EXOGEN INC
S-3, 1998-09-30
ELECTROMEDICAL & ELECTROTHERAPEUTIC APPARATUS
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   As filed with the Securities and Exchange Commission on September 30, 1998
                                                           Registration No. 333-

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

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                                    FORM S-3
                             REGISTRATION STATEMENT
                        UNDER THE SECURITIES ACT OF 1933

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                                  EXOGEN, INC.
             (Exact Name of Registrant as Specified in Its Charter)

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           DELAWARE                                             22-3208468
(State or Other Jurisdiction of                              (I.R.S. Employer
Incorporation or Organization)                            Identification Number)

                             10 Constitution Avenue
                          Piscataway, New Jersey 08855
                                 (732) 981-0990
               (Address, Including Zip Code, and Telephone Number,
        Including Area Code, of Registrant's Principal Executive Offices)

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                               Patrick A. McBrayer
                      President and Chief Executive Officer
                             10 Constitution Avenue
                          Piscataway, New Jersey 08855
                                 (732) 981-0990
            (Name, Address, Including Zip Code, and Telephone Number,
                   Including Area Code, of Agent for Service)

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

         Approximate  date of  commencement  of proposed sale to the public:  As
soon  as  practicable  on or  after  this  Registration  Statement  is  declared
effective.

         If the only securities  being registered on this form are being offered
pursuant to dividend or interest  reinvestment plans, please check the following
box. |_|
<PAGE>

         If any of the  securities  being  registered  on  this  form  are to be
offered  on a  delayed  or  continuous  basis  pursuant  to Rule 415  under  the
Securities Act of 1933,  other than  securities  offered only in connection with
dividend or interest reinvestment plans, check the following box. |X|

         If this form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list  the  Securities  Act  registration  statement  number  of the  earlier
effective registration statement for the same offering. |_|

         If this  Form is a  post-effective  amendment  filed  pursuant  to Rule
462(c) under the  Securities  Act,  please check the  following box and list the
Securities  Act  registration   statement   number  of  the  earlier   effective
registration statement for the same offering. |_|

         If delivery of the  prospectus  is expected to be made pursuant to Rule
434, please check the following box. |_|
<TABLE>
<CAPTION>
                                              CALCULATION OF REGISTRATION FEE
====================================================================================================================================
Title Of Each Class of         Amount To Be            Proposed Maximum          Proposed Maximum Aggregate         Amount of
Securities To Be                Registered        Offering Price Per Unit(1)         Offering Price(1)           Registration Fee
Registered
====================================================================================================================================
<S>                           <C>                          <C>                           <C>                         <C>    
Common Stock,
$.0001 par value              820,000 Shares               $3.1875                       $2,613,750                  $772.00
====================================================================================================================================
</TABLE>

(1)      Estimated  pursuant to Rule 457(c)  solely for the purpose of computing
         the  registration fee based upon the average of the high and low prices
         of the Common Stock,  as reported on The Nasdaq National Market as of a
         date  which  is  within  five   business  days  of  the  date  of  this
         Registration Statement.


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The Registrant hereby amends this  Registration  Statement on such date or dates
as may be necessary to delay its effective date until the Registrant  shall file
a further amendment which specifically  states that this Registration  Statement
shall  thereafter  become  effective  in  accordance  with  Section  8(a) of the
Securities  Act of  1933  or  until  the  Registration  Statement  shall  become
effective on such date as the Commission,  acting pursuant to said Section 8(a),
may determine.
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<PAGE>
PROSPECTUS
                                 820,000 Shares

                                  EXOGEN, INC.

                                  Common Stock


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         This  Prospectus  relates  to the public  offering,  which is not being
underwritten,  of up to 820,000  shares of Common  Stock,  par value  $.0001 per
share (the "Shares"),  of Exogen, Inc. ("Exogen" or the "Company").  All of such
Shares  are  currently  issued  and  outstanding  and are held by Smith & Nephew
Holdings,  Inc. (the "Selling  Stockholder")  and may be offered by such Selling
Stockholder.  The shares were  issued by the Company to the Selling  Stockholder
pursuant to a stock purchase agreement, dated August 10, 1998.

         The Shares may be offered by the Selling  Stockholder  or by  pledgees,
donees or  transferees  of, or other  successors  in  interest  to, the  Selling
Stockholder from time to time in transactions on The Nasdaq National Market,  in
negotiated  transactions,  or a  combination  of such methods of sale,  at fixed
prices which may be changed, at market prices prevailing at the time of sale, at
prices related to prevailing market prices or at negotiated  prices. The Selling
Stockholder  may effect such  transactions  by selling the Shares to one or more
purchasers   (including   pledgees)   or   through   broker-dealers,   and  such
broker-dealers may receive compensation in the form of discounts, concessions or
commissions from the Selling Stockholder and/or the purchasers of the Shares for
whom such  broker-dealers  may act as agents or to whom they sell as principals,
or both (which compensation as to a particular  broker-dealer might be less than
or in excess of  customary  commissions).  Neither  the  Company nor the Selling
Stockholder can presently estimate the amount of such compensation.  The Company
knows of no existing  arrangement  between the Selling Stockholder and any other
stockholder,  broker,  dealer,  underwriter  or  agent  relating  to the sale or
distribution  of the Shares.  The Selling  Stockholder  may  transfer its Shares
under certain  circumstances to other persons who may, in turn, resell Shares in
the manner described above. In addition,  the Selling  Stockholder may pledge or
make  gifts of its Shares and such  Shares may also be sold by the  pledgees  or
transferees.  To the extent required, the number of Shares being offered and the
terms of the offering,  including  the public  offering  price,  the name of the
Selling Stockholder and any underwriters,  dealers or agents, the purchase price
paid by any underwriter for the Shares purchased from Selling  Stockholder,  any
discounts,  commissions  and  other  items  constituting  compensation  from the
Selling  Stockholder  and any discounts,  commissions or concessions  allowed or
reallowed or paid to dealers with  respect to any  particular  offer will be set
forth in an accompanying  Prospectus  Supplement.  See "Selling Stockholder" and
"Plan of Distribution."

         None of the  proceeds  from  the  sale  of the  Shares  by the  Selling
Stockholder  will be  received  by the  Company.  The Company has agreed to bear
certain  expenses (other than selling  discounts and  commissions) in connection
with the  registration  of the Shares  pursuant to preexisting  agreements.  The
Company has agreed to  indemnify  the  Selling  Stockholder  and its  affiliates
against certain liabilities,  including  liabilities under the Securities Act of
1933, as amended (the "Securities  Act"). The Selling  Stockholder has agreed to
indemnify the Company and its affiliates against certain liabilities,  including
liabilities under the Securities Act under certain circumstances.
<PAGE>

   AN INVESTMENT IN THE SHARES OFFERED HEREBY INVOLVES A HIGH DEGREE OF RISK.
                     SEE "RISK FACTORS" BEGINNING ON PAGE 3.


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         The Common Stock of the Company is traded on The Nasdaq National Market
under the symbol "EXGN." The last reported  sales price of the Company's  Common
Stock on The Nasdaq National Market on September 29, 1998 was $3.125 per share.

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         The Selling Stockholder and any broker-dealers,  agents or underwriters
that participate with the Selling  Stockholder in the distribution of the Shares
may be deemed to be  "underwriters"  within the meaning of Section  2(11) of the
Securities  Act,  and any  commissions  received  by them and any  profit on the
resale  of the  Shares  purchased  by  them  may be  deemed  to be  underwriting
commissions or discounts  under the Securities  Act. See "Plan of  Distribution"
herein for a description of indemnification arrangements.


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  THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
       EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE
         SECURITIES AND EXCHANGE COMMISSION PASSED UPON THE ACCURACY OR
             ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE
                         CONTRARY IS A CRIMINAL OFFENSE.
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                The date of this Prospectus is September 30, 1998
<PAGE>
                              AVAILABLE INFORMATION

         The Company has filed with the Securities and Exchange  Commission (the
"Commission") a Registration Statement on Form S-3 under the Securities Act with
respect to the Common Stock offered hereby. This Prospectus does not contain all
of the information set forth in the Registration  Statement and the exhibits and
the schedules thereto.  For further  information with respect to the Company and
such Common Stock,  reference is made to the Registration Statement and exhibits
and  schedules  thereto.  Statements  contained  in  this  Prospectus  as to the
contents of any  contract  or other  document  referred  to are not  necessarily
complete,  and,  with  respect to any  contract  or other  document  filed as an
exhibit to the Registration  Statement,  each such statement is qualified in all
respects by reference to such exhibit.  Copies of the Registration Statement and
the  exhibits  thereto are on file at the offices of the  Commission  and may be
obtained upon payment of the prescribed fee or may be examined without charge at
the public reference facilities of the Commission described below.

