INTEGRATED ORTHOPEDICS INC
10QSB, 1998-11-16
HEALTH SERVICES
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<PAGE>
 
                                                                            10-Q



                      SECURITIES AND EXCHANGE COMMISSION

                            WASHINGTON, D.C. 20549
                       ________________________________


                                  FORM 10-QSB

<TABLE> 
<CAPTION> 
<S>  <C> 
{X}  Quarterly Report Pursuant to Section 13 or 15 (d) of the Securities Exchange Act of 1934

               For the Quarterly Period Ended September 30, 1998

                                      OR

{ }  Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934
</TABLE> 
           For the transition period from __________ to __________.


                         COMMISSION FILE NO.  1-10677
                                              -------


                         INTEGRATED ORTHOPAEDICS, INC.
                         -----------------------------
            (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)

<TABLE> 
<CAPTION> 
        <S>                                   <C> 
                   TEXAS                                   76-0203483
        -------------------------------       --------------------------------------
        (State or other jurisdiction of       (I.R.S. Employer Identification No.)
        incorporation or organization)
</TABLE> 

               5858 Westheimer, Suite 500, Houston, Texas 77057
               ------------------------------------------------
                   (Address of principal executive offices)

                                (713) 225-5464
                ----------------------------------------------
             (Registrant's telephone number, including area code)

Check whether the issuer (1) filed all reports required to be filed by
Section 13 or 15 (d) of the 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
          -----    ----- 

As of November 13, 1998, 6,496,540 shares of Common Stock were outstanding.

Transitional Small Business Disclosure Form:  YES        NO  X
                                                 -----     -----
<PAGE>
 
                         INTEGRATED ORTHOPAEDICS, INC.
                                  FORM 10-QSB

                        FOR THE QUARTERLY PERIOD ENDED
                              SEPTEMBER 30, 1998

                                     INDEX

<TABLE> 
<CAPTION> 
                                                                                   PAGE
                                                                                    NO.
                                                                                   ----

PART I.   FINANCIAL INFORMATION

          Item 1.   Financial Statements
          <S>       <C>                                                             <C> 
                    Condensed Consolidated Balance Sheets--
                    September 30, 1998 and December 31, 1997......................... 1

                    Consolidated Statements of Operations--
                    Three months and Nine months ended September 30, 1998 and 1997... 2

                    Consolidated Statement of Change in
                    Stockholders' Equity--
                    Nine months ended September 30, 1998............................. 3

                    Condensed Consolidated Statements of Cash Flows--
                    Nine months ended September 30, 1998 and 1997.................... 4

                    Notes to Condensed Consolidated Financial Statements............. 5


          Item 2.   Management's Discussion and Analysis of
                    Financial Condition and Results of Operations.................... 9


PART II.  OTHER INFORMATION..........................................................14


SIGNATURE............................................................................15
</TABLE> 
<PAGE>
 
                         INTEGRATED ORTHOPAEDICS, INC.

                     CONDENSED CONSOLIDATED BALANCE SHEETS
                                (IN THOUSANDS)


<TABLE>
<CAPTION>
                                                      SEPTEMBER 30,           DECEMBER 31,
                                                          1998                    1997
                                                      -------------           ------------
                            ASSETS                     (UNAUDITED)
                            ------
 
Current Assets:
<S>                                                        <C>                      <C>
     Cash and cash equivalents                             $   6,900                $ 16,642
     Accounts receivable, net                                  3,398                   2,956
     Other current assets                                      1,997                   1,749
                                                      --------------          --------------
          Total Current Assets                                12,295                  21,347
 
Property and Equipment                                         4,289                   4,344
Less - Accumulated depreciation and amortization              (2,359)                 (2,815)
                                                      --------------          --------------
          Net Property and Equipment                           1,930                   1,529
 
Management Services Agreements, Net                           31,064                  25,018
Other Assets                                                     858                     258
                                                      --------------          --------------
 
          TOTAL ASSETS                                     $  46,147                $ 48,152
                                                      ==============          ==============
 
 
               LIABILITIES AND STOCKHOLDERS' EQUITY
               ------------------------------------
 
Current Liabilities
     Accounts payable                                      $     312                $    565
     Accrued liabilities                                       2,783                   3,155
     Current maturities of notes payable and
          current lease obligations                              112                   1,618
                                                      --------------          --------------
          Total  Current Liabilities                           3,207                   5,338
 
Long-term Debt                                                 1,457                   1,519
 
Deferred Income Taxes                                         10,077                   7,873
                                                      --------------          --------------
          Total Liabilities                                   14,741                  14,730
                                                      --------------          --------------
 
Stockholders' Equity:
     Preferred stock                                               3                       3
     Common stock                                                  7                       6
     Additional paid-in capital                               46,135                  41,803
     Common stock to be issued                                    78                   1,643
     Accumulated deficit                                     (14,567)                (10,033)
     Treasury shares                                            (250)                      -
                                                      --------------          --------------
          Total Stockholders' Equity                          31,406                  33,422
                                                      --------------          --------------
 
          TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY       $  46,147                $ 48,152
                                                      ==============          ==============
</TABLE>
                                                                                
The accompanying notes are an integral part of this statement.

                                       1
<PAGE>
 
                         INTEGRATED ORTHOPAEDICS, INC.

                     CONSOLIDATED STATEMENTS OF OPERATIONS
                                (IN THOUSANDS)
                                  (UNAUDITED)

<TABLE>
<CAPTION>
                                                     THREE MONTHS ENDED             NINE MONTHS ENDED
                                                        SEPTEMBER 30,                  SEPTEMBER 30,
                                                  -------------------------    ------------------------------
                                                      1998           1997          1998              1997
                                                  -----------    ----------    -----------        -----------
<S>                                               <C>              <C>            <C>               <C>
Revenues                                          $ 3,308          $1,386         $ 9,028           $ 3,898
                                                  -------          ------         -------           -------   
Costs and expenses:                                                                                 
  Practice compensation and benefits                1,115             567           3,098             1,815
  Other direct costs                                  973             370           2,873               965
  General and administrative                        1,527           1,145           4,822             3,028
  Depreciation and amortization                       446              46           1,069               176
  Gain from divestitures and                                                                        
   discontinued operations                              -            (150)              -              (628)
                                                  -------          ------         -------           -------   
                                                    4,061           1,978          11,862             5,356
                                                                                                    
Loss From Operations                                 (753)           (592)         (2,834)           (1,458)
                                                                                                    
Interest income                                       105              87             415               268
Interest expense                                     (162)            (19)           (235)              (58)
                                                  -------          ------         -------           -------   
                                                                                                    
Loss Before Income Tax Benefit                       (810)           (524)         (2,654)           (1,248)
                                                                                                    
Income Tax Benefit                                      -             199               -               474
                                                  -------          ------         -------           -------   
                                                                                                    
Net loss                                          $  (810)         $ (325)        $(2,654)          $  (774)
                                                  =======          ======         =======           =======  
Loss applicable to common shares                  $(1,456)         $ (375)        $(4,534)          $  (924)
                                                  =======          ======         =======           =======  
                                                                                                    
Loss per common share:                                                                              
                                                                                                    
   Basic                                          $ (0.22)         $(0.07)        $ (0.70)          $ (0.17)
                                                  =======          ======         =======           =======
                                                                                                    
   Diluted                                        $ (0.22)         $(0.07)        $ (0.70)          $ (0.17)
                                                  =======          ======         =======           =======
                                                                                             
Weighted average common                                                                      
  shares outstanding                                6,506           5,292           6,437             5,288
</TABLE>



        The accompanying notes are an integral part of this statement.

                                       2
<PAGE>
 
                         INTEGRATED ORTHOPAEDICS, INC.

                CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY
                                (IN THOUSANDS)
                                  (UNAUDITED)
<TABLE>
<CAPTION>
                                                                                                             COMMON
                                     SHARES              AMOUNT          ADDITIONAL                          STOCK 
                               ------------------   ------------------    PAID IN     ACCUMULATED TREASURY   TO BE 
                               COMMON   PREFERRED   COMMON   PREFERRED    CAPITAL      DEFICIT     STOCK     ISSUED   TOTAL
                               ------   ---------   ------   ---------    -------      -------     -----     ------   ----- 

<S>                            <C>         <C>      <C>       <C>         <C>         <C>          <C>       <C>      <C>
Balance -
 December 31, 1997              5,886       276     $     6   $     3     $41,803     $(10,033)    $    -    $ 1,643   $33,422

Dividends - Preferred
 Stock - Series A                                                                         (151)                           (151)

Dividends - Preferred
 Stock - Series B                            14                             1,729       (1,729)                              -

Issuance of shares in
 medical practice
 transaction                      157                                         745                                 78       823

Delivery of common stock
 to be issued                     424                     1                 1,642                             (1,643)        -

Exercise of stock options
 and other                         90                                         216                    (250)                 (34) 
Net loss                                                                                (2,654)                         (2,654) 
                                -----       ---     -------   -------     -------     --------     ------    -------   -------

Balance -
 September 30, 1998             6,557       290     $     7   $     3     $46,135     $(14,567)    $ (250)   $    78   $31,406
                                =====       ===     =======   =======     =======     ========     ======    =======   ======= 
</TABLE>



        The accompanying notes are an integral part of this statement.

                                       3
<PAGE>
 
                         INTEGRATED ORTHOPAEDICS, INC.

                CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
                                (IN THOUSANDS)
                                  (UNAUDITED)
<TABLE>
<CAPTION>
                                                                NINE MONTHS ENDED SEPTEMBER 30,
                                                                -------------------------------
                                                                      1998               1997
                                                                    ---------          --------
<S>                                                                <C>                <C>
 
CASH FLOWS FROM OPERATING ACTIVITIES:
  Net loss                                                         $ (2,654)           $   (774)
  Non-cash expenses and changes in                                                              
    operating assets and liabilities                                    700              (1,993)
                                                                   --------            --------
                                                                                                
      Net cash used in operating activities                          (1,954)             (2,767)
                                                                   --------            --------
                                                                                                
CASH FLOWS FROM INVESTING ACTIVITIES:                                                           
  Net payments in medical practice transaction                       (4,661)                  -
  Purchase of property and equipment, net of disposal                  (357)               (288)
  Proceed from sale of marketable securities                                                    
    and other assets                                                    111                (105)
  Issuance of note receivable, net of collection                        (40)                  -
                                                                     ------            --------
    Net cash used in investing activities                            (4,947)               (393)
                                                                     ------            --------
                                                                                                
CASH FLOWS FROM FINANCING ACTIVITIES:                                                           
  Bank borrowings                                                         -               1,113 
  Payments on bank borrowings                                             -              (2,310)
  Payments on note payable and capital lease obligations             (1,806)               (267)
  Deferred financing costs                                           (1,000)                  -
  Repurchase of common stock                                           (250)                  -
  Other                                                                 215                  35
                                                                   --------            --------
                                                                                                
    Net cash used in financing activities                            (2,841)             (1,429)
                                                                   --------            --------
                                                                                                
NET CHANGE IN CASH AND CASH EQUIVALENTS                              (9,742)             (4,589)
CASH AND CASH EQUIVALENTS:                                                                      
  BEGINNING OF YEAR                                                  16,642              10,177
                                                                   --------            --------
  END OF PERIOD                                                    $  6,900            $  5,588
                                                                   ========            ========
                                                                                                
SUPPLEMENTAL DISCLOSURES:                                                                       
  Interest paid                                                    $     62            $     56
  Income taxes paid, net of refunds                                     192                 908
                                                                                                
NON CASH TRANSACTIONS:                                                                          
  Details of medical practice transaction -                                                     
    Liabilities assumed                                                 (20)                  -
    Deferred tax liability for book and tax basis difference         (2,204)                  -
    Common stock and additional paid in capital                                                 
      issued and to be issued                                          (757)                  -
  Others-                                                                                       
    Dividends on Series A & B preferred stock                         1,880                 150
    Equipment acquired under capital leases                             212                 401 
 
</TABLE>



        The accompanying notes are an integral part of this statement.

                                       4
<PAGE>
 
                         INTEGRATED ORTHOPAEDICS, INC.
                    NOTES TO INTERIM CONDENSED CONSOLIDATED
                             FINANCIAL STATEMENTS
                                  (UNAUDITED)
                                        
NOTE 1 - ORGANIZATION AND BASIS OF PRESENTATION

ORGANIZATION - Integrated Orthopaedics, Inc. ("IOI" or the "Company") is a
physician practice management  ("PPM") company specializing in the management of
orthopaedic medicine practices and other musculoskeletal-related patient
services.  As of September 30, 1998, the Company provides comprehensive
management services under long-term agreements to four orthopaedic practices in
four states.  The Company also owns and operates two work hardening facilities
in Houston, Texas.

BASIS OF PRESENTATION. The accompanying unaudited condensed consolidated
financial statements have been prepared in accordance with generally accepted
accounting principles for interim financial information and with the
instructions to Form 10-QSB.  Accordingly, they do not include all of the
information and footnotes required by generally accepted accounting principles
for complete financial statements.  In the opinion of management, all
adjustments (consisting only of those of a normal recurring nature) considered
necessary for a fair presentation have been included.  Operating results for the
quarterly period and nine months ended September 30, 1998 are not necessarily
indicative of the results that may be expected for the year ending December 31,
1998. These financial statements should be read in conjunction with the audited
consolidated financial statements and notes thereto for the year ended
December 31, 1997, as filed with the Securities and Exchange Commission on
Form 10-KSB Annual Report.

For periods prior to and ending September 30, 1997, the Company consolidated the
operations of its affiliated physician practices for financial reporting
purposes.  In compliance with FASB EITF 97-2, the Company commenced reporting
its financial results on a non consolidated basis, beginning with the year ended
December 31, 1997.  Accordingly, results for the quarter and nine months ended
September 30, 1997 have been restated to reflect the adoption of non-
consolidated accounting.

Effective January 1, 1998, the Company adopted Statement of Financial Accounting
Standards ("SFAS") No. 130, "Reporting Comprehensive Income." SFAS 130
establishes standards for reporting and disclosure of comprehensive income and
its components in the financial statements. SFAS 130 requires unrealized gains
or losses on the Company's available-for-sale securities, which prior to
adoption were reported separately in stockholders' equity to be included in
other comprehensive income.  The adoption of this pronouncement had no impact on
the Company's net loss or stockholders' equity.

As a result of certain recent developments in the PPM industry, the Company
elected to change the amortization period of all its management service
agreements from 40 years to 25 years on a prospective basis beginning July 1,
1998. This 25 years amortization period initiates at the execution date of all
the management service agreements. This change in accounting estimate increased
loss per share by $0.02 in the quarter ending September 30, 1998, excluding the
effect of new management service agreements to be executed in the future.

The preparation of consolidated financial statements in accordance with
generally accepted accounting principles requires management to make estimates
and assumptions that affect the reported amounts of assets, liabilities,
revenues and expenses, as well as the disclosures of contingent assets and
liabilities. Because of the inherent uncertainties in this process, actual
future results could differ from those expected at the reporting date.

NOTE 2 - MEDICAL SERVICE REVENUE

Medical service revenue for services delivered by the medical groups affiliated
with the Company is recognized by the medical groups when the services are
rendered based on established or negotiated charges reduced by contractual
adjustments and allowances for doubtful accounts.  Differences between estimated
contractual adjustments and final settlements are reported in the period when
the final settlements are determined.

                                       5
<PAGE>
 
                         INTEGRATED ORTHOPAEDICS, INC.
                    NOTES TO INTERIM CONDENSED CONSOLIDATED
                             FINANCIAL STATEMENTS
                                  (Unaudited)

Medical service revenue of the affiliated medical groups is reduced by amounts
retained by the medical groups to arrive at the Company's revenue. Substantially
all of the amounts retained by the affiliated physician groups under management
were the minimum contractual percentage in the first nine months of 1998.

The following represents the amounts included in the determination of the
Company's revenues (in thousands):

<TABLE>
<CAPTION>
                                                    THREE MONTHS           NINE MONTHS
                                                 ENDED SEPTEMBER 30,    ENDED SEPTEMBER 30,
                                                 -------------------    -------------------
                                                   1998       1997        1998       1997
                                                 --------   --------    --------   --------
<S>                                              <C>        <C>       <C>           <C>
 
Medical Service Revenue                          $ 4,826    $ 2,061       $13,739   $ 5,935
Less: Amounts Retained by Medical Groups           1,518        675         4,711     2,037
                                                 -------    -------       -------   -------
 
Revenues                                         $ 3,308    $ 1,386       $ 9,028   $ 3,898
                                                 =======    =======       =======   =======
 
Management Services Agreements at period end           4          1             4         1
</TABLE>

NOTE 3 - LOSS PER COMMON SHARE

Basic loss per share excludes dilution and is computed by dividing loss
available to common stockholders by the weighted average number of common shares
outstanding for the period.  Diluted loss per share reflects the potential
dilution that could occur if securities or other contracts to issue common stock
were exercised or converted into common stock.

The components of basic loss per share are as follows (in thousands, except per
share data):

<TABLE>
<CAPTION>
 
                                            THREE MONTHS ENDED SEPTEMBER 30
                                       -----------------------------------------
                                         1998         EPS         1997        EPS
                                       --------    ---------    --------    --------
<S>                                    <C>         <C>          <C>         <C>
Net loss                               $   (810)    $ (0.12)    $ (325)     $ (0.06)
Series A Preferred Stock Dividend           (50)      (0.01)       (50)       (0.01)
Series B Preferred Stock Dividend          (596)      (0.09)         -            -
                                       --------     -------     ------      -------
Loss applicable to common shares       $ (1,456)    $ (0.22)    $ (375)     $ (0.07)
                                       ========     =======     ======      =======
Weighted average common shares
  outstanding                             6,506                  5,292
                                       ========                =======
                                             NINE MONTHS ENDED SEPTEMBER 30
                                       ------------------------------------
                                         1998         EPS         1997        EPS
                                       --------    ---------    --------    --------
Net loss                               $ (2,654)    $ (0.41)    $ (774)     $ (0.14)
Series A Preferred Stock Dividend          (151)      (0.02)      (150)       (0.03)
Series B Preferred Stock Dividend        (1,729)      (0.27)         -            -
                                       --------     -------     ------      -------
Loss applicable to common shares       $ (4,534)    $ (0.70)    $ (924)     $ (0.17)
                                       ========     =======     ======      =======
Weighted average common shares
  outstanding                             6,437                  5,289
                                       ========                 ======
</TABLE>

                                       6
<PAGE>
 
                         INTEGRATED ORTHOPAEDICS, INC.
                    NOTES TO INTERIM CONDENSED CONSOLIDATED
                             FINANCIAL STATEMENTS
                                  (Unaudited)

For the quarterly period and nine months ended September 30, 1998 and 1997, the
diluted weighted average shares excluded the following as the issuance or
conversion of these instruments results in anti-dilution (shares in thousands):

<TABLE>
<CAPTION>
 
                                                     1998                1997
                                               -----------------   -----------------
                                                        WEIGHTED            WEIGHTED
                                                        AVERAGE             AVERAGE
                                                        EXERCISE            EXERCISE
                                               SHARES    PRICE     SHARES    PRICE
                                               ------   --------   ------   --------
<S>                                            <C>       <C>       <C>       <C>
 
Employee stock options to purchase
   common stock                                 1,321    $ 4.78    1,360     $ 4.61
Warrants to purchase common stock                 200      2.13      200       2.13
Non employee stock options to purchase
   common stock                                    58      4.15       98       4.17
Series A Preferred Stock convertible into
   common stock                                   858         -      800          -
Series B Preferred Stock convertible into
   common stock                                 4,474         -        -          -
 
</TABLE>

NOTE 4 - MEDICAL PRACTICE TRANSACTIONS

On March 12, 1998, the Company acquired certain assets and entered into a long-
term management agreement, effective March 1, 1998, with a six-physician
orthopaedic medical practice group in Longmont, Colorado ("Front Range
Orthopedic Center") for consideration totaling approximately $4.6 million.  Such
consideration consisted primarily of  (i) cash and estimated transaction costs
totaling $3.8 million and (ii) issuance of common stock valued at $757,000 for
169,694 shares of the Company's common stock, of which 30,001 shares will be
delivered on March 11, 2003.  The consideration paid for the medical group to
enter into the long-term management service agreement ("MSA") and for the non-
medical assets of the medical group, primarily receivables and fixed assets, has
been accounted for as an asset purchase.  The Company recorded MSA costs of
$5.8 million, including a $2.2 million deferred tax liability related to the
recognition of book and tax basis differences of assets acquired in the medical
practice transaction, which is being amortized on a straight line basis over an
estimated useful life of 25 years (40 years prior to July 1, 1998).  The results
of Front Range Orthopedic Center have been included in the operations of the
Company since March 1, 1998.

