EXOGEN INC
S-3/A, 1999-03-16
ELECTROMEDICAL & ELECTROTHERAPEUTIC APPARATUS
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     As filed with the Securities and Exchange Commission on March 16, 1999
                                                      Registration No. 333-64881

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

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

                                 AMENDMENT NO. 2

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

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

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

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

              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)

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

                               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)

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

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

         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. |_|

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.
<PAGE>
PROSPECTUS
                                 820,000 Shares

                                  EXOGEN, INC.

                                  Common Stock


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


         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 Exogen  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  Exogen  nor  the  Selling
Stockholder can presently estimate the amount of such compensation. Exogen 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 Exogen.  Exogen  has  agreed to bear  certain
expenses (other than selling  discounts and  commissions) in connection with the
registration of the Shares pursuant to preexisting agreements. Exogen 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 Exogen
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.

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

         Exogen's Common Stock is traded on The Nasdaq National Market under the
symbol  "EXGN." The last  reported  sales price of Exogen's  Common Stock on The
Nasdaq National Market on March 15, 1999 was $2 1/2  per share.

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

         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.

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

  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.

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



                  The date of this Prospectus is March 16, 1999
<PAGE>
                              AVAILABLE INFORMATION

         Exogen 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 Exogen 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.

         Exogen 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.

         Exogen's Common Stock is traded on The Nasdaq National  Market,  and in
accordance therewith,  annual and quarterly reports,  proxy statements and other
information  concerning  Exogen 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 Exogen on
Form 10-K for the fiscal year ended  September 30, 1998, (ii) the Current Report
of Exogen on Form 8-K filed with the  Commission on October 19, 1998,  (iii) the
Quarterly  Report of Exogen on Form 10-Q filed with the  Commission  on February
12, 1999, (iv) 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, and (v) the  description  of the Preferred  Share  Purchase
Rights  contained  in the  Registration  Statement  on Form 8-A  filed  with the
Commission  on December 10, 1996 under Section 12 of the Exchange Act, as it may
be amended from time to time.

         All reports and other documents  subsequently  filed by Exogen 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>

         Exogen  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 Exogen.  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

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

         Exogen designs, develops, manufactures, and markets medical devices for
the  non-invasive  treatment of  musculoskeletal  injury and  disease.  Exogen's
proprietary  ultrasound and mechanical-stress  technologies delivery energy that
promotes the growth,  repair and  maintenance of bone.  These  technologies  are
based on the principle that bone growth is stimulated by mechanical force.

         Exogen's Sonic Accelerated  Fracture Healing System ("SAFHS(R)") device
utilizes mechanical force, produced by low-intensity  ultrasound,  to accelerate
fracture healing for closed, cast-immobilized,  fresh fractures of the lower leg
and lower arm within the device's  approved  uses. The SAFHS device is small and
portable,  and is  used by the  patient  once  daily  for 20  minutes.  Exogen's
Pre-Market Approval ("PMA") application for its first model, the SAFHS Model 2A,
was approved by the U.S. Food and Drug  Administration  ("FDA") in October 1994.
In May 1997, Exogen began commercial distribution of the second-generation SAFHS
2000(R)  in  the  United  States.  The  SAFHS  2000,  which  utilizes  the  same
low-intensity  ultrasound signal as does the SAFHS Model 2A, is entirely battery
operated  and is  smaller  and  lighter  than the  SAFHS  Model 2A for  enhanced
portability. The SAFHS device is the only medical device approved by the FDA for
the acceleration of fresh-fracture healing of the lower leg and lower arm.

                                  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.

History of Losses and Expectation of Continued Losses at Least Through 2000

         We have had a history of substantial net losses since our inception. We
incurred  net losses of $1.5  million for the three  months  ended  December 31,
1998, $7.6 million for the year ended September 30, 1998,  $11.2 million for the
year ended  September 30, 1997,  and $10.6 million for the year ended  September
30,  1996.  As of December  31,  1998,  we had an  accumulated  deficit of $43.4
million. The net losses we have incurred to date and the net losses we expect to
continue  to incur  for at least the next two  years  have  been due to  several
factors, including the following:
<PAGE>
            -  engineering   and   developing   the   SAFHS   device   and   the
               mechanical-stress device;
            -  conducting   clinical   trials   for   the   SAFHS   device   and
               mechanical-stress device;
            -  obtaining FDA approval of the SAFHS device;
            -  developing  and expanding our marketing,  sales and  distribution
               network domestically and internationally;
            -  expanding   our   reimbursement   activities   domestically   and
               internationally; and
            -  expanding in-house manufacturing capability.

         Although we have been  marketing  and selling  the SAFHS  device  since
1994,  we  are  still  experiencing   material  losses.  We  have  not  achieved
profitability,  and we expect to  continue  to incur  operating  losses at least
through 2000. Although our revenues have grown in recent quarters,  we cannot be
certain that we will achieve sufficient  revenues for profitability.  Our future
revenues  and  profitability,  if any,  are  critically  dependent on 

                                      -3-
<PAGE>
whether we successfully market and sell, and obtain reimbursement for, the SAFHS
device.  Even if we do achieve  profitability,  we cannot be certain that we can
sustain or increase profitability on a quarterly or annual basis in the future.

Substantial Dependence on the SAFHS Device; Uncertainty of Market Acceptance

         Our future growth depends  substantially  on the commercial  success of
the SAFHS device. Essentially all of our product revenues are derived from sales
of the SAFHS  device.  We expect the SAFHS  device to  continue  to account  for
substantially  all of our  product  revenues  for the  foreseeable  future.  Our
long-term success will depend on the following:

            -  successful  domestic and international  commercialization  of the
               SAFHS device for its approved uses,  including the ability of our
               exclusive  U.S.  distributor,  Smith &  Nephew,  to  successfully
               market the SAFHS device in the United States;
            -  whether  the  medical   community   will  accept  the  ultrasound
               technology of the SAFHS device as a safe and effective  method of
               treating fresh, bone fractures;
            -  whether third-party payors, including traditional fee-for-service
               insurers,  workers' compensation insurers, HMOs and other managed
               care    organizations,     automobile    insurers,    third-party
               administrators,  Medicare,  and other government  entities,  will
               provide third-party reimbursement of the SAFHS device; and
            -  development  and  regulatory  approval  of the SAFHS  device  for
               additional uses.

         If the market does not accept the SAFHS device, our business, financial
condition,  results  of  operations,  and  cash  flows  will be  materially  and
adversely affected.

Substantial Dependence on Smith & Nephew U.S. Distribution Arrangement

         Our future growth depends substantially on the ability of our exclusive
U.S. distributor, Smith & Nephew, to successfully market the SAFHS device in the
United States.  On August 10, 1998, Smith & Nephew acquired  exclusive rights to
market  the  SAFHS  device  in the  United  States,  under a  multi-year  master
agreement,  a  U.S.  sales  representative   agreement,  and  a  stock  purchase
agreement. As a result, we are no longer involved in any direct sales activities
relating  to the SAFHS  device in the United  States.  Although  the U.S.  sales
representative  agreement has a term of 10 years, it may be terminated by mutual
agreement  of Exogen and Smith & Nephew,  or by Smith & Nephew in the event of a
default by Exogen.

