EXOGEN INC
SC 13G/A, 1999-02-16
ELECTROMEDICAL & ELECTROTHERAPEUTIC APPARATUS
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<PAGE>
 
                      SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C. 20549

                                  ___________

                                  SCHEDULE 13G
                                 (Rule 13d-102)

            INFORMATION STATEMENT PURSUANT TO RULES 13d-1 AND 13d-2
                   UNDER THE SECURITIES EXCHANGE ACT OF 1934
                              (Amendment No. 2)/1/


                                  Exogen, Inc.
                                  ------------
                                (Name of Issuer)

                   Common Stock, $0.0001 Par Value Per Share
                   -----------------------------------------
                         (Title of Class of Securities)

                                   302092101
                             ----------------------
                                 (CUSIP Number)

                                  ___________



_______________
/1/ The remainder of this cover page shall be filled out for a reporting
person's initial filing on this form with respect to the subject class of
securities, and for any subsequent amendment containing information which would
alter disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).

                               Page 1 of 12 Pages
<PAGE>
 
- -----------------------                                 ----------------------
  CUSIP No. 302092101                 13G                 Page 2 of 12 Pages
- -----------------------                                 ----------------------

 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON: Marquette Venture Partners II, L.P.
 1  
      S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON: 36-3820302
                                                                               
                          
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* 
 2                                                              (a) [_]
                                                                (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 

- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 4                                 
      Delaware

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5                                                       
     NUMBER OF            None
 
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6       
                          723,783
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7       
    REPORTING             None
 
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8       
                          723,783
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9                           
      723,783
- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10    
                                                                    [_]
 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
11           
      5.7%                                                                   

- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON* 
12           
      PN

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

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>
 
- -----------------------                                 ----------------------
  CUSIP No. 302092101                 13G                 Page 3 of 12 Pages
- -----------------------                                 ----------------------

 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON: MVP II Affiliates Fund, L.P.
 1  
      S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON: 36-3871877
                                                                               
                          
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* 
 2                                                              (a) [_]
                                                                (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 

- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 4                                 
      Delaware

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5                                                       
     NUMBER OF            None
 
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6       
                          20,680
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7       
    REPORTING             None
 
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8       
                          20,680
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9                           
      20,680
- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10    
                                                                    [_]
 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
11           
      0.2%                                                                   

- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON* 
12           
      PN

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

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>
 
- -----------------------                                 ----------------------
  CUSIP No. 302092101                 13G                 Page 4 of 12 Pages
- -----------------------                                 ----------------------

 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON: Marquette General II, L.P.
 1  
      S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON: 36-3820303
                                                                               
                          
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* 
 2                                                              (a) [_]
                                                                (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 

- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 4                                 
      Delaware

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5                                                       
     NUMBER OF            None
 
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6       
                          744,463
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7       
    REPORTING             None
 
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8       
                          744,463
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9                           
      744,463
- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10    
                                                                    [_]
 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
11           
      5.9%                                                                   

- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON* 
12           
      PN

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

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>
 
- -----------------------                                 ----------------------
  CUSIP No. 302092101                 13G                 Page 5 of 12 Pages
- -----------------------                                 ----------------------

 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON: Redfish Partners, L.P. (formerly known as
                                JED Limited Partnership)
 1  
      S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON: 36-3760173
                          
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* 
 2                                                              (a) [_]
                                                                (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 

- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 4                                 
      Delaware

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5                                                       
     NUMBER OF            None
 
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6       
                          744,463
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7       
    REPORTING             None
 
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8       
                          744,463
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9                           
      744,463
- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10    
                                                                    [_]
 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
11           
      5.9%                                                                   

- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON* 
12           
      PN

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

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>
 
- -----------------------                                 ----------------------
  CUSIP No. 302092101                 13G                 Page 6 of 12 Pages
- -----------------------                                 ----------------------

 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON: Bluefish Partners, L.P. (formerly known as
                                LDR Limited Partnership)
 1  
      S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON: 36-3760176
                          
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* 
 2                                                              (a) [_]
                                                                (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 

- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 4                                 
      Delaware

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5                                                       
     NUMBER OF            None
 
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6       
                          744,463
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7       
    REPORTING             None
 
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8       
                          744,463
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9                           
      744,463
- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10    
                                                                    [_]
 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
11           
      5.9%                                                                   

- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON* 
12           
      PN

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

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>
 
- -----------------------                                 ----------------------
  CUSIP No. 302092101                 13G                 Page 7 of 12 Pages
- -----------------------                                 ----------------------

 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON: James E. Daverman
 1  
      S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON: ###-##-####
                                                                               
                          
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* 
 2                                                              (a) [_]
                                                                (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 

- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 4                                 
      United States of America

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5                                                       
     NUMBER OF            None
 
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6       
                          744,463
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7       
    REPORTING             None
 
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8       
                          744,463
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9                           
      744,463
- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10    
                                                                    [_]
 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
11           
      5.9%                                                                   

- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON* 
12           
      IN

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

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>
 
- -----------------------                                 ----------------------
  CUSIP No. 302092101                 13G                 Page 8 of 12 Pages
- -----------------------                                 ----------------------

 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON: Lloyd D. Ruth
 1  
      S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON: ###-##-####
                                                                               
                          
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* 
 2                                                              (a) [_]
                                                                (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 

- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 4                                 
      United States of America

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5                                                       
     NUMBER OF            34,000
 
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6       
                          744,463
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7       
    REPORTING             34,000
 
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8       
                          744,463
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9                           
      778,463

- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10    
                                                                    [_]
 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
11           
      6.1%                                                                   

- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON* 
12           
      IN