On July 17, 1998, the Company paid $500,000 to an affiliated medical group, of
which $250,000 was to repurchase 47,081 shares of the Company's common stock and
$250,000 was to fulfill a contingent earnings agreement stated within the MSA.

On September 30, 1998, the Company paid $360,000 in cash and issued common stock
valued at $90,000 for 18,218 shares of the Company's common stock to a physician
as consideration to amend an existing MSA to include such physician as an
employee and shareholder of an affiliated medical group. The Company recorded
MSA costs of $450,000, which is being amortized on a straight line basis over an
estimated useful life of 25 years.

The following unaudited pro forma consolidated results of operations for the
nine months ended September 30, 1998 and 1997 assume that the following
transactions were consummated on January 1, 1997: (i) the affiliation
transaction with a physician in September 1998, (ii) the affiliation transaction
with Front Range Orthopedic Center in March 1998, (iii) the issuance of the
Series B Preferred Stock in December 1997, (iv) the affiliation transactions
with three medical practices during the three months ended December 31, 1997

                                       7
<PAGE>
 
                         INTEGRATED ORTHOPAEDICS, INC.
                    NOTES TO INTERIM CONDENSED CONSOLIDATED
                             FINANCIAL STATEMENTS
                                  (Unaudited)

and (v) the divestiture of the affiliated musculoskeletal-related healthcare
delivery system in Houston, Texas in November 1997, with the Company retaining
the operations of two work hardening facilities. The pro forma information does
not purport to be indicative of the results of operations that actually would
have been attained if the transactions described above occurred on January 1,
1997 ($ in thousands, except loss per share):

<TABLE>
<CAPTION>
 
                                        NINE MONTHS ENDED SEPTEMBER 30,
                                      -----------------------------------
                                           1998              1997(a)
                                      ---------------   -----------------
<S>                                      <C>               <C>
 
Revenue                                  $ 9,648           $ 9,424
                                         =======           =======
 
Net income (loss)                        $(2,441)          $   314
                                         =======           =======
 
Loss applicable to common shares         $(4,321)          $(1,565)
                                         =======           =======
 
Loss per common share
   Basic                                 $ (0.66)          $ (0.24)
                                         =======           =======
   Diluted                               $ (0.66)          $ (0.24)
                                         =======           =======
- -----------------
</TABLE>

(a)  Includes $628,000 gain from divestitures and discontinued operations
     related to the 1996 sale of the Company's occupational medicine businesses
     due to the completion of certain transactions at lower than expected costs.


NOTE 5 - LONG TERM DEBT

On July 14, 1998, the Company entered into a credit agreement (the "Credit
Agreement"), which provided for a $65.0 million three-year Revolving Credit
Facility (the "Credit Facility").  The Credit Facility is available for (i)
general corporate purposes, including funding working capital needs,
acquisitions and capital expenditures, and (ii) issuance of letters of credit up
to $5.0 million, with a maximum working capital commitment of $15.0 million. The
Credit Facility will expire on July 10, 2001.  Borrowings under the Credit
Facility bear interest at the Company's option, at (i) LIBOR plus a margin
ranging from 1.0% to 2.25% or (ii) the higher of the Federal Funds Rate plus .5%
or the prime rate, plus a margin ranging from 0.0% to .5%.  The Company is
required to pay annual commitment fees ranging from .25% to .5% of the unused
portion of the Credit Facility.  Letters of credit under the Credit Facility
require annual fees ranging from 1.0% to 2.25% of the outstanding amount of the
letters of credit.

The Credit Facility is secured by a first priority interest in the capital stock
of substantially all of the Company's present and future subsidiaries. The terms
of the Credit Agreement include certain restrictive covenants. Among other
restrictions, the covenants include limitations on investments, borrowings,
liens, acquisitions and dispositions of assets and transactions with affiliates,
and require maintenance of certain ratios regarding interest and fixed charge
coverage, leverage and minimum net worth. As of November 13, 1998, as a result
of operating losses incurred during the most recent 12-month period, the Company
was not in compliance with certain financial covenants.  The Company cannot
borrow under the Credit Facility until it is in compliance with the conditions
specified in the Credit Agreement. See discussion under Part I - Item  2
"Liquidity and Capital Resources." The Company incurred approximately $1.0
million in deferred financing costs in connection with the Credit Agreement,
which will be amortized over a three-year period.

                                       8
<PAGE>
 
                                    PART I
                             FINANCIAL INFORMATION

ITEM 2.  MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS
         OF OPERATIONS.

FORWARD LOOKING STATEMENTS

Certain of the comments that follow or that appear elsewhere in this quarterly
report represent forward-looking statements with respect to the Company's future
results of operations and its related capital resources and financial condition.
The Company relies on a variety of internal and external information as well as
management judgment in order to develop such forward-looking statements. Because
of the inherent limitations in this process, the relatively volatile nature of
the industry in which the Company operates, and other risks and uncertainties
including those discussed in this quarterly report and the Company's annual
report on Form 10-KSB, there can be no assurance that actual results will not
differ materially from these forward-looking statements.


RESULTS OF OPERATIONS

GENERAL

Since October 1, 1997, the Company has entered into long term management service
agreements ("MSA") with four orthopaedic medicine practices. In December 1997,
IOI terminated its MSA with a Houston, Texas musculoskeletal-related healthcare
delivery system (the "1997 divestiture"), which represented substantially all of
its business from January 1, 1997 to October 1, 1997. In December 1997, the
Company also completed the issuance of its Series B Preferred Stock for net
proceeds of $24.5 million. Additionally, to implement its musculoskeletal-
related physician practice management ("PPM") expansion strategy, the Company
began building its corporate infrastructure during the fourth quarter of 1996
and continued to make key employee additions throughout 1997 and the 1998 year-
to-date period.  Accordingly, the Company's financial position and portfolio of
operating entities for the quarterly period and nine months ended September 30,
1998 were significantly different from those in the 1997 comparable periods.

THREE MONTHS ENDED SEPTEMBER 30, 1998 COMPARED WITH THREE MONTHS ENDED
SEPTEMBER 30, 1997.

REVENUES

Revenues for the three months ended September 30, 1998 were $3.3 million, an
increase of $1.9 million, or 138.7%, over revenues of $1.4 million for the same
period of 1997.  Of the $1.9 million increase, $2.5 million was contributed by
the four physician practices managed since October 1997, offset by a decrease of
$508,000 attributable to the 1997 divestiture and $32,000 attributable to the
two work hardening facilities retained from the 1997 divestiture.

PRACTICE COMPENSATION AND BENEFITS:

Overall practice compensation and benefit costs increased $548,000, or 96.6%,
from $567,000 in 1997 to $1.1 million in 1998.  These costs increased by
$942,000 due to the addition of the four physician practices and decreased by
$394,000 largely as a result of the 1997 divestiture.

OTHER DIRECT COSTS:

Overall direct costs increased $603,000, or 163.0%, from $370,000 in 1997 to
$973,000 in 1998. Of the increase, $880,000 was due primarily to the addition of
the four physician practices, offset by a decrease of $277,000 attributable to
the 1997 divestiture.

                                       9
<PAGE>
 
GENERAL AND ADMINISTRATIVE EXPENSES:

General and administrative expenses for the third quarter increased $382,000, or
33.4%, from $1.1 million in 1997 to $1.5 million in 1998.  Such increase was due
primarily to (i) increased salary, compensation and recruiting costs related to
additional senior management and staff to support the Company's business
strategy, (ii) increased travel and communication costs related to business
development and management of the four physician practices located in various
states and (iii) additional costs to support a higher level of staffing.

DEPRECIATION AND AMORTIZATION:

Depreciation and amortization increased $400,000 over the same period in 1997,
of which $371,000 was attributable to the four physician practices and $37,000
to the corporate offices, offset by a decrease of $8,000 at the two work
hardening facilities.

GAIN FROM DIVESTITURES AND DISCONTINUED OPERATIONS:

The Company reported a gain from divestitures and discontinued operations of
$150,000 during the third quarter of 1997 as related to the 1996 sale of its
occupational medicine businesses due to the completion of certain transactions
at lower than expected costs.

INTEREST INCOME:

Interest income during the third quarter increased by $18,000 from 1997 to 1998,
with the increase primarily attributable to investment earnings on net proceeds
received from the issuance of the Series B Preferred Stock completed in December
1997.

INTEREST EXPENSE:

Interest expense during the quarter increased $143,000 from 1997 to 1998, with
the increase primarily attributable to the amortization of deferred financing
costs and commitment fees associated with the $65.0 million Revolving Credit
Facility entered into in July 1998 and capital leases entered into since October
1997.

NET LOSS/LOSS PER COMMON SHARE

Net loss for the quarter ended September 30, 1998 was $810,000, as compared to
$325,000 for the same period in 1997.  Because the Company has a recent history
of losses, management continues to provide a valuation allowance in full for the
net operating loss deferred tax asset. Accordingly, no tax benefit has been
recognized with respect to the 1998 operating loss.

Loss per common share was $0.22 in 1998, as compared with $0.07 for the same
period of 1997, on a 22.9% increase in shares outstanding and an incremental
increase in dividends payable to preferred stockholders of $596,000.  The
increase in shares outstanding was attributable to shares issued since October
1997 involving the four medical practice transactions.  The increase in
dividends payable to preferred stockholders was attributable to the issuance of
the Series B Preferred Stock in December 1997.


NINE MONTHS ENDED SEPTEMBER 30, 1998 COMPARED WITH NINE MONTHS ENDED
SEPTEMBER 30, 1997.

REVENUES

Revenues for the nine months ended September 30, 1998 were $9.0 million, an
increase of $5.1 million, or 131.6%, over revenues of $3.9 million for the same
period of 1997.  Of the $5.1 million increase, $7.2 million was contributed by
the four physician practices managed since October 1997, offset by a decrease of
$1.9 million attributable to the 1997 divestiture and $134,000 attributable to
the two work hardening facilities.

                                       10
<PAGE>
 
PRACTICE COMPENSATION AND BENEFITS:

Overall practice compensation and benefit costs increased $1.3 million, or 70.7%
from $1.8 million in 1997 to $3.1 million in 1998.  These costs increased by
$2.5 million due to the addition of the four physician practices, offset by a
decrease of $1.1 million attributable to the 1997 divestiture and $135,000
attributable to the two work hardening facilities.

OTHER DIRECT COSTS:

Overall direct costs increased $1.9 million, or 197.7%, from $965,000 in 1997 to
$2.9 million in 1998. Of the increase, $2.5 million was due primarily to the
addition of the four physician practices, offset by a decrease of $557,000
attributable to the 1997 divestiture and $59,000 attributable to the two work
hardening facilities.

GENERAL AND ADMINISTRATIVE EXPENSES:

General and administrative expenses for the nine months ended September 30, 1998
increased $1.8 million, or 59.2%, from $3.0 million in 1997 to $4.8 million in
1998.  Such increase was due primarily to (i) increased salary, compensation and
recruiting costs related to additional senior management and staff to support
the Company's business strategy, (ii) increased travel and communication costs
related to business development and management of the four physician practices
located in various states and (iii) additional costs to support a higher level
of staffing.

DEPRECIATION AND AMORTIZATION:

Depreciation and amortization increased $893,000 over the same period of 1997,
of which $808,000 was attributable to the four physician practices and $126,000
to the corporate offices, net of a decrease of $41,000 associated with the 1997
divestiture.

GAIN FROM DIVESTITURES AND DISCONTINUED OPERATIONS:

The Company reported a gain from divestitures and discontinued operations of
$628,000 during the nine months ended September 30, 1998 as related to the 1996
sale of its occupational medicine businesses due to the completion of certain
transactions at lower than expected costs.

INTEREST INCOME:

Interest income increased by $147,000 from 1997 to 1998, with the increase
primarily attributable to investment earnings on net proceeds received from the
issuance of the Series B Preferred Stock completed in December 1997.

INTEREST EXPENSE:

Interest expense increased $177,000 from 1997 to 1998, with the increase
primarily attributable to the amortization of deferred financing costs and
commitment fees associated with the $65.0 million Revolving Credit Facility
entered into in July 1998 and capital leases entered into since October 1997.

NET LOSS/LOSS PER COMMON SHARE

Net loss for the nine months ended September 30, 1998 was $2.7 million, as
compared to $774,000 for the same period in 1997.  Because the Company has a
recent history of losses, management continues to provide a valuation allowance
in full for the net operating loss deferred tax asset. Accordingly, no tax
benefit has been recognized with respect to the 1998 operating loss.

Loss per common share was $0.70 in 1998, as compared with $0.17 for the same
period of 1997, on a 21.7% increase in shares outstanding and an incremental
increase in dividends payable to preferred stockholders

                                       11
<PAGE>
 
of $1.7 million. The increase in shares outstanding was attributable to shares
issued since October 1997 involving the four medical practice transactions. The
increase in dividends payable to preferred stockholders was attributable to the
issuance of the Series B Preferred Stock in December 1997.

LIQUIDITY AND CAPITAL RESOURCES:

Net cash used in operating activities for the nine months ended September 30,
1998 was $2.0 million, compared to $2.8 million for the same period of 1997, as
the Company continues to incur losses while building its management and
operational infrastructure as a PPM company.  Net cash used in investing
activities increased $4.5 million from $393,000 in 1997 to $4.9 million in 1998,
due primarily to the use of $4.7 million in 1998 in medical practice
transactions.  Net cash used in financing activities was $2.8 million in 1998,
as compared to $1.4 million in 1997.  The cash used in 1998 was to pay a non-
interest bearing obligation issued in October 1997 in a physician medical
practice transaction and deferred financing costs associated with the $65.0
million Revolving Credit Facility. The 1997 payment represented amounts paid on
bank borrowings. Net working capital was $9.1 million at September 30, 1998, as
compared to $16.0 million at December 31, 1997. The decrease was due primarily
to a use of cash during 1998 in medical practice transactions and losses
incurred in the first half of 1998.

On July 14, 1998, the Company entered into a credit agreement (the "Credit
Agreement"), which provides for a revolving line of credit in the amount of
$65.0 million (the "Credit Facility"). The Credit Facility is available for
working capital purposes, to fund acquisitions, to finance capital expenditures
and for the issuance of letters of credit. See Item 1 - Note 5 for a more
detailed description of the Credit Agreement. The Credit Agreement requires the
Company to meet certain conditions preceding any borrowings. As of November 13,
1998, the Company was not in compliance with certain financial covenants as a
result of operating losses incurred during the most recent 12-month period.
Management anticipates that the Company will be able to meet all conditions
under the Credit Agreement and have access to the Credit Facility as the needs
arise. The Company intends to use its existing cash balance, additional
financing through equity investment or strategic partnering to enter into MSA's
with other orthopaedic medical groups in order to generate the additional
earnings necessary to meet the financial covenants under the Credit Agreement.

The Company anticipates that its current cash balance and borrowings under the
Credit Facility, subject to meeting all pre-borrowing conditions as noted above,
will be sufficient to fund future acquisition, capital expenditure and working
capital requirements through 1998. There can be no assurance that future
developments in the PPM industry or general economic trends will not adversely
affect the Company's operations or its ability to meet future funding
requirements.

YEAR 2000 COMPLIANCE:

The Company has completed the process of conducting a review of its internal
computer systems.  All of the Company's software products, including without
limitation, any parts or components thereof, when used prior to, during, and
after the turn of the century, are programmed to process turn-of-the-century
dates.  This capability includes, without limitation, date formats that have
multi-century formulas and date values, date interface values that reflect the
century, and calculations that accommodate the occurrence of leap year.  The
Company is in the process of querying its vendors and clients regarding any
millennium compliance issues that could have a material impact on the Company or
its results of operations.  To date, the Company has not incurred any material
expense regarding millennium compliance issues and any future expense that might
be incurred is not considered at this time to be material.  There can be no
assurance, however, that the year 2000 compliance will not present unforeseen
problems in the systems of the Company and the third parties with which the
Company deals, such as third party payors.  Failure of the Company's or third
parties' computer systems could materially and adversely impact the Company's
operations.

OTHER MATTERS:

Due to changes in recent market conditions, in the general equity markets, in
the PPM sector, and particularly in the orthopaedic single specialty area, and
other unforeseen conditions, the Company has delayed completion of the
acquisition transactions as previously announced in the press release issued on
September 11, 1998. Acquisitions

                                       12
<PAGE>
 
have been delayed as management seeks to redefine the Company
growth strategy by considering new alternatives, relative to traditional equity-
based acquisition of physicians' practices, for structuring management services
relationships with physicians.  Management anticipates offering a portfolio of
physician management services alternatives, to potentially include consulting
services, equity joint ventures for ancillary services, non-equity management
services relationships and equity-based management services relationships.  The
development of alternative financial relationships is expected to generate
broader appeal for the Company's services within the musculoskeletal market, by
expanding access to physician practices for whom equity based acquisitions are
not financially appropriate or appealing.  Management also anticipates that such
a portfolio of services will provide the Company with the opportunity to achieve
sustainable revenue and earnings growth, irrespective of variable conditions in
the equity capital markets, while enhancing shareholder value and return on
capital.

                                       13
<PAGE>
 
                                    PART II
                               OTHER INFORMATION
                                        
ITEM 1.  LEGAL PROCEEDINGS

         The Company is not a party to any pending litigation other than routine
         litigation incidental to the business or that which is immaterial in
         the amount of damages sought.

ITEM 2.  CHANGES IN SECURITIES

         On September 30, 1998, the Company paid $360,000 in cash and issued
         18,218 shares of the Company's common stock to a physician as
         consideration to amend an existing MSA to include such physician as an
         employee and shareholder of an affiliated medical group. No
         underwriters were involved with the transaction described above. The
         issuance of the Company's common stock in connection with the
         transaction was exempt from the registration provisions of Section 5 of
         the Securities Act of 1933, as amended (the "Act"), by virtue of
         Section 4(2) of the Act.

ITEM 3.  DEFAULTS UPON SENIOR SECURITIES

         None.

ITEM 4.  SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

         None.

ITEM 5.  OTHER INFORMATION

         None.
 
ITEM 6.  EXHIBITS AND REPORTS ON FORM 8-K.

         a)    Exhibits:

         2.4   Stock Purchase and Sale Agreement dated as of July 17, 1998, by
               and between Integrated Orthopaedics, Inc. and Merritt Orthopaedic
               Associates, P.C.