         We cannot assure you that Smith & Nephew will succeed in its efforts to
market the SAFHS  device.  Smith & Nephew's  sales  personnel  do not have prior
experience  in the sale or use of the SAFHS  device,  although we are  providing
them with training and other support. Although we believe that Smith & Nephew is
economically  motivated to succeed in performing its responsibilities  under the
agreements,  the  amount of  resources  and time  Smith & Nephew  devotes to its
responsibilities is not within our control, and therefore,  we cannot assure you
that Smith & Nephew  will  perform  its  obligations  as  expected.  If the U.S.
distribution  arrangement  with  Smith  &  Nephew  is not  successful  or if the
arrangement  is  terminated,  our  business,  financial  condition,  results  of
operations, and cash flows will be materially and adversely affected.
<PAGE>
Substantial  Dependence  on Third  Parties in Europe and Japan to Sell the SAFHS
Device

         We depend on  independent  distributors,  sales  agents,  and marketing
partners  to sell the SAFHS  device in  Europe,  Japan,  and other  territories.
Revenues derived from  international  sales of the SAFHS device  represented 12%
for the three months ended December 31, 1998,  19% for the year ended  September
30, 1998, 18% for the year ended  September 30, 1997, and 14% for the year ended
September 30, 1996.

         Through a subsidiary  in Germany,  we began  selling and  marketing the
SAFHS  device in Europe in  February  1996.  We also sell and  market  the SAFHS
device in Europe  through  independent  distributors  and sales agents.  We have
recorded sales in Germany, Austria, Holland, Denmark, Switzerland,  Belgium, the
United Kingdom,  and Israel.  Revenues derived from sales of the SAFHS device in
Europe  represented  7% for the three months ended December 31, 1998, 6% for the
year ended  September 30, 1998,  18% for the year ended  September 30, 1997, and
14% for the year ended September 30, 1996. Most of our sales of the SAFHS device
in Europe are derived from Germany, where we receive limited local reimbursement
only on a case-by-case  basis. Our European  accounts  receivable as of December
31, 1998,  net of allowances  for returns,  bad debt,  and amounts a third-party
payor might deduct from the price, was $289,000.



                                      -4-
<PAGE>
         In Japan,  we market and sell the SAFHS  device  through  an  exclusive
distribution  arrangement with Teijin Limited,  a Japanese  corporation.  We are
responsible  for  manufacturing  and  supplying  the SAFHS  device to Teijin for
clinical  trials and sales in Japan,  while Teijin is responsible  for obtaining
regulatory  approval  and for  marketing  and  distributing  the SAFHS device in
Japan.  In May 1998,  Teijin  announced that the Health and Welfare  Ministry of
Japan  had  approved  reimbursement  for the SAFHS  device,  which was the final
approval  they needed to begin  commercial  distribution  of the SAFHS device in
Japan. In June 1998, Teijin began commercial sales of the SAFHS device in Japan.
Revenues derived from sales of the SAFHS device to Teijin represented 5% for the
three months ended December 31, 1998, 13% for the year ended September 30, 1998.
Most of  Teijin's  purchases  of SAFHS  devices in fiscal  1998  represented  an
initial inventory build-up by Teijin to begin commercial  distribution in Japan,
primarily  in the second  half of the year.  Purchases  by Teijin in fiscal 1999
should be  principally  to restock the inventory  that Teijin  sells.  We do not
anticipate that any of Teijin's  quarterly  restocking  purchases will reach the
quarterly  volume achieved by Teijin's  initial  stocking of inventory in fiscal
1998.

         Under the distribution  arrangement with Smith & Nephew, Smith & Nephew
has an option  to  obtain  exclusive  distribution  rights  to the SAFHS  device
worldwide  (except  for  Japan).  We cannot  assure you that Smith & Nephew will
exercise its option to obtain worldwide (except for Japan)  distribution  rights
to the SAFHS device. We also cannot assure you that the existence of this option
will not  materially  and  adversely  affect our ability to  maintain  effective
distribution  arrangements  in  international  markets,  pending the exercise or
expiration of this option.

         We cannot assure you that our independent  distributors,  sales agents,
and marketing partners will succeed in marketing and selling the SAFHS device in
Europe,  Japan, and other  territories.  Each of the foreign markets in which we
sell,  or plan to sell,  our  products  have  separate  regulatory  and  product
approval  requirements.  We cannot assure you that we will be able to obtain the
necessary  regulatory  approvals of the SAFHS device in foreign markets.  If our
independent   distributors,   sales  agents,  and  marketing  partners  are  not
successful in marketing and selling the SAFHS device in Europe, Japan, and other
territories,  our business, financial condition, results of operations, and cash
flows could be materially and adversely affected.

Risks Associated with International Operations

         Our  international  operations  are  subject to other  inherent  risks,
including the following:

            -  fluctuations in currency exchange rates;
            -  regulatory and product approval requirements;
            -  tariffs and other trade barriers;
            -  greater difficulty in accounts  receivable  collection and longer
               collection periods;
            -  reimbursement    approvals   (both   government   and   private);
            -  difficulties   and  costs  of  staffing  and   managing   foreign
               operations and distributors;
            -  potentially  adverse tax  consequences;  
            -  reduced  protection  for  intellectual  property  rights  in some
               countries, including restrictions on repatriation of earnings;
            -  burdens of complying with a wide variety of foreign laws;
            -  the impact of recessions in economies  outside the United States;
               political and economic instability; and
            -  seasonal reductions in business activity during the summer months
               in Europe and other parts of the world.
<PAGE>
         In addition, our international  operations and sales are denominated in
local foreign currencies.  In Japan, where we do not have operations,  our sales
to  Teijin  are  denominated  in U.S.  dollars.  We do not  currently  engage in
currency hedging activities.

         If we  fail to  successfully  market  and  sell  the  SAFHS  device  in
international markets, our business, financial condition, results of operations,
and cash flows could be materially and adversely affected.

Quarterly Operating Results Are Subject to Significant Fluctuations

         Our revenues and operating results may vary  significantly from quarter
to quarter due to a number of factors,  not all of which are within our control.
These factors include the following:

                                      -5-
<PAGE>
          -  the success of our exclusive U.S. distributor, Smith & Nephew, in
             marketing the SAFHS device in the United States;
          -  the timing of sales of the SAFHS device;
          -  the mix of sales of the SAFHS  device in the  United  States  and
             Europe and to Japan; 
          -  the timing of reimbursement approval and payments by governmental
             authorities and third-party payors;
          -  new  product  introductions  by us or our  competitors; 
          -  expenses incurred in the research and development of new products;
          -  changes in our pricing policies or those of our competitors;
          -  timing  of  regulatory  actions;  
          -  general economic and market conditions;
          -  the  Asian  economic   crisis  and   instability;   and
          -  currency fluctuations.

         Our revenues for the foreseeable  future are almost entirely  dependent
on sales of the SAFHS device.  If revenues grow slower than we  anticipate,  our
business,  financial  condition,  results of operations,  and cash flows will be
materially and adversely affected.

Dependence on Third-Party Reimbursement

         Successful  sales of the SAFHS  device in the  United  States,  Europe,
Japan,  and other  territories  will  depend,  in part,  on  whether  we will be
reimbursed  by  third-party  payors,   including   traditional   fee-for-service
insurers,   workers'  compensation   insurers,   HMOs  and  other  managed  care
organizations,  automobile insurers,  third-party administrators,  Medicare, and
other  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.  Third-party  payors  are  increasingly
challenging  the  price  of  medical  devices,  and as a  result,  are  limiting
reimbursement  coverage for medical devices and, in many instances,  are putting
pressure on medical suppliers to lower their prices.  Legislative  bodies in the
United States and around the world  continue to propose  fundamental  reforms in
the health care  industry  that could  affect the  availability  of  third-party
reimbursement,  and  we  cannot  predict  the  timing  or  effect  of  any  such
legislation.

