INTEGRATED SURGICAL SYSTEMS INC
424B3, 1998-01-12
SURGICAL & MEDICAL INSTRUMENTS & APPARATUS
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<PAGE>   1
                                             As Filed Pursuant to Rule 424(b)(3)
                                             Registration No. 333-42051



 
PROSPECTUS
 
                                 619,355 SHARES
 
                       INTEGRATED SURGICAL SYSTEMS, INC.
 
                                  COMMON STOCK
 
     This Prospectus relates to the sale of 619,355 shares (the "Shares") of
common stock, par value $.01 per share ("Common Stock"), of Integrated Surgical
Systems, Inc., a Delaware corporation (the "Company"), by the selling
stockholders named herein (the "Selling Stockholders"). See "Selling
Stockholders." The Shares were acquired by the Selling Stockholders in exchange
for securities of Innovative Medical Machines International, S.A. ("IMMI") in
connection with the acquisition of IMMI by the Company on September 5, 1997.
 
     The Selling Stockholders may sell the Shares, subject to specified volume
limitations, from time to time directly to purchasers, or through broker-dealers
who may receive compensation in the form of commissions or discounts from the
Selling Stockholders or purchasers. Sales of the Shares may be effected by
broker-dealers in ordinary brokerage transactions or block transactions on The
Nasdaq SmallCap Market, the Pacific Exchange or the European Association of
Securities Dealers Automated Quotation ("EASDAQ") system, through sales to one
or more dealers who may resell as principals, in privately negotiated
transactions or otherwise, at the market price prevailing at the time of sale, a
price related to such prevailing market price or a negotiated price. Usual and
customary or specifically negotiated brokerage fees may be paid by the Selling
Stockholders in connection therewith. To the Company's knowledge, none of the
Selling Stockholders has entered into any underwriting arrangements for the sale
of the Shares. See "Plan of Distribution."
 
     The Company will not receive any proceeds from the sale of the Shares by
the Selling Stockholders.
 
     The Common Stock is quoted on The Nasdaq SmallCap Market under the symbol
"RDOC" and is listed on the Pacific Exchange under the symbol "ROB". The Common
Stock also has been admitted for trading on EASDAQ under the symbol "RDOC". On
January 7, 1998, the closing bid price of the Common Stock on The Nasdaq
Smallcap Market was $4 9/16 per share.
                            ------------------------
 
     THE SECURITIES OFFERED HEREBY ARE SPECULATIVE AND INVOLVE A HIGH DEGREE OF
RISK. FOR A DESCRIPTION OF CERTAIN RISKS REGARDING AN INVESTMENT IN THE COMPANY,
SEE "RISK FACTORS" COMMENCING ON PAGE 9.
 
THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
   EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE
     COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON THE
        ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO
                      THE CONTRARY IS A CRIMINAL OFFENSE.
                            ------------------------
 
     The Selling Stockholders may be deemed to be "underwriters" within the
meaning of the Securities Act of 1933 (the "Securities Act") and any profits
realized by them may be deemed to be underwriting commissions. Any
broker-dealers that participate in the distribution of the Shares also may be
deemed to be "underwriters", as defined in the Securities Act, and any
commissions or discounts paid to them, or any profits realized by them upon the
resale of any Shares purchased by them as principals, may be deemed to be
underwriting commissions or discounts under the Securities Act. The sale of the
Shares by the Selling Stockholders is subject to the prospectus delivery and
other requirements of the Securities Act.
 
     The Shares have been registered pursuant to registration rights granted to
the Selling Stockholders. All costs, expenses and fees in connection with the
registration of the Shares will be borne by the Company. The Selling
Stockholders are responsible for the payment of brokerage commissions and
discounts incurred in connection with the sale of the Shares. The Company has
agreed to indemnify the Selling Stockholders against certain liabilities,
including liabilities under the Securities Act.
 
                 The date of this Prospectus is January 8, 1998
<PAGE>   2
 
                       CAUTIONARY STATEMENT FOR PURPOSES
                     OF THE "SAFE HARBOR" PROVISIONS OF THE
                PRIVATE SECURITIES LITIGATION REFORM ACT OF 1995
 
     THIS DOCUMENT AND THE DOCUMENTS INCORPORATED HEREIN BY REFERENCE CONTAIN
FORWARD-LOOKING STATEMENTS OF MANAGEMENT OF THE COMPANY, INCLUDING REVENUE
PROJECTIONS. FORWARD-LOOKING STATEMENTS ARE STATEMENTS THAT ESTIMATE THE
HAPPENING OF FUTURE EVENTS, ARE NOT BASED ON HISTORICAL FACT AND ARE
"FORWARD-LOOKING STATEMENTS" WITHIN THE MEANING OF THE PRIVATE SECURITIES
LITIGATION REFORM ACT OF 1995. FORWARD-LOOKING STATEMENTS MAY BE IDENTIFIED BY
THE USE OF FORWARD-LOOKING TERMINOLOGY SUCH AS "MAY", "WILL", "EXPECT",
"ESTIMATE", "ANTICIPATE", "PROBABLE", "CONTINUE", OR SIMILAR TERMS, VARIATIONS
OF THOSE TERMS OR THE NEGATIVE OF THOSE TERMS. THE "RISK FACTORS" SET FORTH IN
THIS DOCUMENT CONSTITUTE CAUTIONARY STATEMENTS IDENTIFYING IMPORTANT FACTORS
THAT COULD CAUSE ACTUAL RESULTS TO DIFFER MATERIALLY FROM THOSE IN THE
FORWARD-LOOKING STATEMENT IDENTIFYING IMPORTANT FACTORS THAT COULD CAUSE ACTUAL
RESULTS TO DIFFER MATERIALLY FROM THOSE IN THE FORWARD-LOOKING STATEMENTS. THE
FORWARD-LOOKING STATEMENTS CONTAINED IN THIS DOCUMENT AND DOCUMENTS INCORPORATED
HEREIN BY REFERENCE HAVE BEEN COMPILED BY MANAGEMENT OF THE COMPANY ON THE BASIS
OF ASSUMPTIONS MADE BY MANAGEMENT AND CONSIDERED BY MANAGEMENT TO BE REASONABLE.
FUTURE OPERATING RESULTS OF THE COMPANY, HOWEVER, ARE IMPOSSIBLE TO PREDICT AND
NO REPRESENTATION, GUARANTY, OR WARRANTY IS TO BE INFERRED FROM THOSE
FORWARD-LOOKING STATEMENTS. THEREFORE, PROSPECTIVE PURCHASERS OF SHARES OF
COMMON STOCK ARE URGED TO CONSULT WITH THEIR ADVISORS (THE OPINIONS OF WHICH MAY
DIFFER FROM THOSE SPECIFIED IN THOSE FORWARD-LOOKING STATEMENTS) WITH RESPECT TO
THOSE ASSUMPTIONS OR HYPOTHESES.
 
     THE ASSUMPTIONS USED FOR PURPOSES OF THE FORWARD-LOOKING STATEMENTS
CONTAINED IN THIS DOCUMENT AND THE DOCUMENTS INCORPORATED HEREIN BY REFERENCE,
INCLUDING THOSE REVENUE PROJECTIONS, REPRESENT ESTIMATES OF FUTURE EVENTS AND
ARE SUBJECT TO UNCERTAINTY AS TO POSSIBLE CHANGES IN ECONOMIC, LEGISLATIVE,
INDUSTRY, AND OTHER CIRCUMSTANCES. AS A RESULT, THE IDENTIFICATION AND
INTERPRETATION OF DATA AND OTHER INFORMATION AND THEIR USE IN DEVELOPING AND
SELECTING ASSUMPTIONS FROM AND AMONG REASONABLE ALTERNATIVES REQUIRE THE
EXERCISE OF JUDGMENT. TO THE EXTENT THAT THE ASSUMED EVENTS DO NOT OCCUR, THE
OUTCOME MAY VARY SUBSTANTIALLY FROM ANTICIPATED OR PROJECTED RESULTS, AND
ACCORDINGLY, NO OPINION IS EXPRESSED ON THE ACHIEVABILITY OF THOSE
FORWARD-LOOKING STATEMENTS, INCLUDING THOSE REVENUE PROJECTIONS.
 
     THESE FORWARD-LOOKING STATEMENTS, INCLUDING THESE REVENUE PROJECTIONS, HAVE
BEEN COMPILED AS OF THE DATE OF THIS DOCUMENT OR THE DATE OF THE DOCUMENTS
INCORPORATED HEREIN BY REFERENCE, AS THE CASE MAY BE, AND SHOULD BE EVALUATED
WITH CONSIDERATION OF ANY CHANGES OCCURRING AFTER THE DATE HEREOF OR THEREOF. NO
ASSURANCE CAN BE GIVEN THAT ANY OF THE ASSUMPTIONS RELATING TO THE
FORWARD-LOOKING STATEMENTS CONTAINED IN THIS DOCUMENT OR IN ANY DOCUMENT
INCORPORATED HEREIN BY REFERENCE, INCLUDING THOSE REVENUE PROJECTIONS, ARE
ACCURATE OR THAT THEY WILL PROVE TO BE APPLICABLE TO A PARTICULAR PURCHASER OF
THE SHARES OF COMMON STOCK. IT IS THE RESPONSIBILITY OF THE PURCHASERS OF THE
COMMON STOCK AND THEIR ADVISORS TO REVIEW THOSE FORWARD-LOOKING STATEMENTS,
INCLUDING THOSE REVENUE PROJECTIONS, TO CONSIDER THE ASSUMPTIONS ON WHICH THOSE
FORWARD-LOOKING STATEMENTS ARE BASED AND TO ASCERTAIN THEIR REASONABLENESS.
 