         The Company is subject to the reporting  requirements of the Securities
Exchange  Act of 1934,  as  amended  (the  "Exchange  Act"),  and in  accordance
therewith  files  annual  and  quarterly  reports,  proxy  statements  and other
information  with the  Commission.  Such  reports,  proxy  statements  and other
information  may be inspected,  and copies of such material may be obtained upon
payment of the prescribed  fees, at the Commission's  Public Reference  Section,
Room 1024, 450 Fifth Street,  N.W.,  Washington  D.C.  20549,  the  Commission's
Regional  Offices at Seven World Trade  Center,  New York,  New York 10048,  and
Citicorp  Center,  500  West  Madison  Street,  Suite  1400,  Chicago,  Illinois
60661-2511, and the Commission's World Wide Web site at http://www.sec.gov.

         The  Common  Stock of the  Company  is  traded on The  Nasdaq  National
Market,  and in  accordance  therewith,  annual  and  quarterly  reports,  proxy
statements and other information  concerning the Company may be inspected at the
National  Association  of  Securities  Dealers,  Inc.,  at 1735 K Street,  N.W.,
Washington, D.C. 20006.

                INCORPORATION OF CERTAIN INFORMATION BY REFERENCE

         The  following   documents   filed  with  the   Commission  are  hereby
incorporated  by  reference  in this  Prospectus:  (i) the Annual  Report of the
Company on Form 10-K for the fiscal  year ended  September  30,  1997 (the "1997
Form  10-K"),  (ii) the  Quarterly  Report of the  Company  on Form 10-Q for the
period ended  December 31, 1997,  (iii) the  Quarterly  Report of the Company on
Form 10-Q for the period ended March 31, 1998, (iv) the Quarterly  Report of the
Company on Form 10-Q for the period ended June 30, 1998,  (v) the Current Report
of the Company on Form 8-K filed with the  Commission  on September 23, 1998 and
(vi) the description of the Common Stock contained in the Registration Statement
on Form 8-A filed with the  Commission  on May 26, 1995 under  Section 12 of the
Exchange Act.

         All  reports  and other  documents  subsequently  filed by the  Company
pursuant to Section 13(a), 13(c), 14 or 15(d) of the Exchange Act after the date
of this Prospectus and prior to the termination of this Offering shall be deemed
to be incorporated by reference  herein and to be a part hereof from the date of
filing of such reports and documents. Any statement incorporated herein shall be
deemed to be modified or  superseded  for  purposes  of this  Prospectus  to the
extent  that a statement  contained  herein or in any other  subsequently  filed
document  which  also is or is deemed to be  incorporated  by  reference  herein
modifies or supersedes such  statement.  Any statement so modified or superseded
shall not be deemed,  except as so modified or superseded,  to constitute a part
of this Prospectus.
<PAGE>
         The Company  will  provide  without  charge to each person to whom this
Prospectus is delivered,  upon written or oral request of such person, a copy of
any or all of the foregoing  documents  incorporated  herein by reference (other
than  exhibits  to  such  documents,   unless  such  exhibits  are  specifically
incorporated  by reference  into such  document).  Requests  for such  documents
should be submitted in writing to Chief  Financial  Officer,  Exogen,  Inc.,  10
Constitution Avenue, Piscataway, New Jersey 08855.


                                       2
<PAGE>
         An investment in the shares of Common Stock offered  hereby  involves a
high degree of risk and should not be made by any  investors  who cannot  afford
the loss of their entire  investment.  In  addition,  this  Prospectus  contains
certain statements of a forward-looking  nature relating to future events or the
future  financial   performance  of  the  Company.   Such  statements  are  only
predictions,  and the actual  events or results may differ  materially  from the
results  discussed  in  the  forward-looking   statements.  In  evaluating  such
statements and in making any investment decisions,  prospective investors should
specifically  consider  the  various  factors  identified  in  this  Prospectus,
including the matters set forth in the "Risk Factors" section below, which could
cause  actual  results  to  differ  materially  from  those  indicated  by  such
forward-looking statements. In addition, when used in this Prospectus, the words
"intends to," "believes,"  "anticipates,"  "expects" and similar expressions are
intended to identify forward-looking statements.

                                   THE COMPANY

         The Company was  incorporated  in New York on January 24, 1992, and was
reincorporated  in  Delaware  on  February  8,  1993.  The  Company's  principal
executive offices are located at 10 Constitution Avenue,  Piscataway, New Jersey
08855, and its telephone number is (732) 981-0990.

                                  RISK FACTORS

         In addition to the other information in this Prospectus,  the following
factors should be considered carefully in evaluating an investment in the shares
of Common Stock offered by this Prospectus.

Limited Operating History

         The Company has a limited  history of  operations  that,  to date,  has
consisted primarily of research and development, product engineering,  obtaining
approval  from the U.S. Food and Drug  Administration  ("FDA") for the Company's
SAFHS  device,  developing  the  Company's  sales  and  marketing  organization,
supervising  the  manufacture  of the SAFHS  device by a contract  manufacturer,
developing  in-house  manufacturing  capability,  and selling  its SAFHS  device
domestically  and  internationally.  The  Company  was formed for the purpose of
acquiring  the  SAFHS  technology  and  related  clinical  data,  as well as the
mechanical-stress  technology.  The Company has limited  direct  clinical  trial
experience.  The Company  received  approval of its Pre-Market  Approval ("PMA")
Application  for the SAFHS  Model 2A device  and began  marketing  it in October
1994, and further received approval of the SAFHS 2000 device and began marketing
the SAFHS 2000 in May 1997,  and therefore  has limited  experience in marketing
and selling its products in commercial  quantities.  The Company had no previous
direct manufacturing experience prior to commencing in-house refurbishing of its
SAFHS device in fiscal  1996.  Whether the Company can  successfully  manage the
transition to a larger-scale  commercial  enterprise will depend,  in part, upon
further  developing its distribution  network,  including its relationship  with
Smith  &  Nephew,  Inc.  ("S&N"),  an  affiliate  of  the  Selling  Stockholder;
successfully  developing its  manufacturing  capability;  and  strengthening its
financial and management systems, procedures, and controls. Failure to make such
a transition  successfully would have a material adverse effect on the Company's
business, financial condition, results of operations, and cash flows.
<PAGE>
Uncertainty of Market Potential and Market Acceptance

         The  Company's  SAFHS  device was  approved  by the FDA for  commercial
marketing in October 1994 to treat closed, cast-immobilized,  fresh fractures of
the tibia and distal radius within  approved  indications.  Since that time, the
Company has been engaged in efforts to gain  physician  acceptance  of the SAFHS
device and  reimbursement  coverage  for its use.  The market  potential  of the
Company's SAFHS device depends on the acceptance by the medical community of the
use of ultrasound  technology as a safe and effective  method of treating  fresh
fractures and the use of the Company's  SAFHS device by physicians for treatment
of these  fractures.  The SAFHS device is based upon new technology that had not
been used  previously to treat bone  fractures.  There can be no assurance  that
physicians will prescribe treatment using the SAFHS device. In addition,  use of
the  SAFHS  device  depends  significantly  on the  availability  and  extent of
third-party  reimbursement  (which has occurred  substantially on a case-by-case
basis),  increased  awareness of the effectiveness of the SAFHS technology,  and
focused sales efforts by the Company.  Electrical  stimulation devices, the only
other  non-invasive  devices  commercially  available  for the treatment of bone
fractures, have gained only limited physician acceptance to date. Failure of the
Company's  SAFHS  device to  achieve  market  acceptance  would  have a material
adverse  effect on the  Company's  business,  financial  condition,  results  of
operations, and cash flows.


                                       3
<PAGE>
Dependence on Third-Party Reimbursement

         Successful sales of SAFHS devices in the United States,  Europe, Japan,
and other countries  depend on the availability of adequate  reimbursement  from
third-party  payors such as managed care  organizations,  workers'  compensation
insurers, private insurance plans, and government entities. There is significant
uncertainty  concerning  third-party  reimbursement  for the use of any  medical
device incorporating new technology, such as the SAFHS device.  Reimbursement by
a  third-party  payor may depend on a number of factors,  including  the payor's
determination that the use of the SAFHS device is safe and effective,  medically
necessary,  appropriate  for  the  specific  patient,  cost-effective,  and  not
experimental  or  investigational.  In  addition,  devices  incorporating  a new
technology are often  prescribed by physicians for indications  other than those
approved by the FDA (off-label).  Reimbursement  for such off-label uses may not
be  available  or  permitted  by  government  regulations.  Since  reimbursement
approval is required from each payor  individually,  seeking such approvals is a
time-consuming   and  costly  process  that  requires  the  Company  to  provide
scientific  and  clinical  support for the use of the SAFHS device to each payor
separately.  In most cases,  in the United  States,  the  Company  has  received
reimbursement  approval from  third-party  payors only on a case-by-case  basis.
Currently,  third-party payors that have conducted technology assessments of the
SAFHS therapy,  and have established medical guidelines for its use, require the
Company, in most cases, to obtain preauthorization from these third-party payors
prior to providing the SAFHS devices to the patients.  There can be no assurance
that  third-party  reimbursement  will be  sufficiently  available for the SAFHS
device or any of the Company's  other products that may be developed,  that such
third-party  reimbursement will be adequate,  or that other third-party  payors,
including  Medicare,  will not  recommend  that the SAFHS  device not be covered
under their programs.