         United States.  We cannot assure you that costs associated with medical
devices  incorporating  new  technology,  such  as the  SAFHS  device,  will  be
reimbursed. To expedite reimbursement for SAFHS devices in the United States, we
seek reimbursement  approval from third-party  payors,  when possible,  prior to
shipping  the  devices.   Regardless  of  the   availability  of   reimbursement
preapproval,  our  reimbursement  staff works closely with  third-party  payors,
pursuing  reimbursement  case-by-case.  Prior to  approving  coverage  for a new
medical technology, most third-party payors require evidence that the technology
is safe and  effective,  not  experimental  or  investigational,  and  medically
necessary and appropriate for the specific patient. Third-party payors typically
require  that  the  technology  has  received  FDA  approval  or  clearance  for
marketing. Also, new technologies are often prescribed for uses other than those
approved  by the  FDA  (off-label  applications),  for  which  reimbursement  by
third-party  payors may not be available.  An increasing  number of  third-party
payors and managed care plans are also  beginning to require  evidence  that the
technology is cost effective.  We have obtained a nationally  recognized product
code for the ultrasound  device,  and this code may expedite  reimbursement from
third-party payors for the SAFHS device. However, we cannot assure you that such
codes will be utilized appropriately, or at all.
<PAGE>
         We  have  developed  a  multi-level  program  to  obtain  coverage  and
reimbursement  from third-party  payors for the SAFHS device as a new treatment.
The  SAFHS  device is  classified  by  third-party  payors  as  durable  medical
equipment.  Although we have not received broad approval from any  reimbursement
authority  for  payment of the SAFHS  device,  we have  received  approval  from
various third-party payors on a case-by-case basis.

         The Health Care Financing  Administration  ("HCFA"),  which administers
the Medicare program, has a national coverage policy for  electrical-stimulation
devices that initiate the healing of non-union fractures. In August 1996, HCFA's
Technology  Advisory Committee  recommended that the SAFHS device not be covered
under  the  Medicare  program.  The  committee's   recommendation  stated,  "The
available  data,  although  demonstrating  a reduction  in  physician-determined
healing time for the study population,  could not be generalized to the Medicare
population  in a way that would allow a  conclusion  that SAFHS was an effective
procedure."  Since that time,  we have  continued  to pursue  coverage for SAFHS
through  meetings with HCFA staff, and have provided  additional  support of the
clinical  benefits of the SAFHS therapy,  including  information  related to the
Medicare population.  In addition, we have been working with consultants and the
Health  Industry  Manufacturers  Association to pursue 


                                      -6-
<PAGE>
various  avenues to obtain Medicare  coverage for the SAFHS device.  To date, we
have been unable to change the Medicare noncoverage  decision;  however, we have
an ongoing dialogue with HCFA staff. The United States Congress has the power to
significantly reduce Medicare and Medicaid expenditures, and considers from time
to time proposals to reduce such  expenditures.  We cannot predict when Congress
may enact legislation reducing Medicare and Medicaid  expenditures,  and if such
legislation is enacted,  what effect,  if any, such  legislation may have on our
business, financial condition, results of operation and cash flows.

         We  cannot   assure  you  that  we  will  be  successful  in  obtaining
third-party  reimbursement from third-party payors,  including Medicare, or that
third-party payors will recommend that their programs cover the SAFHS device. If
we are unable to obtain adequate third-party reimbursement for the SAFHS device,
our business, financial condition, results of operations, and cash flows will be
materially and adversely affected.

         International.  Our international reimbursement plan varies by country.
In Germany,  Holland,  and France, we are using indigenous clinical data as well
as data collected in the United States on the  effectiveness of the SAFHS device
to support our filings for reimbursement coverage.

         The operating  loss for fiscal 1998  includes an $800,000  nonrecurring
charge, recorded in the three months ended March 31, 1998, to write down certain
international  accounts receivable - primarily in Germany that exceeded 180 days
outstanding. The nonrecurring charge was precipitated by a German Supreme Social
Court ruling made  available to Exogen in the quarter ended March 31, 1998.  The
ruling stated that reimbursement  under the  Bundesausschuss  system (the German
federal   organization  that  establishes  medical   reimbursement   policy  for
outpatient  healthcare  providers) for new medical therapies could occur only if
the  new  therapy  was  part  of  the   official   book  of   therapies  of  the
Bundesausschuss.  Prior to this ruling,  Exogen relied on a 1995 German  Supreme
Social  Court  ruling  that  established  that  new  medical  therapies  must be
reimbursed  under the  pre-Bundesausschuss  system if (i)  treatment  was proven
effective and economical and (ii) treatment did not exceed the scope of what was
necessary.  Exogen believed the clinical  effectiveness  of the SAFHS device and
the  device's  economic  benefits  would  satisfy the  requirements  of the 1995
ruling.  However,  based on the later ruling and the fact that the SAFHS therapy
is not part of the official book of therapies,  Exogen recorded the nonrecurring
charge.

         To assist in the collection of  outstanding  claims and to expedite the
reimbursement process on future claims, Exogen is seeking nationwide approval by
the  Bundesausschuss.  To this end, in August  1997,  Exogen  submitted a formal
application   to   the   National   Krankenkasse   (the   predecessor   to   the
Bundesausschuss).  The  application  process  includes  scientific  and economic
assessments.  In August 1998, the Minister of Health accepted the recommendation
of the Bundesausschuss not to approve national  reimbursement for SAFHS therapy.
Exogen is appealing the Minister of Health's decision through administrative and
legal  channels,  but has been  delayed by the November  1998  election of a new
government  and concurrent  appointment of a new Minister of Health.  Exogen has
also filed a lawsuit against the Bundesausschuss to challenge its decision. Both
actions are being actively pursued at this time.

         Because  there is no  nationwide  reimbursement  approval for the SAFHS
device by the  Bundesausschuss,  Exogen  has  adopted  the  policy  that,  since
September  1997, for each  prescription  submitted to Exogen in Germany,  Exogen
<PAGE>
ships the SAFHS  device only after  receiving  reimbursement  approval  for that
device. This preapproval involves a case-by-case review by a local reimbursement
authority,  which has the  discretion to reimburse for the device  regardless of
the  decision  of the  Bundesausschuss.  The  local  decision  is  based on data
supplied by Exogen and the prescribing physician.

         In Holland,  we have  received  approval  from the  Ministry of Health,
Welfare,  and Sports of The  Netherlands  for the  nationwide  reimbursement  of
Exogen's  SAFHS device for the  treatment of nonunion  fractures  older than six
months.  The approval,  which will be effective  April 1, 1999,  was based on an
extensive  review by the  Ziekenfondsraad  (Sick Fund  Council) of the  clinical
efficacy and economic benefits of SAFHS therapy.

         In France,  we have applied to be listed on the Tarif  Interministeriel
des Prestations  Sanitaries  ("TIPS").  France's list of medical devices allowed
for   prescription  by  physicians   working  in  the  private  sector  and  for
reimbursement  by the  National  Health  Insurance.  That  application  is still
pending, and therefore, we do not sell SAFHS devices in France at this time.

         In  Japan,  our  Japanese  distributor,   Teijin,  received  nationwide
reimbursement  approval  from the  Japanese  Health and Welfare  Ministry in May
1998.

         We cannot assure you that we will be  successful in obtaining  national
reimbursement  approval in Germany,  France,  or other  countries.  If we do not
obtain national reimbursement  approval of the SAFHS device in Germany,

                                      -7-
<PAGE>
France,  and other  countries,  our business,  financial  condition,  results of
operations, and cash flows could be materially and adversely affected.

Extensive Government Regulation

         United States. Our current product and our future products, if any, are
subject to extensive  regulation  by the FDA in the United States and by similar
regulatory  authorities  in other  countries.  Prior to  commercial  sale in the
United  States,  each of our  products  must  undergo  an  extensive  regulatory
approval process  conducted by the FDA under the Federal Food, Drug and Cosmetic
Act  ("FDC  Act").  The  FDA  regulates  the  clinical  testing,  manufacturing,
labeling,  distributing,  and promoting of medical devices.  Noncompliance  with
applicable requirements can result in failure of the government to grant PMA for
devices,  withdrawal  of the PMA,  total or partial  suspension  of  production,
fines, injunctions, civil penalties, recall or seizure of products, and criminal
prosecution.

