,  sold and delivered in accordance with the
terms hereof for the consideration  expressed  herein,  will be duly and validly
issued and outstanding,  fully paid and nonassessable with no personal liability
attaching  to the  ownership  thereof,  free and clear of any  Encumbrances  (as
defined in the Purchase Agreement), other than Encumbrances,  if any, arising as
a result of  actions  taken by S&N,  and not  subject to  preemptive  or similar
rights of stockholders of Exogen or others.

                  10.3  Consents.  Except as  disclosed on Schedule 9 hereto and
for any notifications or filings as may be required under applicable  federal or
state  securities  laws,  if any,  which  shall  be made on a timely  basis,  no
consent,  approval,  order or authorization of, or registration,  qualification,
designation, declaration or filing with, any person (governmental or private) on
the part of Exogen or its Subsidiary  (as defined in the Purchase  Agreement) is
required in connection with the consummation of the transactions contemplated by
this Agreement.

                  10.4  Compliance  with  Other   Instruments.   The  execution,
delivery and performance of this Agreement by Exogen and the consummation of the
transactions  contemplated  hereby will not (x) result in any violation of or be
in conflict with or  constitute,  with or without the passage of time and giving
of notice,  either a default  under any  provisions  of its Second  Amended  and
Restated  Certificate  of  Incorporation  or Amended and  Restated  Bylaws,  any
provisions of any instrument, judgment, order, writ, decree or contract to which
it is a party or by which it is bound,  or to the best  knowledge of Exogen,  of
any  provision of domestic  (federal,  state or local) or foreign law,  statute,
rule or regulation applicable to Exogen or the Subsidiary,  or (y) result in the
creation  of any lien,  charge or  Encumbrance  upon any assets of Exogen or its
Subsidiary or the suspension,  revocation, impairment, forfeiture, or nonrenewal
of any material permit, license, authorization, or approval applicable to Exogen
or its  Subsidiary,  their  business  or  operations  or any of their  assets or
properties.

                  10.5 ISO 9000 and CE Mark of  Approval.  Exogen  warrants  and
represents  to S&N  that the  SAFHS  2000  device  complies  with  International
Standards  Organization  ("ISO")  Certification  9003  and  the  Medical  Device
Directive and received the CE Mark of Approval on March 24, 1998,  and that such
certification  and  approval  will be  maintained  in full  force and  effect at
Exogen's  expense.  Exogen shall use its diligent efforts to obtain and maintain
ISO 9000  certification and the CE Mark of Approval for the SAFHS 3000 device at
Exogen's expense.

                  10.6 Millenium Compliance. Exogen represents and warrants that
the Products will process dates correctly  before, on and after January 1, 2000,
such that the features and performance of the Products will be unaffected by the
transition  from the twentieth  century to the twenty first  century;  provided,
however, that the Products are used in accordance with 

                                       13
<PAGE>
written instructions.

                  SECTION 11. Representations and Warranties of S&N.

                  In addition to the  representations and warranties made on the
Initial  Closing  Date  by S&N in the  Purchase  Agreement  and the  U.S.  Sales
Representative Agreement, S&N represents and warrants to Exogen as follows:

                  11.1  Power and  Authority.  S&N has all  requisite  power and
authority  to enter  into and carry out the  transactions  contemplated  by this
Agreement. All corporate action on the part of S&N, its officers,  directors and
shareholder  necessary  for the  authorization,  execution  and delivery of this
Agreement  and the  performance  of all  obligations  of S&N  hereunder has been
taken, and this Agreement  constitutes the valid and legally binding  obligation
of S&N,  enforceable  against S&N in  accordance  with its terms,  except (i) as
limited by applicable bankruptcy,  insolvency,  reorganization,  moratorium, and
other laws of general  application  affecting  enforcement of creditors'  rights
generally,  (ii) as limited by laws  relating  to the  availability  of specific
performance,  injunctive relief, or other equitable  remedies,  and (iii) to the
extent the  indemnification  provisions  contained  in the  Registration  Rights
Agreement may be limited by applicable federal or state securities laws.

                  11.2  Consents.  Except as  disclosed on Schedule 9 hereto and
for any notifications or filings as may be required under applicable  federal or
state  securities  laws,  if any,  which  shall  be made on a timely  basis,  no
consent,  approval,  order or authorization of, or registration,  qualification,
designation, declaration or filing with, any person (governmental or private) on
the  part  of S&N  is  required  in  connection  with  the  consummation  of the
transactions contemplated by this Agreement.

                  11.3  Compliance  with  Other   Instruments.   The  execution,
delivery and  performance of this Agreement by S&N and the  consummation  of the
transactions  contemplated  hereby will not result in any  violation of or be in
conflict with or  constitute,  with or without the passage of time and giving of
notice,   either  a  default  under  any   provisions  of  its   Certificate  of
Incorporation  or Bylaws,  any provisions of any  instrument,  judgment,  order,
writ,  decree or contract to which it is a party or by which it is bound,  or to
the best  knowledge  of S&N, of any  provision  of domestic  (federal,  state or
local) or foreign law, statute, rule or regulation applicable to S&N.

                  SECTION 12. Miscellaneous.

                  12.1 Survival of Warranties.  The warranties,  representations
and covenants of Exogen and S&N contained in or made pursuant to this  Agreement
shall survive the  execution and delivery of this  Agreement and shall in no way
be affected by any  investigation  of the subject  matter  thereof made by or on
behalf of S&N or Exogen.

                  12.2  Deductible.  "Losses"  means any and all losses,  costs,
obligations,   liabilities,   settlement  payments,  awards,  judgments,  fines,
penalties,  damages, expenses,  deficiencies and other charges. "Expenses" means
any and all reasonable expenses incurred in

                                       14
<PAGE>
connection with investigating,  defending,  or asserting any claim, action, suit
or proceeding incident to any matter indemnified  against hereunder  (including,
without limitation,  court filing fees, court costs,  arbitration fees or costs,
witness fees, and reasonable fees and disbursements of legal counsel. No payment
under Section 8(e) or 9(b) with respect to any Losses as a result of a breach of
a  representation  or  warranty  under  this  Agreement  or any other  agreement
contemplated  hereby shall be payable until the time such Losses  incurred by an
indemnitee shall aggregate more than $30,000 (the  "Deductible"),  and then only
to the extent that such Losses, in the aggregate for the indemnitee,  exceed the
Deductible.  For purposes of the preceding sentence, each of the representations
and  warranties  made by this Agreement and the agreement  executed  pursuant to
this  Agreement  shall be  deemed to have been made  without  the  inclusion  of
limitations or  qualifications  as to  materiality,  such as the words "Material
Adverse  Effect,"  "immaterial,"  "material"  and "in all material  respects" or
words of similar import.

                  12.3  Claim  Notice.  A party  seeking  indemnification  under
Sections  8(e)  and 9(b)  shall,  promptly  upon  becoming  aware  of the  facts
indicating that a claim for indemnification may be warranted,  give to the party
from whom  indemnification  is being sought a claim notice relating to such Loss
(a "Claim Notice"). Each Claim Notice shall specify the nature of the claim, the
applicable  provisions  of this  Agreement or other  instrument  under which the
claim for indemnity arises, and, if possible, the amount or the estimated amount
thereof.  No failure  or delay in giving a Claim  Notice (so long as the same is
given prior to expiration of the representation or warranty upon which the claim
is based) and no failure to include  any  specific  information  relating to the
claim (such as the amount or estimated  amount  thereof) or any reference to any
provision  of this  Agreement or other  instrument  under which the claim arises
shall affect the obligation of the party from whom indemnify is sought.

                  12.4 Remedies. In case any one or more of the covenants and/or
agreements  set forth in this  Agreement or any agreement  contemplated  by this
Agreement  shall have been breached by any party hereto,  S&N, with respect to a
breach by Exogen,  and Exogen,  with  respect to a breach by S&N, may proceed to
protect and enforce its rights either by suit in equity and/or by action at law,
including,  but not  limited  to, an action for  damages as a result of any such
breach and/or, where appropriate, an action for specific performance of any such
covenant or agreement contained in such agreement.

                  12.5  Successors  and Assigns.  Except as  otherwise  provided
herein, the terms and conditions of this Agreement shall inure to the benefit of
and be binding upon the  respective  successors,  permitted  assigns,  heirs and
personal  representatives  of the parties,  except that neither party may assign
its rights and obligations  under this Agreement to any person without the prior
written  consent  of the other  party or in  accordance  with  Section 7 of this
Agreement.  Nothing in this Agreement, express or implied, is intended to confer
upon any party other than the parties hereto or their respective  successors and
assigns any rights, remedies,  obligations, or liabilities under or by reason of
this Agreement, except as expressly provided in this Agreement.

                                       15
<PAGE>
                  12.6  Governing  Law.  This  Agreement  shall be governed  and
construed  under  the  laws of the  State  of  Delaware  without  regard  to the
principles of conflicts or choice of law.

                  12.7  Counterparts.  This  Agreement may be executed in two or
more counterparts,  each of which shall be deemed an original,  but all of which
together shall constitute one and the same instrument.

                  12.8 Titles and  Subtitles.  The titles and subtitles  used in
this  Agreement  are used for  convenience  only and are not to be considered in
construing or interpreting this Agreement.

                  12.9 Notices.  Unless otherwise provided,  any notice required
or permitted  under this Agreement shall be given in writing and shall be deemed
effectively   given  upon  personal   delivery  or   confirmation  of  facsimile
transmission  (with a copy to be sent in  accordance  with this  Section) to the
party to be notified or upon  deposit  with the United  States Post  Office,  by
registered or certified  mail,  postage prepaid and addressed to the party to be
notified at the address indicated for such party on the signature page hereof or
at such  other  address as such party may  designate  by ten (10) days'  advance
written  notice to the other party.  In the case of notices to be sent to S&N, a
copy shall  also be  delivered  to:  Smith & Nephew,  Inc.,  1450  Brooks  Road,
Memphis,   Tennessee  38116,   Attention   General  Counsel,   Facsimile  Number
901-396-7824.  In the case of notices to be sent to Exogen, a copy shall also be
delivered to Brobeck,  Phleger & Harrison,  LLP, 1633 Broadway,  47th Floor, New
York, New York 10019, Attention Ellen B. Corenswet, Esquire.

                  12.10  Attorneys'  Fees.  If any action at law or in equity is
necessary to enforce or interpret the terms of this  Agreement,  the  prevailing
party shall be entitled  to  reasonable  attorneys'  fees,  costs and  necessary
disbursements  in  addition  to any  other  relief  to which  such  party may be
entitled.

                  12.11 Amendments and Waivers. No term of this Agreement may be
amended,  discharged  or  terminated  and  the  observance  of any  term of this
Agreement may not be waived  (either  generally or in a particular  instance and
either retroactively or prospectively), without the prior written consent of the
parties. No waiver of any of the provisions of this Agreement shall be deemed to
or shall  constitute  a waiver of any other  provision  hereof  (whether  or not
similar).  No delay on the part of any party in exercising  any right,  power or
privilege hereunder shall operate as a waiver thereof.

                  12.12  Severability.   If  one  or  more  provisions  of  this
Agreement are held to be  unenforceable  under  applicable  law, such  provision
shall be excluded from this Agreement and the balance of the Agreement  shall be
interpreted  as if such  provision  were so excluded and shall be enforceable in
accordance with its terms.

                  12.13  Entire  Agreement.  This  Agreement  and the  documents
referred to herein  constitute the entire  agreement  between the parties and no
party  shall be  liable  or  bound  to the

                                       16
<PAGE>
other  party in any  manner by any  warranties,  representations,  or  covenants
except as specifically set forth herein or therein.

                  12.14 Press  Releases and  Announcements.  Each of the parties
hereto agrees that it will not issue any press release or announcement  relating
to the subject  matter of this Agreement  without the prior written  approval of
the  other  parties;  provided,  however,  that any  party  may make any  public
disclosure it believes in good faith is required by law, stock exchange rules or
regulation  (in which case the  disclosing  party shall  advise the other party,
provide  it  with  a  copy  of the  proposed  disclosure  prior  to  making  the
disclosure,  and use  reasonable  efforts  to agree  upon the text of such press
release, before issuing any such press release).

                  12.15  Arbitration.  Any dispute concerning this Agreement and
any  agreement  contemplated  hereunder  (except the U.S.  Sales  Representative
Agreement) shall be submitted to a panel of three arbitrators.  Each party shall
appoint one arbitrator and the two arbitrators shall appoint a third arbitrator.
The  arbitration  proceedings  shall be  conducted in  accordance  with the then
current  Rules  for  Large,   Complex  Disputes  of  the  American   Arbitration
Association,  or in  accordance  with  such  other  rules or  procedures  as the
Arbitrator  may  specify.  The  arbitration  shall  take  place  in  Wilmington,
Delaware. Each party will bear its own arbitration expenses plus one-half of the
arbitrators' fee. This arbitration shall be non-binding.


                                       17
<PAGE>



                  IN WITNESS  WHEREOF,  the parties have executed this Agreement
as of the date first above written.



                                    EXOGEN, INC.



                                    By: /s/ Patrick A. McBrayer
                                    ---------------------------
                                    Name:  Patrick A. McBrayer
                                    Title: President and Chief Executive Officer
                                    Address:    10 Constitution Ave.
                                                P.O. Box 6860
                                                Piscataway, NJ 08855
                                    Facsimile Number: 732-981-0648


                                    SMITH & NEPHEW, INC.



                                    By: /s/ Larry W. Papasan
                                    ------------------------
                                    Name:       Larry W. Papasan
                                    Title:      President
                                                Orthopaedic Division
                                    Address:    1450 Brooks Road
                                                Memphis, TN 38116
                                    Facsimile Number: 901-399-7824


                      [SIGNATURE PAGE TO MASTER AGREEMENT]


                                       18
<PAGE>
                                   SCHEDULE 5


                             TERMS AND CONDITIONS OF
                      U.S. STOCKING DISTRIBUTION AGREEMENT



General:                      S&N to have exclusive  rights in the United States
                              for the sale,  promotion and marketing of Products
                              (as  defined  in  the  U.S.  Sales  Representative
                              Agreement).

Term of Agreement:            From  execution and delivery  until July 30, 2008,
                              unless terminated  earlier pursuant to termination
                              rights.  S&N to  have  the  option  to  renew  for
                              consecutive    three-year    terms   on   mutually
                              acceptable  terms  and  conditions.  If terms  and
                              conditions  of first  renewal  term not agreed to,
                              then the  agreement  shall be renewed for one five
                              year  period  on a  non-exclusive  basis  with  no
                              Minimum Number of Orders  requirements (as defined
                              in the U.S. Sales Representative Agreement).

Termination rights:           Material default  by other  party not cured within
                              60 days after notice.

Exogen's responsibilities:    Manufacturing,  shipment  FOB New  Jersey  to S&N,
                              product training to S&N's sales personnel, product
                              warranty work at Exogen's expense, provision of up
                              to 100  demonstration  units  annually at standard
                              manufacturing  cost plus 25%,  maintenance of U.S.
                              regulatory    approvals,    CE    mark,    quality
                              registrations  and  U.S.   intellectual   property
                              rights in good standing.

S&N's                         Sales, marketing,  promotion and distribution. S&N
responsibilities:             to be  responsible  for  [****].  S&N  to  provide
                              reasonable  follow-up  contact with physicians and
                              patients.  Minimum Number of Units requirements to
                              be  negotiated  in  good  faith.  S&N to  pay  for
                              Products within 30 days of shipment.

- -------------
     [****]  REPRESENTS  MATERIAL WHICH HAS BEEN REDACTED  PURSUANT TO A REQUEST
FOR CONFIDENTIAL  TREATMENT PURSUANT TO RULE 24B-2 UNDER THE SECURITIES EXCHANGE
ACT OF 1934, AS AMENDED.
                      
                                      i
<PAGE>
Transfer prices:              Transfer  prices  to be  established  for  first 4
                              years as set forth on the following chart based on
                              average  selling  price of  [****]  provided  that
                              transfer  prices to be  renegotiated  during  such
                              4-year period in good faith if the average selling
                              prices  increases  or  decreases by more than 15%.
                              See following table:

<TABLE>
<CAPTION>


                          Year 1               Year 2                 Year 3               Year 4
                          ------               ------                 ------               ------

<S>                      <C>                   <C>                    <C>                  <C>   
Annual Sale Price        [*****]               [*****]                [*****]              [*****]

Manufacturing Cost       [*****]               [*****]                [*****]              [*****]

Transfer Price           [*****]               [*****]                [*****]              [*****]

</TABLE>

Other terms:                  Parties   to  explore  in  good  faith  bona  fide
                              opportunities  for joint  manufacturing  (provided
                              such  opportunity  does  not  result  in  material
                              adverse  financial  consequences to either party).
                              If parties agree to such an  arrangement,  parties
                              to share equally any  manufacturing  costs savings
                              that are achieved.




- -------------
     [****]  REPRESENTS  MATERIAL WHICH HAS BEEN REDACTED  PURSUANT TO A REQUEST
FOR CONFIDENTIAL  TREATMENT PURSUANT TO RULE 24B-2 UNDER THE SECURITIES EXCHANGE
ACT OF 1934, AS AMENDED.

                                       ii
<PAGE>
                                   SCHEDULE 6A


                             TERMS AND CONDITIONS OF
                     GLOBAL STOCKING DISTRIBUTION AGREEMENT


General:                      S&N to have exclusive distribution rights (subject
                              to the  provisions  of  Section  6(a)(i)  of  this
                              Agreement)  for the sale,  promotion and marketing
                              of Products in all countries  other than Japan and
                              with respect to China,  Korea and Taiwan,  subject
                              to Teijin Limited's  distribution  rights pursuant
                              to an  undated  one page  letter  from  Exogen  to
                              Teijin  ("Letter  Agreement").Upon  written notice
                              from  S&N  of  its   intention   to  exercise  its
                              distribution rights in one or more of China, Korea
                              and Taiwan  (subject only to Teijin's rights under
                              the Letter  Agreement,  Exogen will notify  Teijin
                              Limited and commence  negotiations with respect to
                              such designated  country or pursuant to the Letter
                              Agreement.  If Teijin and Exogen do not enter into
                              an  agreement  covering the  specified  country or
                              countries within the specified time period, Exogen
                              shall so  notify  S&N and S&N  shall be  deemed to
                              have  exercised  its option with  respect to these
                              countries.


Term of Agreement:            From  execution and delivery  until July 30, 2008,
                              unless terminated  earlier pursuant to termination
                              rights.   S&N  to  have   option   to  renew   for
                              consecutive    three-year    terms   on   mutually
                              acceptable  terms  and  conditions.  If terms  and
                              conditions  of the  first  renewal  term  are  not
                              agreed to, then the agreement shall be renewed for
                              one five  years  period on a  non-exclusive  basis
                              with no Minimum Number of Orders requirements.

    
Termination rights:           Material  default by other party not cured  within
                              60 days after notice.


Exogen's                      Manufacturing,  shipment  FOB New  Jersey  to S&N,
responsibilities:             product training to S&N's sales personnel, product
                              warranty work at Exogen's expense, provision of up
                              to 100  demonstration  units  annually at standard
                              manufacturing   cost  plus  25%,   maintenance  of
                              regulatory    approvals,    CE    mark,    quality
                              registrations and 

                                      iii
<PAGE>
                              intellectual  property  rights  in good  standing,
                              except  as S&N may be  responsible  in  accordance
                              with the next succeeding paragraph.

S&N's                         Sales,  marketing,   promotion  and  distribution.
responsibilities:             Minimum  Number  of  Units   requirements   to  be
                              negotiated  in good  faith  for the  first two (2)
                              years of the term and shall be  negotiated in good
                              faith  at least  six  months  prior  to each  year
                              thereafter.    The   Minimum   Number   of   Units
                              requirement   shall  be   determined   based  upon
                              relevant criteria on a country-by-country basis or
                              on a multiple country basis including:  the number
                              of orthopaedic surgeons;  the number of fractures;
                              population;  reimbursement;  regulatory  approvals
                              and  status;   and  S&N  experience   with  trauma
                              products.  Use  diligent  efforts  to  obtain  and
                              maintain, at S&N's expense, import, regulatory and
                              reimbursement approvals in any country (other than
                              France,  Germany and Holland)  where S&N wishes to
                              commence  distribution.  S&N to pay  for  Products
                              within the time  period to be  negotiated  in good
                              faith   (principally   based   on   the   expected
                              reimbursement cycle) on a country by country basis
                              or on a multiple country basis, depending upon the
                              arrangement.    S&N   to   be   responsible    for
                              pre-certifying,  arranging shipping, invoicing and
                              making  collections  from  patients  and/or  their
                              insurers.  S&N  to  provide  reasonable  follow-up
                              contact with physicians and patients.


Transfer prices:              To   be    negotiated   in   good   faith   on   a
                              country-by-country  basis or on a multiple country
                              basis,  prices  to be  established  for the  first
                              three years based on an estimated  average selling
                              price and manufacturing  cost (taking into account
                              the projected market size,  reimbursement  levels,
                              competition and other relevant  factors) and to be
                              renegotiated  in good faith during such three-year
                              period if the average  selling price  increases or
                              decreases by more than 15%.  All payments  will be
                              made in U.S. Dollars.


Other terms:                  Parties   to  explore  in  good  faith  bona  fide
                              opportunities  for joint  manufacturing  (provided
                              such  opportunity  does  not  result  in  material
                              adverse  financial  consequences to either party).
                              If parties agree to such an  arrangement,  parties
                              to share equally any  manufacturing  costs savings
                              that are achieved.

                                       iv
<PAGE>
                                   SCHEDULE 6B


                             TERMS AND CONDITIONS OF
               INDIVIDUAL COUNTRY STOCKING DISTRIBUTION AGREEMENT
                (PRIOR TO EXERCISE OF GLOBAL DISTRIBUTION OPTION)


General:                      S&N to have exclusive  distribution rights for the
                              sale,  promotion  and marketing of Products in the
                              country,  subject  to  rights  of  Teijin  Limited
                              described in Schedule 6A.

Term of Agreement:            From  execution and delivery  until July 30, 2008,
                              unless terminated  earlier pursuant to termination
                              rights.   S&N  to  have   option   to  renew   for
                              consecutive    three-year    terms   on   mutually
                              acceptable  terms  and  conditions.  If terms  and
                              conditions  of the  first  renewal  term  are  not
                              agreed to, then the agreement shall be renewed for
                              one five  years  period on a  non-exclusive  basis
                              with no Minimum Number of Orders requirements.

Termination rights:           Material  default by other party not cured  within
                              60 days after notice.

Exogen's                      Manufacturing,  shipment  FOB New  Jersey  to S&N,
responsibilities:             product training to S&N's sales personnel, product
                              warranty work at Exogen's expense, provision of up
                              to 100  demonstration  units  annually at standard
                              manufacturing  cost plus 25%,  maintenance of U.S.
                              regulatory    approvals,    CE    mark,    quality
                              registrations and intellectual  property rights in
                              good standing, except as S&N may be responsible in
                              accordance with the next succeeding paragraph.

S&N's                         Sales,  marketing,   promotion  and  distribution.
responsibilities:             Minimum  Number  of  Units   requirements   to  be
                              negotiated  in good  faith  for the  first two (2)
                              years of the term and shall be  negotiated in good
                              faith  at least  six  months  prior  to each  year
                              thereafter.    The   Minimum   Number   of   Units
                              requirement   shall  be   determined   based  upon
                              relevant criteria on a country-by-country basis or
                              on a multiple country basis including:  the number
                              of orthopaedic surgeons;  the number of fractures;
                              population;  reimbursement;  regulatory  approvals
                              and  status;   and  S&N  experience   with  trauma
                              products.  Use  diligent  efforts  to  obtain  and
                              maintain, at S&N's expense, import, regulatory and
                              reimbursement approvals in any country (other than
                              U.S.,  France,  Germany  and

                                       v
<PAGE>
                              Holland)    where   S&N    wishes   to    commence
                              distribution.  S&N to pay for Products  within the
                              time  period to be  negotiated  in good faith on a
                              country-by-country  basis or on a multiple country
                              basis, depending on the distribution  arrangement.
                              S&N   to  be   responsible   for   pre-certifying,
                              arranging    shipping,    invoicing   and   making
                              collections  from patients  and/or their insurers.
                              S&N to provide  reasonable  follow-up contact with
                              physicians and patients.

Transfer prices:              To be  negotiated  in  good  faith;  prices  to be
                              established  for the first three years based on an
                              estimated  average selling price and manufacturing
                              cost  (taking into  account the  projected  market
                              size, reimbursement levels,  competition and other
                              relevant  factors) and to be  renegotiated in good
                              faith if the average  selling  prices  increase or
                              decrease by more than 15% during  such  three-year
                              period. All payments will be made in U.S. Dollars.