         In August 1996,  the Technology  Advisory  Committee of the Health Care
Financing  Administration  ("HCFA")  recommended  that the SAFHS  device  not be
covered under the Medicare program.  The Company,  however,  continues to pursue
coverage for SAFHS by providing additional information to the HCFA staff; in the
interim,  the Company is not shipping orders to patients covered under Medicare.
The  United  States   Congress  is  also   considering   various   proposals  to
significantly  reduce  Medicare and Medicaid  expenditures,  which, if they were
enacted  and if SAFHS were  covered  under  Medicare or  Medicaid,  could have a
material adverse effect on the Company's business,  financial condition, results
of operations, and cash flows. In addition,  third-party payors are increasingly
limiting  reimbursement coverage for medical devices, and in many instances have
put pressure on medical suppliers to lower their prices. The Company has limited
experience in obtaining  reimbursement  for its products in countries other than
the United States, and has obtained only limited reimbursement in Germany. There
is no assurance that the Company's efforts to obtain  reimbursement  approval in
Germany  and in  other  countries  will be  successful.  Lack  of or  inadequate
reimbursement  by governmental  and other  third-party  payors for the Company's
products  would  have a  material  adverse  effect  on the  Company's  business,
financial condition, results of operations, and cash flows.

History of Losses; Profitability Uncertain; Fluctuations in Operating Results

         The Company has incurred  substantial losses since inception and, as of
June 30, 1998, had an accumulated deficit of approximately  $40.9 million.  Such
losses have resulted  principally  from expenses  associated  with obtaining FDA
approval for the Company's  SAFHS device,  engineering  and developing the SAFHS
and  mechanical-stress  devices,  and  establishing  and expanding the sales and
<PAGE>
marketing organization and reimbursement  activities in the United States and in
Europe.  The Company expects to generate  substantial  additional  losses in the
future  primarily  attributable  to development of, and clinical trials for, the
mechanical-stress  device, clinical trials for expanded indications of the SAFHS
technology,  the  continued  expansion of domestic and  international  sales and
marketing activities,  and the expansion of in-house  manufacturing  capability.
Results of operations may fluctuate  significantly from quarter to quarter based
on such factors,  and will also depend upon reimbursement by third-party payors,
new  product  introductions  by  the  Company  or  its  competitors,  timing  of
regulatory actions, expenditures incurred in the research and development of new
products, and the mix of product sales between the United States and abroad. The
Company's future revenues and profitability are critically  dependent on whether
it can successfully market and sell its SAFHS device.  There can be no assurance
that significant revenues or profitability will ever be achieved.

Dependence on Principal Product

         Essentially  all of the  Company's  product  revenues to date have been
derived from sales of its SAFHS device. The SAFHS device is expected to continue
to account for substantially  all of the Company's  revenues for the foreseeable
future.  The Company's  long-term  success will depend in part on the successful
commercialization  of  the  SAFHS  device  for  its  approved  indications,  the
development  and  regulatory  approval  of SAFHS  devices  to  treat  additional
indications,  and the acceptance of the SAFHS treatment by the medical community
and third-party 


                                       4
<PAGE>
payors.  Failure to gain  market  acceptance  for the SAFHS  device or to obtain
adequate  reimbursement  coverage,  among other  factors,  would have a material
adverse  effect on the  Company's  business,  financial  condition,  results  of
operations, and cash flows.

Limited Sales and Marketing Experience

         The Company  began  marketing  the SAFHS device in the United States in
October 1994.  Because of limited market  awareness of SAFHS therapy,  the sales
effort is a lengthy process, which requires educating physicians and third-party
payors  regarding  the  clinical  benefits and  cost-effectiveness  of the SAFHS
technology,  assisting  patients in the  reimbursement  process,  and  providing
product  support to  patients.  On August 10, 1998,  the Company  entered into a
multi-year Master Agreement and a U.S. Sales Representative  Agreement with S&N,
under which S&N has obtained  exclusive  rights to market  SAFHS  devices in the
United  States.  As a result,  the  Company  is no longer  engaged in any direct
domestic sales activities related to its current products. S&N's sales personnel
do not have prior  experience in the sale or use of SAFHS devices,  although the
Company is providing  training and other  support to S&N's sales force under the
U.S.  Sales  Representative  Agreement.  There can be no assurance that S&N will
commit the necessary  resources to market the SAFHS device  effectively  or that
the  Company  and S&N will  succeed  in  their  efforts  to  promote  the  SAFHS
technology to physicians and third-party payors.

         The Company  markets  the SAFHS  device in several  European  countries
through  independent  distributors  and sales agents,  and has recorded sales in
Germany,  Austria, the Netherlands,  Denmark,  Switzerland,  Belgium, the United
Kingdom and Israel.  The Company  markets the SAFHS  device in Japan  through an
exclusive  distribution  agreement  with Teijin Limited  ("Teijin"),  a Japanese
corporation. Each of the foreign markets in which the Company sells, or plans to
sell, its products has its own regulatory  requirements  and approvals,  and the
distribution, price, and market structure to be established by the Company might
vary from country to country.  No assurance can be given that the Company or its
partners can  successfully  market the SAFHS  device in Europe or in Japan.  The
Master  Agreement  between  the  Company  and S&N grants S&N the  option,  under
certain  circumstances  and  subject to certain  outstanding  rights,  to obtain
exclusive distribution rights to the SAFHS devices worldwide (except for Japan).
There is no assurance  that S&N will  exercise this option or that the existence
of this option will not have a material adverse effect on the Company's  ability
to obtain and maintain  effective  distribution  arrangements  in  international
markets pending the exercise or expiration of this option.

         The  Company's  marketing  success in the United States and abroad will
depend on whether it can gain further  regulatory  approvals of its products and
whether  the  Company,  together  with S&N,  can  successfully  demonstrate  the
cost-effectiveness  of the Company's  products and further  develop direct sales
capability.   Failure  by  the  Company  to  successfully  market  its  products
domestically  and  internationally  would have a material  adverse effect on the
Company's business, financial condition, results of operations, and cash flows.

Risks Associated with International Operations

         The Company  established a subsidiary in Germany  during fiscal 1995 as
part of its strategy to  introduce  the SAFHS  device in Europe,  and  commenced
commercial  distribution  of the device in  certain  European  countries  during
fiscal 1996. Product sales in Europe, which were primarily derived from sales in
Germany, were 14% of total product sales in fiscal 1996, 18% in fiscal 1997, and
for the nine months ended June 30, 1998, were 5% of total product sales.
<PAGE>
         In the three  months  ended March 31,  1998,  the Company  recorded its
initial sales to Teijin,  its Japanese  distributor.  The Company is responsible
for  manufacturing and supplying SAFHS devices to Teijin for clinical trials and
sales in Japan,  while Teijin is  responsible  for complying with the regulatory
requirements and marketing and  distributing the SAFHS device in Japan.  Product
sales to Japan were 10% of total  product  sales for the nine months  ended June
30, 1998.

         Management  expects  international  revenues to represent a significant
percentage of total revenues.  The Company believes that its  profitability  and
continued growth will require  expansion of sales in foreign markets,  and so it
intends to continue to expand its operations outside the United States and enter
additional  international  markets,  which will require  significant  management
attention and financial  resources.  There can be no assurance  that the Company
will be able to achieve  market  acceptance  of its  products  in  international
markets or maintain or increase international market demand for its products.