         Medical  devices are  classified  into three classes (I, II, or III) on
the basis of the  controls  necessary  to  reasonably  assure  their  safety and
effectiveness.  The SAFHS device is classified as a Class III device,  the class
subject to the  highest  level of  regulation  by the FDA.  In  addition  to the
general control requirements of the FDC Act (including  registration,  labeling,
pre-market notification,  and adherence to Good Manufacturing Practices ("GMP"),
the SAFHS device is also subject to pre-market approval.

         Before a new Class III device can be  introduced  into the market,  the
manufacturer  must  obtain FDA  clearance  through a PMA  application.  The less
burdensome  510(k)  pre-market  notification  process  has not been,  and is not
expected to be, available for any of our products.  Accordingly,  we have had to
obtain,  and  expect  to apply  for,  PMAs and PMA  supplements  for our  future
products.

         A PMA  application  must be  supported  by  extensive  data,  including
preclinical  and clinical trial data, to demonstrate  the safety and efficacy of
the device for the uses  specified  in the PMA  application.  If human  clinical
trials of a device are required and the device  presents a  "significant  risk,"
the  manufacturer or the distributor of the device must file an  Investigational
Device Exemption  ("IDE") and have an approved  application  prior to commencing
human clinical trials.

         The IDE application must be supported by data,  typically including the
results of animal and laboratory  testing.  If the IDE  application is approved,
human clinical  trials may begin at a specific number of  investigational  sites
with a specified maximum number of patients, as recommended by the FDA. Sponsors
of clinical trials are permitted to sell those devices distributed in the course
of study  as long as  compensation  does not  exceed  recovery  of the  costs of
manufacturing, researching, developing, and handling.

         Upon  receipt  of the  PMA  application,  the  FDA  makes  a  threshold
determination as to whether the application is sufficiently complete to permit a
substantive   review.  If  the  FDA  determines  that  the  PMA  application  is
sufficiently  complete to permit a substantive  review,  the FDA will "file" the
application.  An FDA review of a PMA application generally takes between two and
three  years  from  the  date  the  PMA  application  is  filed,  but  may  take
significantly  longer.  The  review  time is  often  significantly  extended  by
requests  from the FDA for more  information  or  clarification  of  information
already  provided  in the  submission.  During the review  period,  an  advisory
<PAGE>
committee,  including clinicians, will likely be convened to review and evaluate
the application and provide  recommendations to the FDA as to whether the device
should be approved. In addition, the FDA will inspect the manufacturing facility
to ensure compliance with the FDA's GMP requirements  prior to approval of a PMA
application.

         The PMA process can be expensive,  lengthy,  and  uncertain.  We cannot
assure you that we will be able to obtain necessary  regulatory  approvals.  The
loss of  previously  received  approvals,  or failure to comply with existing or
future  regulatory  requirements,  would have a material  adverse  effect on our
business, financial condition, results of operations, and cash flows.

         We are required to file a PMA  supplement  for new or expanded  uses of
our SAFHS technology and for any material  modifications to the SAFHS device. If
a PMA  supplement  is not  accepted  by the  FDA  for a new or  expanded  use or
material  modification  of the SAFHS  device,  we must commence and complete the
entire  pre-market  approval process with respect to such use or modification of
the SAFHS  device.  We began  commercial  distribution  of the SAFHS  2000,  the
second-generation SAFHS device, in the United States in May 1997 pursuant to FDA
approval of a PMA supplement in March 1997. In August 1998, we resubmitted a PMA
supplement for expanded and new applications of the SAFHS 2000 device. We cannot
guarantee that this  supplement will be accepted on a timely basis or at all. In
addition,   we  will  be   required   to   file  a  PMA   application   for  our
mechanical-


                                      -8-
<PAGE>
stress device,  if and when development is completed.  We cannot assure you that
any PMA application  relating to the  mechanical-stress  device will be filed or
granted on a timely basis, or at all.

         Any products  manufactured or distributed by us pursuant to an approved
PMA are subject to pervasive and  continuous  regulation  by the FDA,  including
record-keeping  requirements,  reports of adverse experience with the use of the
device,  postmarket  surveillance,  postmarket  registry,  and other  actions as
deemed  necessary by the FDA.  Product  labeling and  promoting  activities  are
subject to scrutiny by the FDA and, in certain  instances,  by the Federal Trade
Commission.  Exogen and its agents may promote  products  only for the products'
approved  indications.  We  cannot  assure  you that  the FDA  will  not  impose
modifications to the labeling that could adversely affect our ability to market,
sell, or be reimbursed for the SAFHS device.  In addition,  we cannot assure you
that we will not  become  subject  to FDA  actions  as a result  of  physicians'
prescribing the SAFHS device for off-label uses.

         We are also subject to numerous federal, state, and local laws relating
to  such  matters  as  safe   working   conditions,   manufacturing   practices,
environmental  protection,  fire hazard  control,  and  disposal of hazardous or
potentially  hazardous  substances.  We  cannot  assure  you that we will not be
required to incur  significant costs to comply with such laws and regulations in
the future,  or that such laws or regulations  will not have a material  adverse
effect upon our business,  financial conditions,  results of operations, or cash
flows.

         International.  To  market  and sell the  SAFHS  device  or any  future
products in foreign markets, we must comply with foreign government regulations,
the  requirements  of which differ  substantially  from  country to country.  In
Europe,  we are  required  to comply with the Medical  Device  Directive,  which
covers most medical devices.  Under the Medical Device  Directive,  most medical
devices must qualify for the CE mark,  and effective  June 1998,  must bear a CE
mark to be marketed  and sold in the  European  Union.  To obtain the CE mark, a
manufacturer  must  demonstrate  compliance with product safety  requirements as
well as quality system requirements. The CE mark is recognized by countries that
are members of the European  Union and the European Free Trade  Association.  We
received  the CE mark for the SAFHS  Model 2A in  August  1996 and for the SAFHS
2000 in March 1998. We cannot assure you that we will be able to obtain CE marks
for future generations, if any, of the SAFHS device.

         Although  members  of the  European  Union must  accept  for  marketing
medical devices bearing a CE mark without imposing further  requirements related
to product safety and  performance,  each country may require the use of its own
language on labels and instructions for use. National Competent Authorities, who
are required to enforce  compliance with the  requirements of the Medical Device
Directive,  can restrict,  prohibit,  and recall CE-marked  products if they are
considered  to be unsafe.  Such a decision  must be  confirmed  by the  European
Commission to be valid.  Member countries may impose additional  requirements as
long as they do not violate the Medical Device Directive or constitute technical
barriers to trade.

         We cannot assure you that the FDA or any foreign  regulatory  authority
will approve our current or future products in a timely manner, or at all. If we
experience  delays or failure in obtaining such  approvals,  lose any previously
received  approvals,  or fail to  comply  with  existing  or  future  regulatory
requirements, our business, financial condition, results of operations, and cash
flows will be materially and adversely affected.
<PAGE>
Uncertainty of New Product Development

         We plan to seek FDA  approval  to begin  clinical  trials to expand the
approved uses for the SAFHS  technology to include  other  long-bone  fractures,
lower-spine  fusion, and cartilage repair. We also plan to undertake  additional
development  activities  and human  clinical  trials  for our  mechanical-stress
device,  which is designed to prevent  bone loss  related to  osteoporosis.  Our
research and  development  efforts  with  respect to expanded  uses of the SAFHS
technology  and the  mechanical-stress  device  may not lead to  development  of
applications  or products  that are shown to be safe and  effective  in clinical
trials. In addition, these new applications or products may not:

            -  meet applicable regulatory standards;
            -  be capable of being  manufactured  in  commercial  quantities  at
               acceptable costs;
            -  be eligible for third-party  reimbursement  from  governmental or
               private insurers;
            -  be successfully marketed; or
            -  achieve market acceptance.