                                       vi
<PAGE>

                                   SCHEDULE 7


                      TERMS AND CONDITIONS TO SERVE AS THE
                        BASIS FOR GOOD FAITH NEGOTIATIONS


Any  such  agreement  that  involves  the  formation  of a joint  venture  would
contemplate (i)  administration of the joint venture by a board consisting of an
equal number of representatives  of S&N and Exogen,  (ii) contribution by Exogen
of such technology,  infrastructure  and licenses as shall be agreed upon, (iii)
contribution by S&N of such cash and regulatory support as shall be agreed upon,
and (iv) S&N to be exclusive  distributor on a transfer price  arrangement or on
the basis of sharing total  profits/losses  (after  interest on  distributorship
capital employed).


                                      vii
<PAGE>
                                   SCHEDULE 8

                            U.S. AND FOREIGN PATENTS,
                           TRADEMARKS AND APPLICATIONS


(L) indicates license
<TABLE>
<CAPTION>

PATENTS
Index No.      Number        Country       Status      Issued (Filing)    Inventor(s)             Description   
- ------------------------------------------------------------------------------------------------------------------------
Ultrasound
<S>          <C>            <C>         <C>            <C>               <C>             <C>                           
    1*       4530360        USA         Issued         7/23/85           Duarte          Method for Healing Bone
                                                                                         Fractures by Ultrasound
     2       5003965 /      USA         Issued         4/2/91            Talish /        Medical Device for Ultrasonic
             8042                                                        Lifshey         Treatment of Living Tissue
                                                                                         and/or Cells
    2A       1328485 /      Canada      Issued                           Talish /        Medical Device for Ultrasonic
             8042                                                        Lifshey         Treatment of Living Tissue
                                                                                         and/or Cells
     3       5186162 /      USA         Issued         2/16/93           Talish /        Ultrasonic Transducer Device
             0089                                                        Lifshey         for Treatment of Living
                                                                                         Tissues and/or Cells
     4       5211160 /      USA         Issued         5/18/93           Talish /        Ultrasound Orthopaedic
             0090                                                        Lifshey         Treatment Head and Body -
                                                                                         Mounting Means Therefor
     5       5520612 /      USA         Issued         5/28/96           Winder /        Acoustic System for Bone
             4031                                                        Talish / Ryaby  Fracture Therapy
    5A       Kokai #        Japan       Published      12/17/96          Winder /        Acoustic System for Bone
             8-332209                                                    Talish / Ryaby  Fracture Therapy
             601-11J
             (Cross
             Reference:
             Section 28)
    5B       080390 4031    Taiwan      Issued         8/11/96           Winder /        Acoustic System for Bone
                                                                         Talish et al    Fracture Therapy
     6       5556372 /      USA         Issued         9/17/96           Talish /        Apparatus for Ultrasonic Bone
             601-8                                                       Ryaby et al     Treatment (SAFHS 2000(R))
</TABLE>
- -------------
     * Patent Term Extension under 35 USC#156:Filed 12/5/94;  Extension received
5/31/96; term extension --5 years to 11/12/2007.


                                      vii
<PAGE>
<TABLE>
<CAPTION>
<S>          <C>            <C>         <C>            <C>               <C>             <C>   
    6B       Pub.           EPO         Published      12/03/97          Talish /        Apparatus for Ultrasonic Bone
             #0-809-470                                                  Ryaby et al     Treatment (SAFHS 2000(R))
             601-8 PCT/EPO
    6F       Kokai          Japan       Published      9/17/96           Talish /        Acoustic System for Bone
             #8-238284                                                   Ryaby et al     Fracture Therapy
             601-8 Japan
     7       5626554 /      USA         Issued         5/6/97            Ryaby /         Gel Containment Structure
             601-4                                                       Talish /
                                                                         McCabe
     8       5755746        USA         Issued         5/26/98           Talish /        Locator Method & Apparatus
             601-3FWC                                                    Lifshey
    8B       Pub.           EPO         Published      12/12/97          Talish /        Locator Method & Apparatus
             #0-810-844                                                  Lifshey
             601-3 PCT/EPO
    8D       PCT/US95-1     China       Published      3/14/98           Talish /        Locator Method & Apparatus
             96742.I                    #CN-1175195A                     Lifshey
             601-3
             PCT/China
     9       5762616 601-7  USA         Issued         6/9/98            Talish          Apparatus for Ultrasonic
                                                                                         Treatment of Sites
                                                                                         Corresponding to the Torso
    9A       PCT/US97       PCT         Published      9/18/97           Talish          Apparatus for Ultrasonic
             WO97 / 33649                                                                Treatment of Sites
             601-7 PCT                                                                   Corresponding to the Torso
    11       D380440 601-9  USA         Issued         7/1/97            Talish /        Ultrasonic Transducer Housing
                                                                         Ryaby /         (Design Patent)
                                                                         Urgovitch
    11A      Reg. #         Japan       Registered     8/29/97           Talish /        Ultrasonic Transducer Housing
             998899 601-9J                                               Urgovitch /     (Japanese Design Patent)
                                                                         Scowen / Ryaby
    12*      5730705        USA         Issued         3/24/98           Talish /        Ultrasonic Treatment for Bony
             661905 601-13                                               Ryaby /         Ingrowth
                                                                         Tanzer / Bobyn
    25A      WO98 / 10729   PCT         Published      3/19/98           Talish          Cast Punch
             601-19 PCT
</TABLE>


- ------------
*Co-owned between Exogen, Inc. and inventors.

                                       ix
<PAGE>
<TABLE>
<CAPTION>
<S>          <C>            <C>         <C>            <C>               <C>             <C>   

    28       Kokai          Japan       Published      (10/28/97)        Winder /        Acoustic System for Bone
             #9-276352                                                   Talish / Ryaby  Fracture Therapy
             601-47 PCT
             Japan
             (Cross-reference:
             Section 5A)

Mechanical Strain
   2 (L)     5273028 /      USA         Issued         12/28/93          McLeod / Rubin  Non-Invasive Means for
             3009                                                                        In-Vivo Bone Growth
                                                                                         Stimulation
  2A (L)     183314         Mexico      Issued         5/23/93           McLeod / Rubin  Non-Invasive Means for
             1450-002                                                                    In-Vivo Bone Growth
                                                                                         Stimulation
  2C (L)     667113         Australia   Issued         5/26/93           McLeod / Rubin  Non-Invasive Means for
             2030/3009                                                                   In-Vivo Bone Growth
                                                                                         Stimulation
   3 (L)     5376065 3018   USA         Issued         12/27/94          McLeod / Rubin  Non-Invasive Method for
                                                                                         In-Vivo Bone Growth
                                                                                         Stimulation
   4 (L)     5103806 2025A  USA         Issued         4/14/92           McLeod / Rubin  Method for the Promotion of
                                                                                         Growth, Ingrowth & Healing of
                                                                                         Bone Tissue & Prevention of
                                                                                         Osteopenia by Mechanical
                                                                                         Loading of the Bone Tissue
   5 (L)     5191880 2025B  USA         Issued         3/9/93            McLeod / Rubin  Method for the Promotion of
                                                                                         Growth, Ingrowth & Healing of
                                                                                         Bone Tissue & Prevention of
                                                                                         Osteopenia by Mechanical
                                                                                         Loading of the Bone Tissue
Other
  1 (L)     4993413/        USA         Issued         2/19/91           McLeod /       Electromagnetic: Method and
            2032                                                         Rubin          Apparatus for Inducing a
                                                                                        Current and Voltage in Living
                                                                                        Tissue
    2       4719907         USA         Issued         1/19/88           Banko          Orthopedic Pin Placement Guide
            3.0-001


</TABLE>
                                       x
<PAGE>
<TABLE>
<CAPTION>
<S>          <C>            <C>         <C>            <C>               <C>             <C>   
PATENT APPLICATIONS

Index No.       Number         Country       Status     Issued (Filing)    Inventor(s)             Description
                                                              Date



                                                         [****]
 
TRADEMARKS

Index No.  Number            Country      Status        Issued (Filing)   Trademark
                                                        Date
    1      650974 10.1-002   USA          Registered    11/3/87           SAFHS(R)
    1A      7-112401 /        Japan        Listed        (10/31/95)        SAFHS(R)
           10.1-002J
    1B      548993 /          Canada       Registered    4/10/92           SAFHS(R)
           10.1-002C         Mexico
     2      74/530521         USA          Registered    7/11/95           EXOGEN(R)
           10.1-008
     3      720034 /          USA          Registered    7/16/96           SAFHS 2000(R)
           10.1-009
    3A      7 / 111521 /      Japan        Listed        (10/30/95)        SAFHS 2000(R)
           10.1-009J

TRADEMARK APPLICATIONS

Index No.  Number            Country      Status        Issued (Filing)   Trademark
                                                        Date
   2A      7-111520 /        Japan        Pending       (10/30/95)        EXOGEN(R)
           10.1-011J
    3A      7 / 111521 /      Mexico       Pending       (10/30/95)        SAFHS 2000(R)
           10.1-009J         Canada       Pending
     4      317,761 Exogen    USA          Pending       (7/1/97)          EXOGEN 2000(TM)
           10.-007

</TABLE>
- ------------
     [****]  REPRESENTS  MATERIAL WHICH HAS BEEN REDACTED  PURSUANT TO A REQUEST
FOR CONFIDENTIAL  TREATMENT PURSUANT TO RULE 24B-2 UNDER THE SECURITIES EXCHANGE
ACT OF 1934, AS AMENDED.

                                       xi
<PAGE>
                                   SCHEDULE 9


                       CURRENT INTERNATIONAL ARRANGEMENTS


Note on termination rights/notice periods

Rights  to  terminate  and  the  notice   periods  for   termination   of  sales
representative,  distribution, marketing and consulting arrangements are subject
to  applicable  laws and  regulations.  This  Schedule 9  summarizes  the notice
periods Exogen believes are due under  applicable local laws as they exist as of
the Initial Closing Date. The laws of many countries require that notice periods
be extended depending on the duration of the sales representative, distribution,
marketing or consulting  arrangements.  Thus the  termination  rights and notice
periods  stated  below  may  change  due  to  the  continued  duration  of  such
arrangements and/or changes in applicable laws and regulations.

                                     [****]


- ------------
     [****]  REPRESENTS  MATERIAL WHICH HAS BEEN REDACTED  PURSUANT TO A REQUEST
FOR CONFIDENTIAL  TREATMENT PURSUANT TO RULE 24B-2 UNDER THE SECURITIES EXCHANGE
ACT OF 1934, AS AMENDED.


                                      xii
<PAGE>


                                   SCHEDULE 10

                                REQUIRED CONSENTS

                                      None



                                      xiii


                                                                   EXHIBIT 10.23
                                      CONFIDENTIAL TREATMENT HAS BEEN SOUGHT FOR
                           PORTIONS OF THIS EXHIBIT PURSUANT TO RULE 24B-2 UNDER
                                THE SECURITIES EXCHANGE ACT OF 1934, AS AMENDED.




                                  EXOGEN, INC.



                         COMMON STOCK PURCHASE AGREEMENT



                                 August 10, 1998



<PAGE>
                                TABLE OF CONTENTS


                                                                          Page
                                                                          ----

1.       Purchase and Sale of Stock..........................................1
         1.1.     Sale and Issuance of Common Stock..........................1
         1.2.     Closing....................................................1
         1.3.     Actions at the Closing.....................................1

2.       Representations and Warranties of the Company.......................2
         2.1.     Organization and Good Standing; Power and Authority;
                  Qualifications.............................................2
         2.2.     Authorization..............................................2
         2.3.     Capitalization.............................................3
         2.4.     Valid Issuance of Common Stock.............................3
         2.5.     Consents...................................................3
         2.6.     Litigation.................................................3
         2.7.     Compliance with Other Instruments..........................4
         2.8.     Financial Statements.......................................4
         2.9.     SEC Filings................................................4
         2.10.    Other Information..........................................5
         2.11.    Intellectual Property Rights...............................5
         2.12.    Title to Assets and Properties; Insurance..................6
         2.13.    Compliance with Laws; Permits..............................6
         2.14.    Offering Exemption.........................................7
         2.15.    Taxes......................................................7

3.       Representations and Warranties of S&N...............................7
         3.1.     Authorization..............................................7
         3.2.     Purchase Entirely for Own Account..........................7
         3.3.     Disclosure of Information..................................8
         3.4.     Investment Experience......................................8
         3.5.     Accredited Investor........................................8
         3.6.     Restricted Securities......................................8

4.       Use of Proceeds.....................................................8

5.       Transfer Taxes......................................................8

6.       Expenses............................................................9

7.       Miscellaneous.......................................................9
         7.1.     Survival of Warranties.....................................9
         7.2.     Successors and Assigns.....................................9
         7.3.     Governing Law..............................................9
         7.4.     Counterparts...............................................9
         7.5.     Titles and Subtitles.......................................9
         7.6.     Notices....................................................9

                                       i
<PAGE>

         7.7.     Finder's Fee..............................................10
         7.8.     Attorneys' Fees...........................................10
         7.9.     Amendments and Waivers....................................10
         7.10.    Severability..............................................10
         7.11.    Entire Agreement..........................................10
         7.12.    Press Releases and Announcements..........................10


                                       ii
<PAGE>

                                    SCHEDULES


Schedule 1.3(b)

Schedule 2.3

Schedule 2.5

Schedule 2.6

Schedule  2.11

Schedule  2.13




                                      iii
<PAGE>


                                     ANNEXES

ANNEX A                    -        Registration Rights Agreement

ANNEX B                    -        Secretary's Certificate

ANNEX C                    -        Opinion of Brobeck, Phleger & Harrison LLP




                                       iv
<PAGE>
                         COMMON STOCK PURCHASE AGREEMENT


                  THIS STOCK  PURCHASE  AGREEMENT  is made as of the 10th day of
August,  1998,  by  and  between  Exogen,  Inc.,  a  Delaware  corporation  (the
"Company"), and Smith & Nephew Holdings, Inc., a Delaware corporation ("S&N").


                  THE PARTIES HEREBY AGREE AS FOLLOWS:


                  1. Purchase and Sale of Stock.

                  1.1. Sale and Issuance of Common  Stock.  Subject to the terms
and conditions of this Agreement,  S&N agrees to purchase at the Closing and the
Company  agrees to sell and issue to S&N at the Closing,  820,000  shares of the
Company's  common  stock,  $.0001  par value per share  ("Common  Stock"),  at a
purchase  price  per  share  of  $5.00  (such  transaction  referred  to as  the
"Purchase"  and the aggregate  purchase  price of $4,100,000  referred to as the
"Purchase Price").

                  1.2. Closing.  The purchase and sale of the Common Stock shall
take place at the offices of Brobeck,  Phleger & Harrison  LLP,  1633  Broadway,
47th floor,  New York,  New York 10019 at 10:00 a.m. New York Time,  on the date
hereof,  or at such time and place upon which the  Company  and S&N shall  agree
(the  "Closing").  To the extent  possible,  at the Closing,  the Company  shall
deliver to S&N a certificate or certificates representing the Common Stock which
S&N is purchasing, registered in the name of S&N or its nominee, against payment
of the Purchase Price by wire transfer to the Company's bank account (designated
at least one  business  day prior to the  Closing) in the amount of the Purchase
Price.  If the Company is not able to deliver the certificate  representing  the
Common Stock at Closing,  then the Company shall deliver such  certificate(s) to
S&N no later than five (5) business days following the Closing.

                  1.3. Actions at the Closing. Simultaneously with, or prior to,
the execution and delivery of this Agreement, the following actions shall occur:

                      (a) The Registration  Rights Agreement (the  "Registration
Rights  Agreement"),  by and between the Company and S&N,  substantially  in the
form of  Annex A  hereto,  and  all  other  schedules,  certificates  and  other
documents  being  delivered  pursuant to or in connection with this Agreement by
any party hereto at or prior to the Closing shall be duly executed and delivered
by the parties thereto.

                      (b) The Company shall deliver to S&N  certificates of good
standing  from the  jurisdictions  set forth on Schedule  1.3(b)  under its name
dated as of a date no earlier than five days prior to the Closing.

                      (c) The Common Stock to be issued shall have been approved
for listing on The NASDAQ Stock Market, subject to official notice of issuance.
<PAGE>
                      (d)  The  Company  shall  deliver  to  S&N  a  certificate
executed by the secretary of the Company,  substantially  in the form of Annex B
hereto,  certifying (i) a copy of its  organizational  documents  (including the
Certificate  of  Incorporation  and  bylaws of the  Company),  (ii)  resolutions
authorizing the transaction and (iii) incumbency matters.

                      (e) S&N shall  receive  from  Brobeck,  Phleger & Harrison
LLP,  counsel for the  Company,  an opinion  addressed  to S&N,  dated as of the
Closing,  satisfactory  in form and  substance to S&N,  which shall  include the
opinions set forth in Annex C hereto. 

                  2.  Representations and Warranties of the Company. The Company
hereby represents and warrants to the S&N and Smith & Nephew, Inc. that:

                  2.1.  Organization  and Good  Standing;  Power and  Authority;
Qualifications.  Each of the Company and its subsidiary, Exogen (Europe) GmbH, a
German corporation (the "Subsidiary") is duly organized, validly existing and in
good standing under the laws of its  jurisdiction of  organization  and (ii) has
all requisite  power and authority to own,  lease and operate its properties and
to carry on its business as presently conducted and as proposed to be conducted.
The Company has all  requisite  power and  authority to enter into and carry out
the  transactions  contemplated  by this Agreement and the other documents being
delivered  pursuant to or in  connection  with this  Agreement  to which it is a
party.  Each of the Company and its Subsidiary is qualified to transact business
as a foreign  corporation  in, and is in good standing  under the laws of, those
jurisdictions that constitute all of the jurisdictions  wherein the character of
the  property  owned or leased or the nature of the  activities  conducted by it
makes  such  qualification  necessary  and where  failure  to so  qualify  would
individually  or in  the  aggregate  have  a  material  adverse  effect  on  the
properties,  business, prospects,  operations,  earnings, assets, liabilities or
the condition  (financial or otherwise) of the Company and its Subsidiary  taken
as a whole,  whether or not in the  ordinary  course of  business  (a  "Material
Adverse Effect").  All of the outstanding  shares of capital stock of each class
(other than  director  qualifying  shares) of the  Subsidiary  have been validly
issued  and fully  paid and  nonassessable,  and are owned  beneficially  and of
record, by the Company, free and clear of Encumbrances.

                  2.2.  Authorization.  All corporate  action on the part of the
Company,   its   officers,   directors  and   shareholders   necessary  for  the
authorization,  execution and delivery of this Agreement and the other documents
being delivered by the Company  pursuant to or in connection with this Agreement
, the performance of all obligations of the Company hereunder and thereunder and
the  authorization,  issuance  and  delivery  of the  Common  Stock  being  sold
hereunder has been taken,  and this Agreement and the other documents  delivered
by this Company  pursuant to or in  connection  with this  Agreement  constitute
valid and legally binding  obligations of the Company,  enforceable  against the
Company in  accordance  with their  respective  terms,  except (i) as limited by
applicable bankruptcy, insolvency, reorganization, moratorium, and other laws of
general application affecting  enforcement of creditors' rights generally,  (ii)
as  limited  by laws  relating  to the  availability  of  specific  performance,
injunctive  relief,  or other  equitable  remedies,  and (iii) to the extent the
indemnification provisions contained in the Registration Rights Agreement may be
limited by applicable federal or state securities laws.


                                      -2-
<PAGE>
                  2.3.  Capitalization.  The  authorized  capitalization  of the
Company immediately following the Purchase will consist of: (a) 3,000,000 shares
of preferred stock of the Company (the "Preferred Stock"),  par value $.0001 per
share, of which no shares are issued and outstanding;  and (b) 27,000,000 shares
of  Common  Stock,  par  value  $.0001  per  share  ("Common  Stock"),  of which
11,882,718  shares are issued and outstanding as of August 6, 1998, and all such
outstanding shares are validly issued, fully paid and nonassessable. No class of
capital stock ("Capital Stock") of the Company is entitled to preemptive rights.
As of August 6, 1998, there are no outstanding options,  warrants,  subscription
rights,  calls or  commitments  of any  character  whatsoever  relating  to,  or
securities or rights  convertible  into, shares of any class of Capital Stock of
the  Company,  or  contracts  by which the Company or its  Subsidiary  is or may
become  bound  to issue  additional  shares  of its  Capital  Stock or  options,
warrants or other rights to purchase or acquire any shares of its Capital Stock,
except as follows:  (i) 1,350,000  shares of Common Stock have been reserved for
issuance  pursuant to the Company's  1995 Stock  Option/Stock  Issuance Plan (of
which options to purchase 1,025,560 shares of Common Stock have been granted and
are  outstanding),  (ii) 350,000  shares of Common Stock have been  reserved for
issuance  pursuant  to the  Company's  Employee  Stock  Purchase  Plan (of which
164,811  shares of Common  Stock have been  purchased  and are included in total
shares of Common  Stock  outstanding),  and (iii) as set forth on  Schedule  2.3
hereto,  shares of Common  Stock  reserved  for  issuance  pursuant to a certain
warrant to purchase Common Stock of the Company and certain warrant obligations.
The Company has not declared or paid any dividend or made any other distribution
of cash, stock or other property to its stockholders.

                  2.4. Valid Issuance of Common Stock. The Common Stock which is
being purchased by S&N hereunder,  when issued, sold and delivered in accordance
with the terms hereof for the consideration  expressed herein,  will be duly and
validly issued and outstanding,  fully paid and  nonassessable  with no personal
liability   attaching  to  the  ownership   thereof,   free  and  clear  of  any
Encumbrances,  other than  Encumbrances,  if any, arising as a result of actions
taken by S&N, and not subject to preemptive or similar rights of stockholders of
the Company or others.

                  2.5. Consents.  Except as disclosed on Schedule 2.5 hereto and
for  any  post-Closing  notifications  or  filings  as  may  be  required  under
applicable  federal or state  securities  laws, if any, which shall be made on a
timely basis, no consent,  approval, order or authorization of, or registration,
qualification, designation, declaration or filing with, any person (governmental
or  private)  on the  part of the  Company  or its  Subsidiary  is  required  in
connection  with  the  consummation  of the  transactions  contemplated  by this
Agreement  and the other  documents  delivered by the Company  pursuant to or in
connection with this Agreement.

                  2.6. Litigation.  Except as set forth in the SEC Documents (as
defined below),  there is no civil,  criminal or  administrative  action,  suit,
claim, notice, hearing, inquiry, proceeding or investigation at law or in equity
by  or  before   any  court,   arbitrator   or   similar   panel,   governmental
instrumentality  or other  agency now pending or, to the best  knowledge  of the
Company,  threatened  against  the  Company  or its  Subsidiary  or any of their
respective  directors or executive officers in their capacities as directors and
executive  officers of the  Company or the assets  (including  the  Intellectual
Property) of the Company or its Subsidiary (a "Litigation"). Neither the Company
nor its Subsidiary is a party or subject to the  provisions of any order,  writ,
injunction,   judgment  or  decree  of  any  court  or   government   agency  or
instrumentality.  There is

                                      -3-
<PAGE>
no action,  suit,  proceeding or  investigation by the Company or its Subsidiary
currently  pending or which either of the Company or its  Subsidiary  intends to
initiate.

                  2.7. Compliance with Other Instruments.  The Company is not in
violation  or  default of any  provisions  of its Second  Amended  and  Restated
Certificate of Incorporation or Amended and Restated Bylaws. Neither the Company
nor  its  Subsidiary  is in  violation  or  default  of  any  provisions  of any
instrument,  judgment, order, writ, decree or contract to which it is a party or
by which it is bound, or to the best knowledge of the Company,  of any provision
of  domestic  (federal,  state  or  local)  or  foreign  law,  statute,  rule or
regulation  applicable  to the  Company  or the  Subsidiary  except  where  such
violation  or  default  would  not,  individually  or in the  aggregate,  have a
Material  Adverse  Effect.  The  execution,  delivery  and  performance  of this
Agreement  and the other  documents  delivered by the Company  pursuant to or in
connection  with this  Agreement  by the  Company  and the  consummation  of the
transactions  contemplated  hereby and  thereby  will not (x) result in any such
violation or be in conflict with or  constitute,  with or without the passage of
time  and  giving  of  notice,  either  a  default  under  any  such  agreement,
instrument,  judgment,  order,  writ,  decree  or  contract  referred  to in the
previous sentence (including any registration rights agreements),  or (y) result
in the  creation  of any lien,  charge  or  Encumbrance  upon any  assets of the
Company or its Subsidiary or the suspension, revocation, impairment, forfeiture,
or  nonrenewal  of any  material  permit,  license,  authorization,  or approval
applicable to the Company or its Subsidiary, their business or operations or any
of their assets or properties.