         10.28 Amendment, effective July 17, 1998, to Management Services
               Agreement effective September 22, 1997, among Integrated
               Orthopaedics, Inc., IOI management Services of Connecticut, Inc.,
               Merritt Orthopaedic Associates, P.C., Patrick J. Carolan, M.D.
               and Mark E. Wilchinsky, M.D.

         10.29 $65 Million Revolving Credit Agreement dated as of July 10, 1998,
               among Integrated Orthopaedics, Inc., Borrower, Nationsbank, N.A.,
               Administrative Agent, and the Lenders named therein.

         11    Statement re computation of per share earnings.

         27    Financial Data Schedule.

         b)    Reports on Form 8-K:

               None.

                                       14
<PAGE>
 
                                   SIGNATURE

In accordance with the requirements of the Exchange Act, the registrant caused
this report to be signed on its behalf by the undersigned, thereunto duly
authorized.



                                       INTEGRATED ORTHOPAEDICS, INC.



Date: November 13, 1998                By: /s/ Ronald E. Pierce
                                          -------------------------------------
                                        RONALD E. PIERCE
                                        President and Chief Executive Officer
                                        (Acting Chief Accounting Officer
                                        and Principal Financial Officer)

                                       15

<PAGE>
 
                                                               EXHIBIT 2.4

                       STOCK PURCHASE AND SALE AGREEMENT


          THIS STOCK PURCHASE AND SALE AGREEMENT (the "Agreement") is made and
entered into this 17th day of July, 1998, by and between INTEGRATED
ORTHOPAEDICS, INC., a Texas corporation ("IOI"), and MERRITT ORTHOPAEDIC
ASSOCIATES, P.C., a Connecticut professional corporation ("Merritt").

          WHEREAS, Merritt currently holds shares of IOI common stock, par value
$.001 per share ("Common Stock"), which shares are subject to certain resale
restrictions under the securities laws with respect to sales to third parties;
and

          WHEREAS, Merritt has an opportunity to modify its relationship with
Dr. Gerard J. Girasole, M.D. ("Girasole") whereby Girasole would become a
shareholder of Merritt; and

          WHEREAS, by becoming a shareholder in Merritt, Girasole would appear
to be manifesting an intent to practice with Merritt for an extended period
which would likely exceed the term of his current employment contract with
Merritt; and

          WHEREAS, a long-term relationship between Girasole and Merritt would
likely benefit directly or indirectly, Merritt and IOI, as Merritt's manager;
and

          WHEREAS, in order to modify its relationship on terms acceptable to
Girasole, Merritt requires certain amounts of cash beyond its current liquidity
levels; and

          WHEREAS, in order to provide liquidity for its transaction with
Girasole, Merritt has requested that IOI acquire from Merritt certain shares of
Common Stock;

          NOW, THEREFORE, in consideration of the mutual conditions, agreements,
covenants and premises contained herein, and other good and valuable
consideration, the receipt and sufficiency of which are hereby acknowledged and
accepted, the parties hereto hereby agree as follows:


                                   ARTICLE I
                          PURCHASE AND SALE OF STOCK

          1.01 SALE AND PURCHASE OF COMMON STOCK. Subject to the terms and
conditions of this Agreement, at the Closing, Merritt will sell, transfer and
assign to IOI, and IOI will purchase from Merritt the number of whole shares
(rounded to the nearest whole number, the "Shares") of Common Stock equal to Two
Hundred Fifty Thousand and No/100 Dollars ($250,000.00) divided by the Share
Price (as defined below).
<PAGE>
 
          1.02 PURCHASE PRICE. The total purchase price to be paid by IOI to
Merritt for the Shares sold hereunder shall be Two Hundred Fifty Thousand and
No/100 Dollars ($250,000.00) (the "Purchase Price"). The Purchase Price shall be
paid by IOI to Merritt by wire transfer of immediately available funds.

          1.03 SHARE PRICE. As used in this Agreement, the term "Share Price"
shall mean Five and 31/100 Dollars ($5.31).

          1.04 CLOSING. The transfer of the Shares by Merritt to IOI and the
consummation of the other transactions contemplated hereby and the execution and
delivery of documents required hereby (the "Closing") shall take place at the
offices of IOI, 5858 Westheimer, Suite 500, Houston, Texas 77057, at or about
10:00 a.m., July 17, 1998, or at such other time and place as the parties hereto
may otherwise agree to in writing, but in any event on or before July 31, 1998.
The date of the Closing shall be referred to herein as the "Closing Date."

                                  ARTICLE II
             COVENANTS, REPRESENTATIONS AND WARRANTIES OF MERRITT

          Merritt covenants, represents and warrants to IOI as follows:

          2.01 ORGANIZATION. Merritt is a professional corporation duly
organized, validly existing and in good standing under the laws of the State of
Connecticut, has all necessary corporate power to own its properties and to
carry on its business as now owned and operated by it.

          2.02 AUTHORITY AND CONSENT. Merritt has all requisite right, power and
authority to enter into, and perform its obligations under this Agreement. The
execution and delivery of this Agreement by Merritt has been duly authorized by
its board of directors in accordance with all applicable laws to which Merritt
is subject. All consents and approvals required for Merritt to consummate the
transactions contemplated by this Agreement have been obtained. Merritt has the
full power and legal authority to execute and perform its obligations under this
Agreement. The execution and delivery of this Agreement, consummation by Merritt
of the transactions contemplated hereby and compliance by Merritt with any of
the provisions hereof will not (i) conflict with or result in a breach or
default under any of the terms, conditions or provisions of any note, bond,
mortgage, indenture, license, agreement or other instrument or obligation to
which Merritt is a party or by which its properties or assets are bound, or any
provision of its certificate of incorporation or by-laws, or (ii) violate any
order writ, injunction, decree or statute or any rule or regulation applicable
to Merritt or any properties or assets of Merritt.

          2.03 VALID AND BINDING OBLIGATION. This Agreement is a legal, valid
and binding obligation of Merritt, enforceable in accordance with its terms
(except that enforcement may be subject to any applicable bankruptcy, insolvency
or similar laws generally affecting the enforcement of creditors' rights).

                                      -2-
<PAGE>
 
          2.04 OWNERSHIP OF THE SHARES. Merritt is, and shall be, as of the
Closing Date, the owner, beneficially and of record, of the Shares. Merritt has
good and marketable title to the Shares and has full power and authority to
sell, assign and transfer, and at the Closing will sell, assign and transfer,
the Shares to IOI, free and clear of all liens, encumbrances, security
agreements, equities, options, calls, pledges, trusts, voting trusts and other
shareholder agreements, assessments, covenants, reservations, commitments,
claims, charges and restrictions or other liabilities or obligations of any kind
or character.

          2.05 NO BROKER'S OR FINDER'S FEES. There is no agent's, broker's,
finder's fee or commission payable in connection with the transaction
contemplated hereby by virtue of or resulting from any action or agreement by
Merritt. Merritt hereby agrees to indemnify IOI against any claim, demand,
liability, loss, cost or expense (including court costs and attorneys' fees) on
account of or in connection with any breach of the foregoing warranty.

                                  ARTICLE III
               COVENANTS, REPRESENTATIONS AND WARRANTIES OF IOI

          IOI covenants, represents and warrants to Merritt as follows:

          3.01 ORGANIZATION. IOI is a corporation duly organized, validly
existing and in good standing under the laws of the State of Texas, has all
necessary corporate power to own its properties and to carry on its business as
now owned and operated by it.

          3.02 AUTHORITY AND CONSENT. IOI has all requisite right, power and
authority to enter into, and perform its obligations under this Agreement. The
execution and delivery of this Agreement by IOI has been duly authorized by its
board of directors in accordance with all applicable laws to which IOI is
subject. All consents and approvals required for IOI to consummate the
transactions contemplated by this Agreement have been obtained. IOI has the full
power and legal authority to execute and perform its obligations under this
Agreement.

          3.03 VALID AND BINDING OBLIGATION. This Agreement is a legal, valid
and binding obligation of IOI, enforceable in accordance with its terms (except
that enforcement may be subject to any applicable bankruptcy, insolvency or
similar laws generally affecting the enforcement of creditors' rights).

          3.04 NO BROKER'S OR FINDER'S FEES. There is no agent's, broker's,
finder's fee or commission payable in connection with the transaction
contemplated hereby by virtue of or resulting from any action or agreement by
IOI. IOI hereby agrees to indemnify Merritt against any claim, demand,
liability, loss, cost or expense (including court costs and attorneys' fees) on
account of or in connection with any breach of the foregoing warranty.

                                      -3-
<PAGE>
 
                                  ARTICLE IV
                   CONDITIONS PRECEDENT TO IOI'S PERFORMANCE

          All obligations of IOI hereunder are subject, at the option of IOI, to
the fulfillment of each of the following conditions at or prior to the Closing,
and Merritt shall use its best efforts to cause each such condition to be so
fulfilled:

          4.01 ACCURACY OF REPRESENTATIONS AND WARRANTIES. The representations
and warranties of Merritt contained herein or in any certificate, schedule or
other document delivered pursuant to the provisions hereof or in connection
herewith shall be true and correct in all material respects as of the Closing
Date with the same effect as though such representations and warranties had been
made at the Closing Date.

          4.02 PERFORMANCE BY MERRITT. Merritt shall have executed and delivered
all documents and performed and complied in all material respects with all
agreements and conditions required by this Agreement to be performed or complied
with by it prior to or on the Closing Date.

                                   ARTICLE V
                 CONDITIONS PRECEDENT TO MERRITT'S PERFORMANCE

          All obligations of Merritt hereunder are subject, at the option of
Merritt, to the fulfillment of each of the following conditions at or prior to
the Closing, and IOI shall use its best efforts to cause each such condition to
be so fulfilled:

          5.01 ACCURACY OF REPRESENTATIONS AND WARRANTIES. The representations
and warranties of IOI contained herein or in any certificate, schedule or other
document delivered pursuant to the provisions hereof or in connection herewith
shall be true and correct in all material respects as of the Closing Date with
the same effect as though such representations and warranties had been made at
the Closing Date.

          5.02 PERFORMANCE BY IOI. IOI shall have executed and delivered all
documents and performed and complied in all material respects with all
agreements and conditions required by this Agreement to be performed or complied
with by it prior to or on the Closing Date.

                                  ARTICLE VI
                              CLOSING OBLIGATIONS

          6.01 CONTINGENT UPON SATISFACTION OF CONDITIONS PRECEDENT. The Closing
is contingent upon the prior satisfaction by IOI and Merritt of the conditions
recited in Articles IV and V hereof and the other conditions set forth herein.

                                      -4-
<PAGE>
 
          6.02 MERRITT'S OBLIGATIONS. At the Closing, Merritt shall deliver to
IOI, the following:

     (a) certificates representing the Shares registered in the name of Merritt,
duly endorsed by Merritt for transfer or accompanied by a stock power duly
executed by Merritt; and

     (b) all other items required to be delivered hereunder or as may be
requested by IOI which are necessary or would reasonably facilitate consummation
of the transactions contemplated hereby.

          6.03 IOI'S OBLIGATIONS. At the Closing, IOI shall deliver to Merritt,
the following:

     (a) the Purchase Price, by wire transfer of immediately available funds to
an account designated by Merritt; and

     (b) all other items required to be delivered hereunder or as may be
requested by Merritt which are necessary or would reasonably facilitate
consummation of the transactions contemplated hereby.

                                  ARTICLE VII
                      MERRITT'S OBLIGATIONS AFTER CLOSING

          7.01 MERRITT'S INDEMNITY. Merritt shall indemnify and hold harmless
IOI, its officers, directors, employees, agents and representatives, against and
in respect of any and all claims, demands, losses, expenses (including
reasonable attorneys' fees), obligations, amounts liabilities, damages,
recoveries and deficiencies, including interest and penalties, that result or
arise from any misrepresentation, breach of warranty or breach or nonfulfillment
of any agreement or covenant on the part of Merritt contained in this Agreement
or in any schedule, certificate, or other instrument delivered pursuant hereto
or in connection herewith.

                                 ARTICLE VIII
                        IOI'S OBLIGATIONS AFTER CLOSING

          8.01 STOCK CERTIFICATES. IOI acknowledges that the number of shares of
Common Stock represented by the IOI stock certificate to be delivered by Merritt
at the Closing will likely exceed the number of the Shares. As such IOI agrees
to use its reasonable efforts to have its transfer agent deliver to Merritt a
certificate representing the balance of the shares of Common Stock owned by
Merritt (the number of shares represented by the certificate delivered by
Merritt at the Closing less the Shares) within fifteen (15) business days after
the Closing.

                                      -5-
<PAGE>
 
                                  ARTICLE IX
                                  TERMINATION

          9.01 MUTUAL CONSENT. This Agreement may be terminated at any time by
the mutual consent of IOI and Merritt.

          9.02 FAILURE TO CLOSE. If Closing has not occurred on or before 
July 31, 1998, this Agreement may be terminated by either party hereto by
written notice to the other party.

                                   ARTICLE X
                                 MISCELLANEOUS

          10.01 EXPENSES. Each of the parties hereto shall bear all expenses
incurred by them in connection with this Agreement and in the consummation of
the transactions provided for herein.

          10.02 SURVIVAL. All representations, warranties, covenants and
agreements of the parties contained in this Agreement shall survive the Closing
and remain effective.

          10.03 SUCCESSORS AND ASSIGNS. This Agreement shall be binding upon and
inure to the benefit of the parties hereto, and their respective successors and
assigns.

          10.04 TEXAS LAW. THIS AGREEMENT SHALL BE CONSTRUED IN ACCORDANCE WITH,
AND GOVERNED BY, THE LAWS OF THE STATE OF TEXAS. THE PARTIES AGREE THAT
JURISDICTION AND VENUE IN ANY ACTION ARISING HEREUNDER SHALL BE IN A COURT OF
COMPETENT JURISDICTION IN HARRIS COUNTY, TEXAS.

          10.05 ENTIRE AGREEMENT. This Agreement constitutes the entire
agreement between the parties hereto, and there are no agreements,
understandings, restrictions, warranties or representations between the parties
other than those set forth herein.

          10.06 COUNTERPARTS. This Agreement may be executed simultaneously in
one or more counterparts, each of which shall be deemed an original, but all of
which together shall constitute one and the same instrument.

                                      -6-
<PAGE>
 
          EXECUTED as of the date first written above.

"IOI"                                    "MERRITT"
                                
INTEGRATED ORTHOPAEDICS, INC.             MERRITT ORTHOPAEDIC ASSOCIATES, P.C.
                                
By: /S/ RONALD E. PIERCE                  By:  /S/ PATRICK J. CAROLAN, M.D.
   _____________________________              _________________________________
   Ronald E. Pierce,  President               Patrick J. Carolan,  M.D.,
                                              President

                                      -7-

<PAGE>
 
                                                                   EXHIBIT 10.28

                                 AMENDMENT TO
                         MANAGEMENT SERVICES AGREEMENT

     This Amendment to the Management Services Agreement (the "Amendment"),
effective as of July 17, 1998, is by and between Integrated Orthopaedics, Inc.,
a Texas corporation ("IOI"), IOI Management Services of Connecticut, Inc., a
Delaware corporation ("Manager"), Merritt Orthopaedic Associates, P.C., a
Connecticut professional corporation ("Existing Practice"), and Patrick J.
Carolan, M.D. and Mark E. Wilchinsky, M.D. ("Shareholders').

                                R E C I T A L S
                                ---------------

     A.   Effective September 22, 1997, Existing Practice and Shareholders
entered into a Management Services Agreement with IOI and Manager.

     B.   On January 1, 1999, Gerard Girasole, M.D., will become a shareholder
of Existing Practice.

     C.   Accordingly, the parties hereto now desire to amend certain terms and
provisions of the Management Services Agreement.

     NOW THEREFORE in consideration of the mutual covenants set forth herein,
and for other good and valuable consideration, the receipt and sufficiency of
which are hereby acknowledged, and intending to be legally bound hereby, the
parties hereto agree as follows:

          1.  Effective January 1, 1999, the definition of "Shareholder" shall
     be amended in Section 9.8. of the Management Services Agreement only, to
     specifically include Gerard Girasole, M.D.

          2.  Gerard Girasole shall neither have nor incur any liability to IOI
     or the Manager under the Management Services Agreement prior to January 1,
     1999 with respect to any representations made therein or to any events
     occurring relative thereto on or before such date.

          3.  Section 11.2 of the Management Services Agreement shall be amended
     to insert a new Section 11.2-2 as follows, and to renumber the subsequent
     existing subsections accordingly:

          11.2-2 RETENTION OF DR. GIRASOLE. The parties recognize Manager would
          not have agreed to the amendment of this Agreement to address Gerard
          Girasole, M.D. ("Girasole") becoming a shareholder in Existing
          Practice effective January 1, 1999 but for Existing Practice's and
          Girasole's agreement to comply with all of the terms and conditions
          relative to such occurrence, including but not limited to maintaining
          the employment agreement as set forth in Exhibit 11.2-2. Accordingly,
          Existing Practice's failure to make Girasole a shareholder effective
          January 1, 1999 or to otherwise comply with the terms of such
          employment agreement or the resolutions 
<PAGE>
 
          of Existing Practice adopted on July 17, 1998, also as set forth in
          Exhibit 11.2-2, shall constitute a breach of a material obligation of
          Existing Practice under this Agreement.

          4.  The introductory clause of Section 13.4 of the Management Services
     Agreement prior to subsections (a), (b) and (c) shall be amended as
     follows:

               To further assure the enhanced value to Existing Practice that is
          intended to be afforded by the services provided by Manager under this
          Agreement, Manager agrees to pay Existing Practice an initial amount
          of Two Hundred Fifty Thousand Dollars ($250,000) on July 17, 1998.
          Thereafter, Manager also agrees to pay an amount equal to:
          _____________.

     EFFECT. This Amendment shall be effective only for the specific purposes
set forth herein, and, except as modified by this Amendment, the terms,
covenants, and provisions of the Management Services Agreement are hereby
ratified and confirmed and shall continue in full force and effect.

     IN WITNESS WHEREOF the parties have executed this Agreement effective as of
the date first written above.

                              INTEGRATED ORTHOPAEDICS, INC.,
                              a Texas corporation


                              By: /s/Ronald E. Pierce
                                  ----------------------------------
                              Name: Ronald E. Pierce
                                    --------------------------------  
                              Title: President & CEO
                                     -------------------------------

                              IOI MANAGEMENT SERVICES OF
                              CONNECTICUT, INC.
                              a Delaware corporation


                              By: /s/Ronald E. Pierce
                                  ----------------------------------
                              Name: Ronald E. Pierce
                                    --------------------------------
                              Title: President & CEO
                                     -------------------------------

                                       2
<PAGE>
 
                              MERRITT ORTHOPAEDIC ASSOCIATES,
                              a Connecticut professional corporation


                              By: /s/Patrick J. Carolan
                                  ----------------------------------
                              Name: Patrick J. Carolan, M.D.
                                  ----------------------------------
                              Title: President
                                  ----------------------------------

                              /s/ Patrick J. Carolan, M.D.
                              -------------------------------------- 
                              PATRICK J. CAROLAN, M.D.

                              
                              /s/ Mark E. Wilchinsky, M.D.
                              --------------------------------------  
                              MARK E. WILCHINSKY, M.D.