         At any stage of the development  process,  new applications or products
that appeared  promising in  preclinical  studies or trials may not  demonstrate
efficacy  in  larger-scale  clinical  trials and as a result,  would not receive
regulatory  approval.  As a result,  it is possible that we may have to curtail,
redirect, suspend, or eliminate some or all of our product development programs.


                                      -9-
<PAGE>
Risks Associated with Intense Competition

         The medical device industry is intensely competitive.  The SAFHS device
competes with non-invasive bone-growth  electrical-stimulation  devices and with
various surgical treatments.  In the United States there are four companies that
currently   market   electrical   stimulation   devices  for  the  treatment  of
slow-healing  fractures, in direct competition with the SAFHS device. We believe
that some of these  companies are conducting  preclinical  or clinical  research
relating  to the use of  electrical  stimulation  for  the  treatment  of  fresh
fractures.  If our mechanical-stress  device is developed,  approved by the FDA,
and  commercialized,  it will  compete  with  drug  therapies,  growth  factors,
bone-graft  substitutes,  and exercise/physical  therapy equipment.  Many of our
competitors have substantially greater financial,  technical,  marketing, sales,
and  distribution  resources  than we do.  They  also have  more  experience  in
research and development,  clinical trials,  and regulatory  matters than us. In
addition, most of our competitors have established third-party reimbursement for
their  products.  We cannot  assure you that our  competitors  will not  develop
products that are superior to ours, achieve greater market acceptance, or render
our  technology  and  products  obsolete  or  noncompetitive,  in which case our
business,  financial  condition,  results of  operation,  and cash flows will be
materially and adversely affected.

Risks Associated with Rapid Technological Change

         The  medical  device  industry  is   characterized   by  rapid  product
development and technological change. We expect that the technologies associated
with medical devices will continue to develop rapidly.  As a result,  our future
success  will depend in large part upon our  ability to  maintain a  competitive
position  with  respect to those  technologies.  Technological  developments  by
others may result in our products' obsolescence or becoming too expensive before
they are  marketed  or  before we  recover a  significant  portion  of  expenses
incurred in connection with developing and  commercializing  those products,  in
which case our business,  financial condition,  results of operations,  and cash
flows will be materially and adversely affected.

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

         Our success  will depend in part on our ability to obtain and  maintain
United States and foreign patent  protection,  preserve our copyrights and trade
secrets, and operate without infringing the proprietary rights of third parties.
We place considerable  importance on obtaining patent protection for significant
new technologies, products, and processes. With respect to our SAFHS technology,
we hold title to 11 issued United States patents,  one issued  Canadian  patent,
one issued Taiwanese patent,  one issued New Zealand patent, one issued Japanese
patent, 14 pending United States patent  applications,  and corresponding Patent
Cooperation Treaty and foreign patent  applications.  The original United States
ultrasound  patent that is the basis of the SAFHS device expires in 2007. Our 10
other issued  United States  patents  relating to SAFHS  technology  will expire
between 2008 and 2014.

         With respect to our mechanical-stress  technology, we are the exclusive
licensee of four issued United States patents,  two issued foreign patents,  one
pending  United  States  patent  application,  and four pending  foreign  patent
applications. The four issued United States patents will expire between 2010 and
2011.  The  exclusive  license  agreement  relating  to  the   mechanical-stress
<PAGE>
technology provides for royalty payments on sales of products using the patented
technology.  Under the license agreement,  our exclusive license may revert to a
nonexclusive license if we do not use good faith efforts to commercially exploit
the patented  technology.  The license  agreement  expires on the later of March
2022 or the expiration of the final patent licensed to us.

         We  believe  we own or  have  the  right  to use  all  the  proprietary
technology necessary to manufacture and market our products.  Under current law,
patent applications in the United States are maintained in secrecy until patents
issue,  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,  rather than the first to file a
patent  application,  while in  foreign  countries,  ownership  of a  patent  is
typically determined by priority of patent filing, not invention.  Consequently,
we cannot be certain that we were the first to invent certain technology covered
by  pending  patent  applications  or that  we were  the  first  to file  patent
applications for such inventions.  In addition,  the patent positions of medical
device  companies,  including ours, are generally  uncertain  partly because the
positions involve complex legal and factual questions.

         Legal standards  relating to the validity of patents  covering  medical
devices and biotechnological  inventions and the scope of claims made under such
patents  are still  developing.  Our patent  position  is highly  uncertain  and
involves  complex  legal and factual  questions.  We cannot be certain  that the
applicants  or inventors of subject  matter  covered by patent  applications  or
patents owned by or licensed to us were the first to invent or the first to file
patent applications for such inventions. In addition, we cannot guarantee that:



                                      -10-
<PAGE>
            -  patent  applications  to which we hold  rights will result in the
               issuance of patents;
            -  any patents  issued or licensed to us will be free from challenge
               and that if challenged, they would be held to be valid;
            -  any such patents will provide commercially significant protection
               to our  technology,  products,  and  processes; 
            -  others will not independently  develop  substantially  equivalent
               proprietary  information  that is not covered by patents to which
               we own rights or obtain access to our know-how; or
            -  others  will not be issued  patents  that may prevent the sale of
               one or more of our products, or require a license and the payment
               of significant fees or royalties by us to third parties to enable
               us to conduct our business.

         We have not received any notices alleging, and we are not aware of, any
infringement by us of any other entity's patents. However, because of the volume
of patents issued and patents applications filed relating to medical devices, we
cannot assure you that current and potential competitors and other third parties
have not filed or will not file  patent  applications,  or have not  received or
will not receive  patents,  relating to materials or processes we use or propose
to use.  Accordingly,  we cannot  assure you our  products do not  infringe  any
patents or proprietary rights of third parties.

         If another  party claims the same or  overlapping  subject  matter with
subject matter we have claimed in a United States patent  application or patent,
we may decide or be required to participate in  interference  proceedings in the
United States Patent and  Trademark  Office to determine  priority of invention.
Loss of such an interference  proceeding  would deprive us of patent  protection
sought or previously obtained. Participating in such proceedings could result in
substantial costs, whether or not the eventual outcome is favorable.

         In addition to patent  protection,  we rely on trademarks,  copyrights,
trade  secrets,  proprietary  know-how,  and  confidentiality  and assignment of
invention  agreements  with  our  employees,  consultants,  distributors,  sales
agents,  and marketing  partners to protect our intellectual  property.  We hold
United  States  federal  trademark   registrations  for  the  marks:   SAFHS(R),
EXOGEN(R),  SAFHS 2000(R) and EXOGEN 2000(R). We also hold registrations for the
SAFHS(R) mark in Japan, Canada and Mexico. Trademark applications for the EXOGEN
and SAFHS 2000 marks are pending in foreign  countries,  and an application  for
the EXOGEN  2000(TM)  mark is pending in the United  States.  We hold  rights to
copyrights on text and software we develop in connection with the SAFHS device.

         We cannot assure you that any issued  patents or copyrights we own will
provide  us  with  a  competitive   advantage  or  will  not  be  challenged  or
circumvented   by  our   competitors.   We  also  cannot  assure  you  that  our
confidentiality  and assignment of invention  agreements will not be breached or
that we would have  adequate  remedies for any such breach.  Finally,  we cannot
assure  you  that our  copyrights,  trade  secrets,  proprietary  know-how,  and
intellectual  property will not become known or be  independently  discovered by
others.