                  2.8. Financial Statements. The financial statements (including
any related schedule and/or notes) included in the SEC Documents (the "Financial
Statements")  are complete  and correct in all  material  respects and have been
prepared in accordance with generally accepted accounting  principles applied on
a consistent basis throughout the periods  indicated.  The Financial  Statements
fairly present the consolidated financial condition,  operating results, changes
in  shareholders'  equity and cash flows of the Company as of the dates, and for
the periods,  indicated therein.  Except as set forth in the SEC Documents,  the
Company has no liabilities or obligations,  contingent or otherwise,  except (i)
liabilities  and  obligations  in the respective  amounts  reflected or reserved
against in the Company's  balance  sheet (the  "Balance  Sheet") as of March 31,
1998 included in the SEC Documents or (ii) liabilities and obligations  (matured
or unmatured, fixed or contingent) incurred since March 31, 1998 in the ordinary
course of business  consistent  (in amount and kind) with past practice (none of
which is a liability  resulting  from breach of  contract,  breach of  warranty,
tort, infringement,  claim or lawsuit) which individually or in the aggregate do
not have a Material  Adverse  Effect.  Since March 31, 1998, the Company and its
Subsidiary  have operated their  business only in the ordinary  course and there
has not been  individually  or in the  aggregate  any  change  that would have a
Material  Adverse  Effect (a  "Material  Adverse  Change")  other  than  changes
disclosed in the SEC Documents.  Except as set forth in the SEC  Documents,  the
Company has never had, nor does it presently have, any subsidiaries,  nor has it
owned,  nor does it presently own,  whether  directly or indirectly  owned,  any
capital stock or other  proprietary  interest,  directly or  indirectly,  in any
corporation, association, trust, partnership, joint venture or other entity.

                  2.9. SEC Filings.  The Company has filed all proxy statements,
reports  and other  documents  required  to be filed by it under the  Securities
Exchange Act of 1934,  as amended (the  "Exchange  Act") from and after July 20,
1995 (the "SEC Documents"), and the 

                                      -4-
<PAGE>
Company has delivered to the Investor  copies of all SEC Documents so filed from
and after October 1, 1997.  Each SEC Document was in compliance in all materials
respects  with the  requirements  of its  respective  report form and, as of its
filing date, no such SEC Document  filed by the Company with the  Securities and
Exchange Commission ("SEC") contained any untrue statement of a material fact or
omitted to state any material fact required to be stated therein or necessary in
order to make the  statements  made therein,  in the light of the  circumstances
under which they were made, not misleading.

                  2.10.  Other  Information.  The Company has  delivered  to S&N
copies  of all press  releases,  reports  to  stockholders  and other  documents
released to the public since October 1, 1997.

                  2.11.  Intellectual  Property  Rights.  Except as disclosed on
Schedule  2.11(a)  hereto,  to  the  Company's  knowledge  the  Company  or  its
Subsidiary  owns or has the right to use all of the  Intellectual  Property  (as
defined below) necessary,  required or desirable for the conduct of its business
as presently or as presently proposed to be conducted,  except where the absence
of any  thereof  would not  individually  or in the  aggregate  have a  Material
Adverse Effect.

                      (a) Except as disclosed on Schedule  2.11(b),  neither the
Company  nor  its   Subsidiary   has   interfered   with,   infringed   upon  or
misappropriated  any Intellectual  Property rights of third parties,  except for
interferences,  infringements and misappropriations which would not individually
or in the aggregate have a Material Adverse Effect,  and neither the Company nor
its  Subsidiary  has  received  any claim,  demand or notice  alleging  any such
interference, infringement or misappropriation (including any claim that it must
license or  refrain  from using any  Intellectual  Property  rights of any third
party).  To the best  knowledge  of the Company,  no third party has  interfered
with, infringed upon or misappropriated any Intellectual  Property rights of the
Company  or  its  Subsidiary,   except  for  interferences,   infringements  and
misappropriations  which  would  not  individually  or in the  aggregate  have a
Material Adverse Effect.

                  As used in this Agreement,  "Intellectual  Property" means all
intellectual  property  owned,  leased,  licensed  or used by the Company or its
Subsidiary,  including  without  limitation,  (i) all world wide  inventions and
discoveries  (whether  patentable or unpatentable  and whether or not reduced to
practice),  all improvements  thereto, and all patents,  patent applications and
patent    disclosures,    together   with   all   reissuances,    continuations,
continuations-in-part,  revisions,  extensions and reexaminations  thereof, (ii)
all trademarks,  service marks,  trade dress,  logos,  trade names and corporate
names, together with all translations, adaptations, derivations and combinations
thereof and including all goodwill associated  therewith,  and all applications,
registrations,  renewals and  derivatives  in  connection  therewith,  (iii) all
copyrightable  works,  all copyrights and all  applications,  registrations  and
renewals  in  connection  therewith,  (iv) all mask works and all  applications,
registrations  and renewals in connection  therewith,  (v) all  know-how,  trade
secrets  and   confidential   business   information,   whether   patentable  or
unpatentable and whether or not reduced to practice  (including ideas,  research
and development, know-how, formulas, compositions,  manufacturing and production
processes and techniques,  technical data,  designs,  drawings,  specifications,
customer  and  supplier  lists,  addresses,  phone  numbers,  pricing 


                                   -5-

<PAGE>
and cost information,  and business and marketing plans and proposals), (vi) all
other proprietary  rights of any type or description  (regardless of whether the
same have been formally  registered),  (vii) all copies and tangible embodiments
thereof (in whatever  form or medium) and (viii) all licenses and  agreements in
connection with the foregoing.

                  2.12. Title to Assets and Properties; Insurance.

                      (a) Each of the  Company and its  Subsidiary  has good and
marketable title, or a valid leasehold  interest in or contractual right to use,
all of its assets and  properties,  free and clear of any mortgages,  judgments,
claims,  liens,  security  interests,   pledges,   escrows,   charges  or  other
encumbrances  of any kind or character  whatsoever  ("Encumbrances"),  except in
each case for such defects in title and such other liens and Encumbrances  which
do not individually or in the aggregate materially detract from the value to the
Company or its  Subsidiary of the  properties  and assets of the Company and its
Subsidiary taken as a whole.

                      (b) The Company and its Subsidiary  maintain  insurance in
such  amounts  (to  the  extent  available  in  the  public  market),  including
self-insurance,  retainage and deductible arrangements,  and of such a character
as is reasonable for companies  engaged in the same or similar  business. 


                  2.13.Compliance with Laws; Permits.

                      (a) Except as provided in Schedule  2.13,  the Company and
its  Subsidiary  are in  compliance,  and the  business  of the  Company and its
Subsidiary have been conducted in compliance with, all federal, state, local and
foreign laws, rules, ordinances, codes, consents, authorizations, registrations,
regulations, decrees, directives, judgments and orders applicable to them, their
business  and the  ownership  of their  assets  including,  but not  limited to,
Environmental  Laws (as defined  below) except where the failure to comply would
not individually or in the aggregate have a Material Adverse Effect. The Company
and its  Subsidiary  have all  federal,  state,  local and foreign  governmental
licenses,  permits,  qualifications and authorizations  ("Permits") necessary in
the conduct of the business as currently conducted. All such Permits are in full
force and effect,  and no  violations  have been recorded in respect of any such
Permits;  no  proceeding  is pending or, to the best  knowledge  of the Company,
threatened  to revoke  or limit  any such  Permit;  and no such  Permit  will be
suspended,  canceled  or  adversely  modified as a result of the  execution  and
delivery  of this  Agreement  or the other  documents  delivered  by the Company
pursuant to or in connection  with this  Agreement and the  consummation  of the
transactions  contemplated  hereby or  thereby,  except in any of the  foregoing
cases  where  failure  to have  such  Permit  would not  individually  or in the
aggregate have a Material Adverse Effect.

                      (b) For purposes of this Agreement,  "Environmental  Laws"
means,   without   limitation,   the   Comprehensive   Environmental   Response,
Compensation  and Liability Act, 42 U.S.C.  ss.ss.  9601, et seq.; the Emergency
Planning and Community  Right-to-Know  Act of 1986, 42 U.S.C.  ss.ss.  11001, et
seq.;  the Resource  Conservation  and Recovery Act, 42 U.S.C.  ss.ss.  6901, et
seq.;  the Toxic  Substances  Control Act, 15 U.S.C.  ss.ss.  2601, et seq.; the
Federal  Insecticide,  Fungicide,  and Rodenticide Act, 7 U.S.C.  ss.ss. 136, et
seq.;  the Clean Air Act, 42 U.S.C.  ss.ss.  7401, et seq.;  the Clean Water Act
(Federal Water Pollution Control Act), 33 U.S.C.

                                      -6-
<PAGE>
ss.ss.  1251, et seq.;  the Safe Drinking Water Act, 42 U.S.C.  ss.ss.  300f, et
seq.; the Occupational Safety and Health Act, 29 U.S.C. ss.ss. 641, et seq.; the
Hazardous  Materials  Transportation Act, 49 U.S.C. ss.ss. 1801, et seq.; as any
of the above  statutes have been or may be amended from time to time,  all rules
and regulations promulgated pursuant to any of the above statutes, and any other
foreign,  federal,  state or local law, statute,  ordinance,  rule or regulation
governing  environmental  matters,  as the same have been or may be amended from
time to time,  including  any common law cause of action  providing any right or
remedy with respect to environmental  matters,  and all applicable  judicial and
administrative decisions, orders, and decrees relating to environmental matters.

                  2.14.  Offering  Exemption.   Assuming  the  accuracy  of  the
representations and warranties contained in Section 3 hereof, the offer and sale
of the Common Stock and the issuance and delivery of the Common Stock to S&N are
each exempt from registration  under the Securities Act of 1933, as amended (the
"Securities  Act") and under applicable state securities and "blue sky" laws, as
currently in effect and are otherwise in compliance with applicable  federal and
state securities laws.

                  2.15.  Taxes.  The  Company and its  Subsidiary  have filed or
caused to be filed all income tax  returns  which are  required  to be filed and
have paid or caused to be paid all Taxes (as  defined  below)  that have  become
due,  except  Taxes the  validity or amount of which is being  contested in good
faith by appropriate  proceedings  and with respect to which  adequate  reserves
have been set aside.  "Taxes," for purposes of this Agreement,  means any taxes,
assessments, duties, fees, levies, imposts, deductions, withholdings, including,
without limitation,  income,  gross receipts,  ad valorem,  value added, excise,
real or personal property,  asset,  sales, use, license,  payroll,  transaction,
capital,   net  worth  and  franchise  taxes,   estimated  taxes,   withholding,
employment,   social  security,   workers  compensation,   utility,   severance,
production,  unemployment compensation,  occupation,  premium, windfall profits,
transfer and gains taxes, or other governmental charges of any nature whatsoever
imposed by any  government  or taxing  authority  of any  country  or  political
subdivision of any country and any liabilities with respect  thereto,  including
any  penalties,  additions to tax, fines or interest  thereon,  and includes any
liability  of the  Company  and its  Subsidiary  arising  under any tax  sharing
agreement to which it is or has been a party.

                  3.   Representations   and   Warranties  of  S&N.  S&N  hereby
represents and warrants that:

                  3.1.  Authorization.  This Agreement constitutes the valid and
legally binding  obligation of S&N,  enforceable  against S&N in accordance with
its terms against S&N in accordance with their  respective  terms, (i) except as
limited by applicable bankruptcy,  insolvency,  reorganization,  moratorium, and
other laws of general  application  affecting  enforcement of creditors'  rights
generally,  (ii) as limited by laws  relating  to the  availability  of specific
performance,  injunctive relief, or other equitable  remedies,  and (iii) to the
extent the  indemnification  provisions  contained  in the  Registration  Rights
Agreement may be limited by applicable federal or state securities laws.

                  3.2. Purchase Entirely for Own Account. This Agreement is made
with S&N in reliance upon S&N's  representation  to the Company,  which by S&N's
execution of this 

                                      -7-
<PAGE>
Agreement S&N hereby confirms,  that the Common Stock to be received by S&N will
be acquired for investment for S&N's own account, not as a nominee or agent, for
investment  purposes only, and not with a view to the resale or  distribution of
any part thereof within the meaning of the  Securities  Act, and that S&N has no
present  intention  of selling,  granting  any  participation  in, or  otherwise
distributing the same. By executing this Agreement,  S&N further represents that
it does not have any contract,  undertaking,  agreement or arrangement  with any
person to sell,  transfer or grant  participation to such person or to any third
person,  with  respect to the Common  Stock.  S&N  represents  that it will not,
directly or indirectly,  offer, sell,  pledge,  transfer or otherwise dispose of
(or solicit any offers to buy,  purchase or  otherwise  acquire or take a pledge
of) any of the shares of Common Stock except in compliance  with the  Securities
Act), and the rules and regulations  promulgated thereunder and applicable state
securities  laws. S&N  represents  that it has full power and authority to enter
into this Agreement.

                  3.3.  Disclosure of Information.  S&N believes it has received
all the information it considers  necessary or appropriate for deciding  whether
to  purchase  the  Common  Stock.  S&N  further  represents  that  it has had an
opportunity to ask questions and receive answers from the Company  regarding the
terms and  conditions  of the  offering  of the  Common  Stock.  The  foregoing,
however,  does not limit or modify the  representations  and  warranties  of the
Company in Section 2 of this Agreement or the right of S&N to rely thereon.

                  3.4. Investment  Experience.  S&N is an investor in securities
of companies in the development  stage and acknowledges  that it is able to fend
for itself,  can bear the economic risk of its investment and has such knowledge
and  experience  in  financial  or business  matters  such that it is capable of
evaluating the merits and risks of its investment in the Common Stock.

                  3.5.  Accredited  Investor.  S&N is an  "accredited  investor"
within the meaning of SEC Rule 501 of Regulation D, as presently in effect.

                  3.6. Restricted Securities. S&N understands that the shares of
Common Stock it is  purchasing  are  characterized  as  "restricted  securities"
("Restricted Securities") under the federal securities laws inasmuch as they are
being acquired from the Company in a transaction not involving a public offering
and that under such laws and applicable  regulations  such securities may not be
resold without  registration under the Securities Act, except in certain limited
circumstances.  In this connection,  S&N represents that it is familiar with SEC
Rule 144, as presently in effect, and understands the resale limitations imposed
thereby and by the Securities Act.

                  4. Use of Proceeds.  The net proceeds  received by the Company
from the sale of the Common Stock as contemplated by this Agreement will be used
by the Company for general working capital purposes.

                  5. Transfer  Taxes.  The Company  agrees that it will pay, and
will hold S&N harmless  from, any and all liability with respect to any stamp or
similar  Taxes  which may be  determined  to be payable in  connection  with the
execution  and  delivery and  performance  of this  Agreement,  and that it will
similarly pay and hold S&N harmless from all Taxes in respect of the issuance of
the Common Stock to S&N.


                                      -8-
<PAGE>
                  6.  Expenses.  Each of the  Company  and S&N shall pay all the
costs and  expenses  incurred  by it or on its  behalf in  connection  with this
Agreement and the consummation of the transactions contemplated hereby.

                  In case any one or more of the covenants and/or agreements set
forth in this Agreement or any agreement  contemplated  by this Agreement  shall
have been  breached by any part hereto,  S&N, with respect to a breach by Exogen
may proceed to protect and enforce its rights either by suit in equity and/or by
action at law, including,  but not limited to, an action for damages as a result
of any such  breach  and/or  an  action  for  specific  performance  of any such
covenant or agreement contained in such agreement.

                  7. Miscellaneous.

                  7.1. Survival of Warranties.  The warranties,  representations
and  covenants  of the Company  and S&N  contained  in or made  pursuant to this
Agreement  shall survive the  execution  and delivery of this  Agreement and the
Closing  and shall in no way be  affected  by any  investigation  of the subject
matter thereof made by or on behalf of S&N or the Company.

                  7.2.  Successors  and Assigns.  Except as  otherwise  provided
herein, the terms and conditions of this Agreement shall inure to the benefit of
and be binding upon the  respective  successors,  permitted  assigns,  heirs and
personal  representatives of the parties (including transferees of any shares of
Common Stock sold hereunder),  except that the Company may not assign its rights
and  obligations  under this  Agreement to any person  without the prior written
consent of S&N, except in connection with a merger, consolidation or sale of all
or  substantially  all of the assets of the Company.  Nothing in this Agreement,
express or implied,  is intended to confer upon any party other than the parties
hereto  or  their  respective  successors  and  assigns  any  rights,  remedies,
obligations,  or  liabilities  under or by reason of this  Agreement,  except as
expressly provided in this Agreement.

                  7.3.  Governing  Law.  This  Agreement  shall be governed  and
construed  under  the  laws of the  State  of  Delaware  without  regard  to the
principles of conflicts or choice of law.

                  7.4.  Counterparts.  This  Agreement may be executed in two or
more counterparts,  each of which shall be deemed an original,  but all of which
together shall constitute one and the same instrument.

                  7.5.  Titles and  Subtitles.  The titles and subtitles used in
this  Agreement  are used for  convenience  only and are not to be considered in
construing or interpreting this Agreement.

                  7.6. Notices.  Unless otherwise provided,  any notice required
or permitted  under this Agreement shall be given in writing and shall be deemed
effectively  given upon  personal  delivery  to the party to be notified or upon
deposit with the United States Post Office,  by  registered  or certified  mail,
postage  prepaid  and  addressed  to the  party to be  notified  at the  address
indicated for such party on the  signature  page hereof or at such other address
as such party may  designate  by ten (10) days'  advance  written  notice to the
other party.

                                      -9-
<PAGE>
                  7.7.  Finder's Fee. Each party  represents  that it neither is
nor will be obligated for any finder's fee or commission in connection with this
transaction.  S&N agrees to indemnify  and to hold harmless the Company from any
liability  for any  commission or  compensation  in the nature of a finder's fee
(and the costs and  expenses of  defending  against  such  liability or asserted
liability) for which S&N or any of its officers,  employees,  or representatives
is responsible.

                  The Company agrees to indemnify and hold harmless S&N from any
liability  for any  commission or  compensation  in the nature of a finder's fee
(and the costs and  expenses of  defending  against  such  liability or asserted
liability)  for  which  the  Company  or  any  of  its  officers,  employees  or
representatives is responsible.

                  7.8.  Attorneys'  Fees.  If any  action at law or in equity is
necessary to enforce or interpret the terms of this  Agreement,  the  prevailing
party shall be entitled  to  reasonable  attorneys'  fees,  costs and  necessary
disbursements  in  addition  to any  other  relief  to which  such  party may be
entitled.

                  7.9.  Amendments and Waivers. No term of this Agreement may be
amended,  discharged  or  terminated  and  the  observance  of any  term of this
Agreement may not be waived  (either  generally or in a particular  instance and
either  retroactively  or  prospectively),  without the prior written consent of
S&N. Any amendment or waiver effected in accordance with this paragraph shall be
binding upon each holder of any securities purchased under this Agreement at the
time outstanding, each future holder of all such securities, and the Company. No
waiver of any of the  provisions of this  Agreement  shall be deemed to or shall
constitute a waiver of any other provision  hereof (whether or not similar).  No
delay on the part of any  party in  exercising  any  right,  power or  privilege
hereunder shall operate as a waiver thereof.

                  7.10.  Severability.   If  one  or  more  provisions  of  this
Agreement are held to be  unenforceable  under  applicable  law, such  provision
shall be excluded from this Agreement and the balance of the Agreement  shall be
interpreted  as if such  provision  were so excluded and shall be enforceable in
accordance with its terms.

                  7.11.  Entire  Agreement.  This  Agreement  and the  documents
referred to herein  constitute the entire  agreement  between the parties and no
party  shall be  liable  or  bound  to the  other  party  in any  manner  by any
warranties,  representations,  or  covenants  except as  specifically  set forth
herein or therein.

                  7.12.  Press Releases and  Announcements.  Each of the parties
hereto agrees that it will not issue any press release or announcement  relating
to the subject  matter of this Agreement  without the prior written  approval of
the  other  party;  provided,  however,  that any  party  may  make  any  public
disclosure it believes in good faith is required by law, stock exchange rules or
regulation  (in which case the  disclosing  party shall  advise the other party,
provide  it  with  a  copy  of the  proposed  disclosure  prior  to  making  the
disclosure,  and use  reasonable  efforts  to agree  upon the text of such press
release, before issuing any such press release).

                                      -10-
<PAGE>

                  IN WITNESS  WHEREOF,  the parties  have  executed  this Common
Stock Purchase Agreement as of the date first above written.



                                    EXOGEN, INC.



                                    By:    /s/ Patrick A. McBrayer
                                           -------------------------------
                                           Name:       Patrick A. McBrayer
                                           Title:      President and
                                                       Chief Executive Officer
                                           Address:    10 Constitution Avenue
                                                       P.O. Box 6860
                                                       Piscataway, NJ 08855



                                    SMITH & NEPHEW HOLDINGS, INC.



                                    By:    /s/ P. David Southworth
                                           -------------------------------
                                           Name:       P. David Southworth
                                           Title:      President
                                           Address:    1450 Brooks Road
                                                       Memphis, TN  38116









               [SIGNATURE PAGE TO COMMON STOCK PURCHASE AGREEMENT]


                                      -11-
<PAGE>
                             SCHEDULE OF EXCEPTIONS
                                       TO
                              COMMON STOCK PURCHASE
                           AGREEMENT (THE "AGREEMENT")
                                 BY AND BETWEEN
                           EXOGEN INC. (THE "COMPANY")
                                       AND
                      SMITH & NEPHEW HOLDINGS, INC. ("S&N")



                  CAPITALIZED  TERMS USED HEREIN WHICH ARE NOT OTHERWISE DEFINED
SHALL HAVE THE RESPECTIVE MEANINGS ASCRIBED TO SUCH TERMS IN THE AGREEMENT.

                  DISCLOSURE UNDER ANY SECTION SHALL CONSTITUTE DISCLOSURE UNDER
THE  SCHEDULE  OF  EXCEPTIONS  WITHOUT  THE  NEED  FOR   CROSS-REFERENCES.   ALL
DESCRIPTIONS  OF  AGREEMENTS OR OTHER  MATTERS  APPEARING  HEREIN ARE SUMMARY IN
NATURE AND ARE QUALIFIED BY REFERENCE TO THE COMPLETE DOCUMENTS, WHICH HAVE BEEN
SUPPLIED TO S&N OR WHICH THE COMPANY WILL MAKE AVAILABLE TO S&N UPON REQUEST. IN
NO  EVENT  SHALL  ANY   DISCLOSURE   HEREUNDER  BE  DEEMED  TO   CONSTITUTE   AN
ACKNOWLEDGEMENT  THAT SUCH  DISCLOSURE  IS MATERIAL TO THE BUSINESS OR FINANCIAL
CONDITION OF THE COMPANY.

                  THE   REPRESENTATIONS,   WARRANTIES,   COVENANTS   AND   OTHER
OBLIGATIONS  AND AGREEMENTS OF THE COMPANY IN THE AGREEMENT ARE MADE,  GIVEN AND
UNDERTAKEN  SUBJECT TO THE  DISCLOSURES  IN THIS SCHEDULE OF  EXCEPTIONS  AND AS
PROVIDED IN THIS AGREEMENT.


                                       i
<PAGE>
                                 SCHEDULE 1.3(b)


                  Delaware
                  New Jersey



                                       ii
<PAGE>


                                  SCHEDULE 2.3



                  On  September  8, 1997,  the Company  and  [****],  a Delaware
corporation  ("[****]"),  entered into an advisory  agreement pursuant to which,
the Company  issued to [****],  for an aggregate  purchase  price of $20,000,  a
warrant to purchase up to 100,000  shares of the  Company's  Common  Stock at an
exercise price equal to $4.50 per share (the "Purchase  Warrant").  The Purchase
Warrant is  exercisable  until (i) September 8, 2002 or (ii) November 1, 1998 in
the event that the Company  does not, by July 31,  1998,  consummate a strategic
partnering  transaction  relating  to the  commercialization  of  certain of the
Company's technologies (a "Strategic Partnering  Transaction").  Further, if the
Company consummates Strategic Partnering  Transactions with companies introduced
by [****] for three specific technologies,  [****] will be entitled to a warrant
to purchase  75,000  shares of the Company's  Common Stock at an exercise  price
equal to $4.50  per share  (the  "Transaction  Warrants")  for each of the three
transactions;  provided,  however, that for any Strategic Partnering Transaction
consummated  prior to July 31,  1998,  [****]  will be  entitled to a warrant to
purchase 125,000 shares of the Company's Common Stock instead of 100,000 shares.
Such Transaction Warrants shall expire five (5) years from the date of issuance.


























- ---------------
         [****]  REPRESENTS  MATERIAL  WHICH  HAS BEEN  REDACTED  PURSUANT  TO A
REQUEST FOR CONFIDENTIAL  TREATMENT  PURSUANT TO RULE 24B-2 UNDER THE SECURITIES
EXCHANGE ACT OF 1934, AS AMENDED.

                                      iii
<PAGE>


                                  SCHEDULE 2.5 



                  There are no exceptions.