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

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>
 
Item 1(a)   Name of Issuer:
            -------------- 

            Exogen, Inc. ("Exogen")

Item 1(b)   Address of Issuer's Principal Executive Offices:
            ----------------------------------------------- 

            10 Constitution Avenue
            Piscataway, NJ 08855

Item 2(a)   Name of Person Filing:
            --------------------- 

            This Schedule 13G is being jointly filed by each of the following
            persons pursuant to Rule 13d-(1)(f) promulgated by the Securities
            and Exchange Commission pursuant to Section 13 of the Securities
            Exchange Act of 1934, as amended (the "Act"): (i) Marquette Venture
            Partners II, L.P. ("MVP II"), a Delaware limited partnership, by
            virtue of its direct beneficial ownership of 723,783 shares of
            common stock, par value $0.0001 per share (the "Common Stock"), of
            Exogen; (ii) MVP II Affiliates Fund, L.P. ("MVP II Affiliates"), a
            Delaware limited partnership, by virtue of its direct beneficial
            ownership of 20,680 shares of Common Stock; (iii) Marquette General
            II, L.P. ("MG II"), a Delaware limited partnership, as the sole
            general partner of MVP II and MVP II Affiliates; (iv) Redfish
            Partners, L.P. ("Redfish"), a Delaware limited partnership, as a
            general partner of MG II; (v) Bluefish Partners, L.P. ("Bluefish"),
            a Delaware limited partnership, as a general partner of MG II; (vi)
            James E. Daverman ("Mr. Daverman"), as an affiliate of Redfish; and
            (vii) Lloyd D. Ruth ("Mr. Ruth") as an individual and an affiliate
            of Bluefish. MVP II, MVP II Affiliates, MG II, Redfish, Bluefish,
            Mr. Daverman and Mr. Ruth are hereinafter collectively referred to
            as the "Reporting Persons."

            The Reporting Persons have entered into a Joint Filing Agreement,
            dated February 13, 1997, a copy of which has been previously filed
            with this Schedule 13G, pursuant to which the Reporting Persons have
            agreed to file this statement jointly in accordance with the
            provisions of Rule 13d-1(f)(1) under the Act.

Item 2(b)   Address of Principal Business Office or, if none,
            Residence:
            ------------------------------------------------

            The address of the principal business office of each of the
            Reporting Persons is:

            Corporate 500 Centre
            520 Lake Cook Road, Suite 450
            Deerfield, Illinois 60015

                              Page 9 of 12 Pages
<PAGE>
 
Item 2(c)   Citizenship
            -----------

            MVP II, MVP II Affiliates, MG II, Redfish and Bluefish are limited
            partnerships organized under the laws of Delaware.
            Mr. Daverman and Mr. Ruth are United States citizens.

Item 2(d)   Title of Class of Securities:
            ---------------------------- 

            Common Stock, $0.0001 par value per share.

Item 2(e)   CUSIP No.:
            --------- 

            302092101

Item 3      If this statement is filed pursuant to Rules 13d-1(b)
            or 13d-2(b), check whether the persons filing is a:
            ---------------------------------------------------   

            The persons filing are not described in any category listed under
            this item.

Item 4      Ownership
            ---------

            MG II is the sole general partner of both MVP II and MVP II
            Affiliates; Redfish and Bluefish are the general partners of MG II;
            Mr. Daverman is an affiliate of Redfish; and Mr. Ruth is an
            affiliate of Bluefish. As a result of such relationships, MG II,
            Redfish, Bluefish and both Messrs. Daverman and Ruth may be deemed
            to share voting and dispositive power with respect to the shares
            held by MVP II and MVP II Affiliates. The information on the cover
            pages is incorporated herein by reference.

            Each Reporting Person expressly disclaims beneficial ownership of
            any shares of Common Stock beneficially owned by each other
            Reporting Person.

Item 5      Ownership of Five Percent or Less of a Class:
            -------------------------------------------- 

            If this statement is being filed to report the fact that as of the
            date hereof the reporting person has ceased to be the beneficial
            owner of more than five percent of the class of securities, check
            the following [ ].

Item 6      Ownership of More Than Five Percent on Behalf of Another Person:
            --------------------------------------------------------------- 

            No other person has the right to receive or the power to direct the
            receipt of dividends from, or other proceeds from the sale, of the
            shares.

Item 7      Identification and Classification of the Subsidiary Which
            Acquired the Security Being Reported on By the Parent Holding
            Company:
            -------------------------------------------------------------

                              Page 10 of 12 Pages
<PAGE>
 
            Not applicable.

Item 8      Identification and Classification of Members of the Group:
            --------------------------------------------------------- 
            Not applicable.

Item 9      Notice of Dissolution of Group:
            ------------------------------ 

            Not applicable.

Item 10     Certification:
            ------------- 

            Not applicable.

                              Page 11 of 12 Pages
<PAGE>
 
                                   SIGNATURE

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

Date: February 12, 1999

                                      MARQUETTE VENTURE PARTNERS II, L.P.

                                      MVP II AFFILIATES FUND, L.P.

                                      MARQUETTE GENERAL II, L.P.

                                      BLUEFISH PARTNERS, L.P.


                                      By:  /s/ Lloyd D. Ruth
                                          ------------------------------------
                                              Lloyd D. Ruth
                                              as authorized signatory


                                      REDFISH PARTNERS, L.P.


                                      By:  /s/ James E. Daverman
                                          ------------------------------------
                                              James E. Daverman
                                              as authorized signatory



                                       /s/ James E. Daverman
                                      ----------------------------------------
                                      JAMES E. DAVERMAN


                                       /s/ Lloyd D. Ruth
                                      ----------------------------------------
                                      LLOYD D. RUTH

                              Page 12 of 12 Pages


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