         Litigation may be necessary to defend  against claims of  infringement,
to enforce patents and copyrights  issued or licensed to us, or to protect trade
secrets.  If we must litigate such issues, we may be forced to incur substantial
costs and to devote substantial resources and time. We cannot assure you that we
would  prevail  in such  litigation.  In  addition,  if any  relevant  claims of
third-party  patents are upheld as valid and enforceable,  we could be prevented
<PAGE>
from  selling our  products or could be  required  to obtain  licenses  from the
owners  of such  patents.  We  cannot  guarantee  that  such  licenses  would be
available or, even if available,  would be on acceptable  terms to us. If we are
forced to incur substantial costs in litigation or fail to obtain a license, our
business,  financial  condition,  results of operations,  and cash flows will be
materially and adversely affected.

Manufacturing and Related Risks

         We have developed  in-house  manufacturing and refurbishing  capability
for the SAFHS 2000 device.  Although we are able to manufacture our entire SAFHS
2000  production   in-house,   previous  purchase   commitments  to  a  contract
manufacturer  and our  belief  that it is  prudent  to have a second  source  to
support our in-house  manufacturing require our use of a contract  manufacturer.
We  anticipate  that  approximately  one third of our  fiscal  1999  SAFHS  2000
production will be supplied by the contract manufacturer.

         The FDA regulates  manufacturers  of medical devices that have received
FDA  approval.  We are required to adhere to FDA  regulations  setting forth GMP
requirements  relating to tests,  control, and documentation.  State and federal
agencies  monitor ongoing  compliance with GMP and other  applicable  regulatory
requirements  through periodic  inspections.  The FDA has inspected and approved
our  facilities and those of our contract  manufacturer 


                                      -11-
<PAGE>
under the FDA's Quality System Regulations.  If we or the contract  manufacturer
fail to maintain our facilities in accordance  with the FDA's GMP  requirements,
the noncomplying party could lose the ability to manufacture the SAFHS device on
a  commercial  scale.  Loss of this  manufacturing  capability  could  limit our
ability to deliver the SAFHS device to physicians  or patients.  If this occurs,
our business, financial condition, results of operations, and cash flows will be
materially and adversely affected.

         The manufacture of the SAFHS device involves an assembly process with a
number of  significant  components.  Each device is tested and released by us in
accordance with FDA requirements.  Most purchased  components are available from
more than one vendor.  However, two key components currently are manufactured by
single-source   vendors.   For  these  components,   there  are  relatively  few
alternative  sources of  supply.  However,  we are  actively  in the  process of
qualifying  alternative  vendors  for these  components.  If the supply of these
components  is  interrupted,  and we  are  unable  to  establish  additional  or
replacement  suppliers for such components,  our business,  financial condition,
results of operations, and cash flows will be materially and adversely affected.

Royalty Payment Obligations; Potential Loss of Exclusive License

         If we successfully  develop the  mechanical-stress  device,  we will be
required to pay a royalty on any net  revenues  from sales of this  product.  We
have an exclusive  license to the  mechanical-stress  technology,  which we will
lose if we do not commercially exploit the technology underlying the license. We
cannot assure you that we will be able to commercially  exploit this technology.
If we lose the exclusive license, our business,  financial condition, results of
operations, and cash flows could be materially and adversely affected.

Reliance on Key Personnel

         Our success depends to a significant extent upon our executive officers
and other key  technical  personnel.  If we lose the  services  of an  executive
officer or one or more key  employees  or our ability to attract and retain such
personnel, our business,  financial condition,  results of operations,  and cash
flows will be materially and adversely  affected.  Except for Patrick  McBrayer,
none of our  executive  officers or key  employees  is a party to an  employment
agreement  with  Exogen.  We do not have "key person"  life  insurance  policies
covering any of our employees.

Possible Volatility of Stock Price

         The  trading  price  of our  common  stock  has  been  subject  to wide
fluctuations  in the past.  Our common  stock's  trading price could continue to
fluctuate   in  response  to   variations   in  quarterly   operating   results,
announcements  of  technological  innovations  or  new  products  by us  or  our
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 significant price and volume fluctuations that
have  affected  the market  prices of equity  securities  of many  companies  in
industries  similar to ours.  This  volatility  has often been  unrelated to the
operating  performance  of  these  companies.   These  market  fluctuations  may
adversely  affect the market price of our common stock.  In the past,  companies
that have  experienced  volatility  in the market price of their stock have been
the object of  securities  class  action  litigation.  If we were the subject of
securities class action  litigation,  it could result in substantial costs and a
diversion of management's attention and resources.
<PAGE>
Risks Associated With Low-Priced Stocks

         Continued  inclusion of our common stock on the Nasdaq  National Market
will require the following:

            -  that the  public  float  consist  of at least  750,000  shares of
               common stock, valued in the aggregate at more than $5 million;
            -  that we maintain at least $4 million in net tangible assets;
            -  that our common stock be held by at least 400 holders; and
            -  that the minimum bid price for our common stock be at least $1.00
               per share.

         If we are unable to satisfy such maintenance  requirements,  our common
stock may be removed to the Nasdaq  SmallCap  Market or delisted from the Nasdaq
Stock  Market.  In the event our common stock is delisted  from the Nasdaq Stock
Market,  trading, if any, in the securities would thereafter be conducted in the
over-the-counter  market in the "pink  sheets" or the  National  Association  of
Securities Dealers' "Electronic Bulletin Board." Consequently,  the liquidity of
our  common  stock  could be  materially  impaired,  not only in the  number  of
securities that can be bought and sold at a given price, but also through delays
in the timing of  transactions  and  reduction  in  security  analysts'  and the
media's  coverage of us. This could  result in lower prices for our common stock
than 

                                      -12-
<PAGE>
might  otherwise be attained,  and could also result in a larger spread  between
the bid and asked prices for our common stock.

         In addition, if our common stock is delisted from trading on the Nasdaq
Stock  Market and the trading  price of our common  stock is less than $5.00 per
share,  trading in the common stock would also be subject to the requirements of
Rule 15g-9 promulgated  under the Exchange Act. Under such rule,  broker/dealers
who recommend low-priced  securities to persons other than established customers
and  accredited  investors  must satisfy  special sales  practice  requirements,
including a requirement  that they make an  individualized  written  suitability
determination  for the purchaser  and receive the  purchaser's  written  consent
prior to the transaction.  The Securities  Enforcement  Remedies and Penny Stock
Reform Act of 1990 also requires  additional  disclosure in connection  with any
trades involving a stock defined as a penny stock (generally any equity security
not traded on an exchange or quoted on the Nasdaq Stock Market that has a market
price of less than $5.00 per share,  subject to certain  exceptions),  including
the delivery,  prior to any penny stock  transaction,  of a disclosure  schedule
explaining the penny stock market and the associated  risks.  Such  requirements
could severely limit the market  liquidity of our common stock. We cannot assure
you that our common stock will not be delisted or treated as a penny stock.

Year 2000 Risks

         The Year 2000  compliance  issue  results from the inability of systems
that utilize computer  programs to  differentiate  between the year 1900 and the
year 2000. This issue arises because many such programs were developed using two
digits  rather than four digits to identify the  applicable  year.  As a result,
programs that use time-sensitive  calculations may not function correctly in the
year 2000.  Those programs  developed using  four-digit  years are probably Year
2000  compliant,  however,  all other programs will likely require  modification
and/or  replacement  to be  compliant.  The Year  2000  issue  not only  affects
computer  hardware  and  software,  but also can  affect  equipment  used in our
operations,  and extends to the systems of outside suppliers and customers, upon
which we rely.  Failure to address the Year 2000 issue on a timely basis,  or at
all,  for  critical  programs  used by us could  result  in system  failures  or
miscalculations,  which  could have  material  adverse  effect on our  business,
results of operations, financial condition, and cash flows.
<PAGE>
         In fiscal 1998,  we performed  an initial  assessment  of our Year 2000
compliance relating to the following:

            -  the SAFHS devices;
            -  our information systems' hardware and software;
            -  our custom-developed business applications;
            -  third-party business software; and
            -  other equipment using computer programs.