                                       iv
<PAGE>




                                  SCHEDULE 2.6



                  Reference  is made to the  information  contained  in Part II,
Item 1 of the  Company's  Quarterly  Report on Form 10-Q for the  Quarter  Ended
March 31, 1998. The hearings on pending  motions in both the litigation  matters
described have been  adjourned,  pending  settlement  negotiations  which are in
process. There can be no assurance that a settlement will be finalized, in which
event the litigation would continue.


                                       v
<PAGE>


                                  SCHEDULE 2.11



                  See Schedule 8 to Master  Agreement  between Exogen,  Inc. and
Smith & Nephew, Inc. dated as of August 10, 1998.


                                       vi
<PAGE>
                                  SCHEDULE 2.13



                  There are no exceptions.




                                      vii
<PAGE>
                                                                         ANNEX A










                                  EXOGEN, INC.



                          REGISTRATION RIGHTS AGREEMENT



                                 August 10, 1998


<PAGE>
                                TABLE OF CONTENTS

1.       Registration Rights.............................................1
           1.1.   Definitions............................................1
           1.2.   Shelf Registration.....................................2
           1.3.   Company Registration...................................4
           1.4.   Obligations of the Company.............................4
           1.5.   Furnish Information....................................7
           1.6.   Expenses of Registration...............................7
           1.7.   Expenses of Company Registration.......................8
           1.8.   Underwriting Requirements..............................8
           1.9.   Delay of Registration..................................9
           1.10.  Indemnification........................................9
           1.11.  Reports Under Securities Exchange Act of 1934.........12
           1.12.  Assignment of Registration Rights.....................12
           1.13.  Limitations on Subsequent Registration Rights.........13
           1.14.  "Market Stand-Off Agreement"..........................13
           1.15.  No Required Sale......................................14

2.       Miscellaneous..................................................14
           2.1.   Successors and Assigns................................14
           2.2.   Governing Law.........................................14
           2.3.   Counterparts..........................................14
           2.4.   Titles and Subtitles..................................14
           2.5.   Notices...............................................14
           2.6.   Expenses..............................................14
           2.7.   Amendments and Waivers................................14
           2.8.   Severability..........................................15
           2.9.   Nominees for Beneficial Owners........................15
           2.10.  Specific Performance..................................15
           2.11.  No Inconsistent Agreements............................15
           2.12.  Entire Agreement......................................16


<PAGE>
                          REGISTRATION RIGHTS AGREEMENT


                  THIS REGISTRATION  RIGHTS AGREEMENT is made as of the 10th day
of  August,  1998 by and  between  Exogen,  Inc.,  a Delaware  corporation  (the
"Company"), and Smith & Nephew Holdings, Inc., a Delaware corporation ("S&N").


                                    RECITALS


                  WHEREAS,  the Company and S&N are parties to the Common  Stock
Purchase Agreement of even date herewith (the "Stock Purchase Agreement");


                  WHEREAS,  in order to induce  the  Company  to enter  into the
Stock  Purchase  Agreement  and to  induce  S&N to invest  funds in the  Company
pursuant to the Stock Purchase Agreement,  S&N and the Company hereby agree that
this  Agreement  shall govern the rights of S&N to cause the Company to register
shares of Common Stock  issuable to S&N and certain  other  matters as set forth
herein;


                  NOW, THEREFORE, THE PARTIES HEREBY AGREE AS FOLLOWS:

                  1.  Registration  Rights.  The Company covenants and agrees as
follows:

                  1.1. Definitions. For purposes of this Section 1:


                      (a) The term "Act" means the  Securities  Act of 1933,  as
amended.

                      (b) The term "register,"  "registered," and "registration"
refer  to a  registration  effected  by  preparing  and  filing  a  registration
statement or similar  document in compliance with the Securities Act of 1933, as
amended (the "Act"),  and the declaration or ordering of  effectiveness  of such
registration statement or document;

                      (c) The term "Registrable Securities" means (1) the Common
Stock issued  pursuant to the Stock Purchase  Agreement and (2) any Common Stock
of the Company  issued as (or issuable  upon the  conversion  or exercise of any
warrant,  right or  other  security  which is  issued  as) a  dividend  or other
distribution  with  respect to, or in exchange  for or in  replacement  of, such
Common Stock,  excluding in all cases, however, any Registrable Securities which
are sold, assigned,  pledged,  hypothecated or otherwise disposed of by S&N in a
transaction  in which S&N's  rights  under this  Agreement  are not  assigned or
assignable;

                      (d) The number of shares of  "Registrable  Securities then
outstanding"  shall be  determined  by the  number of  shares  of  Common  Stock
outstanding  which  are,  and the
<PAGE>
number of shares  of Common  Stock  issuable  pursuant  to then  exercisable  or
convertible  securities  which  are,  Registrable  Securities;  and 

                      (e) The term "Holder"  means S&N and any  transferees  and
assignees permitted by Section 1.12.

                  1.2. Shelf Registration.

                      (a)  The  Company  shall,   subject  to  the   limitations
specified  in  this  Agreement,  use  its  best  efforts  (i) to  file  a  shelf
registration  statement  on Form S-3 or any other form  available to the Company
within  ninety (90) days from the date hereof (the "Filing  Date")  covering the
registration under the Act of all Registrable  Securities then outstanding to be
offered or sold on a delayed or continuous  basis as provided by this Agreement,
pursuant to Rule 415 of the Act (the "Shelf Registration  Statement");  and (ii)
to maintain the effectiveness of the Shelf  Registration  Statement for a period
of two (2) years  from the date of this  Agreement  (or such  shorter  period in
accordance with Section 1.4(a)).

                      (b) If any  offering  pursuant  to Section  1.2(a)  hereof
involves  an  underwritten  offering,  an  underwriter  will be  selected by the
Holders of two-thirds of the Registrable  Securities then  outstanding and shall
be reasonably  acceptable to the Company. In such event, the right of any Holder
to include its Registrable  Securities in such registration shall be conditioned
upon such Holder's  participation in such underwriting and the inclusion of such
Holder's  Registrable  Securities  in the  underwriting  to the extent  provided
herein. All Holders proposing to distribute  Registrable Securities through such
underwriting  shall  (together  with the Company as provided in Section  1.4(e))
enter into an  underwriting  agreement in customary form with the underwriter or
underwriters selected for such underwriting. Notwithstanding any other provision
of this  Section  1.2, if the  underwriter  advises the Holders in writing  that
marketing   factors  require  a  limitation  of  the  number  of  shares  to  be
underwritten,  then the number of shares of Registrable  Securities  that may be
included in the  underwriting  shall be allocated  among all Holders  thereof in
proportion (as nearly as practicable) to the amount of Registrable Securities of
the Company owned by each Holder;  provided,  however, that the number of shares
of  Registrable  Securities  to be  included in such  underwriting  shall not be
reduced  unless all Other  Securities  (as  defined  below)  are first  entirely
excluded from the underwriting.

                      (c)  Notwithstanding  the foregoing,  if the Company shall
furnish to the Holders a certificate  signed by the Chief  Executive  officer or
President of the Company  stating that, in the good faith  judgment of the Board
of Directors of the Company,  it would be seriously  detrimental (a "Detrimental
Condition") to the Company and its stockholders for a registration  statement to
be filed or to become or remain effective, as the case may be, and provided that
the  Detrimental  Condition  has not resulted from actions taken by the Company,
(i) the Company  shall have the right to defer taking action with respect to the
filing of the Shelf Registration  Statement for a period of not more than ninety
(90) days after the Filing Date, (ii) in case a Shelf Registration Statement has
been filed but has not become effective, the Company may cause such registration
statement  to be  withdrawn  or may  postpone  amending  or  supplementing  such
registration statement until such Detrimental Condition no longer exists, but in
no event for more than ninety (90) days,  or (iii) in case a Shelf  Registration
Statement  has been filed and has become  effective,  the Company may cause such
registration  statement to be withdrawn and its effectiveness  terminated or may
postpone  amending  or  supplementing  such  registration  statement  until such
Detrimental  Condition  no longer  exists,  but in no event for more


                                       2
<PAGE>
than ninety (90) days. The Company may not declare a Detrimental  Condition,  or
take any of the actions specified in clauses (i), (ii) or (iii) of the preceding
sentence  (and can take only one such action  specified in  clauses(i),  (ii) or
(iii) per Detrimental Condition), more than once in any twelve-month period. The
Company shall give written notice of its determination to postpone or withdraw a
registration  statement and of the fact that the Detrimental  Condition for such
postponement  or withdrawal no longer exists,  in each case,  promptly after the
occurrence  thereof.  The following  events or  circumstances  may result in the
filing of a registration  statement being  seriously  detrimental to the Company
and its shareholders: a pending material acquisition, merger or sale or purchase
of assets,  pending or  threatened  material  litigation,  pending or threatened
material  regulatory or  governmental  action,  pending  material  change in the
business,  prospects,  condition  (financial  or  other)  or  properties  of the
Company.  The foregoing list is for illustrative  purposes only and is not meant
to be exclusive.

                      (d) If the Company  shall give any notice of  postponement
or withdrawal of any registration  statement,  the Company shall not, during the
period of postponement  or withdrawal  pursuant to clauses (i), (ii) or (iii) of
the prior  paragraph,  register  any  Common  Stock,  other than  pursuant  to a
registration  statement on Form S-4 or S-8 (or an equivalent  registration  form
then in effect). Each Holder of Registrable Securities agrees that, upon receipt
of any notice from the Company that the Company has  determined  to withdraw any
registration  statement pursuant to the immediately  preceding  paragraph,  such
Holder will  discontinue its disposition of Registrable  Securities  pursuant to
such registration  statement and, if so directed by the Company, will deliver to
the Company (at the Company's  expense) all copies,  other than  permanent  file
copies,  then  in such  Holder's  possession  of the  prospectus  covering  such
Registrable Securities that was in effect at the time of receipt of such notice.
If the Company shall have  withdrawn or  prematurely  terminated a  registration
statement  filed under this  Section 1.2  (whether  pursuant to the  immediately
preceding paragraph, or as a result of any stop order, injunction or other order
or  requirement  of the SEC or any  other  governmental  agency or  court),  the
Company shall not be considered to have effected an effective  registration  for
the  purposes  of this  Agreement  until  the  Company  shall  have  filed a new
registration  statement  covering  the  Registrable  Securities  covered  by the
withdrawn registration statement and such registration statement shall have been
declared effective and shall not have been withdrawn.  If the Company shall give
any notice of  withdrawal  or  postponement  of a  registration  statement,  the
Company  shall,  at such time as the  Detrimental  Condition  that  caused  such
withdrawal or  postponement  no longer exists (but in no event later than ninety
(90)  days  after  the date of the  postponement  or  withdrawal),  use its best
efforts to effect the  registration  under the Securities Act of the Registrable
Securities  covered by the  withdrawn  or  postponed  registration  statement in
accordance  with this Section 1.2 (unless the Holder shall have  withdrawn  such
request,  in which case the Company  shall not be considered to have effected an
effective registration for the purposes of this Agreement).


                                       3
<PAGE>
                      (e) The  registration  statement  filed  pursuant  to this
Section 1.2 may include  other  securities  of the Company (i) which are held by
persons who, by virtue of agreements  with the Company,  are entitled to include
their securities in any such  registration,  (ii) which are held by officers and
directors  of the Company,  or (iii) which are being  offered for the account of
the Company  (collectively,  the securities referred to in clauses (i), (ii) and
(iii) in this paragraph are hereinafter referred to as the "Other Securities").

                  1.3. Company  Registration.  If (but without any obligation to
do  so)  the  Company  proposes  to  register  (including  for  this  purpose  a
registration  effected by the Company for  stockholders  other than the Holders)
any of its stock or other securities under the Act in connection with the public
offering of such securities solely for cash (other than a registration  relating
solely to the sale of  securities  to  participants  in a Company  stock option,
stock purchase or similar plan or a SEC Rule 145 transaction,  a registration on
any form which does not include  substantially  the same information as would be
required to be included in a  registration  statement  covering  the sale of the
Registrable  Securities or a  registration  in which the only Common Stock being
registered is Common Stock issuable upon  conversion of debt securities that are
also being  registered),  the Company  shall,  at such time,  promptly give each
Holder written  notice of such  registration.  Upon the written  request of each
Holder given within twenty (20) days after mailing of such notice by the Company
in accordance with Section 2.5, the Company shall,  subject to the provisions of
Section  1.8,  cause  to be  registered  under  the Act  all of the  Registrable
Securities that each such Holder has requested to be registered. No registration
effected  pursuant  to  this  Section  1.3  shall  relieve  the  Company  of its
obligations  to effect the  required  registration  pursuant to Section 1.2. Any
Holder  shall  have the right to  withdraw  his  request  for  inclusion  of its
Registrable  Securities in any registration  statement  pursuant to this Section
1.3 by giving written notice to the Company of its request to withdraw.

                  1.4.  Obligations  of the Company.  When  required  under this
Section 1 to effect the registration of the Registrable Securities,  the Company
shall, as expeditiously as reasonably possible:


                      (a)  Prepare  and file with the  Securities  and  Exchange
Commission  (the "SEC") a Shelf  Registration  Statement or, if applicable,  any
other form of  registration  statement,  as the case may be, with respect to the
Registrable  Securities  and use its best  efforts  to cause  such  registration
statement to become  effective  within one hundred  twenty (120) days after such
registration  statement was filed and to keep such Shelf Registration  Statement
effective for a period up to the second  anniversary of the date hereof or until
the  distribution  contemplated  in the Shelf  Registration  Statement  has been
completed;  provided,  however,  that before filing a registration  statement or
prospectus or any amendments or supplements  thereto,  or comparable  statements
under securities or blue sky laws of any jurisdiction,  the Company will furnish
to one counsel for the Holders (the  "Holders'  Counsel")  participating  in the
planned  offering  (selected  by the Holders of  two-thirds  of the  Registrable
Securities   then   outstanding   included  in  such   registration),   and  the
underwriters,  if  any,  copies  of all  such  documents  proposed  to be  filed
(including  all  exhibits  thereto),  which  documents  will be  subject  to the
reasonable review and reasonable comment of such counsel.


                                       4
<PAGE>
                      (b)  Prepare  and file  with the SEC such  amendments  and
supplements to such registration statement and the prospectus used in connection
with  such  registration  statement  as may be  necessary  to  comply  with  the
provisions of the Act with respect to the disposition of all securities  covered
by such registration statement.

                      (c) Furnish to the Holders  whose  Registrable  Securities
are  covered by the Shelf  Registration  Statement  such  numbers of copies of a
prospectus,   including  a  preliminary  prospectus,   in  conformity  with  the
requirements of the Act, and such other documents as they may reasonably request
in order to facilitate the disposition of Registrable Securities owned by them.

                      (d) Use its best  efforts  to  register  and  qualify  the
securities covered by such registration statement under such other securities or
blue sky laws of such  jurisdictions  as shall be  reasonably  requested  by the
Holders  whose  Registrable  Securities  are  covered by the Shelf  Registration
Statement;  provided  that the  Company  shall  not be  required  in  connection
therewith  or as a  condition  thereto to qualify  to do  business  or to file a
general consent to service of process in any such states or jurisdictions unless
the Company is already subject to service in such jurisdiction.

                      (e) In the event the Registrable Securities are to be sold
through an underwritten public offering,  enter into and perform its obligations
under an underwriting  agreement, in usual and customary form, with the managing
underwriter of such offering.  The Holders  proposing to distribute  Registrable
Securities  through such underwritten  public offering shall also enter into and
perform their obligations under such an agreement.

                      (f) In the event the Registrable Securities are to be sold
through an underwritten public offering, use its best efforts to furnish, on the
date that such Registrable Securities are delivered to the underwriters for sale
in connection  with a  registration  pursuant to this Section 1, (i) an opinion,
dated such date,  of the counsel  representing  the Company for the  purposes of
such registration, in form and substance as is customarily given to underwriters
in an underwritten  public offering,  addressed to the underwriters,  and (ii) a
letter,  dated such date, from the independent  certified public  accountants of
the Company  addressed to the  underwriters,  stating that such  accountants are
independent  public accountants within the meaning of the Act and the applicable
published  rules  and  regulations  thereunder,  and  otherwise  in form  and in
substance as is customarily given by independent certified public accountants to
underwriters in connection with an underwritten public offering.

                      (g) Promptly  notify (i) each Holder  selling  Registrable
Securities covered by such registration statement and each managing underwriter,
if any: (A) when the  registration  statement,  the prospectus or any prospectus
supplement  related  thereto or  post-effective  amendment  to the  registration
statement has been filed and, with respect to the registration  statement or any
post-effective  amendment,  when  the  same  has  become  effective,  (B) of the
issuance  by the SEC of any  stop  order  suspending  the  effectiveness  of the
registration  statement or the initiation of any  proceedings  for that purpose,
(C) of the  receipt  by the  Company  of any  notification  with  respect to the
suspension of the qualification of any Registrable

                                       5
<PAGE>
Securities for sale under the securities or blue sky laws of any jurisdiction or
the  initiation of any  proceeding  for such purpose,  and (D) when a prospectus
relating to the registration statement is required to be delivered under the Act
of the  happening of any event as a result of which the  prospectus  included in
such registration  statement, as then in effect, includes an untrue statement of
a material fact or omits to state a material fact required to be stated  therein
or necessary to make the  statements  therein not misleading in the light of the
circumstances  then  existing;  and (ii)  Holders'  Counsel  and  each  managing
underwriter  of any request by the SEC for  amendments  or  supplements  to such
registration   statement  or  prospectus   related  thereto  or  for  additional
information. If the notification relates to an event described in clause (i)(D),
the Company  shall,  in  accordance  with  paragraph  (b) of this  Section  1.4,
promptly  prepare  and  furnish to each Holder  selling  Registrable  Securities
covered by such registration statement and each managing underwriter,  if any, a
reasonable number of copies of a prospectus  supplemented or amended so that, as
thereafter  delivered to the  purchasers of such  Registrable  Securities,  such
prospectus  shall not include an untrue  statement of a material fact or omit to
state a material  fact  required to be stated  therein or  necessary to make the
statements therein in the light of the circumstances  under which they were made
not misleading.

                      (h)  Cooperate  with the  selling  Holders of  Registrable
Securities  and the  managing  underwriter,  if any,  to  facilitate  the timely
preparation  and delivery of certificates  not bearing any  restrictive  legends
representing  the Registrable  Securities to be sold, and cause such Registrable
Securities to be issued in such  denominations  and  registered in such names in
accordance  with the  underwriting  agreement  prior to any sale of  Registrable
Securities  to  the  underwriters  or,  if  not  an  underwritten  offering,  in
accordance  with  the   instructions  of  the  selling  Holders  of  Registrable
Securities  at least  three  business  days  prior  to any  sale of  Registrable
Securities  and  instruct  any  transfer  agent  and  registrar  of  Registrable
Securities to release any stop transfer  orders in respect  thereto  Comply with
all applicable rules and regulations of the SEC, and make generally available to
its security holders, as soon as reasonably practicable after the effective date
of the registration statement (and in any event within 16 months thereafter), an
earnings  statement (which need not be audited)  covering the period of at least
twelve  consecutive  months  beginning with the first day of the Company's first
calendar quarter after the effective date of the registration  statement,  which
earnings  statement shall satisfy the provisions of Section 11(a) of the Act and
Rule 158 thereunder.

                      (i) Cause all such Registrable  Securities covered by such
registration  statement  to be listed on the  principal  securities  exchange on
which similar  securities issued by the Company are then listed (if any), if the
listing of such Registrable Securities is then permitted under the rules of such
exchange,  or (ii) if no similar  securities are then so listed, to either cause
all such Registrable  Securities to be listed on a national  securities exchange
or to  secure  designation  of all such  Registrable  Securities  as a  National
Association of Securities  Dealers,  Inc. Automated  Quotation System ("NASDAQ")
"national market system security" within the meaning of Rule 11Aa2-1 of the 1934
Act (as defined below) or, failing that,  secure NASDAQ  authorization  for such
shares and, without  limiting the generality of the foregoing,  take all actions
that may be required by the Company as the issuer of such Registrable Securities
in order to facilitate the managing underwriter's arranging for the registration
of at least two market

                                       6
<PAGE>
makers as such with  respect to such shares  with the  National  Association  of
Securities Dealers, Inc. (the "NASD").

                      (j) Provide and cause to be  maintained  a transfer  agent
and registrar for all such Registrable  Securities  covered by such registration
statement not later than the effective date of such registration statement.

                      (k)  Deliver   promptly  to  Holders'   Counsel  and  each
underwriter,  if  any,  copies  of all  correspondence  between  the SEC and the
Company,  its counsel or auditors and all memoranda relating to discussions with
the SEC or its staff with  respect  to the  registration  statement,  other than
those  portions  of any such  memoranda  which  contain  information  subject to
attorney-client privilege with respect to the Company, and, upon receipt of such
confidentiality   agreements  as  the  Company  may  reasonably  request,   make
reasonably available for inspection by Holders' Counsel, by any underwriter,  if
any,   participating  in  any  disposition  to  be  effected  pursuant  to  such
registration  statement and any attorney,  accountant or other agent retained by
any such  underwriter,  all  pertinent  financial and other  records,  pertinent
corporate  documents  and  properties  of  the  Company,  and  cause  all of the
Company's officers, directors and employees to supply all information reasonably
requested by Holders' Counsel or such underwriter, attorney, accountant or agent
in connection with such registration statement.

                      (l) Use  reasonable  best efforts to obtain the withdrawal
of any order suspending the effectiveness of the registration statement.

                      (m)  Upon   written   request,   furnish  to  each  Holder
participating in the offering and the managing  underwriter,  without charge, at
least one conformed copy of the  registration  statement and any  post-effective
amendments thereto,  including financial statements and schedules, all documents
incorporated therein by reference and all exhibits (including those incorporated
by reference).

                      (n) Take all such other commercially reasonable actions as
are necessary or advisable in order to expedite or facilitate the disposition of
such Registrable Securities.

                  1.5. Furnish Information. It shall be a condition precedent to
the  obligations  of the Company to take any action  pursuant to this  Section 1
with respect to the  Registrable  Securities  of the Holders  whose  Registrable
Securities  are covered by the Shelf  Registration  Statement  that each of such
Holders  shall furnish to the Company such  information  regarding  itself,  the
Registrable  Securities  held by it, and the intended  method of  disposition of
such securities as shall be required to effect the registration of such Holders,
Registrable Securities.

                  1.6. Expenses of Registration.


                      (a)  "Expenses"  shall mean any and all fees and  expenses
incident to the  Company's  performance  of or  compliance  with this Section 1,
including,  without limitation: (i) SEC, stock exchange or NASD registration and
filing fees and all listing fees and fees


                                       7
<PAGE>
with respect to the inclusion of securities in NASDAQ, (ii) fees and expenses of
compliance  with state  securities or "blue sky" laws and in connection with the
preparation of a "blue sky" survey,  including  without  limitation,  reasonable
fees and expenses of blue sky counsel, (iii) printing and copying expenses, (iv)
messenger and delivery  expenses,  (v) expenses  incurred in connection with any
road show, (vi) fees and  disbursements  of counsel for the Company,  (vii) with
respect to each registration,  the fees and disbursements of one counsel for the
selling  Holder(s)  (selected by the Holders of  two-thirds  of the  Registrable
Securities  then  outstanding  included in such  registration),  (viii) fees and
disbursements of the Company's  independent  public  accountants  (including the
expenses of any audit  and/or  "cold  comfort"  letter) and fees and expenses of
other persons, including special experts, retained by the Company, (ix) any fees
and expenses  payable to a Qualified  Independent  Underwriter  (as such term is
defined in Conduct  Rule 2720 of the NASD's  By-Laws) and (x) any other fees and
disbursements of underwriters, if any, customarily paid by issuers or sellers of
securities.

                      (b) The Company shall pay all Expenses with respect to any
registration pursuant to Section 1.2, whether or not such registration statement
becomes  effective or remains  effective for the period  contemplated by Section
1.2(a).

                      (c) Notwithstanding  the foregoing,  (i) the provisions of
this Section 1.6 shall be deemed amended to the extent  necessary to cause these
expense  provisions  to comply  with  "blue sky" laws of each state in which the
offering is made and (ii) in connection with any  registration  hereunder,  each
Holder of Registrable  Securities  being  registered  shall pay all underwriting
discounts and commissions  and any transfer  taxes, if any,  attributable to the
sale of such  Registrable  Securities,  pro rata with  respect  to  payments  of
discounts and  commissions  in accordance  with the number of shares sold in the
offering  by such  Holder,  and  (iii)  the  Company  shall,  in the case of all
registrations under this Section 1, be responsible for all its internal expenses
(including,  without  limitation,  all salaries and expenses of its officers and
employees performing legal or accounting duties).

                  1.7. Expenses of Company Registration.  The Company shall bear
and pay all Expenses  incurred in  connection  with any  registration  filing or
qualification  of  Registrable  Securities  with  respect  to the  registrations
pursuant to Section 1.3 for each Holder (which right may be assigned as provided
in Section 1.12), but excluding  underwriting discounts and commissions relating
to Registrable Securities.