                                        2
<PAGE>   3
 
     NO DEALER, SALESMAN OR OTHER PERSON HAS BEEN AUTHORIZED TO GIVE ANY
INFORMATION OR TO MAKE ANY REPRESENTATION IN CONNECTION WITH THIS OFFERING OTHER
THAN THOSE CONTAINED IN THIS PROSPECTUS AND, IF GIVEN OR MADE, SUCH OTHER
INFORMATION AND REPRESENTATIONS MUST NOT BE RELIED UPON AS HAVING BEEN
AUTHORIZED BY THE COMPANY. NEITHER THE DELIVERY OF THIS PROSPECTUS NOR ANY SALE
MADE HEREUNDER SHALL UNDER ANY CIRCUMSTANCES CREATE ANY IMPLICATION THAT THERE
HAD BEEN NO CHANGE IN THE AFFAIRS OF THE COMPANY SINCE THE DATE HEREOF. THIS
PROSPECTUS DOES NOT CONSTITUTE AN OFFER TO SELL OR THE SOLICITATION OF AN OFFER
TO BUY ANY SECURITIES OFFERED HEREBY BY ANYONE IN JURISDICTIONS IN WHICH SUCH
OFFER OR SOLICITATION IS NOT AUTHORIZED OR IN WHICH THE PERSON MAKING SUCH OFFER
OR SOLICITATION IS NOT QUALIFIED TO DO SO OR TO ANYONE TO WHOM IT IS UNLAWFUL TO
MAKE SUCH OFFER OR SOLICITATION.
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                                        PAGE
                                                                                        ----
<S>                                                                                     <C>
Available Information.................................................................    4
Information Incorporated by Reference.................................................    4
Prospectus Summary....................................................................    5
Risk Factors..........................................................................    9
Selling Stockholders..................................................................   21
Plan of Distribution..................................................................   22
Legal Matters.........................................................................   23
Experts...............................................................................   23
</TABLE>
 
                                        3
<PAGE>   4
 
                             AVAILABLE INFORMATION
 
     The Company is subject to the reporting requirements of the Securities
Exchange Act of 1934 (the "Exchange Act"), and, in accordance therewith, files,
reports, proxy and information statements and other information with the
Securities and Exchange Commission (the "Commission"). The Company has filed a
Registration Statement on Form S-3 under the Securities Act with the Commission
in Washington, D.C. with respect to the shares of Common Stock offered hereby.
This Prospectus, which is part of the Registration Statement, does not contain
all of the information set forth in the Registration Statement and the exhibits
thereto. For further information with respect to the Company and the shares
offered hereby, reference is made to the Registration Statement and such
exhibits as well as the reports, proxy and information statements and other
information filed under the Exchange Act, which may be inspected and copied at
the Public Reference Section of the Commission at Room 1024, Judiciary Plaza,
450 Fifth Street, N.W., Washington, D.C. 20549 and at the following regional
offices: New York Regional Office, Suite 1300, 7 World Trade Center, New York,
New York 10048, and Chicago Regional Office, 500 West Madison Street, Suite
1400, Chicago, Illinois 60661-2511, and copies of such material may also be
obtained from the Public Reference Section of the Commission at prescribed
rates. The Commission maintains a Web site (http://www.sec.gov) that contains
reports, proxy and information statements and other information regarding
registrants that file electronically.
 
                     INFORMATION INCORPORATED BY REFERENCE
 
     The following documents filed with the Commission are incorporated into
this Prospectus by reference:
 
          (1) The Company's Prospectus dated November 14, 1997, filed pursuant
              to Rules 424(b)(1) and 430A promulgated under the Securities Act.
 
          (2) The Company's Annual Report on Form 10-KSB for the fiscal year
              ended December 31, 1996.
 
          (3) The Company's Quarterly Reports on Form 10-QSB for the fiscal
              quarters ended March 31, 1997, June 30, 1997 and September 30,
              1997, respectively.
 
          (4) The Company's Current Report on Form 8-K dated September 5, 1997,
              as amended.
 
          (5) The description of the Common Stock set forth in the Company's
              Registration Statement on Form 8-A (File No. 1-12471), filed
              pursuant to Section 12(b) of the Exchange Act, and any amendment
              or report filed for the purpose of updating such description.
 
     All documents filed by the Company pursuant to Sections 13(a), 13(c), 14
and 15(d) of the Exchange Act subsequent to the date of this Prospectus and
prior to the termination of the offering made hereby shall be deemed to be
incorporated by reference herein and to be a part hereof from the date of filing
of such documents. Any statement contained in a document incorporated or deemed
to be incorporated by reference 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 such statement so modified or superseded shall not be deemed,
except as so modified or superseded, to constitute a part of this Prospectus.
 
     The Company will provide without charge to each person to whom a Prospectus
is delivered upon written or oral request of such person, a copy of any
documents incorporated herein by reference (other than exhibits to such
documents unless such exhibits are specifically incorporated by reference into
the documents that this Prospectus incorporates). Requests for copies of such
documents should be directed to the Company, 829 West Stadium Lane, Sacramento,
California 95834, Attention: Corporate Secretary (telephone (916)646-3487; fax
(916)646-4075).
 
                                        4
<PAGE>   5
 
                               PROSPECTUS SUMMARY
 
     The following summary is qualified in its entirety by the more detailed
information, financial statements and the notes thereto appearing elsewhere in,
or incorporated by reference into, this Prospectus. Unless otherwise indicated
or the context otherwise requires, (i) all references to the Company in this
Prospectus include Integrated Surgical Systems, Inc., a Delaware corporation,
and its wholly owned subsidiaries, except that information concerning the
Company prior to September 5, 1997, does not include Innovative Medical Machines
International, S.A. ("IMMI"), acquired by the Company on that date, and (ii) all
share and per share data and information in this Prospectus relating to the
number of shares of Common Stock outstanding give effect to a one-for-five
reverse stock split with respect to the Company's capital stock effected on
December 20, 1995, and a one-for-1.479586 reverse stock split with respect to
the Common Stock effected on November 6, 1996.
 
                                  THE COMPANY
 
     Integrated Surgical Systems, Inc. develops, assembles, markets and services
image-directed, computer-controlled robotic products for surgical applications.
The Company's principal products are the ROBODOC(R) Surgical Assistant System
(the "ROBODOC System"), consisting of a computer-controlled surgical robot and
the Company's ORTHODOC(R) Presurgical Planner (the "ORTHODOC"), and as a result
of the acquisition of IMMI, the NeuroMate System, consisting of a computer
controlled robotic arm, head stabilizer and monitor (the ROBODOC System and the
NeuroMate System are sometimes referred to collectively as the "Systems").
 
     The ROBODOC System has been used for primary total hip replacement ("THR")
surgery on over 1,500 patients in Europe and the United States. The Company
believes its "active" robotic system is the only available system that can
accurately perform key segments of surgical procedures with precise tolerances
generally not attainable by traditional manual surgical techniques. The ROBODOC
System also allows the surgeon to prepare a preoperative plan specifically
designed for the characteristics of the individual patient's anatomy. The
technology for the ROBODOC System was initially developed at the University of
California, Davis, in collaboration with International Business Machines
Corporation ("IBM"). IBM has rights to acquire approximately 20% of the Common
Stock on a fully diluted basis.
 
     The ORTHODOC is a computer workstation that utilizes the Company's
proprietary software for preoperative surgical planning. The ORTHODOC is
included as part of the ROBODOC System, but is also planned to be marketed
separately by the Company. The ORTHODOC converts computerized tomography ("CT")
scan data of a patient's femur (i.e., thigh bone) into three-dimensional images,
and through a graphical user interface allows the surgeon to examine the bone
more thoroughly and to select the optimal implant for the patient using a
built-in library of available implants. A tape of the planned surgical
procedure, developed by the ORTHODOC, guides the surgical robot arm of the
ROBODOC System to accurately mill a cavity in the bone, thus allowing the
surgeon to properly orient and align the implant. Non-clinical scientific data
published by scientists from the Company and IBM demonstrate that as a result of
the precise milling of a cavity, the ROBODOC System achieves over 95%
bone-to-implant contact, as compared to an average of 20% bone-to-implant
contact when surgery is performed manually.
 
     THR surgery involves the insertion of an implant or metal prosthesis into a
cavity created in the patient's femur. The Company believes that precise fit and
correct alignment of the implant within the femoral cavity are key factors in
the long-term success of THR surgery. In conventional THR surgery, a bone cavity
is cut in the shape of the implant manually with metal tools, and the surgical
plan, including the selection of the size and shape of the implant, is generally
formulated based upon patient data obtained from two-dimensional x-ray images of
the patient's femur. Based upon clinical experience with the ROBODOC System to
date in Europe, patients generally have become weight-bearing in a shorter
period than generally experienced by patients who have had this surgery
performed manually. In addition, clinical data obtained from trials in Europe
and the United States indicates that intraoperative fractures have been
dramatically reduced in THR surgeries performed with the ROBODOC System (no
intraoperative fractures have resulted from THR surgeries performed with the
ROBODOC System to date). The Company also believes fewer hip revision
 
                                        5
<PAGE>   6
 
surgeries (implant replacements) may be necessary for patients who have had
primary THR surgery performed with the ROBODOC System, as compared to patients
who have had this surgery performed manually.
 
     The NeuroMate System has been used to perform over 1,500 neurosurgical
procedures in Europe and Japan. The Company believes that the NeuroMate System,
which uses its proprietary robotic arm design and control systems designed
specifically for use in the operating room, is the only image-guided, computer-
controlled stereotactic robot currently in use to precisely position and hold
critical tools used in the performance of neurosurgical procedures. Stereotactic
neurosurgery is a minimally invasive approach to operating on the brain. Because
the brain is largely unexposed, it requires the surgeon to work without direct
visualization of the brain itself. This is overcome by a thorough understanding
of brain anatomy and by using a spatial coordinate system that allows the
surgeon to "navigate" within the brain without directly visualizing it.
Essentially, the coordinate space of the patient's brain is correlated to the
patient's own CT, magnetic resonance (MR) or other images by using anatomical
landmarks that are shared by the patient and the images. This is known as
"registration" of the patient's coordinate space to the coordinate space of the
images. Once this is accomplished, the patient's CT scan can be used to guide
the surgeon to specific sites within the brain through small holes the surgeon
has made in the cranium (i.e.,not necessitating a craniotomy).
 
     The Company is seeking to establish itself as a leading provider of
innovative image-directed, computer-controlled robotic technologies worldwide,
initially for orthopaedic and neurosurgical applications and subsequently for
other surgical applications. The Company's business strategy over the next two
years is to concentrate its marketing and sales efforts on selling the ROBODOC
System throughout Europe and then Japan, subject to obtaining the requisite
approval from the Japanese Ministry of Health, and selling the NeuroMate System
throughout Europe, Japan and the United States. The Company will thereby attempt
to establish an installed customer base in the United States, Europe, Japan and
other foreign markets through the sale of its systems, and offer its customers
separate software packages for each new application if, as and when developed by
the Company. Consequently, the Company's customers would be able to use the
ROBODOC System as the platform for performing a variety of orthopaedic surgical
procedures, and the NeuroMate System as the platform for performing a variety of
neurosurgical procedures, without incurring significant additional hardware
costs. The Company also plans to further exploit its image-directed robotics
technology by incorporating additional imaging modalities for presurgical
planning, including ultrasound (which is less expensive than CT) and MRI (which,
unlike CT, does not involve the risk of radiation).
 