We do not believe that any of these areas will have a material adverse effect on
our business,  results of operations,  financial  condition,  and cash flows. We
cannot  assure  you that we will not find  Year 2000  issues  in these  areas as
further  compliance  testing  occurs,  or that such  issues,  if  found,  can be
corrected on a timely basis.

         We also performed an initial  assessment of Year 2000 compliance on our
suppliers,  customers,  and marketing partners. We rely on, and will continue to
rely on, these third parties to provide the following:

            -  equipment, goods, and services;
            -  reimbursement for the SAFHS devices; and
            -  marketing and distributing support for the SAFHS device.

There can be no assurance that these third parties will adequately  address Year
2000 compliance  issues or that contingency  plans in certain areas are possible
or  practical.  As a result,  there  could be a material  adverse  affect on our
business, results of operations, financial conditions, and cash flows.

Possible Adverse Effect of the Euro Conversion

         On January 1, 1999, 11 of the 15 member countries of the European Union
established  fixed conversion rates between their existing  currencies and a new
common  currency called the "euro." This represents an initial step in a process
expected to culminate in the  replacement  of the existing  currencies  with the
euro. The conversion to the euro may have operational and legal implications for
some of our international  business  activities.  We have begun consideration of
the  effects of the euro  conversion  on our  operations,  but we are  currently
unsure  of the  potential  


                                      -13-
<PAGE>
impact that the euro conversion will have on our business,  financial condition,
results of  operations,  and cash  flows,  particularly  as the euro  conversion
relates to our European operations.

Certain Anti-takeover Provisions

         Certain  provisions of our Certificate of  Incorporation  could make it
more  difficult for a third party to acquire  control of our  business,  even if
such change in control would be beneficial to our stockholders.  Our Certificate
of Incorporation  allows our Board of Directors to issue preferred stock without
stockholder  approval.  In  addition,  we  entered  into a Rights  Agreement  in
December  1996 that allows our Board of  Directors  to declare a dividend of one
right to purchase, under certain circumstances,  one one-hundredth of a share of
preferred stock for each share of common stock  outstanding.  Although we do not
have any current plans to issue any preferred  stock,  the issuance of preferred
stock in the future  could make it more  difficult  for a third party to acquire
our business.

         In addition,  certain  provisions  of Delaware law and our bylaws could
discourage a third party from  attempting  to acquire  control of our  business.
Section 203 of the Delaware  General  Corporation Law prohibits us from engaging
in  any  business  combination  with  an  interested  stockholder  (generally  a
stockholder  who,  together  with  its  affiliates,  owns  15%  or  more  of our
outstanding  stock) for a period of three years unless  certain  conditions  are
met.  Section 203 may also have the effect of  discouraging  a proxy  contest or
tender offer.  In addition,  certain  provisions of our bylaws contain  specific
procedures   stockholders  must  follow  in  making  director   nominations  and
submitting proposals for consideration at stockholder meetings. These provisions
could make it more difficult for a third party to acquire our business.

Product Liability and Insurance

         Our business  exposes us to potential  product  liability  risks in the
event that the use of our products is alleged to have  resulted in physical harm
or other adverse  effect.  Product  liability  insurance for the medical  device
industry is  expensive.  We currently  carry  product  liability  coverage of $3
million per  occurrence,  with  coverage in the  aggregate of $3 million for all
claims made in any policy year.  In  addition,  we maintain  umbrella  liability
insurance,  including product liability coverage, of $10 million per occurrence,
with  coverage in the aggregate of $10 million for all claims made in any policy
year.  Although to date we have not been the  subject of any  product  liability
claims,  we cannot assure you that our insurance will provide adequate  coverage
against  potential claims or that we will be able to maintain product  liability
insurance on acceptable  terms, or at all. If a product  liability claim exceeds
the coverage of our insurance policy, our business, financial condition, results
of operations, and cash flows will be materially and adversely affected.

Shares Eligible for Future Sale

         If our  stockholders  sell  substantial  amounts  of our  common  stock
(including shares issued upon the exercise of outstanding  options and warrants)
in the public  market,  the market  price of our common  stock could fall.  Such
sales also  might  make it  difficult  for us to sell  equity or  equity-related
securities  in the  future at a time and price that we deem  appropriate.  As of
January 31, 1999,  there were 12,738,650  shares of common stock  outstanding as
follows:
<PAGE>
            -  820,000 shares of common stock,  which are held by Smith & Nephew
               and are covered by a  registration  statement that has been filed
               with the SEC but not declared effective;
            -  approximately  2.7 million  shares,  which are held by affiliates
               and are subject to the volume restrictions of Rule 144; and
            -  the  remaining  outstanding  shares  of common  stock,  which are
               freely tradeable.

The possible  sale of a  significant  number of the above shares of common stock
may cause the price of our common stock to fall.

         We have registered for resale 1,350,000 shares of common stock reserved
for issuance under our 1995 Stock Option/Stock  Issuance Plan, as amended. As of
January 31,  1999,  options to purchase  1,090,860  shares of common  stock were
outstanding  and will be  eligible  for sale in the public  market  from time to
time,  subject to  vesting.  In  addition,  159,632  shares of common  stock are
available under Exogen's  employee stock purchase plan, as amended.  Also, there
are 125,000 shares of common stock issuable upon exercise of warrants, which may
be sold in accordance  with Rule 144 one year after their date of issuance.  The
possible  sale of a significant  number of the shares  issuable upon exercise of
stock options and warrants, or under the employee stock purchase plan, may cause
the price of our common stock to fall.


                                      -14-
<PAGE>
Smith & Nephew has Certain Rights to Purchase Shares of Common Stock

         Under the August 1998 agreements between Smith & Nephew and us, Smith &
Nephew has an option to acquire exclusive worldwide  distribution rights (except
Japan) to the SAFHS device.  This worldwide  distribution option is limited to a
three-year  period.  If Smith & Nephew exercises this option,  it has a one-time
right to  purchase  from us  additional  shares of our common  stock,  up to 19%
(including  the shares  already  acquired by Smith & Nephew) of the  outstanding
shares of our common  stock,  after giving  effect to the shares  issuable  upon
exercise  of the right.  The price per share to be paid would  equal the stock's
average fair market value over a 20-day period preceding the date Smith & Nephew
announces, to Exogen, its election to exercise the stock purchase option. Any of
these  additional  shares of our common stock sold to Smith & Nephew under these
agreements  would  require  that  we  file a  registration  statement  with  the
Securities and Exchange  Commission to register the shares. The possible sale of
a significant  number of these shares may cause the price of our common stock to
fall.

No Intention to Pay Dividends

         We have never declared or paid any cash dividends on our capital stock.
We  currently  intend to retain any future  earnings  for  funding  growth,  and
therefore, do not expect to pay any dividends in the foreseeable future.