                      1.8.  Underwriting  Requirements.  In connection  with any
offering involving an underwriting of shares of the Company's capital stock, the
Company  shall not be required  under Section 1.3 to include any of the Holders'
securities in such underwriting unless they accept the terms of the underwriting
as agreed upon  between the Company and the  underwriters  selected by it (or by
other  persons  entitled  to  select  the  underwriters),  and then only in such
quantity  as the  underwriters  determine  in  their  sole  discretion  will not
jeopardize  the success of the offering by the  Company.  If the total amount of
securities,  including Registrable  Securities,  requested by stockholders to be
included in such offering  exceeds the amount of  securities  sold other than by
the  Company  that the  underwriters  determine  in  their  sole  discretion  is
compatible

 
                                       8
<PAGE>
with the success of the offering,  then the Company shall be required to include
in the  offering  only that  number of such  securities,  including  Registrable
Securities,  that the  underwriters  determine in their sole discretion will not
jeopardize  the  success of the  offering  (the  securities  so  included  to be
apportioned  pro rata  among the  selling  stockholders  according  to the total
amount of  securities  entitled to be  included  therein  owned by each  selling
stockholder or in such other  proportions as shall mutually be agreed to by such
selling  stockholders,  but in any event subject to the apportionment  rights of
certain  selling  stockholders  under  Section  1.8 of the  Registration  Rights
Agreement,  dated October 20, 1997, between the Company and certain stockholders
of  the  Company).  For  purposes  of  the  preceding  parenthetical  concerning
apportionment,  for any  selling  stockholder  that is a Holder  of  Registrable
Securities and that is a partnership or corporation, corporate partners, retired
partners and  stockholders of such Holder,  or the estates and family members of
any such partners and retired  partners and any trusts for the benefit of any of
the foregoing persons shall be deemed to be a single "selling  stockholder," and
any pro-rata reduction with respect to such "selling stockholder" shall be based
upon the aggregate  amount of shares carrying  registration  rights owned by all
entities and individuals  included in such "selling  stockholder," as defined in
this sentence.

                  1.9.  Delay of  Registration.  The Holders  shall not have any
right to obtain or seek an injunction restraining or otherwise delaying any such
registration as the result of any  controversy  that might arise with respect to
the interpretation or implementation of this Section 1.

                  1.10. Indemnification. In the event any Registrable Securities
are included in a registration statement under this Section 1:

                      (a) To the  extent  permitted  by law,  the  Company  will
indemnify and hold harmless the Holder whose Registrable  Securities are covered
by the Registration Statement, its directors, officers,  fiduciaries,  employees
and  stockholders or general or limited  partners (and the directors,  officers,
employees and stockholders thereof), any underwriter (as defined in the Act) for
such Holders and each person,  if any, who controls such Holders or  underwriter
within the meaning of the Act or the Securities Exchange Act of 1934, as amended
(the "1934 Act"), each officer,  director,  employee,  stockholder or partner of
such underwriter,  against any losses, claims, damages, or liabilities (joint or
several)  or  actions or  proceedings  (whether  commenced  or  threatened)  and
expenses  (including  reasonable  fees of counsel  and any  amounts  paid in any
settlement  effected  with the  Company's  consent),  to which  they may  become
subject under the Act, the 1934 Act or any state securities law, insofar as such
losses,  claims,  damages,  or liabilities (or actions or proceedings in respect
thereof)  ("Claims")  or  expenses  arise  out of or are  based  upon any of the
following statements,  omissions or violations (collectively a "Violation"): (i)
any untrue statement or alleged untrue statement of a material fact contained in
such  registration  statement,  including any  preliminary  prospectus,  summary
prospectus  or  final  prospectus   contained   therein  or  any  amendments  or
supplements thereto,  together with documents incorporated by reference therein,
(ii) the omission or alleged  omission to state therein a material fact required
to  be  stated  therein,  or  necessary  to  make  the  statements  therein  not
misleading,  or (iii) any  violation or alleged  violation by the Company of the
Act, the


                                       9
<PAGE>
1934 Act, any state securities law or any rule or regulation  promulgated  under
the Act, the 1934 Act or any state  securities  law; and the Company will pay to
such Holders, and each such underwriter or controlling person any legal or other
expenses  reasonably  incurred  by  them in  connection  with  investigating  or
defending  any such  loss,  claim,  damage,  liability,  expense  or  action  or
proceeding;  provided,  however,  that (A) the indemnity  agreement contained in
this  Section  1.10 shall not apply to amounts  paid in  settlement  of any such
Claim if such  settlement is effected  without the consent of the Company (which
consent shall not be unreasonably withheld), (B) the Company shall not be liable
in any case for any such Claim to the  extent  that it arises out of or is based
upon a Violation  which occurs in reliance upon and in  conformity  with written
information  furnished expressly for use in connection with such registration by
any such Holders,  or any such underwriter or controlling person. Such indemnity
and  reimbursement of expenses shall remain in full force and effect  regardless
of any  investigation  made by as on behalf of such indemnified  party and shall
survive the transfer of such securities by such Holder.

                      (b) To the extent  permitted  by law,  each  Holder  whose
Registrable  Securities are covered by the Shelf  Registration  Statement  will,
severally and not jointly,  indemnify and hold harmless the Company, each of its
directors,  each of its officers who has signed the registration statement, each
person,  if any,  who  controls  the Company  within the meaning of the Act, any
underwriter,  and any controlling  person of any such  underwriter,  against any
losses,  claims,  damages, or liabilities (joint or several) to which any of the
foregoing persons may become subject, under the Act, or the 1934 Act, insofar as
such Claim  arises out of or is based  upon any  Violation,  in each case to the
extent (and only to the extent) that such Violation  occurs in reliance upon and
in conformity with written  information  furnished by such Holder  expressly for
use in connection with such registration; and such Holder will pay, as incurred,
any legal or other  expenses  reasonably  incurred by any person  intended to be
indemnified  pursuant to this Section 1.10, in connection with  investigating or
defending  any such  Claim;  provided,  however,  that the  indemnity  agreement
contained in this Section 1.10 shall not apply to amounts paid in  settlement of
any such  Claim if such  settlement  is  effected  without  the  consent of such
Holder, which consent shall not be unreasonably  withheld;  provided that, in no
event shall any  indemnity  under this Section 1.10 exceed the net proceeds from
the offering  received by such  Holder.  Such  indemnity  and  reimbursement  of
expenses shall remain in full force and effect  regardless of any  investigation
made by as on behalf of such indemnified party and shall survive the transfer of
such securities by such Holder.

                      (c) Promptly after receipt by an  indemnified  party under
this Section 1.10 of notice of the  commencement  of any action  (including  any
governmental action), such indemnified party will, if a claim in respect thereof
is to be made against any indemnifying party under this Section 1.10, deliver to
the  indemnifying  party a written  notice of the  commencement  thereof and the
indemnifying  party shall have the right to  participate  in, and, to the extent
the indemnifying  party so desires,  jointly with any other  indemnifying  party
similarly  noticed,   to  assume  the  defense  thereof  with  counsel  mutually
satisfactory  to the  parties;  provided,  however,  that an  indemnified  party
(together with all other  indemnified  parties which may be represented  without
conflict by one counsel)  shall have the right to retain one  separate  counsel,
with  the  fees  and  expenses  to be paid  by the  indemnifying  party,  (i) if
representation  of  such  indemnified  party

                                       10
<PAGE>
by the counsel retained by the indemnifying  party would be inappropriate due to
actual or potential  differing  interests between such indemnified party and any
other  party  represented  by  such  counsel  in  such  proceeding;  (ii) if the
indemnifying party fails to take reasonable steps necessary to defend diligently
the  action  or  proceeding  within 30 days  after  receiving  notice  from such
indemnified  party; or (iii) if such indemnified party who is a defendant in any
action or  proceeding  which is also  brought  against  the  indemnifying  party
reasonably  shall have  concluded  that there may be one or more legal  defenses
available to such indemnified  party which are not available to the indemnifying
party. The failure to deliver written notice to the indemnifying  party within a
reasonable time of the  commencement  of any such action,  if prejudicial to its
ability to defend such  action,  shall  relieve such  indemnifying  party of any
liability to the indemnified  party under this Section 1.10, but the omission so
to deliver written notice to the  indemnifying  party will not relieve it of any
liability that it may have to any  indemnified  party  otherwise than under this
Section 1.10.

                      (d) If the  indemnification  provided  for in this Section
1.10 is held  by a court  of  competent  jurisdiction  to be  unavailable  to an
indemnified party with respect to any Claim or expense referred to therein, then
the  indemnifying   party,  in  lieu  of  indemnifying  such  indemnified  party
hereunder,  shall  contribute to the amount paid or payable by such  indemnified
party as a result of such Claim or expense in such  proportion as is appropriate
to reflect the relative fault of the  indemnifying  party on the one hand and of
the  indemnified  party  on the  other in  connection  with  the  statements  or
omissions  that resulted in such Claim or expense as well as any other  relevant
equitable  considerations.  The relative fault of the indemnifying  party and of
the  indemnified  party shall be determined by reference to, among other things,
whether  the  untrue or  alleged  untrue  statement  of a  material  fact or the
omission  to state a  material  fact  relates  to  information  supplied  by the
indemnifying party or by the indemnified party and the parties, relative intent,
knowledge,  access to  information,  and  opportunity to correct or prevent such
statement  or  omission.  If,  however,  the  allocation  provided  in the first
sentence  of this  paragraph  is not  permitted  by  applicable  law,  then each
indemnifying  party  shall  contribute  to the  amount  paid or  payable by such
indemnified  party in such proportion as is appropriate to reflect not only such
relative faults but also the relative benefits of the indemnifying party and the
indemnified party as well as any other relevant  equitable  considerations.  The
parties  hereto agree that it would not be just and  equitable if  contributions
pursuant to this Section 1.10(d) were to be determined by pro rata allocation or
by any other method of  allocation  which does not take account of the equitable
considerations  referred to in the preceding  sentences of this Section 1.10(d).
The amount  paid or  payable in respect of any Claim  shall be deemed to include
any legal or other expenses  reasonably  incurred by such  indemnified  party in
connection  with  investigating  or defending  such Claim.  No person  guilty of
fraudulent  misrepresentation  (within the meaning of Section  11(f) of the Act)
shall be  entitled  to  contribution  from any person who was not guilty of such
fraudulent  misrepresentation.  Notwithstanding anything in this Section 1.10(d)
to the  contrary,  no  indemnifying  party  (other  than the  Company)  shall be
required  pursuant to this Section 1.10(d) to contribute any amount in excess of
the  net  proceeds  received  by  such  indemnifying  party  from  the  sale  of
Registrable  Securities  in the offering to which the Claims of the  indemnified
parties  relate,  less the amount of any  indemnification  payment  made by such
indemnifying party pursuant to Section 1.10(b).

                                       11
<PAGE>
                      (e) Notwithstanding the foregoing,  to the extent that the
provisions on  indemnification  and  contribution  contained in the underwriting
agreement  entered into in connection with the underwritten  public offering are
in conflict with the foregoing  provisions,  the provisions in the  underwriting
agreement  shall control.  

                      (f) The  obligations of the Company and Holders under this
Section  1.10 shall  survive  the  completion  of any  offering  of  Registrable
Securities  in a  registration  statement  under this Section 1, and  otherwise.


                  1.11.  Reports Under  Securities  Exchange Act of 1934. With a
view to making  available  to the Holders the  benefits of Rule 144  promulgated
under the Act and any other rule or  regulation  of the SEC that may at any time
permit  a  Holder  to sell  securities  of the  Company  to the  public  without
registration or pursuant to a registration on Form S-3, the Company agrees to:


                      (a) make and keep public information  available,  as those
terms are understood and defined in SEC Rule 144, at all times;

                      (b) take  such  action as is  necessary  to  maintain  the
Holder's  ability  to  utilize  Form  S-3 for  the  sale  of  their  Registrable
Securities;  (c) file  with the SEC in a timely  manner  all  reports  and other
documents  required  of the  Company  under  the Act and the 1934  Act;  and (d)
furnish to any Holder,  so long as the Holder owns any  Registrable  Securities,
forthwith  upon  request  (i) a written  statement  by the  Company  that it has
complied with the reporting  requirements  of SEC Rule 144, the Act and the 1934
Act (at any time after it so  qualifies),  (ii) a copy of the most recent annual
or quarterly report of the Company and such other reports and documents filed by
the Company with the SEC, and (iii) such other  information as may be reasonably
requested  in  availing  any Holder of any rule or  regulation  of the SEC which
permits the selling of any such securities  without  registration or pursuant to
such form.


                  1.12. Assignment of Registration Rights.

                      (a)  The  rights  to  cause  the   Company   to   register
Registrable Securities pursuant to this Section 1 may be assigned (but only with
all  related  obligations)  by a Holder to a  transferee  or  assignees  of such
securities who acquires at least two percent (2%) of the Registrable  Securities
(as adjusted for stock splits,  combinations  and the like),  provided:  (i) the
Company is, within a reasonable time after such transfer, furnished with written
notice of the name and address of such transferee or assignee and the securities
with respect to which such  registration  rights are being  assigned;  (ii) such
transferee or assignee agrees in writing to be bound by and subject to the terms
and conditions of this Agreement,  including, without limitation, the provisions
of Section 1.14 below; and (iii) such assignment shall be effective only if such
transfer  is  exempt  from  registration  under  the Act.  For the  purposes  of
determining the number of shares of Registrable  Securities held by a transferee
or assignee,  the holding of 

                                       12
<PAGE>
transferees and assignees of a partnership who are partners or retired  partners
of such partnership  (including  spouses and ancestors,  lineal  descendants and
siblings of such partners or spouses who acquire Registrable Securities by gift,
will or intestate succession) shall be aggregated together with the partnership;
provided that all assignees and transferees  who would not qualify  individually
for assignment of registration rights shall have a single  attorney-in-fact  for
the purpose of  exercising  any rights,  receiving  notices or taking any action
under this Section 1.

(b)  Subject to clause (a) above,  the right to have the  Company  register  the
Registrable Securities pursuant to this Section 1 may not otherwise be assigned;
provided,  however,  that any  heir or the  estate  of S&N  which  acquires  the
Registrable Securities from such Holder by will or intestate succession shall be
entitled to have the Company  register the  Registrable  Securities  pursuant to
this  Section 1  (provided  that such heirs or such  estate  shall have a single
attorney-in-fact for the purpose of exercising any rights, receiving any notices
or taking any action under this Section 1), and (ii) any  individual  Holder may
sell, assign or transfer Registrable Securities to his or her spouse or children
or to a trust  established  for the  benefit of his or her  spouse,  children or
himself or herself,  and such  transferee  shall be entitled to have the Company
register the Registrable Securities pursuant to this Section 1, if, and only if,
such transferee agrees in writing to be bound by the terms of this Agreement. In
each such event and for purposes of this  Agreement,  the term  "Holder" as used
herein  shall  include all such heirs,  such estate or such  transferees. 

                  1.13. Limitations on Subsequent  Registration Rights. From and
after the date of this  Agreement,  the  Company  shall not,  without  the prior
written consent of the Holders of two-thirds of the Registrable  Securities then
outstanding,  enter into any agreement with any holder or prospective  holder of
any securities of the Company that would allow such holder or prospective holder
to include such securities in any  registration  filed under Section 1.2 hereof,
unless under the terms of such agreement,  such holder or prospective holder may
include such  securities  in any such  registration  only to the extent that the
inclusion  of such  holder's  securities  will  not  reduce  the  amount  of the
Registrable Securities of the Holders that is included.

                  1.14.  "Market Stand-Off"  Agreement.  S&N hereby agrees that,
during the period of duration  specified  by the Company and an  underwriter  of
Common Stock or other securities of the Company, following the effective date of
a  registration  statement of the Company  filed under the Act, it shall not, to
the extent requested by the Company and such underwriter, directly or indirectly
sell, offer to sell, contract to sell (including,  without limitation, any short
sale),  grant any option to purchase or otherwise  transfer or dispose of (other
than to those who agree to be  similarly  bound) any  securities  of the Company
held by it at any time during such period except  Common Stock  included in such
registration, and S&N agrees to enter into an agreement to such effect with such
underwriter;  provided,  however,  that (a) all  officers  and  directors of the
Company  enter into  similar  agreements,  and, (b) such market  stand-off  time
period shall not exceed 120 days.  If the  underwriters  agree to any waivers of
such  restrictions,  then S&N shall be entitled to sell,  transfer or dispose of
the same number or amount of  securities  of the Company as the person or entity
receiving  such  waiver,  upon the same terms and  conditions  set forth in such
waiver.


                                       13
<PAGE>
                  In order to enforce the  foregoing  covenant,  the Company may
impose stop-transfer  instructions with respect to the Registrable Securities of
S&N (and the shares or securities of every other person subject to the foregoing
restriction) until the end of such period.

                  1.15. No Required  Sale.  Nothing in this  Agreement  shall be
deemed to create an independent obligation on the part of any Holder to sell any
Registrable Securities pursuant to any effective registration statement.

                  2. Miscellaneous.

                  2.1.  Successors  and Assigns.  Except as  otherwise  provided
herein,  and provided that the transfer or assignment is in accordance  with the
terms  hereof,  the terms and  conditions of this  Agreement  shall inure to the
benefit of and be binding  upon the  respective  successors  and  assigns of the
parties  (including  any  permitted  transferees  of any  shares of  Registrable
Securities).  Nothing in this  Agreement,  express or  implied,  is  intended to
confer  upon  any  party  other  than the  parties  hereto  or their  respective
successors and assigns any rights, remedies,  obligations,  or liabilities under
or by reason of this Agreement, except as expressly provided in this Agreement.

                  2.2.  Governing Law. This  Agreement  shall be governed by and
construed  under the laws of the State of Delaware  without regard to principles
of conflicts or choice of laws.

                  2.3.  Counterparts.  This  Agreement may be executed in two or
more counterparts,  each of which shall be deemed an original,  but all of which
together shall constitute one and the same instrument.

                  2.4.  Titles and  Subtitles.  The titles and subtitles used in
this  Agreement  are used for  convenience  only and are not to be considered in
construing or interpreting this Agreement.

                  2.5. Notices.  Unless otherwise provided,  any notice required
or permitted  under this Agreement shall be given in writing and shall be deemed
effectively  given upon  personal  delivery  to the party to be notified or upon
deposit with the United States Post Office,  by  registered  or certified  mail,
postage  prepaid  and  addressed  to the  party to be  notified  at the  address
indicated  for such  party in the Stock  Purchase  Agreement,  or at such  other
address as such party may designate by ten (10) days' advance  written notice to
the other parties.

                  2.6. Expenses.  If any action at law or in equity is necessary
to enforce or interpret the terms of this Agreement,  the prevailing party shall
be entitled to reasonable attorneys' fees, costs and necessary  disbursements in
addition to any other relief to which such party may be entitled.

                  2.7. Amendments and Waivers. Any term of this Agreement may be
amended and the  observance of any term of this  Agreement may be waived (either
generally or 


                                       14
<PAGE>
in a particular instance and either  retroactively or prospectively),  only with
the  written  consent  of the  Company  and the  Holders  of  two-thirds  of the
Registrable  Securities  then  outstanding.  Any amendment or waiver effected in
accordance  with this  Section  2.7  shall be  binding  upon each  Holder of any
Registrable  Securities  then  outstanding,  each  future  Holder  of  all  such
Registrable Securities, and the Company.

                  2.8. Severability. If one or more provisions of this Agreement
are held to be  unenforceable  under  applicable  law, such  provision  shall be
excluded  from  this  Agreement  and  the  balance  of the  Agreement  shall  be
interpreted  as if such  provision  were so excluded and shall be enforceable in
accordance with its terms.

                  2.9. Nominees for Beneficial Owners. If Registrable Securities
are held by a nominee for the  beneficial  owner thereof,  the beneficial  owner
thereof  may,  at its  option,  be  treated  as the  Holder of such  Registrable
Securities  for purposes of any request or other action by any Holder or Holders
of Registrable  Securities  pursuant to this Agreement (or any  determination of
any number or percentage of shares constituting  Registrable  Securities held by
any Holder or Holders of Registrable Securities contemplated by this Agreement),
provided that the Company shall have received assurances reasonably satisfactory
to it of such beneficial ownership.

                  2.10.  Specific  Performance.  The parties hereto  acknowledge
that there would be no adequate  remedy at law if any party fails to perform any
of its obligations hereunder, and accordingly agree that each party, in addition
to any other  remedy to which it may be entitled  at law or in equity,  shall be
entitled to injunctive relief,  including specific performance,  to enforce such
obligations  without  the  posting of any bond,  and,  if any  action  should be
brought in equity to enforce any of the  provisions of this  Agreement,  none of
the parties  hereto shall raise the defense that there is an adequate  remedy at
law.

                  2.11. No Inconsistent  Agreements.  The Company represents and
warrants to S&N that the rights granted to the Holders of Registrable Securities
hereunder  do not in any way  conflict  with and are not  inconsistent  with any
other  agreements  to which  the  Company  is a party  or by which it is  bound.
Without  the  prior  written  consent  of  the  holders  of  two-thirds  of  the
Registrable  Securities  then  outstanding,  neither  the Company nor any Holder
will,  on or after the date of this  Agreement,  enter into any  agreement  with
respect to its securities which is inconsistent  with the rights granted in this
Agreement or otherwise  conflicts  with the  provisions  hereof,  other than any
lock-up  agreement  with the  underwriters  in  connection  with any  registered
offering  effected  hereunder,  pursuant to which the Company shall agree not to
register for sale, and the Company shall agree not to sell or otherwise  dispose
of,  Common  Stock  or  any  securities   convertible  into  or  exercisable  or
exchangeable  for Common Stock,  for a specified period following the registered
offering.  The  Company  further  agrees that if any other  registration  rights
agreement  entered into after the date of this  Agreement with respect to any of
its securities  contains terms which are more favorable to, or less  restrictive
on, the other party thereto than the terms and  conditions in this Agreement are
(insofar as they are  applicable to the Holders),  then the terms and conditions
of this  Agreement  shall  immediately  be deemed to have been  amended 

                                       15
<PAGE>
without  further  action by the  Company or any of the  Holders  of  Registrable
Securities so that the Holders shall be entitled to the benefit of any such more
favorable or less restrictive terms or conditions.

                  2.12. Entire Agreement. This Agreement (including the Exhibits
hereto,  if any)  constitutes  the full and entire  understanding  and agreement
between the parties with regard to the subjects hereof and thereof.



                  IN  WITNESS   WHEREOF,   the  parties   have   executed   this
Registration Rights Agreement as of the date first above written.


                                  EXOGEN, INC.



                                  By:  /s/ Patrick A. McBrayer
                                       -----------------------
                                  Name:    Patrick A. McBrayer
                                  Title:   President and Chief Executive Officer
                                  Address: 10 Constitution Avenue
                                           P.O. Box 6860
                                           Piscataway, NJ 08855



                                  SMITH & NEPHEW HOLDINGS, INC.


                                  By: /s/ P. David Southworth
                                      -----------------------
                                  Name:   P. David Southworth
                                  Title:  President
                                  Address: 1450 Brooks Road
                                           Memphis, TN 38116





                [SIGNATURE PAGE TO REGISTRATION RIGHTS AGREEMENT]

                                       16


                                                                   EXHIBIT 10.24
                                          CONFIDENTIAL TREATMENT HAS BEEN SOUGHT
                                        FOR PORTIONS OF THIS EXHIBIT PURSUANT TO
                                        RULE 24B-2 UNDER THE SECURITIES EXCHANGE
                                                        ACT OF 1934, AS AMENDED.










                                  EXOGEN, INC.


                                       AND


                              SMITH & NEPHEW, INC.



                  UNITED STATES SALES REPRESENTATIVE AGREEMENT



                                 August 10, 1998


<PAGE>
                                TABLE OF CONTENTS

                                                                           PAGE
                                                                           ----


 1.     Appointment...........................................................1

 2.     Current Arrangements in Certain Territories...........................2

 3.     Commission............................................................3

 4.     Minimum Number of Orders..............................................4

 5.     Prices and Terms of Sale..............................................6

 6.     S&N's Responsibilities................................................6

 7.     Exogen's Responsibilities.............................................7

 8.     FDA Laws and Regulations..............................................9

 9.     HCFA Reimbursement Codes and CPT Codes...............................10

10.     Warranty Disclaimer; Limitation of Liability.........................10

11.     Insurance............................................................10

12.     Arbitration..........................................................11

13.     Assignment and Successors............................................11

14.     Effective Date, Term and Termination.................................11

15.     Relationship of Parties..............................................13

16.     Miscellaneous........................................................13

\<PAGE>


                                    EXHIBITS


Exhibit A                     Current Arrangements in Certain Territories

Exhibit B                     Prices, Discounts, Allowances and Terms of Sale

Exhibit C                     Potentially Transferred Employees

Exhibit D                     [Intentionally Omitted]

Exhibit E                     Form of Assignment and Assumption Agreement



                                       ii
<PAGE>
                  UNITED STATES SALES REPRESENTATIVE AGREEMENT


                  Agreement dated as of August 10, 1998 between Exogen,  Inc., a
Delaware  corporation of 10 Constitution  Avenue,  Piscataway,  New Jersey 08855
("Exogen"),  and Smith & Nephew,  Inc.,  a Delaware  corporation  of 1450 Brooks
Road, Memphis, Tennessee 38116 ("S&N").