     The Company markets the ROBODOC System in Europe through direct marketing
and arrangements with implant companies. The ROBODOC System satisfies the
appropriate international standards for medical equipment and meets the
requirements for the European conformity mark ("CE Mark"). The Company markets
the NeuroMate through direct marketing in Europe and through its distributor in
Japan. It is anticipated that marketing of the NeuroMate in the United States
will commence in early 1998 through a combination of direct marketing and select
distributors/agents. During the nine months ended September 30, 1997, the
Company realized revenues of approximately $2,818,000 from the commercial sales
of the ROBODOC System (including related consumables) in Europe.
 
     The Company has developed a software package, in collaboration with IBM and
Johns Hopkins University, for surgery to replace loose or otherwise failed hip
implants (the "hip revision application") using the ROBODOC System. The Company
has completed clinical evaluations of the hip revision application in Europe and
plans to commence marketing the software for the hip revision application to its
customers in Europe in early 1998. The development of the hip revision
application has been funded in part by a grant from the National Institute for
Standards and Technology (Advanced Technology Program) of the United States
Department of Commerce.
 
     The ROBODOC System cannot be marketed in the United States until clearance
or approval is obtained from the U.S. Food and Drug Administration ("FDA"). The
Company previously announced its intention to submit a pre-market approval
application ("PMA") to the FDA in late 1997 for approval to market the ROBODOC
System in the United States. The Company currently is exploring a regulatory
strategy that may allow the Company to pursue FDA clearance of the ROBODOC
System through a 510(k) submission in lieu
 
                                        6
<PAGE>   7
 
of a PMA application, which would be a less onerous and lengthy regulatory path
if such an approach were acceptable to the FDA. Pursuant to this strategy, the
Company has provided the FDA with certain clinical and radiographic data from
the U.S. clinical trial and European studies and has requested a pre-filing
meeting with FDA representatives to elicit the FDA's view as to whether a 510(k)
clearance pathway is a viable alternative to a PMA application for the ROBODOC
System. There can be no assurance that the Company will obtain clearance or
approval to market the ROBODOC System in the United States. See "Risk
Factors -- Government Regulation."
 
     The Company has received clearance from the FDA to sell the ORTHODOC in the
United States, and intends to commence marketing the ORTHODOC in the United
States in early 1998. See "Risk Factors -- Available Clinical Data; Risk Versus
Benefit Issues" and "Risk Factors -- Government Regulation."
 
     The NeuroMate System has received clearance from the FDA for marketing in
the United States and from the Japanese Ministry of Health for marketing in
Japan. It also satisfies the relevant provisions of the European Medical Device
Directive for Class II Medical Devices, thus allowing the Company to apply the
"CE Mark."
 
     On November 20, 1997, the Company received net proceeds of approximately
$8,800,000 from the sale of 1,500,000 shares of Common Stock in an offering to
European investors (the "European Offering") for which CA IB Investmentbank
Aktiengesellschaft ("CA IB") was the lead manager and K-B Securities N.V. was
co-manager.
 
     The Company was incorporated under the laws of the State of Delaware on
October 1, 1990. The Company's offices are located at 829 West Stadium Lane,
Sacramento, California 95834, and its telephone number is (916) 646-3487.
 
                                  THE OFFERING
 
Securities Offered.........  619,355 shares of Common Stock by the Selling
                             Stockholders. See "Selling Stockholders" and "Plan
                             of Distribution."
 
Common Stock
Outstanding(1).............  5,503,390 shares of Common Stock.
 
Risk Factors...............  The securities offered hereby involve a high degree
                             of risk. Only investors who can bear the loss of
                             their entire investment should invest. See "Risk
                             Factors."
 
Nasdaq SmallCap Market
  Symbol...................  RDOC
 
Pacific Exchange Symbol....  ROB
 
EASDAQ Symbol..............  RDOC
- ---------------
(1) Does not include (i) 4,507,816 shares of Common Stock issuable upon the
    exercise of warrants at exercise prices ranging from $.01 to $8.34, and (ii)
    1,218,556 shares of Common Stock issuable upon exercise of outstanding
    options granted pursuant to the Company's stock option plans at exercise
    prices ranging from $0.07 to $8.75 per share.
 
                                        7
<PAGE>   8
 
                 SUMMARY OF CONSOLIDATED FINANCIAL INFORMATION
 
     The summary financial information set forth below is derived from and
should be read in conjunction with the Company's consolidated financial
statements and unaudited pro forma combined condensed financial statements,
including the notes thereto, incorporated by reference into this Prospectus. The
historical summary financial information set forth below includes the results of
operations of IMMI for the period subsequent to its acquisition by the Company
on September 5, 1997.
 
STATEMENT OF OPERATIONS DATA:
 
<TABLE>
<CAPTION>
                                                                                                                   PRO FORMA
                                                                   PRO FORMA                                       COMBINED
                                          YEAR ENDED               COMBINED            NINE MONTHS ENDED          NINE MONTHS
                                         DECEMBER 31,             YEAR ENDED             SEPTEMBER 30,               ENDED
                                  ---------------------------      DECEMBER       ---------------------------     SEPTEMBER 30,
                                     1995            1996         31, 1996(2)        1996            1997           1997(2)
                                  -----------     -----------     -----------     -----------     -----------     -----------
<S>                               <C>             <C>             <C>             <C>             <C>             <C>
  Net sales.....................  $   174,521     $ 2,280,311     $ 2,727,621     $ 1,748,065     $ 2,818,262     $ 3,438,323
  Gross profit..................      104,342       1,396,159       1,642,587       1,083,086       1,701,685       2,034,145
  Operating loss................   (3,925,730)     (3,495,861)     (5,218,358)     (2,168,228)     (2,998,831)     (3,360,242)
  Net loss......................   (4,053,528)     (3,448,829)     (5,176,800)     (2,122,377)     (2,851,419)     (3,153,217)
  Net loss applicable to common
    stockholders................   (4,989,853)     (3,448,829)     (5,176,800)     (2,122,377)     (2,851,419)     (3,153,217)
  Net loss per common and common
    share equivalent............       $(1.19)         $(0.79)         $(1.04)         $(0.48)         $(0.83)         $(0.78)
  Shares used in per share
    calculations(1).............    4,178,877       4,373,947       4,993,302       4,377,679       3,422,703       4,042,058
</TABLE>
 
BALANCE SHEET DATA:
 
<TABLE>
<CAPTION>
                                                                       SEPTEMBER 30, 1997
                                                                  -----------------------------
                                                                     ACTUAL        PRO FORMA(3)
                                                                  ------------     ------------
<S>                                                               <C>              <C>
  Working capital...............................................  $  2,648,744     $ 11,475,367
  Total assets..................................................    10,367,637       19,194,260
  Accumulated deficit...........................................   (21,952,230)     (21,952,230)
  Stockholders' equity..........................................     7,557,365       16,383,988
</TABLE>
 
- ---------------
(1) See Note 2 of notes to December 31, 1996 consolidated financial statements
    incorporated by reference into this Prospectus for an explanation of the
    determination of the number of shares used in computing net loss per share.
 
(2) Gives effect to the acquisition of IMMI using the purchase method of
    accounting as of January 1, 1996 for statement of operations data. The pro
    forma information is presented for illustrative purposes only and may not be
    indicative of the results that would have been obtained had the transaction
    actually occurred on the date assumed nor is it necessarily indicative of
    the future combined results of operations. See the unaudited Pro Forma
    Combined Condensed Financial Statements incorporated by reference into this
    Prospectus.
 
(3) Gives effect to the issuance and sale of 1,500,000 shares of Common Stock in
    the European Offering.
 
                                        8
<PAGE>   9
 
                                  RISK FACTORS
 
     The shares of Common Stock offered hereby are speculative and involve a
high degree of risk, including, but not limited to, the risk factors described
below. Each prospective investor should carefully consider the following risk
factors before making an investment decision.
 
     HISTORY OF LOSSES; ACCUMULATED DEFICIT; ANTICIPATED FUTURE LOSSES.  Since
its inception, the Company has incurred losses. The Company incurred a net loss
of approximately $3,449,000 (on net sales of approximately $2,280,000) for its
fiscal year ended December 31, 1996 and a net loss of approximately $4,054,000
(on net sales of approximately $175,000) for its fiscal year ended December 31,
1995. In addition, the Company incurred a net loss of approximately $2,851,000
(on net sales of approximately $2,818,000) for the nine months ended September
30, 1997, as compared to a net loss of approximately $2,122,000 (on net sales of
approximately $1,748,000), for the nine months ended September 30, 1996. IMMI
also has incurred losses since its inception, including a net loss of
approximately $910,000 (on net sales of approximately $447,000) for its fiscal
year ended December 31, 1996, and a net loss of approximately $27,000 (on net
sales of approximately $618,000) for the six months ended June 30, 1997, as
compared to a net loss of approximately $423,000 (on net sales of approximately
$147,000) for the six months ended June 30, 1996. At September 30, 1997, the
Company's accumulated deficit was approximately $21,952,000 and at June 30, 1997
IMMI's accumulated deficit was approximately $1,605,000, in each case as a
result of continuing losses. The Company expects to continue to incur operating
losses until such time, if ever, as it derives significant revenues from the
sale of its products. The Company's ability to operate profitably depends upon
market acceptance of its orthopaedic and neurosurgical products, the development
of an effective sales and marketing organization, and the development of new
products and improvements to existing products. There can be no assurance that
the Company will obtain FDA approval to market the ROBODOC System in the United
States or that its products will achieve market acceptance in the United States,
Europe and other foreign markets to generate sufficient revenues to become
profitable. See "Risk Factors -- Dependence on Principal Product,"
"-- Uncertainty of Market Acceptance," "-- Available Clinical Data; Risk Versus
Benefit Issues" and
"-- Government Regulation."
 