                                       3

<PAGE>
 
                                                                   Exhibit 10.29

                          REVOLVING CREDIT AGREEMENT


                                     among


                        INTEGRATED ORTHOPAEDICS, INC.,
                                   BORROWER


                              NATIONSBANK, N.A.,
                             ADMINISTRATIVE AGENT


                                      and


                           THE LENDERS NAMED HEREIN,
                                    LENDERS

                                  $65,000,000

                           DATED AS OF JULY 10, 1998

                                       1
<PAGE>
 
                               TABLE OF CONTENTS
                                                                          Page

SECTION 1 DEFINITIONS AND TERMS                                             7
     1.1   Definitions                                                      7
     1.2   Number and Gender of Words; Other References                    27
     1.3   Accounting Principles                                           28

SECTION 2 BORROWING PROVISIONS                                             28
     2.1   Commitments                                                     28
     2.2   LC Subfacility under Revolver Facility                          28
     2.3   Swing Line Subfacility under Revolver Facility                  33
     2.4   Termination of Commitments                                      34
     2.5   Borrowing Procedure                                             35

SECTION 3 TERMS OF PAYMENT                                                 36
     3.1   Loan Accounts, Notes, and Payments                              36
     3.2   Interest and Principal Payments                                 36
     3.3   Interest Options                                                37
     3.4   Quotation of Rates                                              37
     3.5   Default Rate                                                    38
     3.6   Interest Recapture                                              38
     3.7   Interest Calculations                                           38
     3.8   Maximum Rate                                                    28
     3.9   Interest Periods                                                39
     3.10  Conversions                                                     39
     3.11  Order of Application                                            40
     3.12  Sharing of Payments, Etc                                        41
     3.13  Offset                                                          41
     3.14  Booking Borrowings                                              41

SECTION 4 CHANGE IN CIRCUMSTANCES                                          41
     4.1   Increased Cost and Reduced Return                               43
     4.2   Limitation on Types of Loans                                    43
     4.3   Illegality                                                      43
     4.4   Treatment of Affected Loans                                     43
     4.5   Compensation                                                    44
     4.6   Taxes                                                           44

SECTION 5 FEES                                                             46
     5.1   Treatment of Fees                                               46
     5.2   Fees of Administrative Agent and Arranger                       47
     5.3   LC Fees                                                         47
     5.4   LC Issuance and Fronting Fees                                   47
     5.5   Revolver Facility Commitment Fees                               47

SECTION 6 SECURITY                                                         48
     6.1   Collateral                                                      48
     6.2   Guaranties                                                      49

                                       2
<PAGE>
 
     6.3   Future Liens                                                    49
     6.4   Release of Collateral                                           50
     6.5   Negative Pledge                                                 50
     6.6   IOI Management Services of Pennsylvania, Inc.                   51
     6.7   Control; Limitation of Rights.                                  51

SECTION 7 CONDITIONS PRECEDENT                                             51
     7.1   Conditions Precedent to Closing                                 51
     7.2   Conditions Precedent to a Permitted Acquisition.                51
     7.3   Conditions Precedent to Each Borrowing.                         52
     7.4   Additional Conditions Precedent to Initial Borrowing            52
     7.5   Additional Condition Precedent to Certain Borrowings.           52

SECTION 8 REPRESENTATIONS AND WARRANTIES                                   53
     8.1   Purpose of Credit Facility                                      53
     8.2   Existence, Good Standing, Authority, and Authorizations         53
     8.3   Subsidiaries; Capital Stock                                     54
     8.4   Authorization and Contravention                                 54
     8.5   Binding Effect                                                  55
     8.6   Financial Statements                                            55
     8.7   Litigation, Claims, Investigations                              55
     8.8   Taxes                                                           56
     8.9   Environmental Matters                                           56
     8.10  Employee Benefit Plans                                          56
     8.11  Properties; Liens                                               57
     8.12  Government Regulations                                          57
     8.13  Transactions with Affiliates                                    57
     8.14  Debt                                                            57
     8.15  Material Agreements; Management Agreements                      57
     8.16  Insurance                                                       58
     8.17  Labor Matters                                                   58
     8.18  Solvency                                                        58
     8.19  Intellectual Property                                           58
     8.20  Compliance with Laws                                            58
     8.21  Permitted Acquisitions                                          58
     8.22  Regulation U                                                    59
     8.24  Full Disclosure                                                 59
     8.25  Third Party Reimbursement                                       59
     8.26  Rehabilitation Corporation of America                           59

SECTION 9 COVENANTS                                                        60
     9.1   Use of Proceeds                                                 61
     9.2   Books and Records                                               61
     9.3   Items to be Furnished                                           61
     9.4   Inspections                                                     63
     9.5   Taxes                                                           63
     9.6   Payment of Obligations                                          63
     9.7   Maintenance of Existence, Assets, and Business                  63
     9.8   Insurance                                                       64

                                       3
<PAGE>
 
     9.9   Preservation and Protection of Rights                           64
     9.10  Employee Benefit Plans                                          64
     9.11  Environmental Laws                                              65
     9.12  Accreditation and Licensing                                     65
     9.13  Debt and Guaranties                                             65
     9.14  Liens                                                           66
     9.15  Transactions with Affiliates                                    67
     9.16  Compliance with Laws and Documents                              67
     9.17  Permitted Acquisitions, Subsidiary Guaranties, and Collateral
           Documents                                                       67
     9.18  Assignment                                                      68
     9.19  Fiscal Year and Accounting Methods                              68
     9.20  Government Regulations                                          68
     9.21  Loans, Advances, and Investments                                68
     9.22  Distributions and Restricted Payments                           69
     9.23  Restrictions on Subsidiaries                                    69
     9.24  Sale of Assets                                                  69
     9.25  Sale-Leaseback Financings                                       70
     9.26  Mergers and Dissolutions; Sale of Capital Stock                 70
     9.27  New Business                                                    70
     9.28  [Left Intentionally Blank.]                                     70
     9.29  Amendments to Documents                                         70
     9.30  Financial Covenants                                             71
     9.31  Year 2000                                                       72
     9.32  Rehabilitation Corporation of America                           72

SECTION 10 DEFAULT                                                         72
    10.1   Payment of Obligation                                           72
    10.2   Covenants                                                       73
    10.3   Debtor Relief                                                   73
    10.4   Judgments and Attachments                                       73
    10.5   Government Action                                               73
    10.6   Misrepresentation                                               73
    10.7   Change of Control                                               73
    10.8   Default Under Other Debt and Agreements.                        73
    10.9   Employee Benefit Plans                                          74
    10.10  Validity and Enforceability of Loan Papers                      74
    10.11  Change in Laws                                                  74

SECTION 11 RIGHTS AND REMEDIES                                             75
    11.1   Remedies Upon Default                                           75
    11.2   Company Waivers                                                 75
    11.3   Performance by Administrative Agent                             75
    11.4   Delegation of Duties and Rights                                 76
    11.5   Not in Control                                                  76
    11.6   Course of Dealing                                               76
    11.7   Cumulative Rights                                               77
    11.8   Application of Proceeds                                         77
    11.9   Certain Proceedings                                             77
    11.10  Expenditures by Lenders                                         77
 

                                       4
<PAGE>
 
    11.11 INDEMNIFICATION                                                  77

SECTION 12 AGREEMENT AMONG LENDERS                                         78
    12.1   Administrative Agent                                            78
    12.2   Expenses                                                        80
    12.3   Proportionate Absorption of Losses                              80
    12.4   Delegation of Duties; Reliance                                  80
    12.5   Collateral Matters                                              81
    12.6   Limitation of Liability                                         82
    12.7   Default; Collateral                                             83
    12.8   Limitation of Liability                                         83
    12.9   Relationship of Lenders                                         83
    12.10  Benefits of Agreement                                           83
    12.11  Obligations Several                                             84

SECTION 13 MISCELLANEOUS                                                   84
    13.1   Headings                                                        84
    13.2   Nonbusiness Days                                                84
    13.3   Communications                                                  84
    13.4   Form and Number of Documents                                    85
    13.5   Exceptions to Covenants                                         85
    13.6   Survival                                                        85
    13.7   Governing Law                                                   85
    13.8   Invalid Provisions                                              85
    13.9   Entirety                                                        85
    13.10  Jurisdiction; Venue; Service of Process; Jury Trial             85
    13.11  Amendments, Consents, Conflicts, and Waivers                    86
    13.12  Multiple Counterparts                                           87
    13.13  Successors and Assigns; Assignments and Participations          87
    13.14  Confidentiality.                                                90
    13.15  Chapter 346                                                     90
    13.16  Defaulting Lender                                               90
    13.17  Discharge Only Upon Payment in Full; Reinstatement in Certain
           Circumstances                                                   90

                                       5
<PAGE>
 
            SCHEDULES AND EXHIBITS

Schedule 2.1   -  Lenders and Commitments
Schedule 7.1   -  Conditions Precedent to Closing
Schedule 7.1A  -  Post Closing, Pre-Initial Borrowing Conditions Precedent
Schedule 7.2   -  Requirements for a Permitted Acquisition
Schedule 8.3   -  Subsidiaries
Schedule 8.13  -  Non-Arm's-length Transactions with Affiliates
Schedule 8.15  -  Material Agreements
Schedule 9.13  -  Existing Debt

Exhibit A-1    -  Form of Revolver Note
Exhibit A-2    -  Form of Swing Line Note
Exhibit B-1    -  Form of Notice of Borrowing
Exhibit B-2    -  Form of Notice of Conversion
Exhibit B-3    -  Form of Notice of LC
Exhibit C      -  Form of Guaranty
Exhibit D      -  Form of Pledge, Assignment, and Security Agreement
Exhibit E-1    -  Form of Compliance Certificate
Exhibit E-2    -  Form of Permitted Acquisition Compliance Certificate
Exhibit E-3    -  Form of Permitted Acquisition Loan Closing Certificate
Exhibit F      -  Form of Assignment and Acceptance Agreement
Exhibit G-1    -  Form of Opinion of Counsel of Borrower
Exhibit G-2    -  Form of Opinion of Medical Regulatory Counsel to the Companies
Exhibit G-3    -  Form of Opinion of Local Counsel
Exhibit H      -  Form of Subordination Provisions

                                       6
<PAGE>
 
                          REVOLVING CREDIT AGREEMENT

     THIS REVOLVING CREDIT AGREEMENT is entered into as of July 10, 1998, among
INTEGRATED ORTHOPAEDICS, INC., a Texas corporation ("BORROWER"), Lenders
(hereinafter defined), and NATIONSBANK, N.A., as  Administrative Agent
(hereinafter defined), for itself and the other Lenders.

                                   RECITALS

     A.      Borrower has requested that Lenders extend credit to Borrower in
the form of this Revolving Credit Agreement (the "AGREEMENT"), providing for a
revolving loan facility in the aggregate principal amount of $65,000,000 for
working capital purposes, to finance capital expenditures and acquisitions, and
for other general corporate purposes.

     B.      Upon and subject to the terms and conditions of this Agreement,
Lenders are willing to extend such credit to Borrower.

     Accordingly, in consideration of the mutual covenants contained herein,
Borrower, Administrative Agent, and Lenders agree, as follows:

SECTION 1    DEFINITIONS AND TERMS.

     1.1     DEFINITIONS. As used herein:

     ACQUIRED EBITDA for any Person means for the twelve-month period following
the date of its Acquisition, the amount equal to: (a) the sum of: (i) EBITDA
of such Person for a reporting period of at least the most-recent six
consecutive fiscal months (but not exceeding twelve months) of such Person
preceding the date of its Acquisition, PLUS, (ii) non recurring expenses
mutually agreed upon between Borrower and Administrative Agent, DIVIDED BY (b)
the number of months in the reporting period, MULTIPLIED BY (c) 12, MULTIPLIED
BY (d) the EBITDA Factor.

     If financial information for at least six consecutive fiscal months of any
Person preceding the date of its Acquisition is not readily available, Acquired
EBITDA will be an amount equal to: (a) the SUM OF:  (i) EBITDA for the interim
period available, PLUS (ii) non recurring expenses mutually agreed upon by
Borrower and Administrative Agent, PLUS (b) the amount equal to: (i) the most
recent preceding fiscal year end EBITDA of such Person, DIVIDED BY (ii) 12,
MULTIPLIED BY (iii) 6 minus the number of months in the interim period,
MULTIPLIED BY (c) 2, MULTIPLIED BY (d) the EBITDA Factor.

     For the purposes of the definition of Acquired EBITDA, EBITDA of the
Acquisition Target shall be calculated with reference to EBITDA which would
have been attributable to the Companies by applying the management fee formula
contained in the applicable Service Agreement to the results of such Person's
medical practice or practice management operations for the relevant period.

     ACQUISITION means any transaction or series of related transactions for
the purpose of, or resulting in directly or indirectly, (a) the acquisition by
Borrower or one or more Subsidiaries of the Borrower of all or substantially
all of the assets of a musculoskeletal-related practice or practice group (or
practice management company for such practice or practice group) or clinics or

                                       7
<PAGE>
 
centers providing ancillary services to such practices or practice groups, or
(b) the acquisition by Borrower or one or more Subsidiaries of the Borrower of
all of the outstanding capital stock of any musculoskeletal-related practice or
practice group (or a practice management company for such practice or practice
group) or clinic or center providing ancillary services to such practice or
practice group, including by way of a merger, consolidation, amalgamation, or
other combination if the surviving entity, after giving effect thereto, is a
Company; PROVIDED THAT, in any merger involving Borrower, Borrower must be the
surviving entity, and each acquisition must include the entry of the Borrower
and one or more of its Subsidiaries into one or more Service Agreements with
such practice, practice group, clinic or center or successor thereto.

     ACQUISITION AGREEMENT shall mean, collectively, each asset purchase
agreement, stock purchase agreement, or plan of merger or consolidation for the
Acquisition of a musculoskeletal-related practice or practice group (or a
practice management company for such practice or practice group) or clinics or
centers providing ancillary services to such practices or practice groups if a
Company is the surviving entity or if after giving effect thereto, the
surviving entity is a Company, and any Service Agreement to be executed in
connection therewith.

     ACQUISITION TARGET means a Person that is a musculoskeletal-related
practice or practice group (or a practice management company for such practice
or practice group) or clinic or center providing services ancillary to such
practice or practice group which Borrower or any Company intends to make the
subject of an Acquisition.

     ADJUSTED EURODOLLAR RATE means, for any Eurodollar Rate Borrowing for any
Interest Period therefor, the rate per annum (rounded upwards, if necessary, to
the nearest 1/100 of 1%) determined by the Administrative Agent to be equal to
the quotient obtained by dividing (a) the Eurodollar Rate for such Eurodollar
Rate Borrowing for such Interest Period by (b) 1 MINUS the Reserve Requirement
for such Eurodollar Rate Borrowing for such Interest Period.

     ADMINISTRATIVE AGENT means NationsBank, N.A., and its permitted successors
or assigns as "ADMINISTRATIVE AGENT" for Lenders under this Agreement.

     AFFILIATE of any Person means

     (a)  each Person that, directly or indirectly owns or controls, whether
          beneficially, or as a trustee, guardian, or other fiduciary, five
          percent (5%) or more of the Voting Stock of such Person,

     (b)  each Person who directly or indirectly controls, or is controlled by,
          or is under common control with, such Person, and

     (c)  each of such Person's officers, directors, joint venturers, and
          partners.

For purposes of this definition only, "CONTROL," "CONTROLLED BY," and "UNDER 
COMMON CONTROL WITH" mean possession, directly or indirectly, of the power to 
direct or cause the direction of management or policies (whether through 
ownership of voting securities, by contract, or otherwise), PROVIDED HOWEVER, 
that the term "AFFILIATE" shall specifically exclude Administrative Agent and 

                                       8
<PAGE>
 
Lenders.

     AGENT means the Administrative Agent.

     AGREEMENT means this Revolving Credit Agreement (as the same may hereafter
be amended, modified, supplemented, or restated from time to time).

     APPLICABLE LENDING OFFICE means, for each Lender and for each Type of
Borrowing, the "LENDING OFFICE" of such Lender (or an affiliate of such Lender)
designated on SCHEDULE 2.1 attached hereto or such other office that such
Lender (or an affiliate of such Lender) may from time to time specify to
Administrative Agent and Borrower by written notice in accordance with the
terms hereof.

     APPLICABLE MARGIN means, on any date of determination, with respect to
each Base Rate Borrowing, or Eurodollar Rate Borrowing, respectively, the
percentage per annum set forth in the appropriate column below that corresponds
to the Total Debt to Pro Forma EBITDA Ratio at such date of determination, as
calculated based on the quarterly compliance certificate of Borrower most
recently delivered pursuant to SECTION 9.3 hereof, or if delivered later, the
most recent Permitted Acquisition Compliance Certificate for a Permitted
Acquisition:

<TABLE>
<CAPTION>
   TOTAL DEBT TO PRO FORMA        APPLICABLE MARGIN
         EBITDA RATIO
<S>                             <C>          <C>
                                 BASE RATE    EURODOLLAR RATE
                                BORROWINGS       BORROWINGS

Less than or equal to 1.5:1.0     0.000%           1.000%
Less than or equal to 2.0 to     
1.0, but greater than 1.5:1.0     0.000%           1.250%
Less than or equal to 2.5:1.0,
but greater than 2.0:1.0          0.000%           1.500%
Less than or equal to 3.0:1.0,
but greater than 2.5:1.0          0.000%           1.750%
Less than or equal to 4.0:1.0,
but greater than 3.0:1.0           .250%           2.000%
Greater than 4.0:1.0               .500%           2.250%
</TABLE>

          (a) Until the second Business Day after the initial Financial
     Statements and Compliance Certificate for the fiscal quarter ending
     September 30, 1998, shall have been delivered hereunder, the Applicable
     Margin for Base Rate Borrowings shall be not less than 0.000% and for
     Eurodollar Rate Borrowings shall be not less than 1.750%. With respect to
     any adjustments in the Applicable Margin as a result of changes in the
     Total Debt to Pro Forma EBITDA Ratio, such adjustment shall be effective
     commencing on the second Business Day after the delivery of Financial
     Statements (and related Compliance Certificate) pursuant to SECTIONS 9.3(A)
     and 9.3(B) or the most recent Permitted Acquisition Compliance Certificate
     for a Permitted Acquisition, as the case may be.

                                       9
<PAGE>
 
          (b) If Borrower fails to timely furnish to Lenders the Financial
     Statements and related Compliance Certificates as required to be delivered
     pursuant to SECTIONS 9.3(A) and 9.3(B), then the Applicable Margin shall be
     the maximum Applicable Margin specified in the Table above.

     APPLICABLE MARGIN FOR COMMITMENT FEES means, on any date of determination,
the percentage set forth in the table below which corresponds, on any date of
determination, with the Total Debt to Pro Forma EBITDA Ratio at such date of
determination, as calculated based on the quarterly compliance certificates of
Borrower most recently delivered pursuant to SECTION 9.3 hereof, or if
delivered later, the most recent Permitted Acquisition Compliance Certificate
for a Permitted Acquisition.

<TABLE>
<CAPTION>
TOTAL DEBT TO PRO FORMA EBITDA     APPLICABLE
    RATIO REQUIREMENT              MARGIN FOR
                                 COMMITMENT FEES
<S>                              <C>
Less than or equal to 2.5:1.0        0.250%
Less than or equal to 3.0 to
1.0 but greater than 2.5:1.0         0.300%
Less than or equal to 4.0:1.0
but greater than 3.0:1.0             0.375%
Greater than 4:0:1.0                 0.500%
</TABLE>

          (a) Until the second Business Day after the initial Financial
     Statements and Compliance Certificate for the fiscal quarter ending
     September 30, 1998, shall have been delivered hereunder, the Applicable
     Margin for Commitment Fees shall be .300%. With respect to any adjustments
     in the Applicable Margin for Commitment Fees as a result of changes in the
     Total Debt to Pro Forma EBITDA Ratio, such adjustment shall be effective
     commencing on the second Business Day after the delivery of Financial
     Statements (and related Compliance Certificate) pursuant to SECTIONS 9.3(A)
     and 9.3(B) or the most recent Permitted Acquisition Compliance Certificate
     for a Permitted Acquisition, as the case may be.