                             PRELIMINARY STATEMENTS

                  A. Exogen and S&N have entered into a Master Agreement,  dated
as of the date hereof  (the  "Master  Agreement"),  providing  for,  among other
things,  (i) the purchase of shares of Exogen's  capital  stock by S&N, (ii) the
option in favor of S&N to enter into a U.S. Stocking Distribution  Agreement,  a
Global  Distribution  Agreement  and (in  certain  cases)  one or more  non-U.S.
individual  country  Distribution  Agreements,  and (iii) the  option to acquire
additional shares of Exogen Common Stock.

                  B. The parties  wish to enter into this  Agreement  as part of
the  relationship  contemplated  by and  pursuant  to the  terms  of the  Master
Agreement.


                  1. Appointment.


                      (a) Subject to the terms and conditions of this Agreement,
for the term of this  Agreement  Exogen  hereby  appoints  S&N as its  exclusive
representative  for the Sale (as  defined  below)  and  promotion  in the United
States and Puerto  Rico of all models of  Exogen's  Sonic  Accelerated  Fracture
Healing  System  ("SAFHS"),  including  without  limitation  the SAFHS  Model 2A
(subject to Exhibit B), the SAFHS 2000 and the Exogen (or SAFHS) 3000  currently
under   development,   including  all  improvements  and  enhancements   thereto
incorporated  into the Products on a commercial basis, for the treatment of bone
fractures,  osteotomies,  arthrodeses  (other than spine fusion) and distractive
osteogenesis  ("Products").  The terms "Sale,"  "Sell,"  "Sold" and "Selling" as
used in this Agreement  shall include  outright sales or transfer in which title
to a Product  passes to the customer  and short and long term leases,  bailments
and other  arrangements  whereby Products are made available to users by Exogen.
S&N hereby  accepts  such  appointment.  Exogen shall not itself Sell or solicit
Sales, or authorize  others to Sell or solicit Sales, for the use or delivery of
the Products anywhere in the United States. Any inquiries  regarding the Sale or
potential Sale of the Products received by Exogen shall be referred to S&N.

                      (b) S&N shall have the right to discharge its  obligations
hereunder  through its own employees,  through its Affiliates (as defined in the
Master Agreement),  through  independent sales  representatives or distributors,
provided  that S&N shall at all times remain  liable for the  activities of such
persons and for compliance with S&N's obligations under this Agreement. Attached
as Exhibit C is a complete  and accurate  list of all  employees of Exogen whose
current primary responsibilities involve the Sale of the Products, together with
the job title, job description,  compensation and benefits of each such employee
("Potentially Transferred Employees").  S&N shall have the right to offer any or
all  Potentially  Transferred  Employees  employment  with S&N and Exogen  shall
encourage the Potentially Transferred Employees to
<PAGE>
whom S&N  offers  employment  to  accept  employment  with S&N.  S&N shall  have
absolute   discretion  with  respect  to  which,  if  any,  of  the  Potentially
Transferred  Employees  S&N may offer  employment.  S&N shall also have absolute
discretion  as to  the  compensation  and  benefits  to be  paid  by  S&N to any
Potentially   Transferred   Employee  who  accept  S&N's  offer  of   employment
("Transferred  Employee").  S&N shall also have the right to establish the terms
of the  employment  of the  Transferred  Employees  and shall  have the right to
terminate or fire any Transferred Employee.  Exogen shall be responsible for any
severance and other obligations owed to Potentially Transferred Employees who do
not become Transferred  Employees and shall indemnify and hold S&N harmless from
any claims, losses or damages relating to the Potentially  Transferred Employees
who do not become Transferred Employees. Exogen shall [****]; provided, however,
Exogen's  obligations  shall not exceed  those set forth in  Exogen's  severance
policy in effect as of the date of this  Agreement.  Exogen shall also indemnify
and hold S&N  harmless  from and  against  any  claims,  losses or damages  with
respect to Potentially  Transferred Employees arising prior to or accrued to the
date of this Agreement and with respect to Transferred  Employees  arising prior
to or accrued to the date on which such employee becomes a Transferred  Employee
(except for any claims,  losses or damages caused by S&N).  S&N shall  indemnify
and hold  harmless  Exogen from and against any claims,  losses or damages  with
respect  to  Transferred  Employees  arising  on or after the date on which such
employee becomes a Transferred  Employee (except for (i) the specific  severance
obligation of Exogen set forth in the precedent  sentence;  and (ii) any claims,
losses  or  damages  caused  by  Exogen.  The  parties  agree  that  if (a)  any
Potentially Transferred Employees who are identified in Exhibit C do not, during
the  first  180  days  after  the  effective  date of this  Agreement,  become a
Transferred   Employee  or  do  not  remain  a  Transferred  Employee  or  sales
representative  or distributor  of S&N (or employee  thereof) at the end of such
180 day  period,  and (b) the  percentage  of  volume  as  shown  on  Exhibit  C
associated  with  all  Potentially  Transferred  Employees  who  do  not  become
Transferred  Employees  or  do  not  remain  a  Transferred  Employee  or  sales
representative  or distributor  (or employee  thereof) of S&N at the end of such
180 day period  exceeds 20%,  then the sum of the number of Units listed next to
such Potentially  Transferred Employees will be deducted from the Minimum Number
of Units for Contract Year 1, but in no event shall the reduction  exceed [****]
Units.

                      2. Current Arrangements in Certain Territories.

                      (a)  Attached  hereto  as  Exhibit  A  is a  complete  and
accurate list of territories in the United States in which Exogen  currently has
agreements   ("Distribution   Agreements")   with   sales   representatives   or
distributors  ("Distributors")  for the Sale of Products.  Exogen represents and
warrants that Exogen has delivered a full and complete copy of all  Distribution
Agreements  to  S&N,  together  with  all  addenda,  amendments,  modifications,
extensions, renewals, and notices sent or received pursuant to the terms of each
Distribution  Agreement  and copies or  summaries  of any  programs  or policies
applicable to Distributors.  Exogen further  represents and warrants to S&N that
the Distribution Agreements constitute a

- ------------
     [****]  REPRESENTS  MATERIAL WHICH HAS BEEN REDACTED  PURSUANT TO A REQUEST
FOR CONFIDENTIAL  TREATMENT PURSUANT TO RULE 24B-2 UNDER THE SECURITIES EXCHANGE
ACT OF 1934, AS AMENDED.

                                       2
<PAGE>
valid and binding  obligation  of the parties  thereto and are in full force and
effect and may be transferred to S&N and immediately thereafter will continue in
full force and effect,  and in each case  without  breaching  the terms  thereof
resulting in the  forfeiture or impairment of any rights  thereunder and without
the  consent,  approval or act of, or the making of any filing with or providing
any notice to,  any other  party.  Exogen has  fulfilled  and  performed  in all
material respects its obligations under each of the Distribution  Agreements and
Exogen is not in nor, to the best of its  knowledge,  alleged to be in breach or
default  under  any of the  Distribution  Agreements,  and there is no basis for
termination  of the  Distribution  Agreements.  Exogen  further  represents  and
warrants that, to the best of Exogen's knowledge, no Distributor has breached or
defaulted  thereunder,  and no event has  occurred  and no condition or state of
facts  exists  which,  with the passage of time or the giving of notice or both,
would constitute such a default or breach by Exogen,  or to the best of Exogen's
knowledge by any Distributor. Exogen also represents and warrants that Exogen is
not currently renegotiating any of the Distribution Agreements or has offered or
paid or agreed to pay any  consideration  to any  Distributor not required under
the Distribution Agreements.  Exogen further represents and warrants to S&N that
there have been no  modifications  or amendments to the  Distributor  Agreements
either orally or in practice other than those amendments  delivered or described
to S&N. Exogen shall make all payments and satisfy all of its obligations  under
the  Distribution  Agreements  arising  or  accruing  prior  to the date of this
Agreement.  Any  announcement  or  initial  communication  to  the  Distributors
concerning  the  assignment of the  Distribution  Agreements  from Exogen to S&N
shall be mutually agreed upon by Exogen and S&N.

                      (b) Exogen and S&N shall,  on the date of this  Agreement,
execute and deliver an  Assignment  and  Assumption  Agreement  duly executed by
Exogen in the form  attached  hereto as Exhibit E pursuant to which Exogen shall
assign the Distribution  Agreements to S&N and S&N shall assume the Distribution
Agreements. 


         3.  Commission.  S&N will be entitled to a commission  of [****] on the
Net Sales of  Products  by Exogen  for use or  delivery  anywhere  in the United
States for sales up to the then  applicable  Minimum Number of Units (as defined
in  Section  4) and  [****]  of the Net  Sales  for  Sales in excess of the then
applicable  Minimum  Number of Units.  "Net Sales" means the amount shown on the
invoice as due from the patient and/or insurer,  after giving effect to quantity
or other discounts (as provided for in Section 5 hereof),  less any shipping and
insurance  charges and taxes shown on such invoice and a reasonable  reserve for
bad debt.  The  reserve  for bad debt shall be  estimated  based  upon  Exogen's
history of reimbursement for the Products by patients and/or insurers during the
preceding 12-month period.  This reserve will be recalculated at the end of each
calendar  quarter  and the new  estimate  will be  applied  to all Net  Sales of
Products sold during the next  following  calendar  quarter.  Adjustments to Net
Sales for Units  returned  unused  shall not be  included in the reserve for bad
debt, but shall be credited against and reduce any future commission  payable to
S&N in an amount equal to the original commission paid to S&N on such Net Sales.
Exogen shall, within 15 days after the end of each

- ------------
     [****]  REPRESENTS  MATERIAL WHICH HAS BEEN REDACTED  PURSUANT TO A REQUEST
FOR CONFIDENTIAL  TREATMENT PURSUANT TO RULE 24B-2 UNDER THE SECURITIES EXCHANGE
ACT OF 1934, AS AMENDED.


                                       3
<PAGE>
month, deliver to S&N (i) a report showing the Net Sales of Products Sold during
such month (which report shall include  physician and patient  information) on a
sales  territory by sales  territory  basis and (ii) payment of the  commissions
owed to S&N for the Net Sales of Products  shown in such  report.  In  addition,
Exogen shall provide S&N with reports  concerning  sales  commissions  and order
activity to the same extent as Exogen  generates  such reports as of the date of
this  Agreement.  S&N shall  have the right  upon  reasonable  notice and during
regular business hours to audit the reports delivered to it by Exogen.

                  4. Minimum Number of Orders.

                  (a) Except as otherwise provided in this Agreement,  S&N shall
place  orders with  Exogen for not less than the  applicable  minimum  number of
Units (the "Minimum  Number of Units") of Products set forth below for each year
commencing on August 1, 1998 and on August 1 of each year thereafter  during the
term of this  Agreement  (each such year being referred to herein as a "Contract
Year").  The Minimum  Number of Units for Contract  Year 1 shall be reduced on a
pro rata  basis  for the  period  between  August  1,  1998 and the date of this
Agreement.

Contract Year          Tier 1                 Tier 2               Requisite
                       Minimums               Minimums             Approval
                                                                   Differential
Year 1                 [****]                 [****]               [****]
Year 2                 [****]                 [****]               [****]
Year 3                 [****]                 [****]               [****]

Year 4 and each  subsequent year to be negotiated in good faith no sooner than 7
months and no later than 6 months  prior to the  expiration  of the then current
Contract Year.

If the parties are unable to agree upon the Minimum Number of Units for any such
Contract  Year,  then this  Agreement  shall  terminate in  accordance  with the
provisions of Section 14(e).

For purposes of this Agreement,  a "Unit" shall consist of a main operating unit
and a transducer  head but shall not include any Units  covered by Sections 7(d)
and (e). S&N shall not be deemed to have  "ordered" a Unit unless and until such
Unit has  received  reimbursement  approval and has been shipped and invoiced by
Exogen (unless  Exogen fails to ship such Unit in accordance  with Section 7(a),
in which case such Unit shall be deemed to have been shipped in accordance  with
Section 7(a)).

(b) Tier 1  Minimums  shall  apply  commencing  on the  later of  [****]  or the
Requisite Approval Date.  "Requisite Approval Date" shall mean the date on which
all  of the  following  have  occurred:  (i)  the  Pre-Market  Approval  ("PMA")
Supplement  for  one or more of the  Products  for  [****]  fractures  has  been
approved  by the U.S.  Food and Drug  Administration 


- ------------
     [****]  REPRESENTS  MATERIAL WHICH HAS BEEN REDACTED  PURSUANT TO A REQUEST
FOR CONFIDENTIAL  TREATMENT PURSUANT TO RULE 24B-2 UNDER THE SECURITIES EXCHANGE
ACT OF 1934, AS AMENDED.


                                       4
<PAGE>
("FDA"),  and (ii) the PMA  Supplement  for the  Exogen  3000  Product  has been
approved by the FDA, and can be marketed for [****] fresh fractures, and (iii) a
favorable  national  coverage  policy for one or more of the  Products  has been
issued by the US Health Care Financing  Administration  ("HCFA"), (the approvals
under  clauses (i),  (ii) and (iii) being  referred to herein as the  "Requisite
Approval").  Tier 2 Minimums  shall apply so long as the Requisite  Approval has
not occurred.

                      (c) If the Requisite  Approval Date occurs during Contract
Year 2, the applicable  Minimum Number for Contract Year 2 and for Contract Year
3 shall be as follows:


                            (i) The  Minimum  Number for  Contract  Year 2 shall
equal the sum of [****]:

plus the product of (x) a fraction, the numerator of which is the number of days
occurring  in  Contract  Year 2  after  the  Requisite  Approval  Date  and  the
denominator  of which is 365,  times (y) [****]  (being the  Requisite  Approval
Differential for Contract Year 2 as shown in the above table).

                            (ii) The Minimum  Number for  Contract  Year 3 shall
equal the sum of:

                                    (A)  The  product  of  (A) a  fraction,  the
numerator of which is the number of days in Contract  Year 3 ending on or before
the first  anniversary  of the Requisite  Approval Date and the  denominator  of
which is 365, times (B) [****] (being the sum of the Tier 2 Minimum for Contract
Year 3 plus the  Requisite  Approval  Differential  for Contract Year 2, both as
shown in the above table); plus

                                    (B)  The  product  of  (A) a  fraction,  the
numerator  of which is the number of days in Contract  Year 3 ending  after such
first  anniversary  and the denominator of which is 365, times (B) [****] (being
the sum of the Tier 2 Minimum for Contract  Year 3 plus the  Requisite  Approval
Differential for Contract Year 3, both as shown in the above table).

                      (d) If the Requisite  Approval Date occurs during Contract
Year 3, the  applicable  Minimum  Number for Contract Year 3 shall be the sum of
[****]:

plus the  product of (x) a  fraction,  the number of which is the number of days
occurring  in  Contract  Year 3  after  the  Requisite  Approval  Date  and  the
denominator  of which is 365,  times (y) [****]  (being the  Requisite  Approval
Differential for Contract Year 2 as shown in the above table).

                      (e) If the  applicable  Minimum  Number  of  Orders is not
achieved in any Contract  Year,  then,  at S&N's  option,  S&N shall do one or a
combination of the following:


- ------------
     [****]  REPRESENTS  MATERIAL WHICH HAS BEEN REDACTED  PURSUANT TO A REQUEST
FOR CONFIDENTIAL  TREATMENT PURSUANT TO RULE 24B-2 UNDER THE SECURITIES EXCHANGE
ACT OF 1934, AS AMENDED.


                                       5
<PAGE>
                            (i)  Within 60 days  after the end of such  Contract
Year,  S&N shall pay to Exogen  its Net  Profit on the  difference  between  the
applicable  Minimum Number for such Contract Year and the actual number of Sales
of Products  during such Contract Year. "Net Profit" means the average Net Sales
price to the  patient or third party  payor of each  Product  Sold in the United
States during the Contract Year,  less S&N's  commission  and Exogen's  Standard
Manufacturing  Cost,  multiplied by the  difference  between the number of units
actually  sold  and  the  Minimum  Number  for  that  Contract  Year.  "Standard
Manufacturing  Cost" means direct  materials,  direct labor and factory overhead
computed  in  accordance   with   generally   accepted   accounting   principles
consistently  applied  and  averaged  for each device on the basis of unit Sales
over the Contract Year; and/or

                            (ii) S&N may elect to have the  Minimum  Number  for
the next Contract Year increased by the  difference  between the number of units
actually  Sold under this  Agreement and the Minimum  Number for the  applicable
Contract Year, up to 10% of the Minimum Number; or

                            (iii) S&N may elect to terminate  this  Agreement on
six months' written notice to Exogen,  during which  six-month  period S&N shall
continue to be a sales representative for Products on a non-exclusive basis with
no obligation to meet any minimum  requirement or to spend any particular amount
on marketing,  advertising and promotional activities. Any election by S&N under
this Subsection (e) shall be exercised by written notice to Exogen no later than
60 days after the end of a Contract Year.


         5. Prices and Terms of Sale.  Products shall be offered for Sale by S&N
at  such  prices,  discounts,  allowances  and on  such  terms  of  Sale  as are
established by Exogen from time to time after reasonable  consultation with S&N,
taking into account  manufacturing,  sales and marketing costs, customer demand,
and competitive factors in the marketplace.  S&N shall receive at least 30 days'
advance written notice of any change in prices, discounts,  allowances and terms
of Sale. Current prices, discounts,  allowances and terms of Sale, which are set
forth in  Exhibit  B, will not be  modified  in any  material  respect  prior to
December 31, 1998 without the prior written approval of S&N.


         6. S&N's Responsibilities.

                  (a) S&N and its sales  representatives  and distributors shall
regularly call upon or otherwise  contact  physicians,  trauma centers and other
organizations  and  individuals  who are in a position to  prescribe  the use of
Products  to their  patients.  Each  order for a Product  shall be written on an
order form to be  developed  jointly by S&N and Exogen,  and shall be  submitted
promptly to Exogen by S&N along with a physician's  prescription and a letter of
medical  necessity  and  any  other  information   reasonably  required  by  the
applicable third party payor.

                  (b) S&N  shall  provide  reasonable  follow  up  contact  with
physicians  and patients to  demonstrate,  explain and in-service the use of the
Products.

                                       6
<PAGE>
                  (c) S&N shall submit a non-binding sales forecast to Exogen on
or prior to the  first  day of each  calendar  quarter  for the next  succeeding
twelve-month  period.  Exogen shall have the right to disapprove the forecast by
providing  S&N with written  notice of  disapproval  no later than ten (10) days
following receipt of the forecast.  The forecast shall be deemed approved unless
a notice of  disapproval is  transmitted  in accordance  with this section.  The
parties  shall   negotiate  in  good  faith  with  respect  to  any  dispute  or
disagreement  concerning  the  forecast.  Such  forecast  shall be updated  more
frequently  if  there is a  material  change  in any  information  on which  the
forecast is based.

                  (d) S&N shall  incur  costs  for  marketing,  advertising  and
promotional  activities in connection  with the Products of not less than [****]
during each of the first two Contract  Years.  Such  marketing,  advertising and
promotional  activities  shall be as agreed upon from time to time by Exogen and
S&N in the manner specified in Section 7(j).

                  (e) S&N shall  provide a project  manager for the  Products at
S&N's  expense.  The project  manager may support  both the  Products  and other
products of S&N. The salary and  benefits  associated  with the project  manager
shall not be considered as marketing expenses for purposes of Section 6(d).

                  (f) S&N will use diligent  efforts to  integrate  the Products
into its  distribution  structure  within its  Orthopaedics  Division as well as
other divisions of S&N throughout the United States to enhance the  distribution
channels established by Exogen and assigned to S&N as part of this Agreement.

                  (g) Exogen shall enter into service agreements for the benefit
of S&N with  respect to other  equipment,  supplies  and services as the parties
agree may be required or desired for S&N to satisfy its  obligations  under this
Agreement.

         7. Exogen's Responsibilities.

                  (a) Except as provided in Subsection (b), Exogen shall process
all orders  submitted to it by S&N and shall be responsible for  pre-certifying,
arranging  shipments and making collections from patients and/or their insurers.
Exogen shall use diligent efforts to supply Products in excess of the quantities
provided for on the forecast delivered under Section 6(c). Provided, however, in
no event shall Exogen be obligated to supply Products in excess of [****] of the
quantities  provided for on the forecast  delivered under Section 6(c) shall not
constitute  a  default  under  this  Agreement.  Upon  receipt  from  S&N of the
documentation   required  under  Section  6(a)  and  appropriate   reimbursement
approvals  under Section 6(a) of this  Agreement,  Exogen shall promptly (but no
later than 5 days after  obtaining such  documentation  and approvals)  ship the
Product. Shipments shall be made to S&N or directly to the prescribing physician
or  patient as S&N shall  direct.  Each unit  shipped  shall be  accompanied  by
appropriate

- ------------
     [****]  REPRESENTS  MATERIAL WHICH HAS BEEN REDACTED  PURSUANT TO A REQUEST
FOR CONFIDENTIAL  TREATMENT PURSUANT TO RULE 24B-2 UNDER THE SECURITIES EXCHANGE
ACT OF 1934, AS AMENDED.

                                       7
<PAGE>
directions  for use and a  standard  warranty.  Exogen  shall also  transmit  an
invoice to the patient and/or insurer,  as applicable,  setting forth the price,
discount or allowance, if any, and other terms of Sale. Exogen may reject orders
submitted  to it by S&N only if Exogen has a good faith  belief that the patient
and/or  insurer  may be unable or  unwilling  to pay the  invoice  submitted  by
Exogen.  In such a case,  Exogen shall give S&N written notice within seven days
that the order has been  rejected.  S&N may then,  at its  option and on written
notice,  require  Exogen to fill such order and shall  indicate  in the  written
notice whether the Units ordered are to be considered  PCUs (as defined  below).
If such Units are not  considered  PCUs and if the patient and/or insurer should
fail to pay  Exogen's  invoice  within 150 days,  S&N shall pay Exogen an amount
equal to 150% of Exogen's Standard  Manufacturing Cost for the Product (less any
amount paid by such patient and/or  insurer).  Exogen shall thereupon  assign to
S&N all of its legal rights  against such patient and/or insurer with respect to
such invoice, and S&N shall be entitled to pursue such rights in its own name.

                  (b) S&N shall have the right to visit  Exogen's  manufacturing
facility and to observe the work in process and perform  quality and  compliance
audits during regular business hours on reasonable advance notice to Exogen. The
parties shall discuss S&N's  observations and findings in good faith, and Exogen
will take any corrective  actions mutually agreed to by Exogen and S&N resulting
from those good faith negotiations at Exogen's expense.

                  (c) Exogen will provide to S&N, at Exogen's cost, a reasonable
quantity of  training  materials,  directions  for use,  advertising  materials,
catalog sheets and other promotional  material.  Materials which refer to S&N in
any manner shall not be used or distributed  without the prior written  approval
of S&N.

                  (d) At the request of S&N,  Exogen shall  furnish to S&N up to
150 SAFHS fully  operational  demonstration  units of the model requested by S&N
and 150  additional  transducer  heads during the first two Contract Years at no
cost to S&N.

                  (e) During the first two Contract Years,  Exogen shall furnish
up to [****]  Professional  Courtesy  Units  ("PCUs") in the United States at no
cost to S&N. PCUs will either be  designated  by S&N on the orders  submitted to
Exogen or designated as such in accordance with Section 5.

                  (f)  Exogen  will  maintain  a  24-hour  a day  hot  line  and
toll-free  telephone number to respond to inquiries from physicians and patients
and will provide  reasonable  field service  assistance as required from time to
time.  Exogen  will also  provide  other  technical  support  for the  Products,
including  clinical and  scientific  data collected by Exogen with regard to the
use of the Products by patients.


- ------------
     [****]  REPRESENTS  MATERIAL WHICH HAS BEEN REDACTED  PURSUANT TO A REQUEST
FOR CONFIDENTIAL  TREATMENT PURSUANT TO RULE 24B-2 UNDER THE SECURITIES EXCHANGE
ACT OF 1934, AS AMENDED.


                                       8
<PAGE>
                  (g) Exogen  will  provide S&N with any changes in the plans or
specifications  for  existing  Products  or any new  Product or  improvement  or
development  no  later  than  60  days  prior  to  implementing  any  change  or
initiative.  S&N shall have the right to  provide  comments  regarding  any such
change or initiative and Exogen shall consider such comments in good faith.

                  (h) Exogen  shall  perform all  warranty  work on Products and
shall process and refurbish all returned Products at its own cost and expense.