         As of June 30, 1998, the balance in European accounts  receivable,  net
of  allowances  for returns and bad debt,  was $319,000.  The European  accounts
receivable  is primarily  derived  from sales in Germany,  where the 


                                       5
<PAGE>
Company has received  limited local  reimbursement  on a case-by-case  basis. To
assist the  collection of outstanding  claims and to expedite the  reimbursement
process on future  claims,  the  Company is seeking  nationwide  approval by the
National  Krankenkasse,  the  German  governing  organization  that  establishes
medical reimbursement policy for health-care  providers.  To this end, in August
1997 the Company  submitted a formal  application to the National  Krankenkasse.
The  application  process  includes a scientific  assessment and a reimbursement
assessment.  In May 1998, an article in a German medical  publication  indicated
that the  reviewing  body  recommended  to the German  Minister of Health not to
provide  national  reimbursement  for SAFHS therapy;  the Minister of Health has
accepted this  recommendation.  In the quarter ended March 31, 1998, the Company
recorded an $800,000  nonrecurring charge to operations to write down certain of
its European accounts receivable,  primarily in Germany, which exceeded 180 days
outstanding.  The nonrecurring  charge was precipitated by a recent German court
case,  unrelated  to the Company,  that  challenged a 1995 ruling upon which the
Company had  previously  relied,  and may reduce the  collectibility  of certain
accounts receivable in Germany.  The Company plans to seek an appeal or resubmit
its  application  with further  information.  Unless and until such  approval is
obtained,  the  Company  has  elected to sell SAFHS  devices in Europe only when
reimbursement  is  preapproved,  which has caused a downward  trend in  European
sales.  There can be no  assurance  that the  Company  will  ultimately  receive
nationwide  approval in any European  country on a timely basis, if at all. Lack
of European  approvals for the Company's  products could have a material adverse
effect on the  Company's  European  business,  financial  condition,  results of
operations, and cash flows.

         The  Company's   European   operations   are   denominated  in  foreign
currencies.  Management  can give no  assurances  that  changes in currency  and
exchange rates will not materially  affect the Company's  revenues,  costs, cash
flows,  and  business  practices  and plans.  Additional  risks  inherent in the
Company's international business activities generally include unexpected changes
in  regulatory  requirements,  tariffs  and  other  trade  barriers,  delays  in
receiving  payments on accounts  receivable  balances,  reimbursement  approvals
(both   government  and  private),   difficulties   in  managing   international
operations,  potentially adverse tax consequences,  restrictions on repatriation
of earnings,  and the burdens of complying  with a wide variety of foreign laws.
There can be no  assurances  that such factors will not have a material  adverse
effect on the Company's future international revenues and, consequently,  on the
Company's business, financial condition, results of operations, or cash flows.

Manufacturing and Related Risks

         The Company has  developed  in-house  refurbishing  capability  for the
SAFHS Model 2A device and in-house  manufacturing  capability for the SAFHS 2000
device. In addition,  the Company uses a contract  manufacturer to manufacture a
portion of the  Company's  SAFHS 2000  production.  Both the  Company's  and the
contract  manufacturer's  respective  facilities have been inspected by the FDA,
and have been  approved  for the  production  of the SAFHS  2000 under the FDA's
Quality  System  Regulations.  Any failure by either the Company or the contract
manufacturer  to maintain its respective  facility in accordance  with the FDA's
Good Manufacturing  Practices ("GMP") requirements could result in the inability
to  manufacture  the SAFHS  device on a  commercial  scale,  and could limit the
Company's  ability to deliver the SAFHS device to physicians or patients,  which
would  have a  material  adverse  effect on the  Company's  business,  financial
condition, results of operations, and cash flows.
<PAGE>
         Several components  incorporated in the SAFHS device currently are, and
will continue to be, manufactured by single-source vendors. For certain of these
components,  there  are  relatively  few  alternative  sources  of  supply,  and
establishing  additional or replacement  suppliers for such components cannot be
accomplished  quickly. Any supply interruption from single-source  vendors would
have a material adverse effect on the Company's business,  financial  condition,
results of operations, and cash flows.

Intense Competition and Risks Associated with Rapid Technological Change

         The medical device industry is  characterized  by intense  competition.
Many of the Company's  existing and  potential  competitors  have  substantially
greater financial,  marketing, sales, distribution, and technical resources than
the Company and more experience in research and  development,  clinical  trials,
regulatory matters,  manufacturing,  and marketing.  In addition,  most of these
companies  have  established  third-party   reimbursement  for  their  products.
Furthermore,  the medical  device  industry is  characterized  by rapid  product
development and technological  change.  The Company's products could be rendered
obsolete  or  uneconomical  by  technological  advances  by one or  more  of the
Company's  competitors or by other  therapies such as drugs to treat  conditions
addressed  by  the  Company's  products.   The  Company's  business,   financial
condition,  results of  operations,  and cash flows will depend upon whether the
Company can compete  effectively  with other  developers of such medical devices
and therapies.

         The   SAFHS   device    competes    with    non-invasive    bone-growth
electrical-stimulation   devices  and  with  various  surgical  treatments.  The
Company's mechanical-stress device to prevent bone loss related to osteoporosis,
if  

                                       6
<PAGE>
developed and marketed,  will compete with drug therapies and exercise regimens.
There can be no assurance  that such device will ever be developed,  approved by
the FDA, or become  commercially  available.  Four  companies  currently  market
electrical-stimulation   devices  for  the  treatment  of  non-union   fractures
(fractures that remain unhealed after nine months). The Company believes that at
least  one of these  companies  is  conducting  clinical  trials  for the use of
electrical stimulation for the treatment of fresh fractures. In addition,  other
companies are  developing a variety of products and  technologies  to be used in
the  treatment  of  fractures  and   osteoporosis,   including  growth  factors,
bone-graft substitutes, and exercise/physical therapy equipment. There can be no
assurance that  competitors  will not develop  products that are superior to the
Company's products,  achieve greater market acceptance,  or render the Company's
technology and products obsolete or  noncompetitive.  As a result, the Company's
long-term  viability  may  depend on  whether it can  continue  to  develop  new
products.  There can be no  assurance  that the Company  will be able to compete
successfully  against current or future competitors or that competition will not
have a material adverse effect on the Company's business,  financial  condition,
results of operations, or cash flows.

Extensive Government Regulation

         The  manufacture  and sale of medical  devices are subject to extensive
government  regulation in the United States and in other countries.  The process
of obtaining FDA and other required regulatory  approvals can be time-consuming,
expensive,  and uncertain,  frequently  requiring  several years from commencing
clinical trials to receiving  regulatory  approval.  For example, the process of
conducting  clinical  trials and  obtaining  the PMA for the SAFHS Model 2A took
nine years.  The Company is required to file PMA supplements for new or expanded
indications for its SAFHS  technology.  In addition,  modifications to its SAFHS
devices may require PMA  supplements.  If a supplement  were not accepted by the
FDA,  the Company  would be required to  undertake  and  complete the entire PMA
process  in  order  to use  future  SAFHS  devices  to  treat  those  additional
indications or commercialize a modified  device.  There can be no assurance that
the Company will obtain any such  approvals on a timely basis,  or at all, which
could  have a  material  adverse  effect on the  Company's  business,  financial
condition, results of operations, and cash flows.

         The Company filed a PMA Supplement for its second-generation SAFHS, the
SAFHS  2000,  in  December  1995,  and in  March  1997,  the FDA  approved  this
supplement.  In May 1997, the Company commenced  commercial  distribution of the
SAFHS  2000  in the  United  States.  In  June  1997,  the  Company  filed a PMA
Supplement  seeking  approval of an expanded  indication for the SAFHS 2000, but
withdrew  that  application  in July 1997 to  revise  and  resubmit  it for both
expanded and new  applications.  The Company  filed this  Supplement  during the
fourth  quarter of fiscal 1998. No assurance can be given that this  application
will be  accepted  or that a PMA or a  supplement  to an  existing  PMA  will be
granted on a timely  basis,  or at all.  In order for the  Company to market the
SAFHS  device  or any  future  products  in  foreign  jurisdictions,  it will be
required to seek regulatory approvals in those  jurisdictions.  No assurance can
be given that the Company can obtain  required  regulatory  approvals in foreign
countries on a timely basis, or at all.

         Regulatory approvals,  if granted, may include significant  limitations
on the  indicated  uses for which a product  may be  marketed.  FDA  enforcement
policy  strictly  prohibits  the  promotion  by  the  Company  and  any  of  its
distributors of approved  medical  devices for off-label  uses.  There can be no
assurance that the Company will not become subject to FDA actions as a result of
physicians'  prescribing  the SAFHS  device for  off-label  uses.  In  addition,
<PAGE>
product  approvals  may be  withdrawn  for  failure  to comply  with  regulatory
standards or the occurrence of unforeseen  problems following initial marketing.
The  Company  is  required  to  adhere  to FDA  regulations  setting  forth  GMP
requirements relating to tests,  control, and documentation.  Ongoing compliance
with GMP and other  applicable  regulatory  requirements  is  monitored  through
periodic  inspections by state and federal  agencies,  including the FDA, and by
comparable agencies in other countries. Failure to comply with applicable United
States and  international  regulatory  requirements can result in failure of the
relevant government agency to grant pre-market approval for devices,  withdrawal
of approval,  total or partial  suspension of  production,  fines,  injunctions,
civil  penalties,  recall or  seizure of  products,  and  criminal  prosecution.
Furthermore,  changes in existing  regulations or adoption of new regulations or
policies  could  prevent the Company  from  obtaining,  or affect the timing of,
future regulatory approvals or clearances.