     LIMITED OPERATING HISTORY.  Although the Company commenced operations in
October 1990, its operations have consisted primarily of the development and
clinical testing of the ORTHODOC and the ROBODOC System, the organization of its
manufacturing facility, the hiring of key personnel and the formulation of a
plan for marketing the ROBODOC System in Europe. Although commercial sales of
the ROBODOC System have been made in Europe, the Company has engaged only in
clinical testing of the ROBODOC System in the United States, and the Company's
ability to market the ROBODOC System in the United States is dependent upon FDA
approval. See "Risk Factors -- Government Regulation." Accordingly, the Company
must be evaluated in light of the uncertainties, delays, difficulties and
expenses commonly experienced by companies in the early operating stage, which
generally include unanticipated problems and additional costs relating to the
development and testing of products, product approval or clearance, regulatory
compliance, commencement of production, product introduction and marketing, and
competition. Many of these factors may be beyond the Company's control,
including but not limited to unanticipated results of product tests requiring
modification in product design, changes in applicable government regulations or
the interpretation thereof, market acceptance of the Company's products and
development of competing products by others. In addition, the Company's future
performance also will be subject to other factors beyond the Company's control,
including general economic conditions and conditions in the healthcare industry
or targeted commercial markets. See "Risk Factors -- Dependence on Principal
Product," "-- Uncertainty of Market Acceptance," "-- Competition," "-- Available
Clinical Data; Risk Versus Benefit Issues" and "-- Government Regulation."
 
     LENGTHY SALES CYCLE.  Since the purchase of a ROBODOC System or NeuroMate
System represents a significant capital expenditure for a customer, the
placement of orders may be delayed due to customers' internal procedures to
approve large capital expenditures. The Company anticipates that the period
between initial contact of a customer for a System and submission of a purchase
order by that customer could be as long as 9 to 12 months. Furthermore, the
current lead time required by the supplier of the robot for either the ROBODOC
System or the NeuroMate System is approximately four months after receipt of the
order. Although the Company generally intends to require a deposit upon receipt
of an order for a System, the
 
                                        9
<PAGE>   10
 
Company may be required to expend significant cash resources to fund its
operations until the balance of the purchase price is paid. Accordingly, a
significant portion of the sales price of a System may not be recognized until a
fiscal quarter subsequent to the fiscal quarter in which the Company incurred
marketing and sales expenses associated with that order.
 
     CHALLENGES OF GROWTH.  The Company intends to use a portion of the net
proceeds of the European Offering to hire and retain sales and marketing,
research and development and technical personnel to increase and support sales
of Systems and to develop additional surgical applications for its orthopaedic
and neurosurgical systems. The anticipated growth of the Company will likely
result in new and increased responsibilities for management personnel and place
significant strain upon the Company's management, operating and financial
systems and resources. To accommodate such growth and compete effectively, the
Company must continue to implement and improve its operational, financial,
management and information systems, procedures and controls, and to expand,
train, motivate and manage its personnel. There can be no assurance that the
Company's personnel, systems, procedures and controls will be adequate to
support the Company's future operations. Any failure to implement and improve
the Company's operational, financial, management and information systems,
procedures or controls, or to expand, train, motivate or manage employees, could
materially and adversely affect the Company's business, financial condition and
results of operations.
 
     DEPENDENCE ON PRINCIPAL PRODUCT.  For the near term, the Company expects to
derive most of its revenues from sales of the ROBODOC System. Accordingly, the
Company's potential future success and financial performance will depend almost
entirely on its ability to successfully market its ROBODOC System. If the
Company is unable to obtain the requisite regulatory approvals or to achieve
commercial acceptance of its ROBODOC System, the Company's business, financial
condition and results of operations will be materially and adversely affected.
The Company has not obtained, and there can be no assurance that the Company
will obtain, clearance or approval to market the ROBODOC System in the United
States. See "Risk Factors -- Government Regulation."
 
     UNCERTAINTY OF MARKET ACCEPTANCE.  The Company's ability to successfully
commercialize its Systems will require substantial marketing efforts and the
expenditure of significant funds to inform potential customers, including
hospitals and physicians, of its distinctive characteristics and the advantages
of using the Systems instead of traditional surgical tools and procedures. Since
the Systems employ innovative technology, rather than being an improvement of
existing technology, and represents a substantial capital expenditure, the
Company expects to encounter resistance to change, which it must overcome to
successfully market its products. Failure of the Systems to achieve significant
market acceptance would materially and adversely affect the Company's business,
financial condition and results of operations.
 
     COMPETITION.  The principal competition for the ROBODOC System is manual
surgery performed by orthopaedic surgeons, using surgical power tools and manual
devices. The providers of these instruments are the major orthopaedic companies,
which include Howmedica, Inc. (a subsidiary of Pfizer, Inc.), located in New
York; Zimmer, Inc. (a subsidiary of Bristol-Myers Squibb Company), located in
Indiana; Johnson & Johnson Orthopaedics, Inc. (a subsidiary of Johnson &
Johnson), located in New Jersey; DePuy, Inc. located in Indiana; Biomet, Inc.,
located in Indiana; and Osteonics, Inc. (a subsidiary of the Stryker
Corporation), located in New Jersey. MAQUET, a manufacturer of operating tables
located in Germany, has recently announced that it intends to market a device
similar to the ROBODOC System in mid 1998. The principal competition for the
NeuroMate System are frame-based and frameless navigators, which are manually
operated. Approximately twenty navigator models have been introduced, including
those by Radionics, Sofamor-Danek and Ohio Medical Surgical products, all
located in the United States; Elekta, located in Sweden; and Fischer Leibingher
and Brain Lab, both located in Germany. In general, there are companies in the
medical products industry capable of developing and marketing
computer-controlled robotic systems for surgical applications, many of whom have
significantly greater financial, technical, manufacturing, marketing and
distribution resources than the Company, and have established reputations in the
medical device industry. Furthermore, there can be no assurance that IBM or the
University of California, which developed the technology embodied in the ROBODOC
System and hold patents relating thereto, will not enter the market or license
the technology to other companies.
 
                                       10
<PAGE>   11
 
     There can be no assurance that future competition will not have a material
adverse effect on the Company's business. The cost of the Systems represents a
significant capital expenditure for a customer and accordingly may discourage
purchases by certain customers.
 
     AVAILABLE CLINICAL DATA; RISK VERSUS BENEFIT ISSUES.  The Company has
conducted a randomized clinical trial for the ROBODOC System in the United
States at three centers. Of the 120 patients enrolled in the U.S. clinical
study, 71 hips received treatment with the ROBODOC System and 65 hips in a
control group received conventional THR surgery. In addition, at least 1,400
patients have received treatment with the ROBODOC System in Europe, although not
as a part of the formal U.S. clinical study and without comparison to randomized
control patients.
 
     In order to obtain FDA clearance or approval, the Company will be required
to demonstrate that the ROBODOC System is safe and effective. This can include a
requirement to show a clinical benefit to patients. The Company believes that a
reduced incidence of intraoperative fractures with the ROBODOC System compared
to conventional THR surgery would offer an important benefit. The number of
patients enrolled in the U.S. clinical study is less than the 300 patients (150
ROBODOC System; 150 control group) initially requested to be studied by the
Company in its Investigational Device Exemption ("IDE") application to the FDA.
Nonetheless, there have been at least 1,500 primary THR surgeries performed with
the ROBODOC System in the combined U.S. clinical trial and the European study
without a single intraoperative fracture. Since the observed fracture rate in
the control group in the U.S. clinical trial was lower than anticipated, the
data from this study are not sufficient to establish a statistically significant
reduction in intraoperative fractures compared to the control group.
Nevertheless, the data from both the U.S. trial and the European study suggest
that the ROBODOC System reduces intraoperative fractures when compared to the
fracture rate of approximately 6 to 24 percent for conventional THR surgery
reported in the scientific and medical literature. There can be no assurance,
however, that the FDA will agree that the ROBODOC System offers a clinically
significant reduction in intraoperative fractures, in the absence of a
controlled trial demonstrating such a reduction.
 
     The FDA has advised the Company that the agency believes long-term
functional and pain assessments are the primary endpoints for evaluating the
safety and effectiveness of the ROBODOC System. A preliminary review by the
Company of the functional and pain assessment data from the U.S. clinical trial
shows equivalence between the ROBODOC System and conventional THR surgery. The
Company believes that achieving better implant fit and alignment in the femoral
cavity are significant factors in the success of cementless THR surgery,
although the FDA has questioned whether fit is an appropriate endpoint and has
not addressed alignment.
 
     The Company's preliminary comparison completed in May 1997 of fit and
alignment parameters from the 3 month radiographs showed that the ROBODOC System
surgeries produced fit and alignment equivalent to conventional THR surgeries.
Subsequently, the Company's outside radiologist and outside biostatistician have
refined the analytical technique applied to the 3-month radiographic data in a
manner that the Company believes more accurately reflects the implant
manufacturers' design goals for implant cavity preparation. Based upon the
preliminary results of this technique, the Company believes that the data will
show that the ROBODOC System achieves better fit and alignment compared to
conventional THR surgeries. The Company also will be reviewing long term fit and
alignment. Although the Company believes that the refined technique produces a
more appropriate comparison, there can be no assurance that the FDA will accept
the Company's methodology for measuring fit and alignment, that the data, once
fully reviewed and analyzed, will demonstrate that the ROBODOC System achieves
better implant fit and alignment, or that the FDA will agree that better fit and
alignment are significant surgical endpoints. In addition, there can be no
assurance that the FDA will agree that the greater surgery time and blood loss
associated with the ROBODOC System does not pose a significant safety concern or
create an unfavorable risk/benefit ratio. Further, no assurance can be given
that the FDA will not require the Company to obtain additional clinical data
from a randomized, controlled trial to resolve any concern about the
risk/benefit ratio offered by the ROBODOC System. If the Company were required
to obtain such additional data, the FDA review process could be prolonged by
several years.
 
                                       11
<PAGE>   12
 
     In prior communications with the Company, the FDA indicated a strong
"preference" for two year post-operative data from patients participating in the
U.S. clinical trial, although in a late 1996 meeting the FDA indicated that it
may accept a PMA application for filing with only two year post-operative data
on some patients and permit the Company to submit the additional post-operative
data while the PMA application is under review. However, there can be no
assurance that the FDA will not require complete two-year post-operative data on
all patients participating in the U.S. clinical trial before accepting a PMA
application for filing. The last patient who has received surgery in the U.S.
clinical trial will reach the two year post-operative mark in February 1998.
 