                  (i) Exogen  shall  incur  out-of-pocket  costs for  marketing,
advertising  and  promotional  activities in connection with the Products of not
less than [****] during each of the first two Contract  Years.  Such  marketing,
advertising and promotional activities shall be as agreed upon from time to time
by Exogen and S&N and the parties  shall  develop an annual  marketing  plan and
budget which shall include,  without  limitation,  scientific  meeting  support,
speaker forum activity and third-party payor marketing materials and programs.

                  (j) Exogen  shall not pay or grant any  consideration,  bonus,
stock  option  or  other   benefit  to  any  employee,   distributor   or  sales
representative of S&N or its Affiliates, except as provided in this Agreement.

                  (k) Exogen will  provide,  during each  Contract  Year,  up to
three 2-day  training  sessions at Exogen's  offices,  including the cost of the
trainers,  facilities and equipment required for the training. Exogen shall also
reimburse S&N an amount not to exceed  [****] in the aggregate  during the first
two Contract  Years for expenses paid or incurred by S&N for training (but in no
event  including  internal  personnel  or overhead  costs of S&N).  Exogen shall
reimburse  S&N for any such  expenses  associated  with  training paid by S&N no
later than 30 days following receipt of S&N's invoice.

         8. FDA Laws and Regulations.

                  (a)  Exogen  warrants  and  represents  to S&N that the  SAFHS
device received  PreMarketing Approval ("PMA") from the FDA in October 1994, and
that a PMA Supplement for the SAFHS 2000 device was approved by the FDA in March
1997.  Exogen  will  keep such  approvals  in full  force  and  effect by filing
required  supplements and annual reports with the FDA.  Exogen further  warrants
and represents  that prior to the effective date of this  Agreement,  Exogen has
operated its business in the United  States in  compliance  with all Permits (as
defined  in the  Master  Agreement)  in all  material  respects.  Exogen has not
engaged in any practice or course of conduct,  which,  if continued or practiced
by S&N would result in a material breach of any law, rule or regulation.


- ------------
     [****]  REPRESENTS  MATERIAL WHICH HAS BEEN REDACTED  PURSUANT TO A REQUEST
FOR CONFIDENTIAL  TREATMENT PURSUANT TO RULE 24B-2 UNDER THE SECURITIES EXCHANGE
ACT OF 1934, AS AMENDED.

                                       9
<PAGE>
                  (b) Products  shall be  manufactured  and labeled by Exogen in
accordance  with the  submissions  it has made and the approvals it has received
from the FDA in all material respects and in accordance with all laws applicable
to the  manufacture  and  labeling of medical  devices  including  the rules and
regulations  of the  FDA  and  good  manufacturing  practices.  Products  or the
packaging  shall  indicate  that the  Product  is  manufactured  by  Exogen  and
distributed by S&N, and the parties shall mutually agree on the artwork,  layout
and presentation of company names, trade names,  trademarks and logos; provided,
however,  that Exogen  shall have the right to review and approve in advance any
material  changes to the promotional  materials for compliance with FDA labeling
requirements and related regulatory issues.

                  (c) Exogen is  currently  involved in the  development  of the
Exogen (or SAFHS) 3000 device,  in submitting a PMA Supplement  with the FDA for
the Exogen (or SAFHS) 3000 device,  and in submitting a PMA Supplement  with the
FDA for  expanded  labeling  for the SAFHS 2000  device for  certain  additional
indications.  Exogen will use its diligent  efforts to complete these activities
as soon as  possible,  and to  obtain  such FDA and  other  approvals  as may be
required,  in order to market in the United  States  the Exogen (or SAFHS)  3000
device and the SAFHS 2000 and/or 3000 device for additional indications,  all at
Exogen's  expense.  S&N shall be kept  advised  of the  status of the  foregoing
programs.

         9. HCFA Reimbursement Codes and CPT Codes. Exogen will use its diligent
efforts  to  obtain a  favorable  national  coverage  policy  from  HCFA for the
Products for the additional indications referred to above and Current Procedural
Terminology  ("CPT")  codes for all  applications  of the  Products  at Exogen's
expense.  Exogen shall be solely responsible for verifying and using correct and
approved  code numbers in all  billing,  reimbursement  materials,  labeling and
advertising and promotional material.

         10. Warranty Disclaimer; Limitation of Liability.

                  (a) Except as specifically set forth in this Agreement, Exogen
makes no warranties to S&N with respect to the Products or any services.  Exogen
disclaims all implied  warranties,  including  warranties of merchantability and
fitness for a particular purpose.

                  (b)  Neither  Exogen  nor S&N shall in any event be liable for
any loss of profits,  or for any special,  incidental or  consequential  damages
arising  out of or in  connection  with  the  sale,  use or  performance  of the
Products. 

                  (c) In no event will Exogen be liable for: (i) damages  caused
by S&N's  failure to  perform  its  covenants  and  responsibilities  under this
Agreement and the Master  Agreement,  by reason of S&N's negligence or otherwise
(other than  failures by S&N that are caused by Exogen's  failure to perform its
covenants  and   responsibilities);   or  (ii)  damages  caused  by  repairs  or
alterations  to  Products  by  S&N,  its  Affiliates,   distributors  and  sales
representatives.

         11.  Insurance.  Exogen  warrants  and  represents  to S&N  that it has
products liability  insurance coverage for its SAFHS devices in the amount of $3
million per occurrence and $3 million in the aggregate,  and additional umbrella
coverage in the amount of $10 million 

                                       10
<PAGE>
per  occurrence  and $10 million in the  aggregate.  Exogen shall name S&N as an
additional  party insured under all such policies,  shall maintain such coverage
during the term of this Agreement and shall,  upon request from S&N from time to
time, direct the carriers to issue certificates confirming that such coverage is
in effect.

         12.  Arbitration.  Disputes  regarding this Agreement shall be resolved
through  arbitration  by a  single,  qualified  arbitrator  selected  by  mutual
decision of the parties from three candidates furnished by the then President of
the Health Industry Manufacturers Association ("HIMA"). If the President of HIMA
is unwilling or unable to provide a list of candidates,  the candidates shall be
proposed by the American Arbitration Association,  Wilmington,  Delaware office,
from its Large,  Complex  Dispute  Panel.  If the parties are unable to mutually
select  the  single  arbitrator  from said list,  then the  arbitrator  shall be
selected by said American Arbitration Association,  Wilmington, Delaware office.
The  arbitration  proceedings  shall be  conducted in  accordance  with the then
current  Rules  for  Large,   Complex  Disputes  of  the  American   Arbitration
Association,  or in  accordance  with  such  other  rules or  procedures  as the
Arbitrator  may  specify.  The  arbitration  shall  take  place  in  Wilmington,
Delaware. Each party will bear its own arbitration expenses plus one-half of the
arbitrator's fee. The ruling of the arbitrator shall be final and binding.

         13.  Assignment and  Successors.  Neither this Agreement nor any rights
granted hereunder may be assigned or transferred by either party except with the
prior written  consent of the other party or in accordance  with Section 7(b) of
the Master Agreement. Such consent shall not be unreasonably withheld, except in
the case of assignment to an Affiliate , in which case such consent shall not be
required.  Any purported assignment which requires consent shall be void without
consent.  Subject to the limitations on assignment herein,  this Agreement shall
be binding upon and inure to the benefit of any successors and assigns of Exogen
and S&N. Any such successor or assignee of a party's  interest  shall  expressly
assume in  writing  the  performance  of all the terms  and  conditions  of this
Agreement to be performed by such party.

         14. Effective Date, Term and Termination.

                  (a) This Agreement  shall become  effective on August 10, 1998
and  shall  remain  in  effect  to and  including  August  9,  2008 or until the
execution and delivery of the U.S. Stocking Distribution Agreement (as such term
is defined in the Master  Agreement)  unless sooner terminated by mutual consent
or pursuant to Subsection 16(c).

                  (b) S&N shall  have the right and  option to renew the term of
this Agreement for successive  three year terms,  each upon mutually  acceptable
terms and  conditions.  S&N shall  exercise  these renewal  options by providing
Exogen with written  notice no later than six months prior to the  expiration of
the current term.  The parties shall  negotiate in good faith.  In the event the
parties are unable to  mutually  agree upon such terms and  conditions  upon the
expiration of the initial  term,  S&N shall have the right to extend the term of
this  Agreement  for one five year  period on the terms and  conditions  then in
effect, except that: S&N's appointment shall be non-exclusive; there shall be no
Minimum Number of Units;  and S&N shall not be entitled to any  improvements  or
enhancements incorporated into the Products on a commercialized basis during the
five year extension term. Notwithstanding the foregoing, if any


                                       11
<PAGE>
improvements  or  enhancements   are   incorporated   into  the  Products  on  a
commercialized basis during that period,  Exogen shall notify S&N in writing and
shall provide a description of the  improvements  or  enhancements  and an offer
whereby  Exogen  would  include the  improvements  and  enhancements  under this
Agreement ("Initial Offer"). S&N shall have thirty (30) days from receipt of the
Initial Offer to accept the Initial Offer by providing written notice to Exogen.
Thereafter,  the  parties  shall  negotiate  in good  faith  with  respect to an
amendment to this Agreement which includes the improvements or enhancements as a
Product under this  Agreement.  If S&N does not accept the Initial  Offer,  then
Exogen  shall be  permitted to execute a sales  representative  or  distribution
agreement with a third party provided the terms and conditions of such agreement
are no more favorable to the third party than the Initial Offer. If the terms of
the  proposed  agreement  with a third  party  ("Third  Party  Terms")  are more
favorable to the third party than the Initial  Offer,  then Exogen shall provide
written  notice to S&N together  with the Third Party Terms and S&N shall have a
period of thirty (30) days from receipt to provide written notice to Exogen that
S&N is  willing  to accept  the Third  Party  Terms.  If S&N  provides a written
acceptance,   the  parties  shall   execute  an  amendment  to  this   Agreement
incorporating  the Third Party Terms. If S&N fails to accept,  then Exogen shall
be permitted to enter into an agreement  with the third party on the Third Party
Terms. Any dispute as to whether the Third Party Terms are more favorable to the
third party than the Initial Offer shall be decided by arbitration in accordance
with Section 12.

                  (c) This  Agreement  may be  terminated  at any time by either
party in the event of a material  default by the other party,  provided that the
party seeking to terminate the Agreement gives the other party written notice of
the  default  and a period  of 60 days in which  to cure  the  default.  If this
Agreement  is  terminated  pursuant to this  Subsection  (c), in addition to all
rights and remedies any party may have available at law or at equity, all orders
outstanding  on the  date of  termination  will be  honored  by  Exogen  and all
commissions  due to S&N will be paid.  If the  material  default  is a result of
Exogen's  failure  to  provide  or  supply  Products  in  accordance  with  this
Agreement,  S&N may elect not to terminate this Agreement,  S&N shall retain all
of its rights  under this  Agreement  and  require  Exogen to satisfy  all other
obligations  and  responsibilities  hereunder  to the  extent  Exogen is able to
perform.   If  Exogen  is  not  able  to  satisfy  such  other  obligations  and
responsibilities, S&N shall be permitted to do so.

                  (d)  If  the  Agreement  should  be  terminated  because  of a
material  default on the part of S&N,  S&N will within 60 days after the date of
termination  pay to Exogen in a lump sum  [****]  and will  assign to Exogen all
agreements  relating to the Products with its distributors  and, if requested by
Exogen, terminate its relationship with respect to the Transferred Employees. In
addition, S&N will allow Exogen to offer employment to all Transferred Employees
who remain  employed by S&N and shall  cooperate  with Exogen in the transfer of
any such individuals who accept  re-employment with Exogen.  Provided,  however,
S&N shall not be liable or responsible  if Transferred  Employees do not wish to
be re-employed by Exogen or elect to remain an employee of S&N.  Nothing in this
Section  14(d) shall limit the rights and 

- ------------
     [****]  REPRESENTS  MATERIAL WHICH HAS BEEN REDACTED  PURSUANT TO A REQUEST
FOR CONFIDENTIAL  TREATMENT PURSUANT TO RULE 24B-2 UNDER THE SECURITIES EXCHANGE
ACT OF 1934, AS AMENDED.

                                       12
<PAGE>
remedies  of Exogen at law or in equity  with  respect to Losses (as  defined in
Section 12.2 of the Master Agreement) from third party claims.

                  (e) If the parties are unable to agree upon the Minimum Number
of Units in accordance  with Section 4(a),  then this Agreement  shall terminate
six months following the end of the then current  Contract Year.  During the six
month  period S&N shall have the right to continue to be a sales  representative
for Products on a  non-exclusive  basis with no  obligation  to meet any minimum
requirement  or to spend any  particular  amount on marketing,  advertising  and
promotional activities.  During the six month period the parties shall cooperate
in good faith to unwind this  Agreement.  At the end of the six month period S&N
will  assign  to  Exogen  all  agreements  relating  to the  Products  with  its
distributors and, at Exogen's election,  terminate its relationship with respect
to the  Transferred  Employees.  In  addition,  S&N will  allow  Exogen to offer
employment to all  Transferred  Employees  who remain  employed by S&N and shall
cooperate  with  Exogen  in the  transfer  of any such  individuals  who  accept
re-employment  with  Exogen.  Provided,  however,  S&N  shall  not be  liable or
responsible if Transferred  Employees do not wish to be re-employed by Exogen or
elect to remain an employee of S&N.

         15.  Relationship  of  Parties.  The  parties  hereto  are  independent
contractors.  This Agreement  shall not create any  partnership or joint venture
relationship.  Neither  party has the  authority,  right or  ability  to bind or
commit the other in any way  (including,  without  limitation,  by S&N accepting
orders) and will not attempt to do so or imply that it may do so.

         16. Miscellaneous.

                  (a) This Agreement shall be governed by the substantive law of
the State of Delaware.  Any action to enforce the arbitration provisions of this
Agreement  pursuant to Section 14, or any arbitration  award,  may be brought in
any State or Federal  Court in the United  States  where the party is subject to
personal jurisdiction.

                  (b)  This  Agreement,  together  with  all  Exhibits  attached
hereto, the Master Agreement and the other agreements contemplated by the Master
Agreement  represent  the entire  agreement  of the parties  with respect to the
subject matter hereof.

                  (c) This  Agreement  may be amended  only by an  agreement  in
writing executed by both parties.

                  (d) The  obligations of the parties under this Agreement shall
be subject to Government  regulations,  significant  material  shortages,  labor
disputes,  war, embargoes,  and causes beyond the reasonable control of a party.
The party whose  performance is prevented or delayed as the result of any of the
foregoing  shall use  continuous,  diligent  efforts to remedy its  inability to
perform.

                  (e) If one of the  provisions  of  this  Agreement  should  be
declared  void or  unenforceable,  the remaining  terms of the  Agreement  shall
continue in full force and effect unless such construction is unreasonable. 

                  (f) This Agreement may be signed in one or more counterparts.



                                       13

<PAGE>

                  (g) All notices shall be deemed  complete on  transmission  by
facsimile or within ten days from the date of mailing if sent by  registered  or
certified  mail.  Notices  shall be sent to the addresses set forth above unless
either party designates a different address.


                           [SIGNATURE PAGE TO FOLLOW]




                                       14
<PAGE>





August 10, 1998                     EXOGEN, INC.



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






                                    SMITH & NEPHEW, INC.



                                    By:     /s/ B.J. Splan
                                            ---------------------
                                    Name:   B.J. Splan
                                    Title:  President
                                            Healthcare Division






                               [SIGNATURE PAGE TO
                  UNITED STATES SALES REPRESENTATIVE AGREEMENT]


                                       15
<PAGE>


 


                                    EXHIBIT A

                              CURRENT ARRANGEMENTS
                             IN CERTAIN TERRITORIES

Contract Term/   Contract Executed    Agency    Key Contact    General Territory
Change Notice



                                     [****]




- ------------
     [****]  REPRESENTS  MATERIAL WHICH HAS BEEN REDACTED  PURSUANT TO A REQUEST
FOR CONFIDENTIAL  TREATMENT PURSUANT TO RULE 24B-2 UNDER THE SECURITIES EXCHANGE
ACT OF 1934, AS AMENDED.
<PAGE>



                                    EXHIBIT B

                          PRICES, DISCOUNTS, ALLOWANCES
                                AND TERMS OF SALE


List Price

SAFHS(R)Model 2A   $2,950    (devices shipped prior to May 1997.  The Company
                             ceased selling the model 2A in the United States
                             in May 1997)

SAFHS 2000(R)      $3,500    (commenced commercial distribution in May 1997 in
                             the United States)


[****]


Standard Warranty and Return Policy


Attached is the Company's Service Agreement which outlines the Company's support
for the device while the patient is under treatment.



- ------------
     [****]  REPRESENTS  MATERIAL WHICH HAS BEEN REDACTED  PURSUANT TO A REQUEST
FOR CONFIDENTIAL  TREATMENT PURSUANT TO RULE 24B-2 UNDER THE SECURITIES EXCHANGE
ACT OF 1934, AS AMENDED.

<PAGE>
<TABLE>
<CAPTION>
<S>                                                                             <C>
Multi-Part Form - Press Hard/Use Ballpoint Pen                                  Please sign where "x" appears and date your
signature.

EXOGEN(R), INC.                                                                         Tel:  800-396-4325 & 732-981-0990
10 Constitution Ave., P.O. Box 6860, Piscataway, N.J. 08855, U.S.A.                     Fax:  800-836-5474
(I.R.S. Identification No. 22-3208468)
</TABLE>
- --------------------------------------------------------------------------------
                                SERVICE AGREEMENT

Dear  Patient:  Please  read  the  entire  Service  Agreement.  Record  the main
operating unit (MOU) serial number on the bottom of this form. The serial number
is located on the backside of the MOU.  Please sign both areas  indicated by "X"
and return the white copy in the enclosed  business reply envelope or fax a copy
to 800-836-5474. You should retain the yellow copy for your records.


Exogen, Inc. agrees to provide _______________________________________  ("USER")
with a SAFHS(R) treatment device subject to the following:

TERMS:  This  agreement  shall  become  effective  when signed by the User.  The
agreement  will  continue  until the  attending  physician  determines  that the
treatment is no longer necessary.  The User will then ship the equipment back to
Exogen following the instructions included in the device container. All shipping
charges will be paid by Exogen.

SERVICE  CHARGE:  The service charge for this treatment  service will be $3,500.
The User is  responsible  for the payment of the  service  charge and may assign
his/her  insurance  benefits to pay Exogen for the service  charge.  If the User
assigns his/her insurance  benefits to Exogen,  the User will remain responsible
for any co-payment or deductible insurance balance not paid by their insurer. If
payments are received from insurers  and/or the patient in excess of the service
charge, Exogen will refund the balance to the patient or appropriate third party
insurer.

THE EQUIPMENT:  The equipment is the sole property of Exogen, Inc. Exogen agrees
to  maintain  the  equipment  in proper  working  order at no charge to the User
except for those service costs that might result from improper use or accidental
damage to the equipment.

OBLIGATION OF THE USER:  Exogen is not prescribing a course of treatment for the
User.  The  company  merely  provides  instructions  for the  proper  use of the
equipment for whatever  indication is  prescribed by the  physician.  Exogen may
terminate  this  agreement  if the User  attempts,  or allows any other party to
attempt to make any unauthorized use,  inspection,  repair, or adjustment to, or
to make  available to any other party the content,  design,  or mechanism of the
equipment.  The User  understands  that the equipment is intended only for their
personal  use. The User agrees to handle and use the equipment  with  reasonable
care. CAUTION:  Federal law restricts this device to be used on the prescription
of a physician. Use is restricted to the individual for whom it is prescribed.

COLLECTING  MEDICAL  INFORMATION:  Exogen  is  required  by the  Food  and  Drug
Administration  (FDA)  to  collect  certain  patient,   fracture  and  physician
information and to maintain a registry and collect  follow-up data pertaining to
healing on all patients for whom SAFHS(R) therapy is prescribed. Confidentiality
of your records will be maintained and access will be limited to specific Exogen
clinical personnel and FDA employees as required.  You will not be identified by
name  at  any  time.  If you do  not  wish  to  allow  Exogen  to  collect  this
information,  please  check the  following  box.  |_| I will not allow Exogen to
collect information.
<PAGE>
MISCELLANEOUS:  This agreement cannot be assigned by the User but is enforceable
against  and binding on the User's  successors  and legal  representative.  This
agreement shall be governed by and construed in accordance with the internal law
of the State of New Jersey.


              USER SIGNATURE: X ________________________________________________
                                                          (User/Parent/Guardian)
              DATE: _______________

- --------------------------------------------------------------------------------
AUTHORIZATION  TO RELEASE  INFORMATION  AND ASSIGNMENT OF INSURANCE  BENEFITS TO
PROVIDER (EXOGEN, INC.)


I certify that the information given by me in applying for payment to my private
health insuring  organizations  and/or State Medical  Assistance  Program and/or
Federal  Government's  Medicare program is correct. I authorize the release,  to
Exogen and their  representatives,  of any medical or other information about me
which may be  required  for the  processing  and  payment of this claim with the
insuring organizations  (private,  State or Federal Government).  I request that
payment of  authorized  benefits be made on my behalf and I assign the  benefits
payable for the service  performed by Exogen  (service charge for the use of the
SAFHS(R)  treatment  device) to Exogen.  Although  I  recognize  that I have the
primary  responsibility  for  contacting  and  submitting  claims  to my  health
insurance  organization  (private,  State or Federal  Government),  I  authorize
Exogen to submit a claim to any of my insurers as may be required.

Although I may be covered by one or more insuring organizations (private,  State
or Federal  Government)  I hereby  personally  assume all amounts  owing for the
described  services  of Exogen  (described  in service  agreement  above).  This
includes  any  amounts not paid by the  insuring  organization.  For  outpatient
services,  I request  that this  authorization  apply for the  entire  treatment
period:


SIGNATURE OF INSURED PARTY:  X_______________________________ DATE:  ___________

- --------------------------------------------------------------------------------


DEVICE APPLICATION PERFORMED BY: ___________________________  DATE:  ___________


MOU SERIAL #:  ______________________________________________
(located on the back of the Main Operating Unit at the bottom of the label)
<PAGE>
                                    EXHIBIT C

                        POTENTIALLY TRANSFERRED EMPLOYEES

    Name (L, F, M)                    Volume %                        Units [a]

[****]                                   na                            [****]

[****]                                   16%                           [****]

[****]                                   7%                            [****]

[****]                                   8%                            [****]

[****]                                   9%                            [****]

[****]                                   9%                            [****]

[****]                                   6%                            [****]

[****]                                   na                            [****]

[****]                                   9%                            [****]

[****]                                   7%                            [****]

[****]                                   6%                            [****]

[****]                                   10%                           [****]

[****]                                   13%                           [****]

         Total                          100%                           [****]



- ------------
     [****]  REPRESENTS  MATERIAL WHICH HAS BEEN REDACTED  PURSUANT TO A REQUEST
FOR CONFIDENTIAL  TREATMENT PURSUANT TO RULE 24B-2 UNDER THE SECURITIES EXCHANGE
ACT OF 1934, AS AMENDED.
<PAGE>


                                    EXHIBIT D

                             [INTENTIONALLY OMITTED]


<PAGE>


                                    EXHIBIT E

                   FORM OF ASSIGNMENT AND ASSUMPTION AGREEMENT


<PAGE>
                       ASSIGNMENT AND ASSUMPTION AGREEMENT


                  This  Assignment and Assumption  Agreement  ("Assignment")  is
entered into this 10th day of August 1998, by and between Smith & Nephew,  Inc.,
a Delaware  corporation  ("Assignee"),  and Exogen, Inc., a Delaware corporation
("Assignor").

                                    RECITALS

                  WHEREAS,  Assignor and Assignee have entered into that certain
U.S.  Sales  Representative  Agreement,  dated the date  hereof  (the "Sales Rep
Agreement") by and between  Assignor and Assignee,  providing among other things
for the assignment by Assignor of the Distribution  Agreements listed on Exhibit
A to the Sales Rep Agreement)  (capitalized  terms used herein and not otherwise
defined  herein  shall  have the  meanings  given to such terms in the Sales Rep
Agreement);

                  NOW,  THEREFORE,  in consideration of the mutual covenants and
promises set forth herein, and for good and valuable consideration,  the receipt
and  sufficiency  of which is hereby  acknowledged,  the parties hereby agree as
follows:

                  1. Assignment and Assumption.  Assignor hereby assigns, sells,
conveys,  sets over,  transfers and delivers unto Assignee,  effective as of the
Initial Closing Date, and Assignee hereby accepts and assumes, all of Assignor's
right, title and interest in and to all the Distribution  Agreements.  Except as
set forth in Section 2(a) of the Sales Rep Agreement,  Assignee  hereby assumes,
agrees to pay,  perform and discharge when due, any liability or obligation with
respect to the Distribution  Agreements arising on and after the Initial Closing
Date.

