<PAGE>   1
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                  FORM 10-Q/A


[X]      QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
         EXCHANGE ACT OF 1934 

         For Quarterly Period Ended September 30, 1997


                                       OR

[ ]      TRANSACTION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
         EXCHANGE ACT OF 1934


                           Commission File No. 0-23165

                                   RENEX CORP.
             (Exact name of Registrant as specified in its charter)


            Florida                                             65-0422087
(State or other jurisdiction of                              (I.R.S. Employer 
 incorporation or organization)                             Identification No.)


                     2100 Ponce de Leon Boulevard, Suite 950
                           Coral Gables, Florida 33134
          (Address of principal executive offices, including Zip Code)
        Registrant's telephone number including area code: (305) 448-2044


Indicate by check mark whether the registrant (1) has filed all reports required
to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during
the preceding 12 months (or for such shorter period that the registrant was
required to file such reports), and (2) has been subject to such filing
requirements for the past 90 days. [ ] Yes [X] No

                      APPLICABLE ONLY TO CORPORATE ISSUERS:


Title of Each Class                             Number of Shares Outstanding
    Common Stock                                    September 30, 1997
                                                        3,974,247


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                          RENEX CORP. AND SUBSIDIARIES
                          CONSOLIDATED BALANCE SHEETS


<TABLE>
<CAPTION>
                                                   September 30,      December 31,
                                                       1997              1996
                                                   -------------      ------------
                                                    (Unaudited)
<S>                                                 <C>               <C>                 

                     ASSETS
Current assets:

     Cash and cash equivalents                   $ 1,154,000         $   952,000
     Accounts receivable (net of allowance for
          doubtful accounts of $1,430,000 and
          $1,261,000 at September 30, 1997
          and December 31, 1996, respectively)     5,141,000           4,535,000
     Inventories                                     359,000             347,000
     Prepaids and other                              361,000             225,000
                                                 -----------         -----------
               Total current assets                7,015,000           6,059,000

     Fixed assets, net                             6,906,000           6,042,000
     Intangible assets, net                        1,127,000           1,309,000
     Notes receivable from affiliates
         (interest rate of 8%)                        85,000              85,000
     Other assets                                  1,764,000           1,666,000
                                                 -----------         -----------
               TOTAL ASSETS                      $16,897,000         $15,161,000
                                                 ===========         ===========

          LIABILITIES AND SHAREHOLDERS' EQUITY

     Current liabilities:
          Accounts payable                      $    974,000         $   708,000
          Accrued expenses and other               2,847,000           2,393,000
          Current portion of long-term debt            6,000              46,000
          Current portion of capital lease 
               obligations                           403,000             523,000
                                                 -----------         -----------
                    Total current liabilities      4,230,000           3,670,000
                                                 -----------         -----------

     Line of credit                                1,000,000
                                                 -----------                    
     Long-term debt, less current portion          6,196,000           6,184,000
                                                 -----------         -----------
     Capital lease obligations, less current
               portion                             1,923,000             990,000
                                                 -----------         -----------
     Shareholders' equity:
          Common stock, $.001 par value, 
             30,000,000 shares authorized, 
             3,974,247 shares as of 
             September 30, 1997 and 3,970,115
             shares as of December 31, 1996, 
             issued and outstanding                    3,000               3,000
          Additional paid-in capital               9,163,000           9,151,000
          Accumulated deficit                     (5,618,000)         (4,837,000)
                                                 -----------         -----------
                    Total shareholders' equity     3,548,000           4,317,000
                                                 -----------         -----------
                    TOTAL LIABILITIES AND 
                      SHAREHOLDERS' EQUITY       $16,897,000         $15,161,000
                                                 ===========         ===========

</TABLE>

          See accompanying notes to consolidated financial statements.
                              
     
               


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                                   SIGNATURES


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


                                       RENEX CORP.
                                       (Registrant)



                                       By: /s/ JAMES P. SHEA
                                           -------------------------------------
                                           James P. Shea
                                           President and Chief Executive Officer



                                       By: /s/ ORESTES L. LUGO
                                           -------------------------------------
                                           Orestes L. Lugo
Date: November 24, 1997                    Vice President--Finance and  
                                           Chief Financial Officer








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