     In February 1995, a law firm specializing in FDA regulatory matters
examined an interim report of preliminary data and concluded that it was
doubtful that the FDA would find that the device was safe and effective for its
intended use, or provided a therapeutic benefit, sufficient to permit PMA
approval, if the FDA were presented with the then existing preliminary data or
future data qualitatively similar to the preliminary data. The Company believes
that the additional data analyzed subsequent to the law firm's February 1995
report address many of the concerns identified in that report. These data and
analyses include non-radiographic clinical follow-up data from the U.S. trial,
preliminary analysis and review by an outside radiologist and an outside
biostatistician of 3-month radiographic films from the U.S. trial, and data on
additional patients from the European studies. The Company also is in the
process of collecting 12-month and 24-month follow-up clinical (including
radiological) data for patients in the U.S. clinical trial and obtaining
analyses and review from the outside consultants. There can be no assurance that
the data, once fully analyzed and reviewed, will demonstrate that the ROBODOC
System is safe and effective for its intended use, provides a therapeutic
benefit, or has an acceptable risk/benefit ratio in light of increased surgery
time and intraoperative blood loss. In addition, the Company's Director of
Regulatory Affairs and Quality Assurance resigned in September 1996 and
subsequently has asserted that one of the reasons for his resignation was his
concern, similar to that expressed in the February 1995 law firm report, about
the adequacy of the Company's clinical data to support product approval. See
"Risk Factors -- Government Regulation -- U.S. Regulation -- FDA Review Process
for ROBODOC System."
 
     If the FDA concludes that the existing clinical data are insufficient to
establish the safety and efficacy of the ROBODOC System, the FDA could require
the Company to obtain additional clinical data from a randomized, controlled
trial, which could significantly delay completion of the PMA review process, and
which could accordingly have a material adverse effect on the Company's
business, financial condition and results of operations.
 
  GOVERNMENT REGULATION.
 
     Summary.  The Company's products are subject to continued and pervasive
regulation by the FDA and foreign and state regulatory authorities. In the
United States, the Company must comply with food and drug laws and with
regulations promulgated by the FDA. These laws and regulations require the
Company's products to obtain various authorizations prior to being marketed in
the United States, and there is no assurance the Company's products will receive
these authorizations. The Company's manufacturing facilities and practices will
also be subject to FDA regulations. In each foreign market, the Company's
products may be subject to substantially different regulations. Failure to
comply with U.S. or applicable foreign regulations could have a material adverse
effect on the Company.
 
  U.S. REGULATION.
 
     General.  Pursuant to the Federal Food, Drug, and Cosmetic Act, as amended,
and regulations thereunder (collectively, the "FDC Act"), the FDA regulates the
clinical testing, manufacture, labeling, sale, distribution and promotion of
medical devices in the United States. Noncompliance with applicable requirements
can result in, among other things, fines, injunctions, civil penalties, recall
or seizure of products, total or partial suspension of production, failure of
the government to grant pre-market clearance or pre-market approval for devices,
withdrawal of marketing clearances or approvals, and criminal prosecution. The
FDA also has the authority to request recall, repair, replacement or refund of
the cost of any device
 
                                       12
<PAGE>   13
 
manufactured or distributed by the Company. Failure to comply with regulatory
requirements, including any future changes to such requirements, could have a
material adverse effect on the Company's business, financial condition and
results of operation.
 
     FDA Review Process for ROBODOC System.  Before a new device can be
introduced into the U.S. market, the manufacturer must obtain FDA permission to
market through either the 510(k) pre-market notification process for medical
devices which are substantially similar to other approved medical devices or the
costlier, lengthier and less certain pre-market approval ("PMA") application
process. The Company previously announced its intention to submit a PMA in late
1997 for approval to market the ROBODOC System in the United States. The Company
currently is exploring a regulatory strategy that may allow the Company to
pursue FDA clearance of the ROBODOC System through a 510(k) submission in lieu
of a PMA application, which would be a less onerous and lengthy regulatory path
if such an approach were acceptable to the FDA. Pursuant to this strategy, the
Company has provided the FDA with certain clinical and radiographic data from
the U.S. clinical trial and European studies and has requested a pre-filing
meeting with FDA representatives to elicit the FDA's view as to whether a 510(k)
clearance pathway is a viable alternative to a PMA application for the ROBODOC
System and to provide additional data to the FDA, including information in
support of the Company's belief that implant fit and alignment are significant
clinical endpoints. Although the FDA previously indicated to the Company that
the ROBODOC System was more likely to require PMA approval rather than 510(k)
clearance, the Company believes that the recent 510(k) clearance of a potential
predicate device may offer a new basis for seeking 510(k) clearance for the
ROBODOC System based, in part, upon a claim that the ROBODOC System is
substantially equivalent to this predicate device. There can be no assurance
that the FDA will agree to a pre-filing meeting with the Company or will provide
the Company with feedback as to whether a 510(k) submission is a possible
alternative to a PMA application for the ROBODOC System or will agree with the
Company's assessment of the appropriate endpoints.
 
     Unless the FDA rules out the 510(k) clearance path, the Company currently
intends to submit a 510(k) notification to the FDA sometime during the first
quarter of 1998. On the other hand, if the FDA indicates that a PMA application
will be required, the filing of a PMA application by the Company could be
delayed until the latter part of 1998 or later. These submission time frames
could be substantially extended if the FDA indicates that the existing clinical
data is insufficient to support clearance or approval or that additional
clinical data will be necessary in order to submit a 510(k) notification or PMA
application for the ROBODOC System. The Company's submission of a PMA
application also could be delayed if the Company invests substantial time
pursuing 510(k) clearance but is ultimately unsuccessful. There can be no
assurance that the FDA will grant 510(k) clearance or PMA approval to the
ROBODOC System on a timely basis, or at all, or that such clearance or approval
will not include unfavorable limitations or restrictions. See "Risk Factors --
Available Clinical Data; Risk Versus Benefit Issues."
 
     New surgical applications for the ROBODOC System generally will require FDA
clearance or approval of a new 510(k) submission or a PMA supplement or,
possibly, a new PMA application. The Company is also likely to require
additional FDA approvals, supported by additional clinical data, before
incorporating new imaging modalities such as ultrasound and MRI or other
different technologies in the ROBODOC System.
 
     No Assurance of Approvals; Subsequent Review of Approvals, Etc.  There can
be no assurance that any of the Company's current or future products will obtain
required FDA approvals on a timely basis, or at all, or that the Company will
have the necessary resources to obtain such approvals. If any of the Company's
products are not approved for use in the United States, the Company will be
limited to marketing them in foreign countries. Furthermore, approvals that have
been or may be granted are subject to continual review, and later discovery of
previously unknown problems can result in product labeling restrictions or
withdrawal of the product from the market.
 
     Adverse Effect of Delays or Loss of Approvals.  Delays in the receipt of,
or failure to receive, FDA approvals or clearances, or the loss of any
previously received approvals or clearances, or limitations on intended use
imposed as a condition of such approvals or clearances, would have a material
adverse effect on the business, financial condition and results of operations of
the Company.
 
                                       13
<PAGE>   14
 
     Requirement to Follow Good Manufacturing Practices.  Assuming the Company
obtains the necessary FDA approvals and clearances for its products, in order to
maintain such approvals and clearances the Company will be required, among other
things, to register its establishment and list its devices with the FDA and with
certain state agencies, maintain extensive records, report any adverse
experiences on the use of its products and submit to periodic inspections by the
FDA and certain state agencies. The FDC Act also requires devices to be
manufactured in accordance with the Quality System Regulation ("QSR"), which
sets forth good manufacturing practices ("GMP") requirements with respect to
manufacturing and quality assurance activities. The QSR revises the previous GMP
regulation and imposes certain enhanced requirements that are likely to increase
the cost of compliance, including design controls.
 
     Modifications to Cleared Devices.  The Company has made what it believes
are nonsignificant modifications to the ORTHODOC and the NeuroMate System which
the Company believes do not require the submission of new 510(k) notices. There
can be no assurance, however, that the FDA would agree with any of the Company's
determinations not to submit a new 510(k) notice for any of these changes or
would not require the Company to submit a new 510(k) notice for any of the
changes made to the device. If the FDA requires the Company to submit a new
510(k) notice for any device modification, the Company may be prohibited from
marketing the modified device until the 510(k) notice is cleared by the FDA.
 
  FOREIGN REGULATION.  The introduction of the Company's products in foreign
markets has subjected and will continue to subject the Company to foreign
regulatory clearances, which may be unpredictable and uncertain, and which may
impose substantial additional costs and burdens. The ROBODOC and NeuroMate
Systems satisfy the appropriate international electromedical safety standards
and comply with the requirements of the Electromagnetic Compatibility Directive,
thus allowing the Company to apply the CE Mark under the European Directives and
to distribute the ROBODOC and NeuroMate Systems throughout the European Union.
Outside the European Union, international sales of medical devices are subject
to the regulatory requirements of each country. The regulatory review process
varies from country to country. Many countries also impose product standards,
packaging requirements, labeling requirements and import restrictions on
devices. No assurance can be given that any additional necessary approvals or
clearances for the Company's products will be granted on a timely basis, or at
all.
 
  UNCERTAINTY REGARDING PATENTS AND PROTECTION OF PROPRIETARY TECHNOLOGY.
 
     Summary.  Certain technology underlying the Company's products is the
subject of one United States patent issued to IBM, which IBM has agreed not to
enforce against the manufacture and sale of the Company's products, and five
patent applications by the Company, the outcome of which applications is
uncertain. Third party claims to the technology used in the Company's products
could, if valid, require the Company to obtain licenses to the technology; those
licenses may not be available on acceptable terms. The technology used in the
Company's products could be (a) disclosed by Company employees despite their
confidentiality obligations to the Company or (b) independently developed or
otherwise acquired by potential competitors.
 
     General.  The Company's ability to compete successfully may depend, in
part, on its ability to obtain and protect patents, protect trade secrets and
operate without infringing the proprietary rights of others. The Company's
policy is to seek to protect its proprietary position by, among other methods,
filing U.S. and foreign patent applications relating to its technology,
inventions and improvements that are important to the development of its
business. The Company has filed five patent applications, and is preparing for
filing additional patent applications covering various aspects of its
technology. In addition, IBM has agreed not to assert infringement claims
against the Company with respect to an IBM patent relating to robotic medical
\technology, to the extent such technology is used in the Company's products.
Significant portions of the ROBODOC System and ORTHODOC software are protected
by copyrights. IBM has granted the Company a royalty-free license for the
underlying software code for the ROBODOC System.
 