          (b) If Borrower fails to timely furnish to Lenders the Financial
     Statements and related Compliance Certificates as required to be delivered
     pursuant to SECTIONS 9.3(A) and 9.3(B), then the Applicable Margin for
     Commitment Fees shall be the maximum Applicable Margin specified in the
     table above.

     AUTHORIZATIONS means all filings, recordings, and registrations with, and
all validations or exemptions, approvals, orders, authorizations, consents,
franchises, licenses, certificates, and permits from, any Governmental
Authority, including without limitation, any of the foregoing authorizing or
permitting the acquisition, construction, or operation of any Managed Practice.

     BASE RATE means, for any day, the rate per annum equal to the HIGHER of
(a) the Federal Funds Rate for such day PLUS one-half of one percent (.5%) and
(b) the Prime Rate for such day. Any change in the Base Rate due to a change
in the Prime Rate or the Federal Funds Rate shall be effective on the effective

                                       10
<PAGE>
 
date of such change in the Prime Rate or the Federal Funds Rate.

     BASE RATE BORROWING means a Borrowing bearing interest at the SUM of the
Base Rate PLUS the Applicable Margin for Base Rate Borrowings.

     BLUE CROSS/BLUE SHIELD shall mean any and all contracts or agreements in
force between any of the Borrower, any Subsidiary or any Managed Practice and
any Blue Cross/Blue Shield plan.

     BORROWER is defined in the preamble to this Agreement.

     BORROWING means any amount disbursed (a) by one or more Lenders to
Borrower under the Loan Papers (under the LC Subfacility, the Swing Line
Facility, or  otherwise),  whether such amount constitutes an original
disbursement of funds, the continuation of an amount outstanding, or payment of
a draft under an LC, or (b) by any Lender in accordance with, and to satisfy
the obligations of any Company or any Guarantor under, any Loan Paper.

     BORROWING DATE is defined in SECTION 2.5(A).

     BUSINESS DAY means (a) for all purposes, any day OTHER THAN Saturday,
Sunday, and any other day on which commercial banking institutions are required
or authorized by Law to be closed in New York, New York, and (b) in addition to
the foregoing, in respect of any Eurodollar Rate Borrowing, a day on which
dealings in United States dollars are conducted in the London interbank market
and commercial banks are open for international business in London.

     CAPITAL EXPENDITURES means an expenditure for any fixed asset having a
useful life of more than one (1) year, or any improvements or additions
thereto, including the direct or indirect acquisition of such assets, but
excluding all fixed assets financed under a Capital Lease; PROVIDED, HOWEVER,
that Capital Expenditures shall not include acquisitions of stock or assets
which are made in accordance with the definition of Permitted Acquisition.

     CAPITALIZATION means, as of any date, the sum of (a) the consolidated
Total Funded Debt of Borrower and its Subsidiaries calculated in accordance
with GAAP, PLUS (b) Consolidated Net Worth.

     CAPITAL LEASE means any capital lease or sublease which should be
capitalized on a balance sheet in accordance with GAAP.

     CHAMPUS shall mean, collectively, the Civilian Health and Medical Program
of the Uniformed Service, a program of medical benefits covering former and
active members of the uniformed services and certain of their dependents,
financed and administered by the United States Departments of Defense, Health
and Human Services and Transportation, and all laws, rules, regulations,
manuals,  orders, guidelines or requirements pertaining to such program
including (a)  all  federal  statutes (whether set forth in 10 U.S.C.
<section><section>1071-1106 or elsewhere) affecting such program; and (b) all
rules, regulations (including 32 C.F.R. <section>199), manuals, orders and
administrative, reimbursement  and  other guidelines of all governmental
authorities promulgated in connection with such program (whether or not having
the force of law), in each case as the same may be amended, supplemented or
otherwise modified from time to time.

                                       11
<PAGE>
 
     CHAMPVA shall mean, collectively, the Civilian Health and Medical Program
of the Department of Veteran Affairs, a program of medical benefits covering
retirees and dependents of former members of the armed services administered by
the United States Department of Veteran Affairs, and all laws, rules,
regulations, manuals, orders, guidelines or requirements pertaining to such
program including (a) all federal statutes (whether set forth in 38 U.S.C.
<section>1713 or elsewhere) affecting such program or, to the extent applicable
to CHAMPVA; and (b) all rules, regulations (including 38 C.F.R. <section>17.54),
manuals, orders and administrative, reimbursement and other guidelines of all
governmental authorities promulgated in connection with such program (whether or
not having the force of law), in each case as the same may be amended,
supplemented or otherwise modified from time to time.

     CHANGE OF CONTROL means any of the following: (a) any person or group
of persons (within the meaning of the Securities Exchange Act of 1934, as
amended), other than the Investors, shall have acquired beneficial ownership
(within the meaning of Rule 13d-3 promulgated by the Securities and Exchange
Commission under the Securities Exchange Act of 1934, as amended) of 30% or
more of the issued and outstanding shares of Voting Stock of Borrower; (b) at
any time, individuals who at the Closing Date, or if later, the date two years
prior to the date of determination (the Closing Date or such later date, the
"BASELINE DATE"), constituted 50% or more of the board of directors of Borrower
(together with any new directors whose election by the board of directors of
Borrower or whose nomination for election by the stockholders of Borrower was
approved either by the Investors or by a vote of at least two-thirds of the
directors then still in office who either were directors on the Baseline Date
or whose elections or nomination for election was previously so approved) cease
for any reason other than death or disability to constitute a majority of the
directors then in office; (c) Borrower sells, transfers, conveys, assigns or
otherwise disposes of all or substantially all of its assets; or (d) the
Investors cease in the aggregate to own at least 20% of the issued and
outstanding shares of stock of Borrower having the right to vote for the
election of directors of Borrower under ordinary circumstances.

     CLOSING DATE means the date upon which this Agreement has been executed
by Borrower, Lenders, and Administrative Agent and all conditions precedent
specified in SECTION 7.1 have been satisfied or waived.

     CODE means the INTERNAL REVENUE CODE OF 1986, as amended, TOGETHER WITH
the rules and regulations promulgated thereunder.

     COLLATERAL has the meaning set forth in SECTION 6.1.

     COLLATERAL DOCUMENTS means all security agreements, pledge agreements,
assignments of partnership interests, and Guaranties at any time delivered to
Administrative Agent to create or evidence Liens securing the Obligation,
together with all reaffirmations, amendments, and modifications thereof or
supplements thereto.

     COLLATERAL LETTER OF CREDIT means a letter of credit which is: (a) an
irrevocable standby letter of credit issued in favor of Administrative Agent by
a financial institution acceptable to Administrative Agent, which secures
payment of the LC Exposure and may be drawn upon the drawing of any LC issued
hereunder which remains unreimbursed for one Business Day; (b) which is in the

                                       12
<PAGE>
 
form and substance reasonably satisfactory to Administrative Agent; (c) whose
expiry date is 30 Business Days following the latest expiry date of any LC
issued hereunder; (d) which shall be freely assignable and transferable,
subject to payment of customary fees; (e) which shall provide for partial draws
thereunder; and (f) shall be in the face amount equal to at least 105% of the
LC Exposure existing on the date it is delivered.

     COMMITTED SUM shall mean (a) as to any Lender, such Lender's Revolver
Commitment (including without duplication the Swing Line Lender's Swing Line
Commitment) as set forth on the signature page to the Agreement or in the most
recent Assignment Agreement executed by such Lender and (b) as to all Lenders,
all Lenders' Revolver Commitments (including without duplication the Swing Line
Lender's Swing Line Commitment) which aggregate commitment shall be Sixty-Five
Million Dollars ($65,000,000.00) on the Closing Date, as such amount may be
adjusted, if at all, from time to time in accordance with the Agreement.

     COMPANIES means, at any date of determination thereof, Borrower and
each of its Subsidiaries; and COMPANY means, on any date of determination,
Borrower or any of its Subsidiaries.

     COMPLIANCE CERTIFICATE means a certificate signed by a Responsible
Officer, substantially in the form of EXHIBIT E-1.

     CONSEQUENTIAL LOSS means any loss or expense which any Lender may
reasonably incur in respect of a Eurodollar Rate Borrowing as a consequence of
any event described in SECTION 4.5.

     CONSOLIDATED NET WORTH means, at any time, all amounts, which in
conformity with GAAP, would be included in stockholders' equity  on a
consolidated balance sheet of Borrower.

     CURRENT FINANCIALS means, at the time of any determination thereof, the
more recently delivered to Lenders of either (a) the Financial Statements for
the fiscal year ended December 31, 1997, and the three-month period ended
March 31, 1998, calculated on a consolidated basis for the Companies; or (b) the
Financial Statements required to be delivered under SECTIONS 9.3(A) or 9.3(B),
as the case may be, calculated on a consolidated basis for the Companies.

     DEBT means (without duplication), for any Person, the sum of the
following: (a) all liabilities, obligations, and indebtedness of such Person
which in accordance with GAAP should be classified upon such Person's balance
sheet as liabilities in respect of (i) money borrowed, including, without
limitation, the Revolver Principal Debt, (ii) obligations of such Person under
Capital Leases, and (iii) obligations of such Person issued or assumed as the
deferred purchase price of property, all conditional sale obligations, and
obligations under any title retention agreement (but excluding trade accounts
payable arising in the ordinary course of business); (b) all obligations of the
type referred to in CLAUSES (A)(I) through (A)(III) preceding of other Persons
for the payment of which such Person is responsible or liable as obligor,
guarantor, or otherwise; (c) all obligations of the type referred to in
CLAUSES (A)(I) through CLAUSE (A)(III) and CLAUSE (B) preceding of other
Persons secured by any Lien on any property or asset of such Person (whether or
not such obligation is assumed by such Person), the amount of such obligation
being deemed to be the lesser of the value of such property or assets or the

                                       13
<PAGE>
 
amount of the obligation so secured; (d) the face amount of all letters of
credit and banker's acceptances issued for the account of such Person, and
without duplication, all drafts drawn and unpaid thereunder; and (e) net
payments under Financial Hedges.

     DEBTOR RELIEF LAWS means the BANKRUPTCY CODE OF THE UNITED STATES OF
AMERICA and all other applicable liquidation, conservatorship, bankruptcy,
moratorium, rearrangement, receivership, insolvency, reorganization, fraudulent
transfer or conveyance, suspension of payments, or similar Laws from time to
time in effect affecting the Rights of creditors generally.

     DEFAULT is defined in SECTION 10.

     DEFAULT RATE with respect to Base Rate Borrowings means a per annum
rate of interest equal from day to day to the LESSER of (a) the SUM of the Base
Rate PLUS the Applicable Margin for Base Rate Borrowings PLUS 2% AND (b) the
Maximum Rate, and with respect to Eurodollar Rate Borrowings means a per annum
rate of interest equal from day to day to the LESSER OF (a) the SUM of the
Eurodollar Rate PLUS the Applicable Margin for Eurodollar Rate Borrowings, PLUS
2% and (b) the Maximum Rate.

     "DEFAULTING LENDER" means, at any time, any Lender that, (a) has failed
to advance a Borrowing or purchase a participation interest when required
pursuant to the terms of this Agreement (but only for so long as such Borrowing
is not made or such participation interest is not purchased), (b) has failed to
pay to Agent or any Lender an amount owed by such Lender pursuant to the terms
of this Agreement (but only for so long as such amount has not been repaid) or
(c) has been deemed insolvent or has become subject to a bankruptcy or
insolvency proceeding or to a receiver, trustee or similar official.

     DISTRIBUTION for any Person means, with respect to any shares of any
capital stock or other equity securities issued by such Person, (a) the
retirement, redemption, purchase, or other acquisition for value of any such
securities, (b) the declaration or payment of any dividend on or with respect
to any such securities, and (c) any other payment by such Person with respect
to such securities.

     DIVESTED EBITDA means, as calculated at any date of determination with
respect to the most recently ended twelve fiscal months, the GAAP LTM EBITDA
and Acquired EBITDA, as applicable, attributable to any Subsidiary whose stock
or all or substantially all of whose assets have been sold or otherwise
disposed of or any Service Agreement which has been terminated (without being
contemporaneously replaced by a new Service Agreement with the same Managed
Practice that provides substantially the same or more EBITDA to Borrower and
its Subsidiaries as the terminated Service Agreement), PROVIDED THAT only the
difference between the EBITDA provided to Borrower and its Subsidiaries by the
original Service Agreement MINUS the EBITDA provided to Borrower and its
Subsidiaries by the replacement Service Agreement shall be Divested EBITDA.

     DOLLARS and the symbol $ means lawful money of the United States of
America.

     EBITDA means for any Person as calculated at any date of determination
with respect to the most recently ended twelve fiscal months the SUM (without

                                       14
<PAGE>
 
duplication) of (a) consolidated net income, determined in accordance with
GAAP, PLUS to the extent already deducted in computing net income, (b) income
taxes, (c) Interest Expense,  (d)  depreciation and amortization, MINUS
(e) extraordinary income, MINUS (f) interest income.

     EBITDA ADJUSTMENT means $1,357,000.

     EBITDA FACTOR means for any Person, the QUOTIENT of (a) 12 MINUS the
number of months since the date of any Acquisition, DIVIDED BY (b) 12.

     EBITDAR means with respect to any Person for any fiscal period, the SUM
of EBITDA PLUS Rental Expense.

     ELIGIBLE ASSIGNEE means (a) a Lender; (b) an Affiliate of a Lender; and
(c) any other Person approved by Administrative Agent (which approval will not
be unreasonably withheld or delayed by Administrative Agent) and, unless a
Default or Potential Default has occurred and is continuing at the time any
assignment is effected in accordance with SECTION 13.13, Borrower, such
approval not to be unreasonably withheld or delayed by Borrower and such
approval to be deemed given by Borrower if no objection is received by the
assigning Lender and the Administrative Agent from Borrower within five
Business Days after notice of such proposed assignment has been provided by the
assigning Lender to Borrower; PROVIDED, HOWEVER, that neither Borrower nor any
Affiliate of Borrower shall qualify as an Eligible Assignee.

     EMPLOYEE PLAN means an employee pension benefit plan covered by
TITLE IV of ERISA and established or maintained by Borrower or any ERISA
Affiliate, but not including any Multiemployer Plan.

     ENVIRONMENTAL LAW means any applicable Law that relates to the
condition or protection of air, groundwater, surface water, soil, or other
environmental media, including natural resources or the regulation of any
pollutants, contaminants, wastes, substances, including, without limitation,
the Comprehensive Environmental Response, Compensation, and Liability Act (42
U.S.C. <section> 9601 ET SEQ.) ("CERCLA"), the Clean Air Act (42 U.S.C.
<section> 7401 ET SEQ.), the Federal Water Pollution Control Act, as amended by
the Clean Water Act (33 U.S.C. <section> 1251 ET SEQ.),  the Federal
Insecticide, Fungicide, and Rodenticide Act (7 U.S.C. <section> 136 ET SEQ.),
the Emergency Planning and Community Right to Know Act of 1986 (42 U.S.C.
<section> 11001 ET SEQ.), the Hazardous Materials Transportation Act (49 U.S.C.
<section> 1801 ET SEQ.), the National Environmental Policy Act of 1969
(42 U.S.C. <section> 4321 ET SEQ.), the Oil Pollution Act (33 U.S.C. <section>
2701 ET SEQ.), the Resource Conservation  and Recovery Act (42 U.S.C.
<section> 6901 ET SEQ.), the Rivers and Harbors Act (33 U.S.C. <section> 401 ET
SEQ.), the Safe Drinking Water Act (42 U.S.C. <section> 201 and <section> 300f
ET SEQ.), the Solid Waste Disposal Act, as amended by the Resource Conservation
and Recovery Act of 1976 and the Hazardous and Solid Waste Amendments of 1984
(42 U.S.C. <section> 6901 ET SEQ.), the Toxic Substances Control Act (15 U.S.C.
<section> 2601 ET SEQ.), and analogous state and local Laws, as any of the
foregoing may have been and may be amended or supplemented from time to time,
and any analogous future enacted or adopted Law, but only to the extent
actually applicable.

     EQUITY ISSUANCE means the issuance on and after the Closing Date by any

                                       15
<PAGE>
 
Company of any shares of any class of stock, warrants, or other equity
interests, other than present and future shares of stock, options, or warrants
issued to employees, directors, or consultants of the Companies, or stock
issued upon their exercise.

     ERISA means the EMPLOYEE RETIREMENT INCOME SECURITY ACT OF 1974, as
amended, and the regulations and rulings thereunder.

     ERISA AFFILIATE means any company or trade or business (whether or not
incorporated) which, for purposes of TITLE IV of ERISA, is a member of
Borrower's controlled group or which is under common control with Borrower
within the meaning of SECTION 414(B), (C), (M), or (O) of the Code.

     EURODOLLAR RATE means, for any Eurodollar Rate Borrowing for any
Interest Period therefor, the rate per annum (rounded upwards, if necessary, to
the nearest 1/100 of 1%) appearing on Dow Jones Markets Page 3750 (or any
successor page) as the London interbank offered rate for deposits in Dollars at
approximately 11:00 a.m. (London time) two Business Days prior to the first day
of such Interest Period for a term comparable to such Interest Period.  If for
any reason such rate is not available, the term "EURODOLLAR RATE" shall mean,
for any Eurodollar Rate Borrowing for any Interest Period therefor, the rate
per annum (rounded upwards, if necessary, to the nearest 1/100 of 1%) appearing
on Reuters Screen LIBO Page as the London interbank offered rate for deposits
in Dollars at approximately 11:00 a.m. (London time) two Business Days prior to
the first day of such Interest Period for a term comparable to such Interest
Period; PROVIDED, HOWEVER, if more than one rate is specified on Reuters Screen
LIBO Page, the applicable rate shall be the arithmetic mean of all such rates
(rounded upwards, if necessary, to the nearest 1/100 of 1%).

     EURODOLLAR RATE BORROWING means a Borrowing bearing interest at the SUM
of the Adjusted Eurodollar Rate PLUS the Applicable Margin for Eurodollar Rate
Borrowings.

     EXHIBIT means an exhibit to this Agreement unless otherwise specified.

     FEDERAL FUNDS RATE means, for any day, the rate per annum (rounded
upwards, if necessary, to the nearest 1/100  of 1%) determined (which
determination shall be conclusive and binding, absent manifest error) by
Administrative Agent to be equal to the weighted average of the rates on
overnight Federal funds transactions with member banks of the Federal Reserve
System arranged by Federal funds brokers on such day, as published by the
Federal Reserve Bank of New York on the Business Day next succeeding such day;
PROVIDED THAT (a) if such day is not a Business Day, the Federal Funds Rate for
such day shall be such rate on such transactions on the next preceding Business
Day as so published on the next succeeding Business Day, and (b) if no such
rate is so published on such next succeeding Business Day, the Federal Funds
Rate for such day shall be the average rate charged to the Administrative Agent
(in its individual capacity) on such day on such transactions as determined by
the Administrative Agent (which determination shall be conclusive and binding,
absent manifest error).