                                 USE OF PROCEEDS

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


                                      -15-


<PAGE>
                      SELECTED CONSOLIDATED FINANCIAL DATA

         Set forth below are the selected consolidated financial data for Exogen
for the five fiscal years ended September 30, 1998. The following data should be
read in conjunction  with Exogen's  financial and their related notes statements
and with  "Management's  Discussion  and  Analysis of  Financial  Condition  and
Results of  Operations" in the Annual Report on Form 10-K filed on September 30,
1998.
<TABLE>
<CAPTION>
                                       SELECTED CONSOLIDATED FINANCIAL DATA
                                       (in thousands, except per share data)

                                                                    For the years ended September 30,
                                                      ------------------------------------------------------------
                                                        1998         1997         1996         1995         1994
                                                      --------     ---------    ---------    --------     -------- 
<S>                                                   <C>          <C>          <C>          <C>          <C>     
Statement of Operations Data:
Revenues:
   Product sales..................................    $ 11,201     $   7,081    $   5,777    $  1,852     $      -
   Revenues from development agreements...........         400           400         1,100          -            -
                                                      --------     ---------    ---------    --------     -------- 
     Total revenues...............................      11,601         7,481         6,877      1,852            -
                                                      --------     ---------    ---------    --------     -------- 
Operating costs and expenses:
   Cost of product sales..........................       4,585         3,864         3,661      1,128            -
   Research and development.......................       2,792         3,124         3,988      2,545        1,432
   Selling, general, and administrative...........      11,885        12,291        11,030      5,775        1,782
   Nonrecurring charge for international                                                                   
     doubtful accounts............................         800             -             -          -            - 
                                                      --------     ---------    ---------    --------     -------- 
     Total operating costs and expenses...........      20,062        19,279        18,679      9,448        3,214
                                                      --------     ---------    ---------    --------     -------- 

Operating loss....................................      (8,461)      (11,798)      (11,802)    (7,596)      (3,214)

Other income (expense):
   Interest income (expense), net.................         710           701         1,438        604         (185)
   License fee....................................       1,000             -             -          -            -
   Litigation settlement..........................        (851)            -             -          -            -
   Other, net.....................................          19           (51)         (224)       (59)          (2)
                                                      --------     ---------    ---------    --------     -------- 
     Total other income (expense), net............         878           650         1,214        545         (187)
                                                      --------     ---------    ---------    --------     -------- 

Loss before income taxes..........................      (7,583)      (11,148)      (10,588)    (7,051)      (3,401)

Provision for income taxes........................           2             4             -          -            -

Net loss..........................................    $ (7,585)    $ (11,152)   $(10,588)    $ (7,051)    $ (3,401)
                                                      ========     =========    ========     ========     ======== 

Basic net loss per common share [a]...............    $  (0.64)    $   (1.12)   $   (1.07)   $  (0.94)    $  (2.70)
                                                      ========     =========    =========    ========     ======== 
Diluted net loss per common share [a].............    $  (0.64)    $   (1.12)   $   (1.07)   $  (0.94)    $  (2.70)
                                                      ========     =========    =========    ========     ======== 
Wghtd. avg. shares outstanding, basic and diluted.      11,860         9,946         9,875      7,489        1,261
</TABLE>
<PAGE>
- ---------------------------
[a]  Loss per share data for fiscal  years 1995 and 1994 have been  restated  in
     accordance  with  Statement  of  Financial  Accounting  Standards  No. 128,
     "Earnings per Share."

<TABLE>
<CAPTION>
                                                                              September 30,
                                                      ------------------------------------------------------------
                                                         1998          1997         1996         1995         1994
                                                      --------     ---------    ---------    --------     --------
<S>                                                   <C>          <C>          <C>          <C>          <C>     
Balance Sheet Data:
Cash and cash equivalents and short- and long-term    $ 15,582     $   8,544    $  19,534    $ 31,061     $    640
   investments....................................
Working capital...................................      15,525        11,042        17,235     30,054          301
Total assets......................................      20,796        14,789        25,511     34,886        1,773
Redeemable Preferred Stock........................           -             -             -          -        6,002
Total stockholders' equity (deficit)..............      16,297        12,091        23,077     33,342       (5,487)

</TABLE>
                                                        16
<PAGE>
                               SELLING STOCKHOLDER

         The  following  table sets  forth the number of shares of Common  Stock
beneficially owned by the Selling  Stockholder as of March 16, 1999. The Selling
Stockholder  has not had a material  relationship  with  Exogen  within the past
three  years  other than as a result of the  distribution  relationship  between
Exogen and Smith & Nephew and the Selling Stockholder's  ownership of the Shares
or other  securities of Exogen.  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."

(2)       Smith &  Nephew  plc is the  ultimate  parent  corporation  of Smith &
          Nephew  Holdings,  Inc.  Mr.  Christopher  J.  O'Donnell  is the chief
          executive officer of Smith & Nephew plc and, as such, may be deemed to
          have voting and  investment  power with  respect to such  shares.  The
          address  for  Smith &  Nephew  Holdings,  Inc.  is 1450  Brooks  Road,
          Memphis, Tennessee 38116.


         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,  a U.S. sales  representative  agreement  under which Smith &
Nephew  obtained  exclusive  rights to  distribute  SAFHS  devices in the United
States, and a stock purchase agreement. As part of the transaction,  the Selling
Stockholder  purchased  820,000 shares of Exogen's Common Stock for an aggregate
purchase  price of $4.1 million,  or $5.00 per share.  On the closing date,  the
fair  market  value of  Exogen's  Common  Stock was $3.625.  The  aggregate  net
proceeds of the sale to Exogen were $4.0 million, which will be used for general
corporate purposes.

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

         Exogen 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.
<PAGE>
                              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.  Exogen  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
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 Exogen nor the Selling Stockholder can
presently estimate the amount of such compensation.  Exogen knows of no existing
arrangement between the Selling  Stockholder and any other 


                                      -17-
<PAGE>
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; (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  Exogen  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.  Exogen  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  Exogen and its affiliates  against certain
liabilities,  including  liabilities  under the  Securities  Act  under  certain
circumstances.
<PAGE>
         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 Exogen 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
Exogen's Common Stock by the Selling Stockholder.

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

                                  LEGAL MATTERS

         The  validity  of the Shares  offered  hereby  will be passed  upon for
Exogen 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 Exogen.  Luci Staller  Altman,  a partner of Brobeck,  Phleger &
Harrison LLP, owns 500 shares of Common Stock of Exogen.


                                      -18-
<PAGE>


                                     EXPERTS

         The financial  statements and schedule  incorporated  by reference from
Exogen's Annual Report on Form 10-K for the fiscal year ended September 30, 1998
in this Prospectus and elsewhere in the registration statement have been audited
by Arthur Andersen LLP,  independent public  accountants,  as indicated in their
report  with  respect  thereto  and are  included  herein in  reliance  upon the
authority of said firm as experts in giving said report.
















                                      -19-
<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 Exogen, 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.......................................         3

Use of Proceeds....................................        15

Selected Consolidated Financial Data...............        16 
             
Selling Stockholder................................        17

Plan of Distribution...............................        17

Legal Matters......................................        18

Experts............................................        19


<PAGE>
                                 820,000 Shares
                              
                              
                              
                              
                              
                                  EXOGEN, INC.
                              
                              
                              
                              
                              
                                  Common Stock
                              
                              
                              
                              
                              
                                   PROSPECTUS
                              
                              
                              
                              
                              
                                 March 16, 1999

<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 Exogen 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.  Exogen 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.*

*  Previously filed.
<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.

                                      II-1
<PAGE>
         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
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.

                                      II-2
<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 16th
day of March 1999.

                               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 March 16, 1999:

                  Signature
                  ---------

By:      /s/John P. Ryaby
         ----------------
         John P. Ryaby, Chairman of the Board, Vice
         President, and Chief Scientific Officer


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

<PAGE>
                             EXHIBIT INDEX

Exhibit
  No.                      Description                                     Page
  ---                      -----------                                     ----

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 By-Laws 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*

*  Previously filed.





                                                                    EXHIBIT 23.1

                    CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS



As independent  public  accountants,  we hereby consent to the  incorporation by
reference of our report dated November 3, 1998 included in the Exogen, Inc. Form
10-K for the year ended  September 30, 1998 (and to all  references to our Firm)
included  in or  made a  part  of  this  Form  S-3  Registration  Statement  No.
333-64881.


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

New York, New York
March 10, 1999




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