     There can be no assurance that the Company's pending or future patent
applications will mature into issued patents, or that the Company will continue
to develop its own patentable technologies. Further, there can be no assurance
that any patents that may be issued in the future will effectively protect the
Company's
 
                                       14
<PAGE>   15
 
technology or provide a competitive advantage for the Company's products or will
not be challenged, invalidated, or circumvented in the future. In addition,
there can be no assurance that competitors, many of which have substantially
more resources than the Company and have made substantial investments in
competing technologies, will not obtain patents that will prevent, limit or
interfere with the Company's ability to make, use or sell its products either in
the United States or internationally.
 
     Secrecy of Patent Applications Until Patents Issued.  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. Publication of discoveries in the scientific or patent literature tends
to lag behind actual discoveries and the filing of related patent applications.
Patents issued and patent applications filed relating to medical devices are
numerous and there can be no assurance that current and potential competitors
and other third parties have not filed or in the future will not file
applications for, or have not received or in the future will not receive,
patents or obtain additional proprietary rights relating to products or
processes used or proposed to be used by the Company.
 
     Lack of Infringement Study.  The Company's patent counsel has not
undertaken any infringement study to determine if the Company's products and
pending patent applications infringe on other existing patents due to the
Company's belief that an infringement study would not be cost-effective, nor
offer sufficient protection against potential infringement claims, if and when
made. The medical device industry has been characterized by substantial
competition and litigation regarding patent and other proprietary rights. The
Company intends to vigorously protect and defend its patents and other
proprietary rights relating to its proprietary technology. Litigation alleging
infringement claims against the Company (with or without merit), or instituted
by the Company to enforce patents and to protect trade secrets or know-how owned
by the Company or to determine the enforceability, scope and validity of the
proprietary rights of others, is costly and time consuming. If any relevant
claims of third-party patents are upheld as valid and enforceable in any
litigation or administrative proceedings, the Company could be prevented from
practicing the subject matter claimed in such patents, or could be required to
obtain licenses from the patent owners of each patent, or to redesign its
products or processes to avoid infringement. There can be no assurance that such
licenses would be available or, if available, would be available on terms
acceptable to the Company or that the Company would be successful in any attempt
to redesign its products or processes to avoid infringement. Accordingly, an
adverse determination in a judicial or administrative proceeding or failure to
obtain necessary licenses could prevent the Company from manufacturing and
selling its products, which would have a material adverse effect on the
Company's business, financial condition and results of operations.
 
     Possibility of Disclosure or Discovery of Proprietary
Information.  Although the Company requires each of its employees, consultants,
and advisors to execute confidentiality and assignment of inventions and
proprietary information agreements in connection with their employment,
consulting or advisory relationships with the Company, there can be no assurance
that these agreements will provide effective protection for the Company's
proprietary information in the event of unauthorized use or disclosure of such
information. Furthermore, no assurance can be given that competitors will not
independently develop substantially equivalent proprietary information and
techniques or otherwise gain access to the Company's proprietary technology, or
that the Company can meaningfully protect its rights in unpatented proprietary
technology.
 
     LIMITED PRODUCTION EXPERIENCE.  The Company's success will depend in part
on its ability to assemble its products in a timely, cost-effective manner and
in compliance with GMP, and manufacturing requirements of other countries,
including the International Standards Organization ("ISO") 9000 standards and
other regulatory requirements. The assembly of the Company's products is a
complex operation involving a number of separate processes and components. The
Company's production activities to date have consisted primarily of assembling
limited quantities of systems for use in clinical trials and a limited number of
systems for commercial sale. The Company does not have experience in assembling
its products in the commercial quantities that might be required. Furthermore,
as a condition to receipt of PMA approval, the Company's facilities, procedures
and practices will be subject to pre-approval and ongoing GMP inspections by
FDA.
 
     Manufacturers often encounter difficulties in scaling up manufacturing of
new products, including problems involving product yields, quality control and
assurance, component and service availability, adequacy of control policies and
procedures, lack of qualified personnel, compliance with FDA regulations, and
the need
 
                                       15
<PAGE>   16
 
for further FDA approval of new manufacturing processes and facilities. There
can be no assurance that production yields, costs or quality will not be
adversely affected as the Company seeks to increase production, and any such
adverse effect could have a material adverse effect on the Company's business,
financial condition and results of operations.
 
     DEPENDENCE ON SUPPLIER FOR ROBOT.  Although the Company has multiple
sources for most of the components, parts and assemblies used in the ROBODOC and
NeuroMate Systems, the Company is dependent on Sankyo Seiki of Japan for the
ROBODOC System robot and Audemars-Piguet of Switzerland for the supply of the
customized NeuroMate robot. The robot for either the ROBODOC System or the
NeuroMate System can be obtained from other suppliers with appropriate
modifications and engineering effort. If the Company were no longer able to
obtain the robot from its supplier, there can be no assurance that the delays
resulting from the required modifications or engineering effort to adapt
alternative components would not have a material adverse effect on the Company's
business, financial condition and results of operations.
 
     RELIANCE ON FOREIGN SALES.  From inception through September 30, 1997,
substantially all of the Company's sales (other than clinical sales in the
United States pursuant to an exemption in the rules and regulations of the FDA
for investigational devices) have been to customers in Germany, Austria, France
and Japan. The Company believes that until such time, if ever, as it receives
approval from the FDA to market the ROBODOC System in the United States,
substantially all of its sales for the ROBODOC System will be derived from
customers in foreign markets. Foreign sales are subject to certain risks,
including economic or political instability, shipping delays, fluctuations in
foreign currency exchange rates, changes in regulatory requirements, custom
duties and export quotas and other trade restrictions, any of which could have a
material adverse effect on the Company's business. To date, payment for
substantially all ROBODOC Systems in Europe has been fixed in U.S. Dollars.
However, there can be no assurance that in the future the customers will be
willing to make payment to the Company for its products in U.S. Dollars. If the
U.S. Dollar strengthens substantially against the foreign currency of a country
in which the Company sells its products, the cost of purchasing the Company's
products in U.S. Dollars would increase and may inhibit purchases of the
Company's products by customers in that country. The Company is unable to
predict the nature of future changes in foreign markets or the effect, if any,
they might have on the Company.
 
     UNCERTAINTY CONCERNING THIRD PARTY REIMBURSEMENT.  The Company expects that
its ability to successfully commercialize its products will depend significantly
on the availability of reimbursement for surgical procedures using the Company's
products from third-party payors such as governmental programs, private
insurance and private health plans. Reimbursement is a significant factor
considered by hospitals in determining whether to acquire new equipment.
Notwithstanding FDA approval, if granted, third-party payors may deny
reimbursement if the payor determines that a therapeutic medical device is
unnecessary, inappropriate, not cost-effective or experimental or is used for a
nonapproved indication. Although the Company is not aware of any potential
customer that has declined to purchase the ROBODOC System based upon third party
reimbursement policies, cost control measures adopted by third-party payors may
have a significant effect on surgeries performed with the ROBODOC System or as
to the levels of reimbursement. There also can be no assurance that levels of
reimbursement, if any, will not be decreased in the future, or that future
legislation, regulation, or reimbursement policies of third-party payors will
not otherwise adversely affect the demand for the Company's products or its
ability to sell its products on a profitable basis. Fundamental reforms in the
healthcare industry in the United States and Europe that could affect the
availability of third-party reimbursement continue to be proposed, and the
Company cannot predict the timing or effect of any such proposal. If third-party
payor coverage or reimbursement is unavailable or inadequate, the Company's
business, financial condition and results of operation could be materially and
adversely affected.
 
     DEPENDENCE ON KEY PERSONNEL.  The Company's business and marketing plan was
formulated by, and is to be implemented under the direction of, Dr. Ramesh C.
Trivedi, the Chief Executive Officer and President of the Company. Dr. Trivedi
is employed by the Company pursuant to an employment agreement terminable by the
Company or Dr. Trivedi at any time. The Company has obtained key-man insurance
on the life of Dr. Trivedi in the amount of $1,000,000. The Company's growth and
future success also will depend in large part on the continued contributions of
its key technical and senior management personnel, as well as its ability
 
                                       16
<PAGE>   17
 
to attract, motivate and retain highly qualified personnel generally and, in
particular, trained and experienced professionals capable of developing, selling
and installing the Systems and training surgeons in their use. Competition for
such personnel is intense, and there can be no assurance that the Company will
be successful in hiring, motivating or retaining such qualified personnel. None
of the Company's executive or key technical personnel, other than Dr. Trivedi,
is employed by the Company pursuant to an employment agreement with the Company.
The loss of the services of Dr. Trivedi or other senior management or key
technical personnel, or the inability to hire or retain qualified personnel,
could have a material adverse effect on the Company's business, financial
condition and results of operations.
 
     CONTROL OF THE COMPANY; OWNERSHIP OF SHARES BY CURRENT MANAGEMENT AND
PRINCIPAL SECURITYHOLDERS. The executive officers, directors and other
significant securityholders of the Company own or have rights to acquire
4,350,704 shares of Common Stock (or approximately 39% of the shares of Common
Stock on a fully diluted basis). Although these securityholders may or may not
agree on any particular matter that is the subject of a vote of the
stockholders, these securityholders may be effectively able to control the
outcome of any issues which may be subject to a vote of securityholders,
including the election of directors, proposals to increase the authorized
capital stock, or the approval of mergers, acquisitions, or the sale of all or
substantially all of the Company's assets.
 
     NEED FOR ADDITIONAL FINANCING.  Although the Company anticipates that the
net proceeds of the European Offering, together with cash flow from operations,
will be sufficient to finance its operations through 1999, there can be no
assurance that the Company will not require additional financing at an earlier
date. This will depend upon the Company's ability to generate sufficient sales
of its products, and the timing of required expenditures. If the Company is
required to obtain financing in the future, there can be no assurance that such
financing will be available on terms acceptable to the Company, if at all.
 