     FINANCIAL HEDGE means a swap, collar, floor, cap, or other contract
which is intended to reduce or eliminate the risk of fluctuations in interest
rates, which Financial Hedge is entered into by any Company with a Lender or an

                                       16
<PAGE>
 
Affiliate of a Lender.

     FINANCIAL STATEMENTS means balance sheets, statements of operations,
statements of shareholders' equity, and statements of cash flows prepared in
accordance with GAAP, which statements of operations and statements of cash
flows shall be in comparative form to the corresponding period of the preceding
fiscal year, and which balance sheets and statements of shareholders' equity
shall be in comparative form to the prior fiscal year-end figures.

     FISCAL YEAR means the twelve month period ending December 31 of each
calendar year.

     GAAP means generally accepted accounting principles of the Accounting
Principles Board of the American Institute of Certified Public Accountants and
the Financial Accounting Standards Board which are applicable from time to
time.

     GAAP LTM EBITDA means, for any Person, as calculated at any date of
determination with respect to the most recently ended twelve fiscal months the
SUM (without duplication) of:  (a) consolidated net income, determined in
accordance with GAAP, PLUS to the extent already deducted in computing net
income, (b) income  taxes,  (c) Interest Expense, (d) depreciation and
amortization, MINUS (e) extraordinary income, MINUS (f) interest income. In
determining GAAP LTM EBITDA, for each month in fiscal year 1997 included in the
calculation, GAAP LTM EBITDA shall be the quotient of:  (x) the SUM of (q) the
actual audited EBITDA for Fiscal Year 1997; PLUS (r) the EBITDA Adjustment
(y) DIVIDED by 12.

     GOVERNMENTAL AUTHORITY means any (a) local, state, municipal, or
federal judicial, executive, or legislative instrumentality, (b) private
arbitration board or panel, or (c) central bank.

     GUARANTOR means any Person, including, but not limited to, any
Subsidiary of Borrower, who undertakes to be liable for all or any part of the
Obligation by execution of a Guaranty or otherwise.

     GUARANTY means (a) a Guaranty in substantially the form and upon the
terms of EXHIBIT C, executed and delivered by any Person pursuant to the
requirements of the Loan Papers; and (b) any amendments, modifications,
supplements, restatements, ratifications, or reaffirmations of any Guaranty
made in accordance with the Loan Papers.

     HAZARDOUS SUBSTANCE means (a) any substance that is designated,
defined, or classified as a hazardous waste, hazardous material, pollutant,
contaminant, or toxic or hazardous substance under any Environmental Law,
including without limitation, any hazardous substance within the meaning of
SECTION  101(14) of CERCLA, (b) petroleum, oil, gasoline, natural gas, fuel
oil, motor oil, waste oil, diesel fuel, jet fuel, and other petroleum
hydrocarbons, (c) regulated asbestos and asbestos-containing materials in a
friable form, (d) polychlorinated biphenyls, or (e) urea formaldehyde foam.

     HCFA means the Health Care Financing Administration, an agency of HHS,
and any successor thereto.

                                       17
<PAGE>
 
     HEALTHCARE LAWS means collectively, any and all federal, state or local
laws, rules, regulations,  manuals,  orders, guidelines and requirements
pertaining to the delivery of services by the Managed Practices or to the
practice of medicine thereby, including without limitation all laws, rules,
regulations, manuals, orders, guidelines  and requirements pertaining to
CHAMPUS, CHAMPVA, Medicaid or Medicare.

     HHS means the Department of Health and Human Services.

     INITIAL BORROWING means the earlier of: (a) the first Borrowing made
hereunder, or (b) the first LC issued hereunder.

     INITIALLY UNPERFECTED ASSETS shall have the meaning given such term in
SECTION 6.3.

     INTEREST EXPENSE means, for any period of calculation thereof, for any
Person, the aggregate amount of all interest (including commitment fees) on all
Debt of such Person, whether paid in cash or accrued as a liability and payable
in cash during such period (including, without limitation, imputed interest on
Capital Lease obligations; the amortization of any original issue discount on
any Debt; the interest portion of any deferred payment obligation; all
commissions, discounts, and other fees and charges owed with respect to letters
of credit or bankers' acceptance financing; net costs associated with Financial
Hedges; the interest component of any Debt that is guaranteed or secured by
such Person), and all cash premiums or penalties for the repayment, redemption,
or repurchase of Debt.

     INTEREST PERIOD is determined in accordance with SECTION 3.9.

     INVESTORS  means  collectively,  Keystone,  Inc.,  FW  Integrated
Orthopaedics Investors, L.P., FW Integrated Orthopaedics Investors II, L.P.,
and their respective Affiliates, and INVESTOR means any of them.

     LAWS means all applicable statutes, laws, treaties, ordinances, tariff
requirements,  rules,  regulations, orders, writs, injunctions,  decrees,
judgments, opinions, or interpretations of any Governmental Authority having
jurisdiction over the Borrower and the specific operations at issue.

     LC means the letter(s) of credit issued hereunder in the form agreed
upon among Borrower, Administrative Agent, and the beneficiary thereof at the
time of issuance thereof and participated in by Lenders pursuant to the terms
and conditions of SECTION 2.2 hereof.

     LC AGREEMENT means a letter of credit application and agreement (in
form and substance satisfactory to Administrative Agent) submitted by Borrower
to Administrative Agent for an LC for its own account (and for its benefit or
the benefit of any other Company); PROVIDED THAT this Agreement shall control
any conflict between this Agreement and any such LC Agreement.

     LC EXPOSURE means, at any time and without duplication, the SUM of
(a) the aggregate undrawn portion of all uncancelled and unexpired LCs PLUS (b)
the aggregate unpaid reimbursement obligations of Borrower in respect of
drawings of drafts under any LC.

                                       18
<PAGE>
 
     LC SUBFACILITY means a subfacility for the issuance of LCs (the LC
Exposure in connection with which may never exceed $5,000,000), as described in
and subject to the limitations of SECTION 2.2.

     LENDERS means, on any date of determination, the financial institutions
named on SCHEDULE 2.1 (as the same may be amended from time to time by
Administrative Agent to reflect the assignments made in accordance with
SECTION 13.13(C) of this Agreement), and subject to the terms and conditions of
this Agreement, and their respective successors and assigns.

     LIEN means any lien, mortgage, security interest, pledge, assignment,
charge, title retention agreement, or encumbrance of any kind, and any other
Right of or arrangement with any creditor (other than under or relating to
subordination or other intercreditor arrangements) to have its claim satisfied
out of any property or assets, or the proceeds therefrom, prior to the general
creditors of the owner thereof.

     LITIGATION means any action by or before any Governmental Authority.

     LOAN PAPERS means (a) this Agreement, the Notes, the Collateral
Documents, LCs and LC Agreements, (b) all agreements, documents, or instruments
in favor of Agents or Lenders ever delivered pursuant to this Agreement or
otherwise delivered in connection with all or any part of the Obligation,
(c) any Financial Hedge between any Company or Guarantor and any Lender or any
Affiliate of any Lender, and (d) any and all future renewals, extensions,
restatements, reaffirmations, or amendments of, or supplements to, all or any
part of the foregoing.

     MANAGED  PRACTICE  means  any orthopedic physician,  professional
corporation, professional association, partnership or similar Person that,
pursuant to a Service Agreement, provides musculoskeletal related professional
medical services at a medical office, clinic or other facility operated by the
Borrower or any of Borrower's Subsidiaries, or at a hospital or hospital
department with which the Borrower or any Subsidiary has a service contract.

     MANAGED PRACTICE LOANS means loans or advances by Borrower or any of
its Subsidiaries to any Managed Practice made in the ordinary course of
business to finance the costs associated with the addition of physicians to
such Managed Practice or other expenditures of such Managed Practice pursuant
to specified incentive loan programs established and approved by the board of
directors of the Company (or a duly authorized committee thereof) from time to
time.

     MATERIAL ADVERSE EVENT means any set of one or more circumstances or
events which, individually or collectively, would reasonably be expected to
result in any (a) material impairment of the ability of any Company or any
Guarantor to perform any of its payment or other material obligations under the
Loan Papers or the ability of Administrative Agent or any Lender to enforce any
such obligations or any of their respective Rights under the Loan Papers,
(b) material and adverse effect on the business, properties, condition
(financial or otherwise) or results of operations of the Companies taken as a
whole, or (c) Default or Potential Default.

     MAXIMUM AMOUNT and MAXIMUM RATE respectively mean, for each Lender, the

                                       19
<PAGE>
 
maximum non-usurious amount and the maximum non-usurious rate of interest
which, under applicable Law, such Lender is permitted to contract for, charge,
take, reserve, or receive on the Obligation.

     MAXIMUM WORKING CAPITAL COMMITMENT means an amount (subject to
reduction or cancellation as herein provided) equal to $15,000,000.

     MEDICAID shall mean, collectively, the health care assistance program
established by Title  XIX  of  the  Social  Security  Act  (42 U.S.C.
<section><section>1396 ET SEQ.) and any statutes succeeding thereto, and all
laws, rules, regulations,  manuals,  orders,  guidelines or requirements
pertaining to such program including (a) all federal statutes (whether set
forth in Title XIX of the Social Security Act or elsewhere) affecting such
program; (b) all state statutes and plans for medical assistance enacted in
connection with such program and federal rules and regulations promulgated in
connection with such program; and (c) all applicable provisions of all rules,
regulations, manuals, orders and administrative, reimbursement, guidelines and
requirements of all government authorities promulgated in connection with such
program (whether or not having the force of law), in each case as the same may
be amended, supplemented or otherwise modified from time to time.

     MEDICARE shall mean, collectively, the health insurance program for the
aged and disabled established by Title XVIII of the Social Security Act (42
U.S.C. <section><section>1395 ET SEQ.) and any statutes succeeding thereto, and
all laws, rules, regulations, manuals, orders or guidelines pertaining to such
program including (a) all federal statutes (whether set forth in Title XVIII of
the Social Security Act or elsewhere) affecting such program; and (b) all
applicable provisions of all rules, regulations, manuals,  orders  and
administrative, reimbursement, guidelines and requirements of all governmental
authorities promulgated in connected with such program (whether or not having
the force of law), in each case as the same may be amended, supplemented or
otherwise modified from time to time.

     MULTIEMPLOYER PLAN means a multiemployer  plan  as  defined  in
SECTIONS 3(37) or 4001(A)(3) of ERISA or SECTION 414(F) of the Code to which
any Company or any ERISA Affiliate is making, or has made, or is accruing, or
has accrued, an obligation to make contributions.

     NATIONSBANK means NationsBank, N.A., in its individual capacity as a
Lender, and its successors and assigns.

     NOTES means, at the time of any determination thereof, all outstanding
and unpaid Revolver Notes and Swing Line Note.

     NOTICE OF BORROWING is defined in SECTION 2.5(A).

     NOTICE OF CONVERSION is defined in SECTION 3.10.

     NOTICE OF LC is defined in SECTION 2.2(A).

     OBLIGATION means all present and future indebtedness, liabilities, and
obligations, and all renewals and extensions thereof, or any part thereof, now
or hereafter owed to Administrative Agent, any Lender, or any Affiliate of any
Lender by any Company or Guarantor arising from, by virtue of, or pursuant to

                                       20
<PAGE>
 
any Loan Paper, TOGETHER WITH all interest accruing thereon, fees, costs, and
expenses (including, without limitation, all attorneys' fees and expenses
incurred in the enforcement or collection thereof) payable under the Loan
Papers.

     PARTICIPANT is defined in SECTION 13.13(E).

     PBGC means the Pension Benefit Guaranty Corporation, or any successor
thereof, established pursuant to ERISA.

     PERMITTED ACQUISITION means:

          (a) Acquisitions by any Company of any Acquisition Target with respect
     to which each of the following requirements shall have been satisfied:

               (i) Administrative Agent shall receive at least fifteen (15)
          days' prior written notice of such proposed Permitted Acquisition,
          which notice shall include a reasonably detailed description of the
          Acquisition Target and the terms of such proposed Permitted
          Acquisition, together with a copy of the Integrated Orthopaedics, Inc.
          Funding Request Memorandum, substantially in the form previously
          furnished to Administrative Agent containing an executive summary,
          practice overview, transaction summary and economic analysis, market
          survey, growth strategy, financial overview and risk analysis and
          related information with respect to such Acquisition Target and
          proposed Permitted Acquisition;

               (ii) such Permitted Acquisition shall involve an Acquisition
          Target operating solely within one or more of the 50 states of the
          United States of America or the District of Columbia, shall be
          consensual, shall have been approved by the Acquisition Target board
          of directors or other governing authority or its authorized legal
          representative or its stockholders or other equity holders, and shall
          not, involve an aggregate cash paid and debt issued or assumed
          consideration in an amount that exceeds $10,000,000;

               (iii) the Administrative Agent shall have received on or within
          30 days following the closing date of any such Permitted Acquisition:
          with respect to a Practice Acquisition, copies of each of: (A) the
          acquisition or merger agreements, (B) the applicable completed closing
          checklist, and (C) the Service Agreements, which shall contain terms
          and provisions substantially similar to the Service Agreement Basic
          Provisions (except that the term of any such Service Agreement
          pursuant to SECTION 6.1 of the Service Agreement Basic Provisions may
          be modified provided that such term is not reduced to a period of less
          than 30 years) and no other terms or provisions which would have the
          effect of modifying or varying such Service Agreement Basic
          Provisions, and the Seller Notes, the terms and conditions of each of
          which shall be substantially similar to the terms and conditions of
          the Seller Note previously furnished to Administrative Agent and which
          shall contain the subordination

                                       21
<PAGE>
 
          provisions described in EXHIBIT H hereto;

               (iv) at least five (5) Business Days prior to the closing date of
          any such proposed Permitted Acquisition, Borrower shall have delivered
          to Administrative Agent, in form and substance satisfactory to
          Administrative Agent, a certificate of the chief financial officer of
          Borrower in the form of EXHIBIT E-2 to the effect that: (A) at the
          time of such Permitted Acquisition and after giving effect thereto, no
          Default or Potential Default will have occurred and be continuing; and
          (B) on a pro forma basis Borrower would have been in compliance with
          the financial covenants set forth in SECTION 9.30 as of the most
          recent test period for which such covenants were tested, which
          covenants shall be calculated (in addition to the assumptions
          specified in SECTION 9.30) as if: (x) such Acquisition and all other
          Acquisitions closed or to be closed following such test period and
          prior to the proposed closing date of the proposed Permitted
          Acquisition had occurred at the beginning of such test period and
          Borrower had received income attributable to such Acquisition Target
          and such other acquired entities based on the actual performance of
          such Acquisition Target and such other acquired entities over such
          period (adjusted to reflect the PRO FORMA effect of Borrower's
          physician compensation model as appropriate) and had incurred the Debt
          and expenses incurred to purchase such Acquisition Target and such
          other acquired entity at the beginning of such period and repaid,
          retired, disposed of or refinanced any Debt repaid, retired, disposed
          of or refinanced or to be repaid, retired, disposed of or refinanced
          in such acquisition at the beginning of such period, and (y) any
          disposition of stock or of all or substantially all of the assets of
          any Subsidiary by Borrower or any of its Subsidiaries and any
          termination of a Service Agreement (which Service Agreement is not
          contemporaneously replaced by a Service Agreement with the same
          Managed Practice that provides substantially the same or more EBITDA
          to Borrower and its Subsidiaries as the terminated Service Agreement)
          that have occurred or are to occur following such test period and
          prior to the proposed closing date of the proposed Permitted
          Acquisition had occurred at the beginning of such test period and the
          Borrower had not received any EBITDA attributable to such entity
          disposed of or any Divested EBITDA attributable to such terminated
          Service Agreement over such period and had incurred any Debt or
          expense incurred in connection with such disposition or termination at
          the beginning of such period and had repaid, retired, disposed of or
          refinanced any Debt that was or is to be repaid, retired or disposed
          of or refinanced in connection with such disposition or termination
          (to the extent that the Borrower and its Subsidiaries have been, or
          are to be, released from all liability with respect thereto) at the
          beginning of such period;

               (v) on or prior to the date of such Permitted Acquisition,
          Administrative Agent shall have received, in form and substance
          satisfactory to Administrative Agent, such documents and instruments
          as it shall require to evidence the joinder of any

                                       22
<PAGE>
 
          new Subsidiary, to the Subsidiary Guaranty and Subsidiary Pledge and
          Security Agreement and the perfection of all liens created thereunder
          as further set forth in SECTION 9.17 hereof;

               (vi) at least 40% of the aggregate consideration paid for
          Permitted Acquisitions during any fiscal quarter must be stock of the
          Borrower, proceeds from the sale of stock of the Borrower, or
          Subordinated Debt or a combination thereof; and

               (vii) all Acquisition Targets for which the Acquisition is
          consummated must become or, in connection with an acquisition of
          assets or a merger or similar combination, be acquired by a Wholly-
          owned Subsidiary.

          (b) any other Acquisition for which the prior written consent of
     Required Lenders has been obtained.

     PERMITTED ACQUISITION COMPLIANCE CERTIFICATE means a certificate signed
by a Responsible Officer of Borrower, substantially in the form of EXHIBIT E-2.

     PERMITTED DEBT means Debt permitted under SECTION 9.13 as described in
such Section.

     PERMITTED LIENS means Liens permitted under SECTION 9.14 as described
in such Section.

     PERSON means any individual, entity, or Governmental Authority.

     POTENTIAL DEFAULT means the occurrence of any event or existence of any
circumstance which, with the giving of notice or lapse of time or both, would
become a Default.

     PRACTICE ACQUISITION shall mean a Permitted Acquisition that results in
the acquisition directly or indirectly by the Borrower or any Subsidiary, of
all or substantially all of the non-medical assets, and in Borrower's or any
Subsidiaries' discretion, and where permitted by applicable law, some or all of
the medical assets of a physician or physician group providing musculoskeletal-
related professional services.

     PRIME RATE means the per annum rate of interest established from time
to time by NationsBank, N.A., as its prime rate, which rate may not be the
lowest rate of interest charged by NationsBank, N.A. to its customers.

     PRO FORMA DATE OF INITIAL BORROWING means the first day of the most
recently completed fiscal quarter of Borrower for which Borrower has delivered
to Administrative Agent the Financial Statements described in SECTION 9.3
preceding the date of the Initial Borrowing.

     PRO FORMA EBITDA means, as calculated at any date of determination, the
SUM (without duplication) of (a) Borrower's consolidated GAAP LTM EBITDA, PLUS
(b) Acquired EBITDA MINUS (c) Divested EBITDA.

     PRO RATA or PRO RATA PART, for each Lender, means (a) for purposes of
any commitment to fund (or to purchase participations pursuant to SECTION 2.2

                                       23
<PAGE>
 
OR SECTION 2.3) in respect of the Revolver Facility, the L/C Subfacility, or the
Swing Line Subfacility, respectively, the percentage stated opposite such
Lender's name as set forth on SCHEDULE 2.1 or on the most recently amended
SCHEDULE 2.1, if any, prepared by Administrative Agent pursuant to
SECTION 13.13, (b) for purposes of sharing any amount or fee payable to any
Lender in respect of the Revolver Facility, the L/C Subfacility, or the Swing
Facility, respectively, the proportion (whether held directly or through a
participation therein pursuant to SECTION 2.2 OR SECTION 2.3 and determined
after giving effect thereto) which the portion of the Revolving Principal Debt,
Swing Principal Debt, or LC Exposure, as applicable, owed to such Lender bears
to the Revolving Principal Debt, Swing Principal Debt, or LC Exposure, as
applicable, owed to all Lenders at the time in question, and (c) for all other
purposes, the proportion which the portion of the Revolver Principal Debt owed
to such Lender bears to the Revolver Principal Debt owed to all Lenders at the
time in question, or if no Revolver Principal Debt is outstanding, then the
proportion that the aggregate of such Lender's Committed Sums under the Revolver
Facility bears to the Revolver Commitment then in effect.