         During  1996,  the Company  received  regulatory  approval of the SAFHS
Model 2A in Germany.  Under  German law,  medical  devices must have a "GS" mark
affixed to the product  labeling.  The GS mark,  which the  Company  received in
December 1995, denotes that the product meets certain safety standards. In 1996,
the Company also received the "CE" (Medical Device Directive) mark for the SAFHS
Model  2A,  and in  1998,  for the  SAFHS  2000.  The CE mark is  recognized  by
countries  that are members of the European  Union and the  European  Free Trade
Association,  and effective  June 1998,  the Company is required to affix the CE
mark to all its medical devices sold in the European Union.


                                       7
<PAGE>
         There  can be no  assurance  that the  Company  will be able to  obtain
necessary regulatory  approvals or clearances in the United States,  Europe, the
Pacific Rim, or elsewhere on a timely basis,  or at all. Delays in receipt of or
failure to receive such approvals or clearances, the loss of previously received
approvals or clearances, or failure to comply with existing or future regulatory
requirements  would have a material  adverse  effect on the Company's  business,
financial condition, results of operations, and cash flows.

Limited Protection of Patents, Copyrights and Proprietary Rights; Risk of Patent
Infringement

         The  Company  relies  on  a  combination  of  patents,  trade  secrets,
copyrights,   and   confidentiality   agreements  to  protect  its   proprietary
technology,  rights, and know-how.  No assurance can be given that the Company's
patent  applications  will issue as patents or that any issued  patents owned by
the Company will provide  competitive  advantages for the Company's  products or
will not be  successfully  challenged  or  circumvented  by  competitors.  Under
current law, patent  applications in the United States are maintained in secrecy
until  patents are issued,  and patent  applications  in foreign  countries  are
maintained in secrecy for a period after filing. The right to a device patent in
the United  States is  attributable  to the first to invent the device,  not the
first to file a patent application. Accordingly, the Company cannot be sure that
its products or technologies do not infringe  patents that may be granted in the
future  pursuant  to pending  patent  applications  or that its  products do not
infringe any patents or proprietary  rights of third parties.  In the event that
any relevant claims of third-party  patents are upheld as valid and enforceable,
the Company could be prevented from selling its products or could be required to
obtain  licenses  from the owners of such patents or be required to redesign its
products to avoid  infringement.  There can be no assurance  that such  licenses
would be  available  or,  if  available,  would be on  terms  acceptable  to the
Company,  or that the Company would be successful in any attempt to redesign its
products or processes to avoid  infringement.  The  Company's  failure to obtain
these licenses or to redesign its products would have a material  adverse effect
on the Company's business,  financial condition, results of operations, and cash
flows. The Company also relies on trade secrets and proprietary information, and
enters into  confidentiality  agreements  with its employees,  consultants,  and
advisors.  There  can be no  assurance  that the  obligations  to  maintain  the
confidentiality   of  such  trade  secrets  and  proprietary   information  will
effectively  prevent  disclosure of the Company's  confidential  information  or
provide  meaningful  protection  for the Company's  confidential  information if
there is unauthorized use or disclosure,  or that the Company's trade secrets or
proprietary  information  will not be  independently  developed by the Company's
competitors. The Company also holds rights to copyrights on text and on software
developed  by or for  itself  for  use  in its  SAFHS  device.  There  can be no
assurance  that any  copyrights  owned by the Company will  provide  competitive
advantages for the Company's  products or will not be challenged or circumvented
by its  competitors.  Litigation  may be necessary to defend  against  claims of
infringement,  to enforce  patents  and  copyrights  issued or  licensed  to the
Company,  or to protect trade secrets,  and could result in substantial cost to,
and  diversion  of effort by, the Company.  There can be no  assurance  that the
Company would prevail in any such litigation.

Uncertainty of New Product Development

         The Company plans to seek FDA approval to commence  clinical  trials in
the near future to expand the approved  indications for the SAFHS  technology to
include other fractures,  spine fusion,  and cartilage repair. In addition,  the
Company has developed a mechanical-stress device to prevent bone loss related to
osteoporosis.  The Company has  completed a pilot  clinical  trial in the United
<PAGE>
States,  and  anticipates  that it  will be  required  to  undertake  additional
development  activities  and human  clinical  trials before  seeking  regulatory
approval for this device.  There can be no assurance that the  mechanical-stress
device will prove to be safe and efficacious, that product development will ever
be  successfully  completed,  that a PMA, if applied for, will be granted by the
FDA  on a  timely  basis,  or  at  all,  that  adequate  levels  of  third-party
reimbursement will be available, or that the mechanical-stress  device will ever
achieve  commercial  acceptance.  The  Company's  inability to show  efficacy in
additional  applications of its SAFHS  technology,  to successfully  develop the
mechanical-stress   device,   or  to  achieve  market  acceptance  of  such  new
applications  and products would have a material adverse effect on the Company's
business, financial condition, results of operations, and cash flows.

Royalty Payment Obligations; Potential Loss of Exclusive License

         The Company is required to pay a royalty on any net revenues from sales
of the mechanical-stress  device, if such device is successfully  developed.  In
the  event  that  the  Company  does not  commercially  exploit  the  underlying
technology as required by the license agreement for such technology, the Company
will forfeit its exclusive license to the  mechanical-stress  technology.  There
can be no assurance that the Company will  commercially  exploit such technology
within the meaning of such license,  and  forfeiture of such  exclusive  license
could  have a  material  adverse  effect on the  Company's  business,  financial
condition, results of operations, and cash flows.


                                       8
<PAGE>
Product Liability and Insurance

         The  Company  faces an  inherent  business  risk of exposure to product
liability  claims in the event that the use of its  products  is alleged to have
resulted in adverse  effects.  There can be no assurance that  liability  claims
will not exceed the coverage limits of the Company's  insurance policies or that
such insurance will continue to be available on commercially  reasonable  terms,
or at all. Consequently,  product liability claims could have a material adverse
effect on the Company's business,  financial  condition,  results of operations,
and cash flows.

Reliance on Key Personnel

         The Company's success depends to a significant  extent upon a number of
key management and technical personnel.  The loss of the services of one or more
key employees  could have a material  adverse effect on the Company's  business,
financial  condition,  results of operations,  and cash flows.  The Company also
believes  that its future  success  will  depend in large part on whether it can
attract and retain highly skilled  technical,  management,  sales and marketing,
and  reimbursement  personnel.  Competition  for such personnel is intense,  and
there can be no assurance  that the Company will be successful in attracting and
retaining such  personnel.  The Company's  failure to attract,  hire, and retain
these personnel would have a material adverse effect on the Company's  business,
financial condition, results of operations, and cash flows.

Possible Volatility of Stock Price

         The trading  price of the  Company's  Common  Stock could be subject to
significant  fluctuations  in  response to  variations  in  quarterly  operating
results,  announcements  of  technological  innovations  or new  products by the
Company or its competitors,  changes in earning  estimates by analysts,  general
conditions  in the medical  device  industry,  and other  events or factors.  In
addition,  the stock market in general has experienced  extreme price and volume
fluctuations  that  have  affected  the  market  price  for  many  companies  in
industries  similar  or  related  to that of the  Company  and  that  have  been
unrelated  to  the  operating  performance  of  these  companies.  These  market
fluctuations  may  adversely  affect the market  price of the  Company's  Common
Stock.