     PRODUCT LIABILITY.  The manufacture and sale of medical products exposes
the Company to the risk of significant damages from product liability claims.
The Company maintains product liability insurance against product liability
claims in the amount of $5 million per occurrence and $5 million in aggregate.
In addition, in connection with the sale of ROBODOC Systems, the Company enters
into indemnification agreements with its customers pursuant to which the
customers indemnify the Company against any claims against it arising from
improper use of the ROBODOC System. There can be no assurance, however, that the
coverage limits of the Company's insurance coverage, that such insurance can be
maintained at acceptable costs, or that customers will be able to satisfy
indemnification claims. Although the Company has not experienced any product
liability claims to date, a successful claim brought against the Company in
excess of its insurance coverage could have a materially adverse effect on the
Company's business, financial condition, and results of operations.
 
     LIMITATION ON DIRECTOR LIABILITY.  The Company's certificate of
incorporation provides that a director of the Company shall not be personally
liable to the Company or its stockholders for monetary damages for breach of
fiduciary duty as a director, with certain exceptions under Delaware law. This
may discourage stockholders from bringing suit against a director for breach of
fiduciary duty and may reduce the likelihood of derivative litigation brought by
stockholders on behalf of the Company against a director. In addition, the
Company's By-laws provide for mandatory indemnification of directors and
officers.
 
     ABSENCE OF DIVIDENDS.  Since inception, the Company has not paid any
dividends on its Common Stock and it does not anticipate paying such dividends
in the foreseeable future. The Company intends to retain earnings, if any, to
finance its operations.
 
     POSSIBLE VOLATILITY OF MARKET PRICE FOR THE COMMON STOCK.  Since the
completion of the Company's initial public offering in November 1996, the market
price of the Common Stock has fluctuated significantly. The Company believes
that factors such as announcement of developments related to the Company's
business, announcements of technological innovations or new products by the
Company or its competitors, sales of the Company's Common Stock in the public
market, and shortfalls or changes in the Company's financial results from
analysts' expectations could cause the price of the Common Stock to fluctuate
substantially. The Company's operating results and various factors affecting the
medical device industry generally also may significantly impact the market price
of the Company's securities. In addition, the stock market generally, and
 
                                       17
<PAGE>   18
 
the securities of technology companies in particular, have experienced a high
level of price and volume volatility, and market prices for the securities of
many companies have experienced wide price fluctuations not necessarily related
to the operating performance of such companies. There can be no assurance that
the market price of the Common Stock will not experience significant
fluctuations or decline below the public offering price.
 
     SHARES ELIGIBLE FOR FUTURE SALE.  No assurance can be given as to the
effect, if any, that future sales of Common Stock, or the availability of shares
of Common Stock for future sales, will have on the market price of the Common
Stock from time to time. Sales of substantial amounts of Common Stock (including
shares issued upon the exercise of warrants or stock options), or the
possibility of such sales, could adversely affect the market price of the Common
Stock and also impair the Company's ability to raise capital through an offering
of its equity securities in the future. The Company has 5,503,390 shares of
Common Stock outstanding, of which only 3,660,570 shares of Common Stock are
transferable without restriction under the Securities Act of 1933 (the
"Securities Act"). The remaining 1,842,820 shares, issued in private
transactions, are "restricted securities" (as that term is defined in Rule 144
promulgated under the Securities Act) which may be publicly sold only if
registered under the Securities Act or if sold in accordance with an applicable
exemption from registration, such as Rule 144. In general, under Rule 144 as
currently in effect, subject to the satisfaction of certain other conditions, a
person, including an affiliate of the Company, who has beneficially owned
restricted securities for at least one year, is entitled to sell (together with
any person with whom such individual is required to aggregate sales), within any
three-month period, a number of shares that does not exceed the greater of 1% of
the total number of outstanding shares of the same class or, if the Common Stock
is quoted on Nasdaq or a national securities exchange, the average weekly
trading volume during the four calendar weeks preceding the sale. A person who
has not been an affiliate of the Company for at least three months and who has
beneficially owned restricted securities for at least two years is entitled to
sell such restricted securities under Rule 144 without regard to any of the
limitations described above. Officers, directors and the other existing
securityholders of the Company, owning or having rights to acquire in the
aggregate 5,129,759 shares of Common Stock constituting restricted securities,
have agreed not to sell or otherwise dispose of any shares of Common Stock prior
to May 21, 1998 ("Lock-Up Agreements"), without the prior written consent of
Rickel & Associates, Inc. ("Rickel"), managing underwriter of the Company's
initial public offering. Rickel has agreed with the Company and CA IB that it
will not consent to the sale of such shares prior to that date. Following
expiration of the term of the Lock-Up Agreements, 1,828,778 shares of Common
Stock will become eligible for resale pursuant to Rule 144 commencing in the
second quarter of 1998, subject to the volume limitations and compliance with
the other provisions of Rule 144. In addition, securityholders of the Company
owning or having rights to acquire in the aggregate 4,030,649 shares of Common
Stock granted certain registration rights with respect to those shares have
agreed that they will not exercise such registration rights prior to May 21,
1998. The Company granted holders of the underwriters' warrants issued in
connection with the Company's initial public offering demand and piggyback
registration rights with respect to the shares of Common Stock and warrants
issuable upon exercise of those underwriters' warrants and Rickel piggyback
registration rights (fully subordinated to the registration rights of the other
holders of the Company's securities) with respect to 25,000 shares of Common
Stock purchasable upon exercise of certain other warrants. In addition, the
Company has granted the holders of warrants to purchase 150,000 shares of Common
Stock issued to CA IB and Value Management & Research GmbH ("VMR") in connection
with the European Offering demand and piggyback registration rights with respect
to the shares of Common Stock issuable upon exercise thereof.
 
     EFFECT OF ISSUANCE OF COMMON STOCK UPON EXERCISE OF WARRANTS AND OPTIONS;
POSSIBLE ISSUANCE OF ADDITIONAL OPTIONS.  The Company has an aggregate of
4,228,069 shares of Common Stock authorized but unissued and not reserved for
specific purposes and an additional 5,268,541 shares of Common Stock unissued
but reserved for issuance upon exercise of (i) options granted pursuant the
Company's stock option plans, and (ii) outstanding warrants. All of such shares
may be issued without any action or approval by the Company's stockholders.
Although except for issuances upon exercise of outstanding options or warrants
there are no present plans, agreements, commitments or undertakings with respect
to the issuance of additional shares of Common Stock or securities convertible
into any such shares by the Company, any shares issued would further dilute the
percentage ownership of the Company held by the public stockholders. The Company
has
 
                                       18
<PAGE>   19
 
agreed with Rickel that it will not issue any securities or rights thereto,
other than shares of Common Stock issuable upon exercise of the warrants issued
in the Company's initial public offering (the "Public Warrants") and options
granted pursuant to the Company's stock option plans, without the consent of
Rickel until November 21, 1999. Rickel, which ceased operations as a registered
broker dealer on September 19, 1997, consented to the issuance of the Shares in
connection with the Company's acquisition of IMMI and the securities issued in
the European Offering. The Company also has agreed with CA IB that, except for
shares of Common Stock issuable upon exercise of the Public Warrants and
outstanding options granted pursuant to the Company's existing stock option
plans, until May 20, 1998, it will not issue or sell, offer or contract to issue
or sell, grant any option for issuance or sale of, or otherwise dispose of,
directly or indirectly, any shares of Common Stock or any securities convertible
into, exchangeable for, or representing the right to receive Common Stock
without, in each case, the prior written consent of CA IB, which consent will
not be unreasonably withheld.
 
     The exercise of warrants or options and the sale of the underlying shares
of Common Stock (or even the potential of such exercise or sale) may have a
depressive effect on the market price of the Company's securities. Moreover, the
terms upon which the Company will be able to obtain additional equity capital
may be adversely affected since the holders of outstanding warrants and options
can be expected to exercise them, to the extent they are able, at a time when
the Company would, in all likelihood, be able to obtain any needed capital on
terms more favorable to the Company than those provided in the warrants and
options.
 
     POSSIBLE ADVERSE EFFECT OF ISSUANCE OF PREFERRED STOCK.  The Company's
certificate of incorporation authorizes the issuance of 1,000,000 shares of
"blank check" preferred stock, with designations, rights and preferences
determined from time to time by the Company's Board of Directors. Accordingly,
the Company's Board of Directors is empowered, without further stockholder
approval, to issue preferred stock with dividend, liquidation, conversion,
voting or other rights that could adversely affect the voting power or other
rights of the holders of the Common Stock. In the event of issuance, the
preferred stock could be used, under certain circumstances, as a method of
discouraging, delaying or preventing a change in control of the Company, since
the terms of the preferred stock that might be issued could effectively restrict
the Company's ability to consummate a merger, reorganization, sale of all or
substantially all of its assets, liquidation or other extraordinary corporate
transaction without the approval of the holders of the preferred stock. The
Company has agreed with CA IB that, except for shares of Common Stock issuable
upon exercise of the Public Warrants and outstanding options granted pursuant to
the Company's existing stock option plans, until May 20, 1998, it will not issue
or sell, offer or contract to issue or sell, grant any option for issuance or
sale of, or otherwise dispose of, directly or indirectly, any shares of Common
Stock or any securities convertible into, exchangeable for, or representing the
right to receive Common Stock without, in each case, the prior written consent
of CA IB, which shall not be unreasonably withheld. However, there can be no
assurance that preferred stock will not be issued at some time in the future.
The Company has agreed with Rickel that it will not issue any securities or
rights thereto, other than shares of Common Stock issuable upon exercise of the
Public Warrants and options granted pursuant to the Company's stock option
plans, without the consent of Rickel until November 21, 1998. Rickel consented
to the issuance of the Shares in connection with the Company's acquisition of
IMMI and the securities issued in the European Offering.
 
     In addition, the Company's Restated Certificate of Incorporation, as
amended, authorizes the issuance of up to 5,750,000 shares of Series D Preferred
Stock. On October 29, 1997, the Company delivered to CA IB an agreement not to
issue any shares of the Series D Preferred Stock, or any options, warrants or
other rights to subscribe for or purchase Series D Preferred Stock or any other
securities convertible into, exercisable or exchangeable for, shares of the
Series D Preferred Stock without the consent of CA IB. In addition, the
Company's management has undertaken to cause the Board of Directors to present a
resolution at the next annual meeting of the Company's stockholders to amend the
Company's Restated Certificate of Incorporation to eliminate the Series D
Preferred Stock. However, there can be no assurance that such resolution will be
presented by the Company's Board of Directors, or, if presented, adopted by the
Company's stockholders.
 