      PURCHASE MONEY DEBT means Debt incurred by a Company to finance the
acquisition of assets.

      REGISTER is defined in SECTION 13.13(C).

      REGULATION D means Regulation D of the Board of Governors of the Federal
Reserve System, as amended.

      REGULATION U means Regulation U of the Board of Governors of the Federal
Reserve System, as amended.

      RELEASE means any spilling, leaking, pumping, pouring, emitting, emptying,
discharging, injecting, escaping, leaching, dumping, disposal, deposit,
dispersal, migrating, or other movement into the air, ground, or surface water,
or soil.

      RENTAL EXPENSE for any Person during any period, means the actual rent
paid by such Person during any period with respect to operating leases under
which any Person is lessee, without regard to any prepayments of rent.

      REPORTABLE EVENT shall have the meaning specified in SECTION 4043 of ERISA
or the regulations issued thereunder in connection with an Employee Plan,
excluding events for which the notice requirement is waived under applicable
PBGC regulations other than those events described in SECTIONS 2615.11, 2615.15
and 2615.19 of such regulations, including each such provision as it may
subsequently be renumbered.

      REPRESENTATIVES  means representatives, officers, directors, employees,
attorneys, and agents.

      REQUIRED LENDERS means (a) on any date of determination prior to
termination of the Revolver Commitment, those Lenders (other than Defaulting
Lenders) holding 66-2/3% or more of the Revolver Commitment (other than the
Revolver Commitment of the Defaulting Lenders), or (b) on any date of
determination occurring after the Revolver Commitment has terminated, those
Lenders (other than Defaulting Lenders) holding 66-2/3% or more of the

                                       24
<PAGE>
 
outstanding Revolver Principal Debt (other than the Revolving Principal Debt of
the DEFAULTING Lenders).

      RESERVE REQUIREMENT means, at any time, the maximum rate at which reserves
(including, without limitation, any marginal, special, supplemental, or
emergency reserves) are required to be maintained under regulations issued from
time to time by the Board of Governors of the Federal Reserve System (or any
successor) by member banks of the Federal Reserve System against, in the case of
Eurodollar Rate Borrowings, "EUROCURRENCY LIABILITIES" (as such term is used in
Regulation D). Without limiting the effect of the foregoing, the Reserve
Requirement shall reflect any other reserves required to be maintained by such
member banks with respect to (a) any category of liabilities which includes
deposits by reference to which the Adjusted Eurodollar Rate is to be determined,
or (b) any category of extensions of credit or other assets which include
Eurodollar Rate Borrowings. The Adjusted Eurodollar Rate shall be adjusted
automatically on and as of the effective date of any change in the Reserve
Requirement.

      RESPONSIBLE OFFICER means the president, chief executive officer, chief
financial officer, senior vice president, or treasurer of Borrower, or, for all
purposes under the Loan Papers, any other officer designated from time to time
by the Board of Directors of Borrower, which designated officer is acceptable to
Administrative Agent.

      RESTRICTED PAYMENTS means: (a) redemptions, repurchases, dividends, and
distributions of any kind in respect of Borrower's or any other Company's
capital stock (including without limitation any class of common or preferred
shares); (b) Distributions of any kind in respect of partnership interests of
any Company; and (c) payments of principal and interest on, and any redemptions
or repurchases of, Subordinated Debt.

      REVOLVER COMMITMENT means an amount (subject to reduction or cancellation
as herein provided) equal to $65,000,000.

      REVOLVER COMMITMENT USAGE means, at the time of any determination thereof,
the SUM of (a) the aggregate Revolver Principal Debt (whether under the Swing
Line Subfacility, or otherwise), PLUS, WITHOUT DUPLICATION, (b) the LC Exposure.

      REVOLVER FACILITY means the credit facility as described in and subject to
the limitations set forth in SECTION 2.1 hereof.

      REVOLVER NOTE means a promissory note in substantially the form of
EXHIBIT A-1, and all renewals and extensions of all or any part thereof.

      REVOLVER PRINCIPAL DEBT means, on any date of determination, the aggregate
unpaid principal balance of all Borrowings under the Revolver Facility
(including the Swing Line Subfacility), together with the aggregate unpaid
reimbursement obligations of Borrower in respect of drawings of drafts under any
LC.

      RIGHTS means rights, remedies, powers, privileges, and benefits.

      SCHEDULE means, unless specified otherwise, a schedule attached to this

                                       25
<PAGE>
 
Agreement,  as the same may be supplemented and modified from time to time in
accordance with the terms of the Loan Papers.

      SELLER NOTE means a non-negotiable promissory note made by a Company,
payable to an Acquisition Target or the stockholders or equity holders thereof,
containing the subordination provisions and other terms set forth in EXHIBIT H
hereto.

      SERVICE AGREEMENT means an agreement between the Borrower or one or more
of Borrower's Subsidiaries and one or more Managed Practices pursuant to which
the Borrower or such Subsidiaries agree to provide or arrange for comprehensive
management, administrative and other non-medical support services to such
Managed Practice(s) in exchange for the payment by the Managed Practice to the
Borrower or such Subsidiary of a service fee.

      SERVICE AGREEMENT BASIC PROVISIONS means the terms and provisions
contained in the following Articles and Sections of the form Service Agreement
previously furnished to Administrative Agent in connection with the execution
and delivery of this Agreement: Sections 1.1, 2.4, 2.7, 2.11, 2.12, 2.13.1,
2.15, and 2.16, Article III (other than SECTION 3.6), Article V (other than
SECTION 5.5), Article VI, Article VII (to the extent that any terms defined
therein are used in the other articles and sections listed herein) and
Article VIII.

      SOLVENT means, as to a Person, that (a) the aggregate fair market value of
such Person's assets exceeds its liabilities (whether contingent, subordinated,
unmatured, unliquidated, or otherwise), (b) such Person has sufficient cash flow
to enable it to pay its Debts as they mature, and (c) such Person does not have
unreasonably small capital to conduct such Person's businesses.

      SUBORDINATED DEBT means any Debt of any Company evidenced by a Seller Note
provided that such Debt is at all times subordinated to the payment and
performance of the Obligation pursuant to the provisions set forth in EXHIBIT H
hereto or such other written subordination agreement as may be in form and
substance reasonably satisfactory to Administrative Agent.

      SUBSIDIARY of any Person means (a) any entity of which an aggregate of
more than 50% (in number of votes) of the stock is owned of record or
beneficially, directly or indirectly, by such Person, or (b) any partnership
(limited or general) of which such Person shall at any time be the general
partner or own fifty percent (50%) or more of the issued and outstanding
partnership interests.

      SWING LINE BORROWING means any Borrowing under the Swing Line Subfacility.

      SWING LINE LENDER means NationsBank, N.A.

      SWING LINE NOTE means a promissory note in substantially the form of
EXHIBIT A-2 and all renewals and extensions of all or any part thereof.

      SWING LINE SUBFACILITY means the subfacility under the Revolver Facility,
the Principal Debt of which may never exceed the aggregate of

                                       26
<PAGE>
 
$5,000,000, as described in, and subject to the limitations of, SECTION 2.3.

      SWING LINE PRINCIPAL DEBT means, on any date of determination, that
portion of the Revolver Facility Principal Debt outstanding under the Swing Line
Subfacility.

      TAXES means, for any Person, taxes, assessments, or other governmental
charges or levies imposed upon such Person, its income, or any of its
properties, franchises, or assets.

      TERMINATION DATE means the EARLIER of (a) July 10, 2001, and (b) the
effective date of any other termination or cancellation of Lenders' commitments
to lend under, and in accordance with, this Agreement.

      THIRD PARTY PAYOR shall mean any governmental entity, insurance company,
health maintenance organization, professional provider organization or similar
entity that is obligated to make payments on behalf of any account debtor of any
Person.

      TOTAL FUNDED DEBT means (without duplication), as of any date of
determination with respect to any Person, the SUM of the following: (a) all
liabilities, obligations, and indebtedness of such Person which in accordance
with GAAP should be classified upon such Person's balance sheet as liabilities
in respect of (i) money borrowed, including, without limitation, the Revolver
Principal Debt; and (ii) obligations of such Person under Capital Leases; and
(b) the face amount of all letters of credit and Banker's acceptances issued for
the account of such Person, and without duplication, all drafts drawn and unpaid
thereunder.

      TYPE means any type of Borrowing determined with respect to the interest
option applicable thereto.

      VOTING STOCK means securities (as such term is defined in SECTION 2(l) of
the Securities Act of 1933, as amended) of any class or classes, the holders of
which are ordinarily, in the absence of contingencies, entitled to elect a
majority of the corporate directors (or Persons performing similar functions).

      WHOLLY-OWNED when used in connection with any Subsidiary shall mean a
Subsidiary of which all of the issued and outstanding shares of stock (EXCEPT
shares required as directors, qualifying shares) shall be owned by Borrower or
one or more of its Wholly-owned Subsidiaries.

      1.2   NUMBER AND GENDER OF WORDS; OTHER REFERENCES. Unless otherwise
specified in the Loan Papers, (a) where appropriate, the singular includes the
plural and VICE VERSA, and words of any gender include each other gender, (b)
heading and caption references may not be construed in interpreting provisions,
(c) monetary references are to currency of the United States of America, (d)
section, paragraph, annex, schedule, exhibit, and similar references are to the
particular Loan Paper in which they are used, (e) references to "TELECOPY,"
"FACSIMILE," "FAX," or similar terms are to facsimile or telecopy
transmissions, (f) references to "INCLUDING" mean including without limiting the
generality of any description preceding that word, (g) the rule of construction
that references to general items that follow references to specific items are
limited to the same type or character of those specific

                                       27
<PAGE>
 
items is not applicable in the Loan Papers, (h) references to any Person include
that Person's heirs, personal representatives, successors, trustees, receivers,
and permitted assigns, (i) references to any Law include every amendment or
supplement to it, rule and regulation adopted under it, and successor or
replacement for it, and (j) references to any Loan Paper or other document
include every renewal and extension of it, amendment and supplement to it, and
replacement or substitution for it.

      1.3   ACCOUNTING PRINCIPLES. All accounting and financial terms used in
the Loan Papers and the compliance with each financial covenant therein shall be
determined in accordance with GAAP, and, all accounting principles shall be
applied on a consistent basis so that the accounting principles in a current
period are comparable in all material respects to those applied during the
preceding comparable period. If Borrower or any Lender determines that a change
in GAAP from that in effect on the date hereof has altered the treatment of
certain financial data to its detriment under this Agreement, such party may, by
written notice to the others and Administrative Agent not later than ten (10)
days after the effective date of such change in GAAP, request renegotiation of
the financial covenants affected by such change. If the Borrower and Required
Lenders have not agreed on revised covenants within thirty (30) days after
delivery of such notice, then, for purposes of this Agreement, GAAP will mean
generally accepted accounting principles on the date just prior to the date on
which the change that gave rise to the renegotiation occurred.

SECTION 2    BORROWING PROVISIONS.

        2.1  COMMITMENTS. Subject to and in reliance upon the terms, conditions,
representations, and warranties in the Loan Papers, each Lender severally and
not jointly agrees to lend to Borrower such Lender's Pro Rata Part of one or
more Borrowings under the Revolver Facility not to exceed such Lender's
Committed Sum under the Revolver Facility, which, may be repaid and reborrowed
from time to time in accordance with the terms and provisions of the Loan
Papers; PROVIDED THAT, (a) each such Borrowing must occur on a Business Day and
no later than the Business Day immediately preceding the Termination Date; (b)
each such Borrowing shall be in an amount not less than $1,000,000 or a greater
integral multiple of $1,000,000, or $250,000 or a greater integral multiple
thereof if a Swing Line Borrowing; (c) on any date of determination, the
Revolver Commitment Usage shall never exceed the Revolver Commitment; and (d)
outstanding principal Borrowings under the Revolver Facility other than
Borrowings used to finance the purchase price of any Permitted Acquisition
(including, without limitation, the portion of such purchase price allocated to
accounts receivable and other working capital assets) may not at any time exceed
the Maximum Working Capital Commitment.

        2.2  LC SUBFACILITY UNDER REVOLVER FACILITY.

             (a) Subject to the terms and conditions of this Agreement and
        applicable Law, Administrative Agent agrees to issue LCs upon Borrower's
        application therefor (denominated in Dollars) by delivering to
        Administrative Agent a properly completed notice (a "NOTICE OF LC,"
        substantially in the form of EXHIBIT B-3) and an LC Agreement with
        respect thereto no later than 10:00 a.m. Dallas, Texas time three

                                       28
<PAGE>
 
        Business Days before such LC is to be issued; PROVIDED THAT, (i) on any
        date of determination and after giving effect to any LC to be issued on
        such date, the Revolver Commitment Usage shall not exceed the Revolver
        Commitment then in effect, (ii) on any date of determination and after
        giving effect to any LC to be issued on such date, the LC Exposure shall
        not exceed $5,000,000, (iii) at the time of issuance of such LC, no
        Default or Potential Default shall have occurred and be continuing, and
        (iv) each LC must expire NO LATER than the EARLIER of the thirtieth
        (30th) day prior to the Termination Date or one year from its issuance;
        PROVIDED THAT, any LC may provide for automatic renewal for successive
        twelve month periods (but no renewal period may extend beyond the
        thirtieth (30th) day prior to the Termination Date) unless
        Administrative Agent has given prior notice to the applicable
        beneficiary of its election not to extend such LC.

             (b) Immediately upon the issuance by Administrative Agent of any
        LC, Administrative Agent shall be deemed to have sold and transferred to
        each other Lender, and each other such Lender shall be deemed
        irrevocably and unconditionally to have purchased and received from
        Administrative Agent, without recourse or warranty, an undivided
        interest and participation, to the extent of such Lender's Pro Rata
        Part, in such LC, and all Rights of Administrative Agent in respect
        thereof (OTHER THAN Rights to receive certain fees provided for in
        SECTION 2.2(C)). Upon the issuance, renewal, or extension of an LC,
        Administrative Agent shall provide copies of such LC to each other
        Lender.

             (c) In order to induce Administrative Agent to issue and maintain
        LCs and Lenders to participate therein, Borrower agrees to pay or
        reimburse Administrative Agent (i) on the date on which any draft is
        presented under any LC, the amount of any draft paid or to be paid by
        Administrative Agent and (ii) promptly, upon demand, the amount of any
        fees (in addition to the fees described in SECTION 5) which
        Administrative Agent customarily charges to a Person similarly situated
        in the ordinary course of its business for amending LC Agreements, for
        honoring drafts, and taking similar action in connection with letters of
        credit; PROVIDED THAT, (x) if Borrower has not reimbursed Administrative
        Agent for any drafts paid or to be paid within 24 hours of demand
        therefor by Administrative Agent, Administrative Agent is hereby
        irrevocably authorized to fund such reimbursement obligations as a
        Borrowing under the Revolver Facility to the extent of availability
        under the Revolver Facility, and the proceeds of such Borrowing under
        the Revolver Facility shall be advanced directly to Administrative Agent
        in payment of Borrower's reimbursement obligation with respect to the
        draft under the LC; and (y) if for any reason, funds are not advanced
        pursuant to the Revolver Facility, then Borrower's reimbursement
        obligation shall continue to be due and payable. Borrower's obligations
        under this SECTION 2.2(C) shall be absolute and unconditional under any
        and all circumstances and irrespective of any setoff, counterclaim, or
        defense to payment which Borrower may have at any time against
        Administrative Agent or any other Person, and shall be made in
        accordance with the terms and conditions of this Agreement UNDER ALL
        CIRCUMSTANCES, including, without limitation, any of the following
        circumstances: (A) any lack of validity or enforceability of

                                       29
<PAGE>
 
this Agreement or any of the Loan Papers; (B) the existence of any claim,
setoff, defense, or other Right which Borrower may have at any time against a
beneficiary named in a LC, any transferee of any LC (or any Person for whom any
such transferee may be acting), Administrative Agent, any Lender, or any other
Person, whether in connection with this Agreement, any LC, the transactions
contemplated herein, or any unrelated transactions (including any underlying
transaction between Borrower and the beneficiary named in any such LC); (C) any
draft, certificate, or any other document presented under the LC proving to be
forged, fraudulent, invalid, or insufficient in any respect or any statement
therein being untrue or inaccurate in any respect; and (D) the occurrence of any
Potential Default or Default . To the extent any funding of a draft has been
made by Lenders pursuant to SECTION 2.2(E) or under the Revolver Facility,
Administrative Agent shall promptly distribute any such payments received from
Borrower with respect to such draft to all Lenders funding such draft according
to their ratable share. Interest on any amounts by remaining unpaid by Borrower
(and unfunded by a Borrowing under the Revolver Facility) under this CLAUSE at
any time from and after the date such amounts become payable until paid in full
shall be payable by Borrower to Administrative Agent at the Default Rate. In the
event any payment by Borrower received by Administrative Agent with respect to
an LC and distributed to Lenders on account of their participations therein is
thereafter set aside, avoided, or recovered from Administrative Agent in
connection with any receivership, liquidation, or bankruptcy proceeding, each
Lender which received such distribution shall, upon demand by Administrative
Agent, contribute such Lender's ratable portion of the amount set aside,
avoided, or recovered, TOGETHER WITH interest at the rate required to be paid by
Administrative Agent upon the amount required to be repaid by it. Without
limiting the absolute and unconditional nature of Borrower's obligations under
this SECTION 2.2(C) as provided herein, nothing in this Agreement shall
constitute a waiver of Borrower's Rights to assert a separate and independent
claim based upon the gross negligence or willful misconduct of Administrative
Agent with respect to any LC issued hereunder.

      (d) If any draft shall be presented for honor under any LC, Administrative
Agent shall promptly notify Borrower of the date and amount of such draft;
PROVIDED THAT, failure to give any such notice shall not affect the obligations
of Borrower hereunder. Administrative Agent shall make payment upon presentment
of a draft for honor unless it appears that presentment on its face does not
comply with the terms of such LC, regardless of whether (i) any default or
potential default under any other agreement has occurred and (ii) the
obligations under any other agreement have been performed by the beneficiary or
any other Person (and Administrative Agent shall not be liable for any
obligation of any Person thereunder). Administrative Agent and Lenders shall not
be responsible for, and Borrower's reimbursement obligations for honored drafts
shall not be affected by, any matter or event whatsoever (including, without
limitation, the validity or genuineness of documents or of any endorsements
thereof, even if such documents should in fact prove to be in any respect
invalid, fraudulent, or forged), or any dispute among any Company, the
beneficiary of any LC, or any other Person to whom any LC may be transferred, or
any claims whatsoever of

                                       30
<PAGE>
 
any company against any beneficiary of any LC or any such transferee; PROVIDED
THAT, nothing in this Agreement shall constitute a waiver of Borrower's Rights
to assert any claim based upon the gross negligence or wilful misconduct of
Administrative Agent or any Lender.