Certain Anti-Takeover Provisions

         The Company's Second Amended and Restated  Certificate of Incorporation
grants the Board of Directors the  authority to issue up to 3,000,000  shares of
preferred  stock of the  Company,  $0.0001  par value per share (the  "Preferred
Stock"), in one or more series and to fix the rights,  preferences,  privileges,
and restrictions thereof,  including dividend rights, dividend rates, conversion
rights,  voting rights,  terms of  redemption,  redemption  prices,  liquidation
preferences, and the number of shares constituting any series or the designation
of such series,  without further vote or action by the  stockholders.  Effective
December  6, 1996,  pursuant to the Rights  Agreement,  the  Company's  Board of
Directors  declared  a  dividend  of  one  Right  to  purchase,   under  certain
circumstances, one one-hundredth share of the Company's Series A Preferred Stock
for each outstanding share of Common Stock of the Company.  Although the Company
has no present plans to issue any additional  shares of Preferred  Stock, it may
do so in the future.
<PAGE>
         The Company's  Bylaws specify  procedures  for director  nominations by
stockholders  and  the  submission  of  other  proposals  for  consideration  at
stockholder  meetings.  Certain  provisions  of Delaware law  applicable  to the
Company could also delay or make more difficult a merger, tender offer, or proxy
contest involving the Company, including Section 203, which prohibits a Delaware
corporation  from  engaging  in any  business  combination  with any  interested
stockholder  for a period of three years unless certain  conditions are met. The
possible  issuance of Preferred Stock  (including  pursuant to the Rights Plan),
the procedures required for director nominations and stockholder proposals,  and
Delaware  law could have the effect of  delaying,  deferring,  or  preventing  a
change in control of the Company,  including without limitation,  discouraging a
proxy contest,  making more difficult the acquisition of a substantial  block of
the  Company's  Common  Stock,  or limiting  the price that  investors  might be
willing to pay in the future for shares of the Company's Common Stock.

                                 USE OF PROCEEDS

         None of the  proceeds  from the sale of the Shares  will be received by
the Company.


                                       9
<PAGE>
                               SELLING STOCKHOLDER

         The  following  table sets  forth the number of shares of Common  Stock
beneficially  owned by the Selling  Stockholder  as of September  28, 1998.  The
Selling Stockholder has not had a material  relationship with the Company within
the past three  years  other than as a result of the  distribution  relationship
between  the  Company and S&N and the  Selling  Stockholder's  ownership  of the
Shares or other securities of the Company. The Shares offered by this Prospectus
may be  offered  from  time to time by the  Selling  Stockholder.  See  "Plan of
Distribution."
<TABLE>
<CAPTION>
                                                                                                Beneficial Ownership      
                                                                                                  After Offering(1) 
                                                     Number of Shares    Number of Shares   --------------------------    
                                                    Beneficially Owned    Registered for    Number of          
Name of Selling Stockholder                          Prior to Offering      Sale Hereby      Shares            Percent 
- ---------------------------                          -----------------      -----------      ------            ------- 
<S>                                                       <C>                  <C>            <C>                <C>   
Smith & Nephew Holdings, Inc................              820,000              820,000        --                 --
</TABLE>


(1)       The number of shares of Common Stock and the  percentage  of shares of
          Common Stock beneficially  owned by the Selling  Stockholder after the
          offering are based on the assumption that the Selling Stockholder will
          sell all of the Shares registered for sale hereby. Because the Selling
          Stockholder may offer all, some or none of the Shares pursuant to this
          Prospectus,   and  because   there  are   currently   no   agreements,
          arrangements or understandings  with respect to the sale of any of the
          Shares,  no estimate can be given as to the number of Shares that will
          be held by the Selling  Stockholder  after  completion  of the sale of
          Shares hereunder. See "Plan of Distribution."


         The Shares  registered  for sale  hereby  were  acquired by the Selling
Stockholder on August 10, 1998 in connection  with the execution of a multi-year
master  agreement and a U.S. sales  representative  agreement  under,  which S&N
obtained  exclusive rights to distribute SAFHS devices in the United States.  As
part of the transaction, the Selling Stockholder purchased 820,000 shares of the
Company's Common Stock for an aggregate purchase price of $4.1 million, or $5.00
per share.

         The Company has agreed to bear  certain  expenses  (other than  selling
discounts and commissions) in connection with the registration of the Shares.

         The  Company  has  agreed  to  prepare  and file  such  amendments  and
supplements  to the  Registration  Statement  as may be  necessary  to keep this
Registration  Statement  effective until the earlier of August 10, 2000 or until
all of the Shares have been sold pursuant to the terms hereof.

                              PLAN OF DISTRIBUTION

         The Shares  offered  hereby are being  offered  directly by the Selling
Stockholder  or by pledgees,  donees or transferees  of, or other  successors in
interest  to, the Selling  Stockholder.  The Company will not receive any of the
proceeds from the sale of the Shares by the Selling Stockholder. The sale of the
Shares  may be  effected  by the  Selling  Stockholder  from  time  to  time  in
<PAGE>
transactions on The Nasdaq National  Market,  in negotiated  transactions,  or a
combination  of such methods of sale,  at fixed prices which may be changed,  at
market prices  prevailing  at the time of sale, at prices  related to prevailing
market prices or at negotiated prices.  The Selling  Stockholder may effect such
transactions  by  selling  the  Shares  to one  or  more  purchasers  (including
pledgees)  or  through  broker-dealers,  and  such  broker-dealers  may  receive
compensation  in the form of  discounts,  concessions  or  commissions  from the
Selling   Stockholder  and/or  the  purchasers  of  the  Shares  for  whom  such
broker-dealers  may act as agents or to whom  they sell as  principals,  or both
(which  compensation as to a particular  broker-dealer  might be less than or in
excess  of  customary   commissions).   Neither  the  Company  nor  the  Selling
Stockholder can presently estimate the amount of such compensation.  The Company
knows of no existing  arrangement  between the Selling Stockholder and any other
stockholder,  broker,  dealer,  underwriter  or  agent  relating  to the sale or
distribution  of the Shares.  The Selling  Stockholder  may  transfer its Shares
under certain  circumstances to other persons who may, in turn, resell Shares in
the manner described above. In addition,  the Selling  Stockholder may pledge or
make  gifts of its Shares and such  Shares may also be sold by the  pledgees  or
transferees.  The  distribution  of the Shares may be effected in one or more of
the following  methods:  (i) ordinary brokers'  transactions,  which may include
long or short  sales;  (ii)  transactions  involving  cross or block  trades  or
otherwise on The Nasdaq National Market; (iii) purchases by brokers,  dealers or
underwriters  as principal and resale by such  purchasers for their own accounts
pursuant to this Prospectus; 

                                       10
<PAGE>
(iv) "at the market" to or through market makers or into an existing  market for
the Common Stock;  (v) in other ways not involving  market makers or established
trading markets,  including direct sales to purchasers or sales effected through
agents;  (vi)  through  transactions  in  options,  swaps or  other  derivatives
(whether  exchange-listed  or  otherwise);  or  (vii)  any  combination  of  the
foregoing,  or by any other legally  available  means. In addition,  the Selling
Stockholder  or its  successors in interest may enter into hedging  transactions
with  broker-dealers  who may  engage in short  sales of Shares in the course of
hedging the  positions  they assume  with the Selling  Stockholder.  The Selling
Stockholder  or its  successors  in interest may also enter into option or other
transactions   with   broker-dealers   that   require   the   delivery  by  such
broker-dealers of the Shares, in which Shares may be resold thereafter  pursuant
to this  Prospectus.  The Selling  Stockholder or its successors in interest may
also pledge  shares as collateral  for margin  accounts and such shares could be
resold pursuant to the terms of such accounts.

         At the  time a  particular  offer of  Shares  is  made,  to the  extent
required,  a Prospectus  Supplement will be distributed which will set forth the
number of Shares being offered and the terms of the offering  including the name
or names of any underwriters, dealers or agents.

         In order to comply  with the  securities  laws of  certain  states,  if
applicable,  the  Shares  will  be  sold  in  such  jurisdictions  only  through
registered or licensed  brokers or dealers.  In addition,  in certain states the
Shares may not be sold unless they have been registered or qualified for sale in
the applicable  state or an exemption  from the  registration  or  qualification
requirement  is  available  and is complied  with by the Company and the Selling
Stockholder.

         The Selling  Stockholder  may also transfer its Shares pursuant to Rule
144, whether or not the Registration Statement, of which this Prospectus forms a
part, is effective at the time of any such transfer.

         The Selling Stockholder and any broker-dealers,  agents or underwriters
that participate with the Selling  Stockholder in the distribution of the Shares
may be deemed to be  "underwriters"  within the meaning of Section  2(11) of the
Securities  Act,  and any  commissions  received  by them and any  profit on the
resale  of the  Shares  purchased  by  them  may be  deemed  to be  underwriting
commissions  or discounts  under the  Securities  Act. The Company has agreed to
indemnify  the  Selling   Stockholder   and  its  affiliates   against   certain
liabilities,  including  liabilities  under  the  Securities  Act.  The  Selling
Stockholder  has agreed to  indemnify  the  Company and its  affiliates  against
certain  liabilities,  including  liabilities  under  the  Securities  Act under
certain circumstances.