     ANTITAKEOVER PROVISIONS OF DELAWARE BUSINESS COMBINATION STATUTE.  The
Company is subject to Section 203 of the Delaware General Corporation Law
("DGCL"), which limits transactions between a publicly held company and
"interested stockholders" (generally, those stockholders who, together with
their
 
                                       19
<PAGE>   20
 
affiliates and associates, own 15% or more of a company's outstanding capital
stock). This provision of the DGCL also may have the effect of deterring certain
potential acquisitions of the Company.
 
     RISKS ASSOCIATED WITH FORWARD-LOOKING STATEMENTS INCLUDED IN THIS
PROSPECTUS.  This Prospectus and the documents incorporated herein by reference
contain certain forward-looking statements based on current expectations that
involve numerous risks and uncertainties. Assumptions relating to the foregoing
involve judgments with respect to, among other things, future economic,
competitive and market conditions and future business decisions, all of which
are difficult or impossible to predict accurately and many of which are beyond
the control of the Company. Although the Company believes that its assumptions
underlying the forward-looking statements are reasonable, any of the assumptions
could prove inaccurate and, therefore, there can be no assurance that the
forward-looking statements included in this Prospectus and the documents
incorporated herein by reference will prove to be accurate. In light of the
significant uncertainties inherent in the forward-looking statements included
herein and therein, the inclusion of such information should not be regarded as
a representation by the Company or any other person that the objectives and
plans of the Company will be achieved.
 
                                       20
<PAGE>   21
 
                              SELLING STOCKHOLDERS
 
     The table below sets forth, with respect to each Selling Stockholder, based
upon information available to the Company as of January 1, 1998, the number of
shares of Common Stock beneficially owned, the percentage ownership of Common
Stock beneficially owned before the Offering, the number of shares of Common
Stock to be sold, and the number of outstanding shares of Common Stock
beneficially owned after the sale of the shares of Common Stock offered hereby.
None of the Selling Stockholders has been an officer, director or affiliate of
the Company during the preceding three years. Each of the Selling Stockholders
acquired the shares of Common Stock offered hereby in exchange for securities of
IMMI in connection with the acquisition of IMMI by the Company on September 5,
1997. Although there can be no assurance that the Selling Stockholders will sell
any or all of the shares of Common Stock offered hereby, the following table
assumes that each of the Selling Stockholders will sell all of such shares of
Common Stock.
 
<TABLE>
<CAPTION>
                                                    PERCENTAGE OF
                               AMOUNT AND            COMMON STOCK                             SHARES OF COMMON
                            NATURE BENEFICIAL     BENEFICIALLY OWNED     SHARES OF COMMON       STOCK OWNED
           NAME               OWNERSHIP(1)        BEFORE OFFERING(2)     STOCK TO BE SOLD      AFTER OFFERING
- --------------------------  -----------------     ------------------     ----------------     ----------------
<S>                         <C>                   <C>                    <C>                  <C>
Farideh Danel.............        80,643                 1.47%                 80,643                0
Francois Danel............        63,155                 1.15%                 63,155                0
Gerard Hascoet............       194,028                 3.53%                194,028                0
Jerome Lebon..............        33,917                    *                  33,917                0
Jean-Luc Boulnois.........        28,717                    *                  28,717                0
Fernand Badano............         5,431                    *                   5,431                0
Pierre Wuergler...........        27,003                    *                  27,003                0
Georges-Henri Meylan......        11,845                    *                  11,845                0
Enzo Filipini.............        10,478                    *                  10,478                0
Pierre Angelo Botinelli...        10,478                    *                  10,478                0
Giulio Merlani............        10,478                    *                  10,478                0
Serge Tschopp.............        10,478                    *                  10,478                0
Raymond Bornand...........        10,478                    *                  10,478                0
Jacques-Louis Audemars....         6,279                    *                   6,279                0
Mohamed Diab..............         2,619                    *                   2,619                0
Gemed SA..................       113,328                 2.06%                113,328                0
</TABLE>
 
- ---------------
  * Less than 1%
 
(1) Unless otherwise indicated, each person has sole investment and voting power
    with respect to the shares indicated, subject to community property laws,
    where applicable. For purposes of computing the percentage of outstanding
    shares held by each Selling Stockholder on January 1, 1998, any security
    which such person has the right to acquire within 60 days after such date,
    is deemed to be outstanding for the purpose of computing the percentage
    ownership for such person, but is not deemed to be outstanding for the
    purpose of computing the percentage ownership of any other person.
 
(2) Based upon 5,503,390 shares of Common Stock issued and outstanding.
 
                                       21
<PAGE>   22
 
                              PLAN OF DISTRIBUTION
 
     The Selling Stockholders may sell the Shares from time to time directly to
purchasers, or through broker-dealers who may receive compensation in the form
of commissions or discounts from the Selling Stockholders or purchasers. Sales
of the Shares may be effected by broker-dealers in ordinary brokerage
transactions or block transactions on The Nasdaq SmallCap Market, the Pacific
Exchange or EASDAQ, through sales to one or more dealers who may resell as
principals, in privately negotiated transactions or otherwise, at the market
price prevailing at the time of sale, a price related to such prevailing market
price or at a negotiated price. Usual and customary or specifically negotiated
brokerage fees may be paid by the Selling Stockholders in connection therewith.
To the Company's knowledge, none of the Selling Stockholders has entered into
any underwriting arrangements for the sale of the Shares.
 
     Pursuant to the terms of a Stock Purchase Agreement dated as of September
5, 1997, the Selling Stockholders have agreed not to sell the Shares prior to
March 5, 1999, except as follows: (i) from December 6, 1997 through March 5,
1998, an aggregate of 50,000 shares plus l% of the total number of shares of
Common Stock traded on Nasdaq during the preceding three month period; (ii) from
March 6, 1998 through June 5, 1998, an aggregate of 75,000 shares plus 1% of the
total number of shares of Common Stock traded on Nasdaq during the preceding
three month period; (iii) from June 6, 1998 through September 5, 1998, an
aggregate of 100,000 shares plus 1% of the total number of shares of Common
Stock traded on Nasdaq during the preceding three month period; (iv) from
September 6, 1998 through December 5, 1998, an aggregate of 100,000 shares plus
1% of the total number of shares of Common Stock traded on Nasdaq during the
preceding three month period; and (v) from December 6, 1998 through March 5,
1999, an aggregate of 100,000 shares plus 1% of the total number of shares of
Common Stock traded on Nasdaq during the preceding three month period.
Thereafter, the number of shares of Common Stock which may be sold during any
three month period may not exceed the greater of 1% of the total number of
outstanding shares of Common Stock or, if the Common Stock is quoted on Nasdaq
or a national securities exchange, the average weekly trading volume during the
four calendar weeks preceding the sale.
 
     The Selling Stockholders may be deemed to be "underwriters" within the
meaning of the Securities Act and any profits realized by them may be deemed to
be underwriting commissions. Any broker-dealers that participate in the
distribution of the Shares also may be deemed to be "underwriters", as defined
in the Securities Act, and any commissions or discounts paid to them, or any
profits realized by them upon the resale of any Shares purchased by them as
principals, may be deemed to be underwriting commissions or discounts under the
Securities Act. The sale of the Shares by the Selling Stockholders is subject to
the prospectus delivery and other requirements of the Securities Act.
 
     The Shares have been registered pursuant to registration rights granted to
the Selling Stockholders. All costs, expenses and fees in connection with the
registration of the Shares will be borne by the Company. The Selling
Stockholders are responsible for the payment of brokerage commissions and
discounts incurred in connection with the sale of the Shares. The Company has
agreed to indemnify the Selling Stockholders against certain liabilities,
including liabilities under the Securities Act.
 
     Under the Exchange Act and the regulations thereunder, any person engaged
in a distribution of the Common Stock offered by this Prospectus may not
simultaneously engage in market-marking activities with respect to the Common
Stock during the applicable "cooling off" period prescribed by Rule 101 of
Regulation M prior to the commencement of such distribution. In addition, and
without limiting the foregoing, the Selling Stockholders will be subject to
applicable provisions of the Exchange Act and the rules and regulations
thereunder including, without limitation, Rule 102 of Regulation M, which
provisions may limit the timing of purchases and sales of Common Stock by the
Selling Stockholders.
 
     To the extent required, the Company will use its best efforts to file,
during any period in which offers or sales of Shares are being made by or on
behalf of the Selling Stockholders, one or more amendments or supplements to
this Prospectus which describe any material information with respect to the plan
of distribution not previously disclosed herein including the name or names of
any underwriters, broker-dealers or agents, if any, the purchase price paid by
any underwriter for Shares purchased from a Selling Stockholder, and any
discounts, commissions or concessions allowed or reallowed or paid to
broker-dealers.
 
                                       22
<PAGE>   23
 
                                 LEGAL MATTERS
 
     The validity of the Shares will be passed upon for the Company by Snow
Becker Krauss P.C., 605 Third Avenue, New York, New York 10158-0125.
 
                                    EXPERTS
 
     The consolidated financial statements of Integrated Surgical Systems, Inc.
at December 31, 1996 and for each of the two years in the period ended December
31, 1996, appearing in the Company's Annual Report (Form 10-KSB) for the year
ended December 31, 1996 and included in the Registration Statement (Form SB-2
No. 333-31481) and related Prospectus of Integrated Surgical Systems, Inc. dated
November 14, 1997 have been audited by Ernst & Young LLP, independent auditors,
as set forth in their reports thereon included therein and incorporated herein
by reference. Such consolidated financial statements are incorporated herein by
reference in reliance upon such reports given upon the authority of such firm as
experts in accounting and auditing.
 
     The consolidated financial statements of Innovative Medical Machines
International, S.A. at December 31, 1996 and for each of the two years in the
period ended December 31, 1996, appearing in the Current Report (Form 8-K) dated
September 5, 1997 as amended, of Integrated Surgical Systems, Inc., and included
in the Registration Statement (Form SB-2 No. 333-31481) and the related
Prospectus of Integrated Surgical Systems, Inc. dated November 14, 1997 have
been audited by Ernst & Young Entrepreneurs Department D'Ernst & Young Audit,
independent auditors, as set forth in their reports thereon included therein and
incorporated herein by reference. Such consolidated financial statements are
incorporated herein by reference in reliance upon such reports given upon the
authority of such firm as experts in accounting and auditing.
 
                                       23


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