                  2. Entire Agreement; Amendment. This Assignment, together with
the  Master  Agreement  and the  Sales Rep  Agreement,  constitutes  the  entire
agreement  and  understanding  between  the parties  hereto with  respect to the
matters set forth herein,  and supersedes and replaces any prior  agreements and
understandings,  whether oral or written, between and among them with respect to
such matters.  Neither this Agreement nor any provisions hereof may be modified,
amended or waived except by the written agreement of the parties hereto.

                  3.  Effect.  Notwithstanding  any  other  provisions  of  this
Assignment to the contrary,  nothing  contained in this Assignment  shall in any
way supersede,  modify,  replace, amend, change, rescind, waive, exceed, expand,
enlarge or in any way affect the provisions,  including  warranties,  covenants,
agreements,  conditions,  representations  or,  in  general  any of  rights  and
remedies,  and  any of the  obligations  and  indemnifications  of  Assignor  or
Assignee set forth in the Sales Rep Agreement or the Master  Agreement nor shall
this Assignment  expand or enlarge any remedies under the Sales Rep Agreement or
the Master Agreement  including without limitation any limits on indemnification
specified  therein.  This  Assignment is intended only to effect the transfer of
certain rights and obligations  transferred  pursuant to the Sales Rep Agreement
and shall be 
<PAGE>
governed  entirely in accordance  with the terms and conditions of the Sales Rep
Agreement and the Master Agreement.

                  4. Additional  Documents and Further Assurances.  From time to
time after the date hereof,  Assignor  will  execute and  deliver,  or cause its
affiliates  to execute  and  deliver,  to  Assignee  such  instruments  of sale,
transfer,  conveyance,  assignment and delivery, and such consents,  assurances,
powers of attorney  and other  instruments  as may be  reasonably  requested  by
Assignee  or its  counsel  in order to vest in  Assignee  all  right,  title and
interest of Assignor in and to the  Distribution  Agreements  and  otherwise  in
order to carry out the purpose and intent of this Assignment.

                  5.  Governing  Law. This  Assignment  shall in all respects be
construed in  accordance  with and governed by the laws of the State of Delaware
without  giving  effect  to its  conflicts-of-laws  principles  (other  than any
provisions thereof validating the choice of the laws of the State of Delaware in
the governing law).

                  6. Counterparts.  This Agreement may be executed in any number
of counter parts and by different parties hereto in separate counterparts,  each
of which when so  executed  shall be deemed to be an  original  and all of which
taken together shall constitute but one and the same agreement.

                           [SIGNATURE PAGE TO FOLLOW]

                                       2
<PAGE>




                  IN WITNESS WHEREOF,  the parties have executed this Assignment
as of the day and year first written above.


                                    Exogen, Inc.


                                    By: /s/ Patrick A. McBrayer
                                        -----------------------
                                    Name: Patrick A. McBrayer
                                    Title: President and Chief Executive Officer
                                    Address:  10 Constitution Avenue
                                              P.O. Box 6860
                                              Piscataway, NJ 08855
                                   Facsimile Number: (732) 981-0648
      

                                   Smith & Nephew, Inc.


                                   By: /s/ B.J. Splan
                                       ------------------------
                                   Name: B.J. Splan
                                   Title: President, Healthcare Division
                                   Address:  1450 Brooks Road.
                                             Memphis, TN 38116
                                   Facsimile Number: (901) 396-7824




<PAGE>

 
                                                                   EXHIBIT 10.25
                                          CONFIDENTIAL TREATMENT HAS BEEN SOUGHT
                                        FOR PORTIONS OF THIS EXHIBIT PURSUANT TO
                                        RULE 24B-2 UNDER THE SECURITIES EXCHANGE
                                                       ACT OF 1934, AS  AMENDED.



                                LICENSE AGREEMENT



         THIS AGREEMENT is made this 10th day of August,  1998,  between Exogen,
Inc., a Delaware corporation having an office located at 10 Constitution Avenue,
Piscataway,  NJ  08855  ("Exogen"),   and  Smith  &  Nephew,  Inc.,  a  Delaware
corporation  acting  on  behalf  of its  Orthopaedic  Division  having an office
located at 1450 Brooks Rd., Memphis, TN 38116 ("S&N").

                                P R E A M B L E :



         WHEREAS,  S&N and  Exogen are  concurrently  herewith  entering  into a
Master  Agreement  ("Master  Agreement"),  United  States  Sales  Representative
Agreement  ("Sales  Rep  Agreement")  and other  agreements  relating to certain
products that are covered by intellectual property owned by Exogen; and

         WHEREAS,  S&N seeks to obtain  and  Exogen has agreed to grant to S&N a
license under such intellectual property;

         NOW,  THEREFORE,  in consideration  of the mutual  covenants  contained
herein, the parties agree as follows:

1. DEFINITIONS

         1.1.  "Affiliates"  has the meaning ascribed to such term in the Master
Agreement.

         1.2.  "Intellectual  Property" as used in this Agreement shall mean all
intellectual property owned by Exogen relating to "Products" (as defined below),
including  the  patents,   patent  applications,   trademark  registrations  and
trademark  applications set forth in the attached  Appendix A, together with all
patent  applications or patents that are  continuations,  continuations-in-part,
divisional applications,  reissues, extensions, or foreign counterparts thereof.
The parties agree to supplement Appendix A in order to identify all intellectual
property in all Territories covered by a Sales Rep/Distribution Agreement.

         1.3. "Territory" and "Territories" shall mean any area in which S&N has
a Sales Rep/Distribution Agreement.

         1.4. "Products" shall have the same meaning as ascribed to such term in
the applicable Sales Rep/Distribution Agreement.
<PAGE>
         1.5 "Sales  Rep/Distribution  Agreement"  shall mean the Rep Agreement,
U.S. Stocking Distribution Agreement,  Global Stocking Distribution Agreement or
Individual Country Stocking Distribution Agreement (as such terms are defined in
the Master Agreement).

2. GRANT OF LICENSE

         2.1.  Exogen  hereby grants to S&N and its  Affiliates a  royalty-free,
nonexclusive  right and license under the Intellectual  Property to use and sell
the Products within the Territory and to sublicense others to so do for the term
of this  Agreement  subject to the terms and conditions of this  Agreement.  The
parties acknowledge that the consideration paid by S&N to Exogen pursuant to the
Master  Agreement  at the Initial  Closing (as defined in the Master  Agreement)
shall serve as the consideration for this Agreement.

         2.2.  Exogen  hereby  grants  to S&N and its  Affiliates  an  exclusive
(except as to third party second source  vendors of Exogen  authorized  to, from
time to time, and capable of, manufacturing the Products ( each referred to as a
"Manufacturer"))   right  and  license  under  the   Intellectual   Property  to
manufacture or have manufactured the Products and to sublicense others to so do,
in the United States and in such other  territories as to which S&N then has the
right to distribute or sell Products for the term of this  Agreement  subject to
the terms and  conditions  of this  Agreement.  Provided,  however,  S&N and its
Affiliates  shall  be  permitted  to  manufacture  or to have  manufactured  the
Products  pursuant to this  subsection only in the event Exogen fails to provide
or  supply  Products  in  accordance  with  the  requirements  of the  Sales/Rep
Distribution Agreement.  S&N may begin such manufacturing commencing on the last
day of the cure period  provided for in the  applicable  Sales/Rep  Distribution
Agreement and ending on the date upon which Exogen resumes supplying Products to
S&N  in  accordance  with  the  applicable  Sales/Rep   Distribution   Agreement
("Manufacturing Term"). Exogen shall provide S&N with written notice of Exogen's
intent to resume supplying  Products at least thirty (30) days prior to shipment
of the Products.  S&N shall be permitted to fill orders that have been submitted
to S&N during the Manufacturing Term. During the term of this Agreement,  Exogen
shall  maintain  one or  more  Manufacturers  with  all  information,  material,
technology,  rights and know-how  required to manufacture  the finished  Product
which  is  ready  for  marketing  in the  Territory  and  otherwise  enable  the
Manufacturer to manufacture Products. Exogen shall assign or transfer to S&N, to
the extent assignable, all contracts (or portions thereof) and rights Exogen has
with the  Manufacturer  with respect to the Products and otherwise assist S&N in
procuring Products from the Manufacturer.  S&N shall not be obligated to satisfy
any obligation owed by Exogen to the Manufacturer. If the Manufacturer is unable
or  unwilling  to provide  Products to S&N,  Exogen  shall  provide S&N with all
information,  materials, technology, rights and know-how required to manufacture
the finished  Products ready for marketing in the  Territory.  At the end of the
Manufacturing  Term  or upon  the  expiration  or  earlier  termination  of this
Agreement,  S&N shall reassign and retransfer the documents and rights set forth
in this section.  The parties  acknowledge that the consideration paid by S&N to
Exogen  pursuant to the Master  Agreement at the Initial  Closing (as defined in
the Master Agreement) together with the "Royalty" (as defined below) shall serve
as the  consideration  for this  Agreement.  S&N  shall  pay  Exogen  a  royalty
("Royalty")  equal  to  [****]  of the  Net  Sales  (as  defined  in  the  Sales
Rep/Distribution  Agreement) of Products manufactured by the Manufacturer or S&N
during the Manufacturing Term; provided,  however, S&N shall not be obligated to
pay a Royalty on Net

- ------------------------------------
[****]      REPRESENTS  MATERIAL  WHICH HAS BEEN REDACTED  PURSUANT TO A REQUEST
            FOR  CONFIDENTIAL   TREATMENT  PURSUANT  TO  RULE  24B-2  UNDER  THE
            SECURITIES EXCHANGE ACT OF 1934, AS AMENDED.

                                      -2-
<PAGE>
Sales of Products  sold by S&N under the Sales  Rep/Distribution  Agreement  and
manufactured  under this  License  for a term  equivalent  to the period of time
commencing on the date upon which S&N provides a notice of default to Exogen and
ending on the date upon which S&N first receives  Products from  Manufacturer or
S&N manufacturers  Products.  The Royalty shall be paid quarterly within 45 days
after the end of each quarter. S&N shall keep and maintain detailed and accurate
books and  records  with  regard to Net Sales of  Products  and the  calculation
thereof.  Exogen  shall be  entitled  to review and audit such books and records
from time to time during normal business hours upon reasonable notice to S&N and
at Exogen's  expense for the sole  purpose of  determining  the  accuracy of the
Royalty  payment  calculation.  S&N  shall  remit to  Exogen  the  amount of any
underpayment and interest thereon calculated at the rate of one percent (1%) per
month,  calculated  from the dates that the relevant  payments  should have been
made. 

         2.3.  Exogen  and S&N (or its  relevant  Affiliates)  shall  execute  a
license or  licenses  in such other  form or forms as may be  necessary  to give
effect to this  Agreement in any country  where such is required to conform with
the laws of any such  country in respect of the  Intellectual  Property and such
license or  licenses  shall be subject to all the terms and  conditions  of this
Agreement.

         2.4. All rights and licenses granted by Exogen to S&N under or pursuant
to this  Agreement are and shall  otherwise be deemed to be, for the purposes of
Section 365(n) of the United States  Bankruptcy  Code (the  "Bankruptcy  Code"),
licenses or rights to "intellectual  property" as defined under Section 101(35A)
of the Bankruptcy Code or a  "supplementary  agreement" (as that term is used in
the  Bankruptcy  Code) to such  licenses  and  grants of  intellectual  property
rights.  Without limiting any of the other rights granted to S&N hereunder,  all
of the rights of S&N and  obligations of Exogen  hereunder shall also apply from
the date a  bankruptcy  petition is filed by or against  Exogen to the date this
Agreement  is rejected;  it being the intent of the parties that this  Agreement
also  grants  S&N all of the  rights,  and  imposes  upon  Exogen and the Exogen
bankruptcy estate all of the obligations, referenced in Section 365(n)(4) of the
United States Bankruptcy Code.

3. MARKING

         If S&N  exercises  its rights  under  Section 2.2 of this  Agreement to
manufacture or have manufactured the Products,  S&N agrees that it will mark its
product with the  appropriate  patent number in accordance  with the patent laws
within the  Territory in which the Products are sold and will  otherwise  comply
with the FDA labeling,  product labeling and other  requirements of S&N pursuant
to the Master Agreement and the Sales Rep/Distribution Agreement.

4. TERM AND TERMINATION

         4.1.  The term of this  Agreement  shall  commence  upon the date first
above written. This Agreement shall continue in effect in a Territory as long as
the  Sales  Rep/Distribution  Agreement  is  effective  in that  Territory.  If,
however, the Sales Rep/Distribution Agreement 

                                      -3-
<PAGE>
terminates  for a  reason  other  than a  breach  by S&N,  then the term of this
Agreement  shall be for the remaining term  (including  renewal  options) of the
Sales Rep/Distribution Agreement if the same had not terminated.

         4.2. S&N shall have the right to terminate  this  Agreement at any time
and for any reason upon providing Exogen thirty (30) days' written notice of its
intention to terminate.

5.  NOTICES 

All notices under this  Agreement  shall be in writing and shall be deemed given
if delivered in accordance with the terms of the Master Agreement.

6. REPRESENTATIONS AND WARRANTIES

         6.1. Exogen warrants and represents that it has full right,  power, and
authority to enter into this Agreement and to license such Intellectual Property
to S&N.

         6.2. S&N warrants and  represents  that it has all requisite  right and
power to enter into this Agreement and perform its obligations hereunder.

         6.3.  Exogen  warrants  and  represents  that,  except  as set forth on
Schedule 8 to the Master Agreement,  the Intellectual Property is free and clear
of all liens, claims,  encumbrances and interests. Exogen shall not, without the
prior  written  approval  of  S&N,  which  approval  shall  not be  unreasonably
withheld, sell, transfer,  convey, pledge or otherwise encumber the Intellectual
Property  or any  Intellectual  Property  developed  in the future  relating  to
Products;  provided, however, that Exogen shall not be precluded from granting a
security  interest  in  substantially  all  of its  assets  in  connection  with
obtaining  a loan  or line of  credit  or  similar  financing  from  one or more
financial  institutions,  provided  Exogen  delivers  an  effective  and legally
binding  agreement  from the secured  party  wherein the secured party agrees to
subordinate  its  claims  and  interests  to  those  of S&N and not to  disturb,
terminate  or modify  any rights S&N may have with  respect to any  security  or
collateral if the secured party  exercises  rights with respect to such security
or collateral.

         6.4. Except as specifically  set forth in this Agreement,  Exogen makes
no  warranties  to S&N with  respect to the  Products  or any  services.  Exogen
disclaims all implied  warranties,  including  warranties of merchantability and
fitness for a particular purpose.

         6.5.  Neither  Exogen nor S&N shall in any event be liable for any loss
of profits, or for any special,  incidental or consequential damages arising out
of or in connection with the sale, use or performance of the Products.

7. SEVERABILITY

         If any  provision of this  Agreement  shall be determined by a court of
competent  jurisdiction to be unenforceable,  invalid or illegal for any reason,
the  other  provisions  shall be  equitably  modified  by the  parties  so as to
accomplish as closely as possible the original intent of the parties.

                                      -4-
<PAGE>
8. AMENDMENT AND WAIVER

         This Agreement may be amended only by an agreement in writing  executed
by both parties.  The failure of either party to require the  performance of any
term of this  Agreement,  or the waiver by either party of any breach under this
Agreement,  shall not prevent a subsequent enforcement of such term or be deemed
a waiver of any subsequent breach.

9. GOVERNING LAW

         This  Agreement  shall be governed by and construed in accordance  with
the laws of the state of Delaware.

10. ENTIRE AGREEMENT

         This  Agreement,  together  with the  agreements  referred  to  herein,
contains the entire  agreement of the parties with respect to the subject matter
hereof  and may not be  changed,  modified  or  rescinded  except  by a  written
instrument executed by all parties hereto.




                           [SIGNATURE PAGE TO FOLLOW]




                                      -5-
<PAGE>


         IN WITNESS WHEREOF,  the parties,  intending to be legally bound,  have
executed this Agreement as of the day and year first above written.


                                            EXOGEN, INC.



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




                                            SMITH & NEPHEW HOLDINGS, INC.



                                            By:  /s/ Larry W. Papasan
                                                 ---------------------
                                            Name:    Larry W. Papasan
                                            Title:   President
                                                     Orthopaedic Division





                                      -6-
<PAGE>
                                   APPENDIX A

                            U.S. AND FOREIGN PATENTS,
                           TRADEMARKS AND APPLICATIONS


(L) indicates license

<TABLE>
<CAPTION>
PATENTS
Index No.      Number        Country       Status      Issued (Filing)    Inventor(s)             Description
                                                             Date
Ultrasound
- ------------------------------------------------------------------------------------------------------------------------
<S>          <C>            <C>         <C>            <C>               <C>             <C>  
    1*       4530360        USA         Issued         7/23/85           Duarte          Method for Healing Bone
                                                                                         Fractures by Ultrasound
     2       5003965 /      USA         Issued         4/2/91            Talish /        Medical Device for Ultrasonic
             8042                                                        Lifshey         Treatment of Living Tissue
                                                                                         and/or Cells
    2A       1328485 /      Canada      Issued                           Talish /        Medical Device for Ultrasonic
             8042                                                        Lifshey         Treatment of Living Tissue
                                                                                         and/or Cells
     3       5186162 /      USA         Issued         2/16/93           Talish /        Ultrasonic Transducer Device
             0089                                                        Lifshey         for Treatment of Living
                                                                                         Tissues and/or Cells
     4       5211160 /      USA         Issued         5/18/93           Talish /        Ultrasound Orthopaedic
             0090                                                        Lifshey         Treatment Head and Body -
                                                                                         Mounting Means Therefor
     5       5520612 /      USA         Issued         5/28/96           Winder /        Acoustic System for Bone
             4031                                                        Talish / Ryaby  Fracture Therapy
    5A       Kokai #        Japan       Published      12/17/96          Winder /        Acoustic System for Bone
             8-332209                                                    Talish / Ryaby  Fracture Therapy
             601-11J
             (Cross
             Reference:
             Section 28)
    5B       080390 4031    Taiwan      Issued         8/11/96           Winder /        Acoustic System for Bone
                                                                         Talish et al    Fracture Therapy
     6       5556372 /      USA         Issued         9/17/96           Talish /        Apparatus for Ultrasonic Bone
             601-8                                                       Ryaby et al     Treatment (SAFHS 2000(R))
    6B       Pub.           EPO         Published      12/03/97          Talish /        Apparatus for Ultrasonic Bone
             #0-809-470                                                  Ryaby et al     Treatment (SAFHS 2000(R))
             601-8 PCT/EPO
</TABLE>
- -------------
* Patent Term  Extension  under 35 USC#156:  Filed 12/5/94;  Extension  received
5/31/96; term extension --5 years to 11/12/2007.

                                       -i-
<PAGE>
<TABLE>
<CAPTION>
Index No.      Number        Country       Status      Issued (Filing)    Inventor(s)             Description
                                                             Date
<S>          <C>            <C>         <C>            <C>               <C>             <C>           
    6F       Kokai          Japan       Published      9/17/96           Talish /        Acoustic System for Bone
             #8-238284                                                   Ryaby et al     Fracture Therapy
             601-8 Japan
     7       5626554 /      USA         Issued         5/6/97            Ryaby /         Gel Containment Structure
             601-4                                                       Talish /
                                                                         McCabe
     8       5755746        USA         Issued         5/26/98           Talish /        Locator Method & Apparatus
             601-3FWC                                                    Lifshey
    8B       Pub.           EPO         Published      12/12/97          Talish /        Locator Method & Apparatus
             #0-810-844                                                  Lifshey
             601-3 PCT/EPO
    8D       PCT/US95-1     China       Published      3/14/98           Talish /        Locator Method & Apparatus
             96742.I                    #CN-1175195A                     Lifshey
             601-3
             PCT/China
     9       5762616 601-7  USA         Issued         6/9/98            Talish          Apparatus for Ultrasonic
                                                                                         Treatment of Sites
                                                                                         Corresponding to the Torso
    9A       PCT/US97       PCT         Published      9/18/97           Talish          Apparatus for Ultrasonic
             WO97 / 33649                                                                Treatment of Sites
             601-7 PCT                                                                   Corresponding to the Torso
    11       D380440 601-9  USA         Issued         7/1/97            Talish /        Ultrasonic Transducer Housing
                                                                         Ryaby /         (Design Patent)
                                                                         Urgovitch
    11A      Reg. #         Japan       Registered     8/29/97           Talish /        Ultrasonic Transducer Housing
             998899 601-9J                                               Urgovitch /     (Japanese Design Patent)
                                                                         Scowen / Ryaby
    12*      5730705        USA         Issued         3/24/98           Talish /        Ultrasonic Treatment for Bony
             661905 601-13                                               Ryaby /         Ingrowth
                                                                         Tanzer / Bobyn
    25A      WO98 / 10729   PCT         Published      3/19/98           Talish          Cast Punch
             601-19 PCT
    28       Kokai          Japan       Published      (10/28/97)        Winder /        Acoustic System for Bone
             #9-276352                                                   Talish / Ryaby  Fracture Therapy
             601-47 PCT
             Japan
             (Cross-reference:
             Section 5A)
</TABLE>
- -------------
*Co-owned between Exogen, Inc. and inventors.

                                      -ii-


<PAGE>
<TABLE>
<CAPTION>
<S>          <C>            <C>         <C>            <C>               <C>             <C> 
Mechanical Strain
   2 (L)     5273028 /      USA         Issued         12/28/93          McLeod / Rubin  Non-Invasive Means for
             3009                                                                        In-Vivo Bone Growth
                                                                                         Stimulation
  2A (L)     183314         Mexico      Issued         5/23/93           McLeod / Rubin  Non-Invasive Means for
             1450-002                                                                    In-Vivo Bone Growth
                                                                                         Stimulation
  2C (L)     667113         Australia   Issued         5/26/93           McLeod / Rubin  Non-Invasive Means for
             2030/3009                                                                   In-Vivo Bone Growth
                                                                                         Stimulation
   3 (L)     5376065 3018   USA         Issued         12/27/94          McLeod / Rubin  Non-Invasive Method for
                                                                                         In-Vivo Bone Growth
                                                                                         Stimulation
   4 (L)     5103806 2025A  USA         Issued         4/14/92           McLeod / Rubin  Method for the Promotion of
                                                                                         Growth, Ingrowth & Healing of
                                                                                         Bone Tissue & Prevention of
                                                                                         Osteopenia by Mechanical
                                                                                         Loading of the Bone Tissue
   5 (L)     5191880 2025B  USA         Issued         3/9/93            McLeod / Rubin  Method for the Promotion of
                                                                                         Growth, Ingrowth & Healing of
                                                                                         Bone Tissue & Prevention of
                                                                                         Osteopenia by Mechanical
                                                                                         Loading of the Bone Tissue
Other
  1 (L)     4993413/        USA         Issued         2/19/91           McLeod /       Electromagnetic: Method and
            2032                                                         Rubin          Apparatus for Inducing a
                                                                                        Current and Voltage in Living
                                                                                        Tissue
    2       4719907         USA         Issued         1/19/88           Banko          Orthopedic Pin Placement Guide
            3.0-001




PATENT APPLICATIONS

Index No.       Number         Country       Status     Issued (Filing)    Inventor(s)             Description
                                                              Date

</TABLE>

                                     [****]

- ---------------
         [****]  REPRESENTS  MATERIAL  WHICH  HAS BEEN  REDACTED  PURSUANT  TO A
REQUEST FOR CONFIDENTIAL  TREATMENT  PURSUANT TO RULE 24B-2 UNDER THE SECURITIES
EXCHANGE ACT OF 1934, AS AMENDED.

                                      -iii-
<PAGE>
<TABLE>
<CAPTION>
TRADEMARKS

Index No.  Number            Country      Status        Issued (Filing)   Trademark
                                                        Date
<S>        <C>               <C>          <C>           <C>               <C>                   
    1      650974 10.1-002   USA          Registered    11/3/87           SAFHS(R)
   1A      7-112401 /        Japan        Listed        (10/31/95)        SAFHS(R)
           10.1-002J
   1B      548993 /          Canada       Registered    4/10/92           SAFHS(R)
           10.1-002C         Mexico
    2      74/530521         USA          Registered    7/11/95           EXOGEN(R)
           10.1-008
    3      720034 /          USA          Registered    7/16/96           SAFHS 2000(R)
           10.1-009
   3A      7 / 111521 /      Japan        Listed        (10/30/95)        SAFHS 2000(R)
           10.1-009J
<CAPTION>

TRADEMARK APPLICATIONS

Index No.  Number            Country      Status        Issued (Filing)   Trademark
<S>        <C>               <C>          <C>           <C>               <C>                   
                                                        Date
   2A      7-111520 /        Japan        Pending       (10/30/95)        EXOGEN(R)
           10.1-011J
   3A      7 / 111521 /      Mexico       Pending       (10/30/95)        SAFHS 2000(R)
           10.1-009J         Canada       Pending
    4      317,761 Exogen    USA          Pending       (7/1/97)          EXOGEN 2000(TM)
           10.-007
</TABLE>


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