         Under  applicable  rules and  regulations  under the Exchange  Act, any
person engaged in the distribution of the Shares may not  simultaneously  engage
in market making  activities with respect to the Common Stock of the Company for
a period of two business days prior to the commencement of such distribution. In
addition and without  limiting the foregoing,  the Selling  Stockholder  will be
subject  to  applicable  provisions  of the  Exchange  Act  and  the  rules  and
regulations thereunder, including, without limitation, Rule 102 under Regulation
M, which provisions may limit the timing of purchases and sales of shares of the
Company's Common Stock by the Selling Stockholder.

         The Company has agreed to bear certain  expenses  (other than discounts
and selling commissions) in connection with the registration of the Shares.
<PAGE>
                                  LEGAL MATTERS

         The validity of the Shares  offered  hereby will be passed upon for the
Company  by  Brobeck,  Phleger &  Harrison  LLP,  New York,  New York.  Ellen B.
Corenswet,  a partner of Brobeck,  Phleger & Harrison  LLP, owns 2,000 shares of
Common Stock of the Company.

                                     EXPERTS

         The financial  statements and schedule  incorporated  by reference from
the Company's Annual Report on Form 10-K for the fiscal year ended September 30,
1997 in this  Prospectus and elsewhere in the  registration  statement have been
audited by Arthur Andersen LLP, independent public accountants,  as indicated in
their reports with respect  thereto and are included herein in reliance upon the
authority of said firm as experts in giving said reports.


                                       11
<PAGE>
         No person has been  authorized to give any  information  or to make any
representations other than those contained in this Prospectus in connection with
the  offering  made  hereby,   and  if  given  or  made,  such   information  or
representations  must  not be  relied  upon as  having  been  authorized  by the
Company, any Selling Stockholder or by any other person. Neither the delivery of
this  Prospectus nor any sale made  hereunder  shall,  under any  circumstances,
create any  implication  that the  information  herein is correct as of any time
subsequent to the date hereof.  This  Prospectus does not constitute an offer to
sell or a solicitation  of an offer to buy the Shares to any person or by anyone
in any  jurisdiction  in which such offer or  solicitation  may not  lawfully be
made.

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

                       Table of Contents
                                                                 Page
                                                                 ----

        Available Information..............................        2       
 
        Incorporation of Certain Information by 
         Reference.........................................        2       
 
        The Company........................................        3       
 
        Risk Factors.......................................                
 
        Use of Proceeds....................................        9       
 
        Selling Stockholder................................        10      

        Plan of Distribution...............................        10      

        Legal Matters......................................        11      

        Experts............................................        11    

  
<PAGE>
         
                                 820,000 Shares
                                      
                                      
                                      
                                      
                                      
                                  EXOGEN, INC.
                                      
                                      
                                      
                                      
                                      
                                  Common Stock
                                      
                                      
                                      
                                      
                                      
                                   PROSPECTUS
                                      
                                      
                                      
                                      
                                      
                               September 30, 1998

<PAGE>
                                     PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

Item 14.  Other Expenses of Issuance and Distribution

         The  following  table  sets forth an  estimate  of the  expenses  to be
incurred by the Company in connection with the issuance and  distribution of the
securities being registered:

                                                                     Amount to
                                                                      Be Paid
                                                                      -------

Registration Fee - SEC............................................    $  772
Nasdaq National Market Listing Fee................................    17,500
Legal Fees and Expenses...........................................    30,000
Accounting Fees and Expenses......................................    15,000
Miscellaneous.....................................................    16,728
Total.............................................................    80,000

Item 15.  Indemnification of Directors and Officers

         Section 145 of the Delaware General  Corporation Law authorizes a court
to award or a  corporation's  Board of  Directors  to grant  indemnification  to
directors   and   officers   in  terms   sufficiently   broad  to  permit   such
indemnification   under  certain   circumstances   for  liabilities   (including
reimbursement  for expenses  incurred) arising under the Securities Act of 1933,
as amended (the "Securities Act").  Articles 8 and 9 of the Registrant's  Second
Amended and Restated Certificate of Incorporation provide for indemnification of
its  directors  and officers and  permissible  indemnification  of employees and
other agents to the maximum extent permitted by the Delaware General Corporation
Law. The Selling  Stockholder  has agreed to indemnify  officers,  directors and
controlling  persons of the Registrant  against certain  liabilities,  including
liabilities  under the Securities Act under certain  circumstances.  The Company
has obtained liability insurance for its directors and officers.

Item 16.  Exhibits

         The following is a list of Exhibits  filed as part of the  Registration
Statement:

 4.1     Specimen  certificate  for  shares of the  Registrant's  Common  Stock,
         incorporated  herein  by  reference  to  Exhibit  4.1  to  Registration
         Statement No. 33-92740.
 4.2     Provisions  of the  Certificate  of  Incorporation  and  Bylaws  of the
         Registrant   defining   rights  of  holders  of  Common  Stock  of  the
         Registrant, incorporated herein by reference to Exhibits 3.2 and 3.3 to
         Registration Statement No. 33-92740.
 5.      Opinion and Consent of Brobeck, Phleger & Harrison LLP.
23.1     Consent of Arthur Andersen LLP, independent public accountants.
23.2     Consent of Brobeck,  Phleger & Harrison  LLP  (included  in the opinion
         filed as Exhibit 5).
24.      Powers of Attorney.
<PAGE>
Item 17.  Undertakings

         Insofar as indemnification for liabilities arising under the Securities
Act may be  permitted to  directors,  officers  and  controlling  persons of the
Registrant  pursuant to the foregoing  provisions,  Delaware General Corporation
Law,  the  Certificate  of  Incorporation,  the  Bylaws  of the  Registrant,  or
otherwise, the Registrant has been advised that in the opinion of the Securities
and Exchange  Commission  (the  "Commission")  such  indemnification  is against
public policy as expressed in the Act, and is, therefore,  unenforceable. In the
event that a claim for indemnification  against such liabilities (other than the
payment by the Registrant of expenses incurred or paid by a director, officer or
controlling  person of the Registrant in the  successful  defense of any action,
suit or proceeding) is asserted by such director,  officer or controlling person
in connection with the securities being registered,  the Registrant will, unless
in the opinion of counsel the matter has been settled by controlling  precedent,
submit  to a  court  of  appropriate  jurisdiction  the  question  whether  such
indemnification  by it is against  public policy as expressed in the  Securities
Act and will be governed by the final adjudication of such issue.

         The undersigned Registrant hereby undertakes:

         (1) To file, during any period in which offers or sales are being made,
a post-effective amendment to this registration statement.

             (i) To include any prospectus  required by Section  10(a)(3) of the
         Securities Act of 1933, as amended.

             (ii) To reflect in the prospectus any facts or events arising after
         the effective  date of the  registration  statement (or the most recent
         post-effective  amendment  thereof)  which,   individually  or  in  the
         aggregate,  represent a fundamental change in the information set forth
         in the  registration  statement.  Notwithstanding  the  foregoing,  any
         increase  or  decrease  in volume of  securities  offered (if the total
         dollar  value of  securities  offered  would not exceed  that which was
         registered) and any deviation from the low or high end of the estimated
         maximum offering range may be reflected in the form of prospectus filed
         with the Commission  pursuant to Rule 424(b) if, in the aggregate,  the
         changes in volume and price  represent no more than a 20 percent change
         in the maximum  aggregate  offering price set forth in the "Calculation
         of Registration Fee" table in the effective registration statement.

             (iii) To include any material  information with respect to the plan
         of distribution not previously disclosed in the registration  statement
         or  any  material  change  to  such  information  in  the  registration
         statement.

         (2) That, for the purpose of determining  any liability  under the Act,
each such  post-effective  amendment  shall be  deemed to be a new  registration
statement relating to the securities  offered therein,  and the offering of such
securities  at that time shall be deemed to be the  initial  bona fide  offering
thereof.

         (3) To remove from registration by means of a post-effective  amendment
any of the securities being registered which remain unsold at the termination of
the offering.

         The  undersigned  Registrant  hereby  undertakes  that, for purposes of
determining any liability under the Act, each filing of the Registrant's  annual
report pursuant to Section 13(a) or Section 15(d) of the Securities Exchange Act
of 1934, as amended (the "Exchange Act") (and, where applicable,  each filing of
<PAGE>
an employee  benefit  plan's  annual  report  pursuant  to Section  15(d) of the
Exchange Act) that is  incorporated by reference in the  registration  statement
shall be deemed to be a new  registration  statement  relating to the securities
offered  therein,  and the  offering  of such  securities  at that time shall be
deemed to be the initial bona fide offering thereof.

         The undersigned Registrant hereby undertakes that:

         (1) For  purposes  of  determining  any  liability  under the Act,  the
information  omitted  from  the  form  of  prospectus  filed  as  part  of  this
Registration  Statement  in reliance  upon Rule 430A and  contained in a form of
prospectus  filed by the registrant  pursuant to Rule 424(b)(1) or (4) or 497(h)
under  the  Securities  Act  shall  be  deemed  to be part of this  Registration
Statement as of the time it was declared effective.

         (2) For the purpose of determining  any liability  under the Securities
Act, each  post-effective  amendment that contains a form of prospectus shall be
deemed to be a new  registration  statement  relating to the securities  offered
therein,  and the offering of such securities at that time shall be deemed to be
the initial bona fide offering thereof.
<PAGE>

                                   SIGNATURES

         Pursuant to the requirements of the Securities Act of 1933, as amended,
the Registrant certifies that it has reasonable grounds to believe that it meets
all of the  requirements  for  filing  on  Form  S-3 and has  duly  caused  this
Registration Statement to be signed on its behalf by the undersigned,  thereunto
duly authorized,  in the City of Piscataway,  State of New Jersey,  on this 30th
day of September, 1998.

                                               EXOGEN, INC.


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

         Pursuant to the requirements of the Securities Act of 1933, as amended,
this  Registration  Statement  has been signed by the  following  persons in the
capacities indicated on September 30, 1998:

                  Signature

By:      /s/ John P. Ryaby
         -----------------
         John P. Ryaby, Chairman of the Board of Directors and Vice
         President of Research and Development and Regulatory Affairs


By:      /s/ Patrick A. McBrayer
         -----------------------
         Patrick A. McBrayer, Chief Executive Officer, President, and
         Director (Principal Executive Officer)


By:      /s/ Richard H. Reisner
         ----------------------
         Richard H. Reisner, Vice President, Chief Financial Officer,
         and Secretary (Principal Financial Officer and Principal
         Accounting Officer)


By:      *
         ---------------------
         Buzz Benson, Director


By:      *
         ---------------------------
         Donald J. Lothrop, Director

         *
By:      -------------------------
         Peter C. Madeja, Director

<PAGE>
By:      *
         ------------------------------------
         David J. Ottensmeyer, M.D., Director


By:      *
         -------------------------
         Terence D. Wall, Director


*By:     /s/ Patrick A. McBrayer
         -----------------------
         Patrick A. McBrayer
         Attorney-in-Fact

                                                                       EXHIBIT 5


                               September 30, 1998



Exogen, Inc.
10 Constitution Ave.
Piscataway, NJ 08855

                  Re:      Exogen, Inc. Registration Statement on Form S-3 for
                           820,000 Shares of Common Stock

Ladies and Gentlemen:

                  We  have  acted  as  counsel  to  Exogen,   Inc.,  a  Delaware
corporation (the "Company"),  in connection with the proposed  issuance and sale
by the  Company  of up to  820,000  shares of the  Company's  Common  Stock (the
"Shares")  pursuant to the  Company's  Registration  Statement  on Form S-3 (the
"Registration  Statement")  filed with the  Securities  and Exchange  Commission
under the Securities Act of 1933, as amended (the "Act").

                  This  opinion  is  being  furnished  in  accordance  with  the
requirements of Item 16 of Form S-3.

                  We have  reviewed  the  Company's  charter  documents  and the
corporate  proceedings  taken by the Company in connection with the issuance and
sale of the Shares.  Based on such review, we are of the opinion that the Shares
have been duly  authorized,  and if, as and when issued in  accordance  with the
Registration  Statement and the related  prospectus (as amended and supplemented
through  the  date  of  issuance)  will  be  legally  issued,   fully  paid  and
nonassessable.

                  We consent to the filing of this opinion letter as Exhibit 5.1
to the  Registration  Statement  and to the  reference  to this  firm  under the
caption  "Legal  Matters" in the  prospectus  which is part of the  Registration
Statement.  In giving this  consent,  we do not thereby admit that we are within
the category of persons  whose  consent is required  under Section 7 of the Act,
the rules and regulations of the Securities and Exchange Commission  promulgated
thereunder, or Item 509 of Regulation S-K.

                  This opinion  letter is rendered as of the date first  written
above and we  disclaim  any  obligation  to advise you of facts,  circumstances,
events or developments which hereafter may be brought to our attention and which
may  alter,  affect or modify  the  opinion  expressed  herein.  Our  opinion is
expressly  limited  to the  matters  set forth  above and we render no  opinion,
whether by  implication  or otherwise,  as to any other matters  relating to the
Company or the Shares.

                                                 Very truly yours,


                                              /s/BROBECK, PHLEGER & HARRISON LLP
                                              ----------------------------------
                                                 BROBECK, PHLEGER & HARRISON LLP

                                                                    EXHIBIT 23.1

                    CONSENT OF PUBLIC INDEPENDENT ACCOUNTANTS



         As   independent   public   accountants,   we  hereby  consent  to  the
incorporation by reference in this Form S-3 registration statement of our report
dated  November 3, 1997  (except  with  respect to the matter  discussed  in the
second paragraph of Note 15, as to which the date is November 14, 1997) included
in Exogen,  Inc.'s  Form 10-K for the year ended  September  30, 1997 and to all
references  to  our  firm  included  in or  made  a part  of  this  registration
statement.


                                                         /s/ Arthur Andersen LLP
                                                         -----------------------
                                                             ARTHUR ANDERSEN LLP

New York, New York
September 30, 1998

                                                                      EXHIBIT 24

                                POWER OF ATTORNEY

         We, the  undersigned  directors  and/or  officers of Exogen,  Inc. (the
"Company"),  hereby severally constitute and appoint Patrick A. McBrayer,  Chief
Executive Officer and President,  and Richard H. Reisner,  Vice President,  Vice
Chief Financial Officer and Secretary, and each of them individually,  with full
powers of substitution and resubstitution,  our true and lawful attorneys,  with
full  powers  to them and each of them to sign for us,  in our  names and in the
capacities  indicated below,  the Registration  Statement on Form S-3 filed with
the  Securities  and Exchange  Commission,  and any and all  amendments  to said
Registration   Statement   (including   post-effective   amendments),   and  any
registration statement filed pursuant to Rule 462(b) under the Securities Act of
1933, as amended,  in connection with the registration  under the Securities Act
of 1933, as amended,  of equity securities of the Company,  and to file or cause
to be  filed  the  same,  with all  exhibits  thereto  and  other  documents  in
connection therewith, with the Securities and Exchange Commission, granting unto
said  attorneys,  and each of them,  full power and  authority to do and perform
each and every act and thing  requisite  and  necessary to be done in connection
therewith,  as fully to all intents and  purposes as each of them might or could
do in person,  and hereby ratifying and confirming all that said attorneys,  and
each of them, or their  substitute or substitutes,  shall do or cause to be done
by virtue of this Power of Attorney.

         WITNESS our hands on this 30th day of September, 1998.


                                /s/ John P. Ryaby
- --------------------------------------------------------------------------------
                                  John P. Ryaby
                       Chairman of the Board of Directors
                         and Vice President of Research
                     and Development and Regulatory Affairs

                             /s/ Patrick A. McBrayer
- --------------------------------------------------------------------------------
                               Patrick A. McBrayer
                       Chief Executive Officer, President,
                   and Director (Principal Executive Officer)

                             /s/ Richard H. Reisner
- --------------------------------------------------------------------------------
                               Richard H. Reisner
                    Vice President, Chief Financial Officer,
                   and Secretary (Principal Financial Officer
                        and Principal Accounting Officer)

                                 /s/ Buzz Benson
- --------------------------------------------------------------------------------
                                   Buzz Benson
                                    Director
<PAGE>

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

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

                            /s/David J. Ottensmeyer
- --------------------------------------------------------------------------------
                           David J. Ottensmeyer, M.D.
                                    Director

                               /s/ Terence D. Wall
- --------------------------------------------------------------------------------
                                 Terence D. Wall
                                    Director
<PAGE>

                                 EXHIBIT INDEX

Exhibit   
  No.                               Description      
  ---                               -----------   
  
 4.1     Specimen  certificate  for  shares of the  Registrant's  Common  Stock,
         incorporated  herein  by  reference  to  Exhibit  4.1  to  Registration
         Statement No. 33-92740.

 4.2     Provisions  of the  Certificate  of  Incorporation  and  Bylaws  of the
         Registrant   defining   rights  of  holders  of  Common  Stock  of  the
         Registrant, incorporated herein by reference to Exhibits 3.2 and 3.3 to
         Registration Statement No. 33-92740.

 5.      Opinion and Consent of Brobeck, Phleger & Harrison LLP.

23.1     Consent of Arthur Andersen LLP, independent public accountants.

23.2     Consent of Brobeck,  Phleger & Harrison  LLP  (included  in the opinion
         filed as Exhibit 5).

24.      Powers of Attorney.



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