      (e) If Borrower fails to reimburse Administrative Agent as provided in
SECTION 2.2(C) within one Business Day of the demand therefor by Administrative
Agent, Administrative Agent shall promptly notify each Lender of such failure,
of the date and amount of the draft paid, and of such Lender's Pro Rata Part
thereof. Each Lender shall promptly and unconditionally make available to
Administrative Agent in immediately available funds such Lender's Pro Rata Part
of such unpaid reimbursement obligation, which funds shall be paid to
Administrative Agent on or before the close of business on the Business Day on
which such notice was given by Administrative Agent (if given prior to
1:00 p.m., Dallas, Texas time) or on the next succeeding Business Day (if notice
was given after 1:00 p.m., Dallas, Texas time). All such amounts payable by any
such Lender shall include interest thereon accruing at the Federal Funds Rate
from the day the applicable draft is paid by Administrative Agent to (but not
including) the date such amount is paid by such Lender to Administrative Agent.
The obligations of Lenders to make payments to Administrative Agent with respect
to LCs shall be irrevocable and not subject to any qualification or exception
whatsoever (other than the gross negligence or willful misconduct of
Administrative Agent) and shall be made in accordance with the terms and
conditions of this Agreement under all circumstances, including, without
limitation, any of the following circumstances: (i) any lack of validity or
enforceability of this Agreement or any of the Loan Papers; (ii) the existence
of any claim, setoff, defense, or other Right which Borrower may have at any
time against a beneficiary named in a LC, any transferee of any LC (or any
Person for whom any such transferee may be acting), Administrative Agent, any
Lender, or any other Person, whether in connection with this Agreement, any LC,
the transactions contemplated herein, or any unrelated transactions (including
any underlying transaction between Borrower and the beneficiary named in any
such LC); (iii) any draft, certificate, or any other document presented under
the LC proving to be forged, fraudulent, invalid, or insufficient in any respect
or any statement therein being untrue or inaccurate in any respect; and (iv) the
occurrence of any Potential Default or Default.

      (f) Borrower acknowledges that each LC will be deemed issued upon delivery
to its beneficiary or Borrower. If Borrower requests any LC be delivered to
Borrower rather than the beneficiary, and Borrower subsequently cancels such LC,
Borrower agrees to return it to Administrative Agent together with Borrower's
written certification that it has never been delivered to such beneficiary. If
any LC is delivered to its beneficiary pursuant to Borrower's instructions, no
cancellation thereof by Borrower shall be effective without written consent of
such beneficiary to Administrative Agent and return of such LC to Administrative
Agent. Borrower hereby agrees that if Administrative Agent becomes involved in
any dispute as a result of Borrower's cancellation of any LC, it shall indemnify
Administrative Agent and Lenders for all losses, costs, damages, expenses, and

                                       31
<PAGE>
 
reasonable attorneys' fees suffered or incurred by Administrative Agent and
Lenders as a direct result thereof.

      (g) Administrative Agent agrees with each Lender that it will exercise and
give the same care and attention to each LC as it gives to its other letters of
credit, and Administrative Agent's sole liability to each Lender with respect to
such LCs (OTHER THAN liability arising from the gross negligence or willful
misconduct of Administrative Agent) shall be to distribute promptly to each
Lender who has acquired a participating interest therein such Lender's ratable
portion of any payments made to Administrative Agent by Borrower pursuant to
SECTION 2.2(C). Each Lender and Borrower agree that, in paying any draw under
any LC, Administrative Agent shall not have any responsibility to obtain any
document (OTHER THAN any documents required by the respective LC) or to
ascertain or inquire as to the validity or accuracy of any such document or the
authority of the Person delivering any such document. Administrative Agent,
Lenders, and their respective Representatives shall not be liable to any other
Lender or any Company for the use which may be made of any LC or for any acts or
omissions of any beneficiary thereof in connection therewith. Any action,
inaction, error, delay, or omission taken or suffered by Administrative Agent or
any of its Representatives under or in connection with any LC, the draws,
drafts, or documents relating thereto, or the transmission, dispatch, or
delivery of any message or advice related thereto, if in good faith and in
conformity with such Laws as Administrative Agent or any of its Representatives
may deem applicable and in accordance with the standards of care specified in
the UNIFORM CUSTOMS AND PRACTICE FOR DOCUMENTARY CREDITS issued by the
International Chamber of Commerce, as in effect on the date of issue of such LC,
shall be binding upon the Companies and Lenders and shall not place
Administrative Agent or any of its Representatives under any resulting liability
to any Company or any Lender. Any action taken or omitted to be taken by
Administrative Agent under or in connection with any LC if taken or omitted in
the absence of gross negligence or wilful misconduct shall not create for
Administrative Agent any resulting liability to any Lender or any Company.

      (h) On the Termination Date or upon any demand by Administrative Agent
upon the occurrence and during continuance of a Default, Borrower shall provide
to Administrative Agent, for the benefit of Lenders, (i) cash collateral in an
amount equal to 105% of the LC Exposure existing on such date, such cash and all
interest thereon shall constitute cash collateral for all LCs, or (ii) a
Collateral Letter of Credit; and (iii) such additional cash collateral as
Administrative Agent may from time to time require, so that the cash collateral
amount shall at all times equal or exceed 105% the LC Exposure.

      (i) Any cash collateral deposited under CLAUSE (I) above, and all interest
earned thereon, shall be held by Administrative Agent and invested and
reinvested at the expense and the written direction of Borrower, in U.S.
Treasury Bills with maturities of no more than ninety (90) days from the date of
investment.

      (j) IN ADDITION TO AMOUNTS PAYABLE AS ELSEWHERE PROVIDED IN THIS

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<PAGE>
 
AGREEMENT, BORROWER HEREBY AGREES TO PROTECT, INDEMNIFY, PAY, AND SAVE
ADMINISTRATIVE AGENT AND EACH LENDER HARMLESS FROM AND AGAINST ANY AND ALL
CLAIMS, DEMANDS, LIABILITIES, DAMAGES, OR LOSSES OF, OR OWED TO THIRD PARTIES,
AND ANY AND ALL RELATED COSTS, CHARGES, AND EXPENSES (INCLUDING REASONABLE
ATTORNEYS' FEES, INCLUDING ALLOCATED COSTS OF INTERNAL COUNSEL), WHICH
ADMINISTRATIVE AGENT, OR ANY LENDER MAY INCUR OR BE SUBJECT TO AS A CONSEQUENCE,
DIRECT OR INDIRECT, OF (A) THE ISSUANCE OF ANY LC, OR (B) THE FAILURE OF
ADMINISTRATIVE AGENT TO HONOR A DRAFT UNDER SUCH LC AS A RESULT OF ANY ACT OR
OMISSION, WHETHER RIGHTFUL OR WRONGFUL, OF ANY PRESENT OR FUTURE GOVERNMENTAL
AUTHORITY; PROVIDED THAT, Borrower shall have no liability to indemnify
Administrative Agent or any Lender in respect of any liability arising out of
the gross negligence or willful misconduct of such party or any Representatives
of such party. The provisions of and undertakings and indemnifications set forth
in this SECTION 2.2(j) shall survive the satisfaction and payment of the
obligation and termination of this Agreement.

      (k) Although referenced in any LC, terms of any particular agreement or
other obligation to the beneficiary are not in any manner incorporated herein.
The fees and other amounts payable with respect to each LC shall be as provided
in this Agreement, drafts under any LC shall be deemed part of the obligation,
and in the event of any conflict between the terms of this Agreement and any LC
Agreement, the terms of this Agreement shall be controlling.

2.3   SWING LINE SUBFACILITY UNDER REVOLVER FACILITY.

      (a) For the convenience of the parties and as an integral part of the
transactions contemplated by the Loan Papers, NationsBank, solely for its own
account, may make any requested Borrowing of $250,000 or a greater integral
multiple thereof, subject to those terms and conditions applicable to Borrowings
set forth in SECTION 7.3(C), (D), (E), and (F), directly to Borrower as a Swing
Line Borrowing without requiring any other Lender to fund its Pro Rata Part
thereof unless and until SECTION 2.3(B) is applicable; PROVIDED THAT: (i) each
such Borrowing must occur on a Business Day prior to, and not on or after, the
Termination Date; (ii) the aggregate Swing Line Principal Debt outstanding on
any date of determination shall not exceed $5,000,000; (iii) on any date of
determination, the Commitment Usage shall never exceed the Revolver Commitment;
(iv) at the time of such Swing Line Borrowing, no Default or Potential Default
shall have occurred and be continuing; (v) each Swing Line Borrowing shall be a
Base Rate Borrowing; PROVIDED THAT at any time after Lenders are deemed to have
purchased pursuant to SECTION 2.3(B) a participation in any Swing Line
Borrowing, such Borrowing shall bear interest at the Default Rate; and (vi) no
additional Swing Line Borrowing shall be made at any time after any Lender has
refused, notwithstanding the requirements of SECTION 2.3(B), to purchase a
participation in any Swing Line Borrowing as provided in such Section, and until
such purchase shall occur or until the Swing Line Borrowing has been repaid.
Each Borrowing under the Swing Line Subfacility shall be available and may be
prepaid on same day telephonic notice from Borrower to NationsBank, SO LONG AS
such notice is received by NationsBank prior to 12:00 noon (Dallas,

                                       33
<PAGE>
 
Texas time). Swing Line Borrowings are payable by Borrower upon demand by
NationsBank.

      (b) If Borrower fails to repay any Swing Line Borrowing within three
Business Days after demand by NationsBank (and in any event upon the earlier to
occur of a Default or the Termination Date), Administrative Agent shall timely
notify each Lender of such failure and of the date and amount not paid. No later
than the close of business on the date such notice is given (if such notice was
given prior to 12:00 noon Dallas time on any Business Day, or, if made at any
other time, on the next Business Day following the date of such notice), each
Lender shall be deemed to have irrevocably and unconditionally purchased and
received from NationsBank an undivided interest and participation in such Swing
Line Borrowing to the extent of such, Lender's Pro Rata Part thereof, and each
Lender shall make available to NationsBank in immediately available funds such
Lender's Pro Rata Part of such unpaid amount. All such amounts payable by any
Lender shall include interest thereon from the date on which such payment is
payable by such Lender to, but not including, the date such amount is paid by
such Lender to Administrative Agent, at the Federal Funds rate. If such Lender
does not promptly pay such amount upon Administrative Agent's demand therefor,
and until such time as such Lender makes the required payment, NationsBank shall
be deemed to continue to have outstanding a Swing Line Borrowing in the amount
of such unpaid obligation. Each payment by Borrower of all or any part of any
Swing Line Borrowing shall be paid to Administrative Agent for the ratable
benefit of Swing Line Lender and those Lenders who have funded their
participations in such Swing Line Debt under this SECTION 2.3(B); PROVIDED THAT,
with respect to any such participation, all interest accruing on the Swing Line
Principal Debt to which such participation relates prior to the date of funding
such participation shall be payable solely to NationsBank for its own account.

2.4   TERMINATION OF COMMITMENTS.

      Without premium or penalty, and upon giving not less than five (5)
Business Days prior written and irrevocable notice to Administrative Agent,
Borrower may terminate in whole or in part the unused portion of the Revolver
Commitment; PROVIDED THAT: (i) each partial termination shall be in an amount of
not less than $5,000,000 or a greater integral multiple of $1,000,000; (ii) the
amount of the Revolver Commitment may not be reduced below the Revolver
Commitment Usage; (iii) each reduction shall be allocated Pro Rata among the
Lenders in accordance with their respective Pro Rata Parts. Promptly after
receipt of such notice of termination or reduction, Administrative Agent shall
notify each Lender of the proposed cancellation or reduction. Such termination
or partial reduction of the Revolver Commitment shall be effective on the
Business Day specified in Borrower's notice (which date must be at least five
(5) Business Days after Borrower's delivery of such notice). In the event that
the Revolver Commitment is reduced to zero at a time when there shall be no LC
Exposure or Principal Debt, this Agreement shall be terminated to the extent
specified in SECTION 13.14, and all commitment fees and other fees then earned
and unpaid hereunder and all other

                                       34
<PAGE>
 
amounts of the obligation then due and owing shall be immediately due and
payable, without notice or demand by Administrative Agent or any Lender.

2.5   BORROWING PROCEDURE. The following procedures apply to borrowings (other
than Swing Line Borrowings):

      (a) Each Borrowing shall be made on Borrower's notice (a "NOTICE OF
BORROWING," substantially in the form of EXHIBIT B-1) to Administrative Agent
requesting that Lenders fund a Borrowing on a certain date (the "BORROWING
DATE"), which notice (i) shall be irrevocable and binding on Borrower, (ii)
shall specify if it is for a Borrowing under the Revolver Facility or the Swing
Line Facility, (iii) shall specify the Borrowing Date, amount, Type, and (for a
Borrowing comprised of Eurodollar Rate Borrowings) Interest Period, and (iv)
must be received by Administrative Agent no later than 10:00 a.m. Dallas, Texas
time on the third Business Day preceding the Borrowing Date for any Eurodollar
Rate Borrowing or on the Business Day immediately preceding the Borrowing Date
for any Base Rate Borrowing. Administrative Agent shall timely notify each
Lender with respect to each Notice of Borrowing.

      (b) Other than in connection with any Swing Line Borrowing, each Lender
shall remit its Pro Rata Part for the relevant Facility of each requested
Borrowing to Administrative Agent's principal office in Dallas, in funds which
are or will be available for immediate use by Administrative Agent by 1:00 p.m.
Dallas time on the Borrowing Date therefor. Subject to receipt of such funds,
Administrative Agent shall (unless to its actual knowledge any of the conditions
precedent therefor have not been satisfied by Borrower or waived by Required
Lenders) make such funds available to Borrower by causing such funds to be
deposited to Borrower's account as designated to Administrative Agent by
Borrower. Notwithstanding the foregoing, unless Administrative Agent shall have
been notified by a Lender prior to a Borrowing Date that such Lender does not
intend to make available to Administrative Agent such Lender's Pro Rata Part of
the applicable Borrowing, Administrative Agent may assume that such Lender has
made such proceeds available to Administrative Agent on such date, as required
herein, and Administrative Agent may (unless to its actual knowledge any of the
conditions precedent therefor have not been satisfied by Borrower or waived by
Required Lenders), in reliance upon such assumption (but shall not be required
to), make available to Borrower a corresponding amount in accordance with the
foregoing terms, but, if such corresponding amount is not in fact made available
to Administrative Agent by such Lender on such Borrowing Date, Administrative
Agent shall be entitled to recover such corresponding amount on demand (i) from
such Lender, together with interest at the Federal Funds Rate during the period
commencing on the date such corresponding amount was made available to Borrower
and ending on (but excluding) the date Administrative Agent recovers such
corresponding amount from such Lender, or (ii) if such Lender fails to pay such
corresponding amount forthwith upon such demand, then from Borrower, TOGETHER
WITH interest at a rate per annum equal to the applicable rate for such
Borrowing during the period commencing on such Borrowing Date

                                       35
<PAGE>
 
        and ending on (but excluding) the date Administrative Agent recovers
        such corresponding amount from Borrower. No Lender shall be responsible
        for the failure of any other Lender to make its Pro Rata Part of any
        Borrowing.

SECTION 3    TERMS OF PAYMENT.

        3.1  LOAN ACCOUNTS, NOTES, AND PAYMENTS.

             (a) The Revolver Principal Debt (other than the Swing Line
        Subfacility) owed to each Lender shall be evidenced by the Revolver
        Notes, one payable to each Lender in the maximum stated principal amount
        of each Lender's Committed Sum under the Revolver Facility as of the
        Closing Date.

             (b) The Revolver Principal Debt owed to the Swing Line Lender under
        the Swing Line Subfacility shall be evidenced by a Swing Line Note
        payable to such Lender in the maximum principal amount of $5,000,000.00.

             (c) Each payment or prepayment on the Obligation is due and must be
        paid at Administrative Agent's principal office in Dallas in funds which
        are or will be available for immediate use by Administrative Agent by
        12:00 noon Dallas, Texas time on the day due. Payments made after 12:00
        noon, Dallas, Texas, time shall be deemed made on the Business Day next
        following. Administrative Agent shall pay to each Lender any payment or
        prepayment to which such Lender is entitled hereunder on the same day
        Administrative Agent shall have received the same from Borrower;
        PROVIDED such payment or prepayment is received by Administrative Agent
        prior to 12:00 noon Dallas, Texas time, and otherwise before 12:00 noon
        Dallas time on the Business Day next following. If and to the extent
        Administrative Agent shall not make such payments to Lenders when due as
        set forth in the preceding sentence, such unpaid amounts shall accrue
        interest, payable by Administrative Agent, at the Federal Funds Rate
        from the due date until (but not including) the date on which
        Administrative Agent makes such payments to Lenders.

        3.2  INTEREST AND PRINCIPAL PAYMENTS.

             (a) Interest on each Eurodollar Rate Borrowing shall be due and
        payable as it accrues on the last day of its respective Interest Period
        and on the Termination Date, as applicable; PROVIDED THAT, with respect
        to Eurodollar Rate Borrowings having an Interest Period in excess of
        three (3) months, Borrower shall pay interest on the three month
        anniversary of the beginning of such Interest Period, on the expiration
        of each Interest Period, and on the Termination Date. Interest on each
        Base Rate Borrowing shall be due and payable as it accrues on each
        March 31, June 30, September 30, and December 31, and on the Termination
        Date.
        
             (b) (i) On any date of determination (i) if the Revolver Commitment
        Usage exceeds the Revolver Commitment, (ii) or if the Swing

                                       36
<PAGE>
 
        Line Principal Debt exceeds the Swing Line Subfacility, or (iii) if the
        sum of the Revolver Principal Debt, together (without duplication) with
        the LC Exposure, exceeds the Revolver Commitment, then Borrower shall
        make a mandatory prepayment of the Revolver Principal Debt of at least
        the amount of such excess, TOGETHER WITH (x) all accrued and unpaid
        interest on the principal amount so prepaid and (y) any Consequential
        Loss arising as a result thereof. All mandatory prepayments hereunder
        for the Revolver Facility shall be applied Pro Rata to each Lender's
        Committed Sum thereunder.

                 (ii) In the event of any sales permitted by SECTION 9.24(F) or
        SECTION 9.24(G), then Borrower shall make a mandatory prepayment of the
        Revolver Principal Debt of at least the amount of the net cash proceeds
        of such sale, transfer or disposition, TOGETHER WITH (x) all accrued and
        unpaid interest on the principal amount so prepaid and (y) any
        Consequential Loss arising as a result thereof. All mandatory
        prepayments hereunder for the Revolver Facility shall be applied Pro
        Rata to each Lender's Committed Sum thereunder.

             (c) After giving Administrative Agent advance written notice of the
        intent to prepay, Borrower may voluntarily prepay all or any part of the
        Principal Debt from time to time and at any time, in whole or in part,
        without premium or penalty; PROVIDED THAT: (i) such notice must be
        received by Administrative Agent by 12:00 noon Dallas, Texas time on (A)
        the third Business Day preceding the date of prepayment of a Eurodollar
        Rate Borrowing, and (B) the Business Day of a prepayment of a Base Rate
        Borrowing; (ii) each such partial prepayment must be in a minimum amount
        of at least $1,000,000 or a greater integral multiple of $1,000,000
        thereof (if a Eurodollar Rate Borrowing or a Base Rate Borrowing), or
        $250,000 or an integral multiple thereof (if a Swing Line Borrowing);
        (iii) all accrued interest on any Eurodollar Rate Borrowing being
        prepaid must also be paid in full, to the date of such prepayment; and
        (iv) Borrower shall pay any related Consequential Loss within ten (10)
        days after demand therefor. Each notice of prepayment shall specify the
        prepayment date, the Facility hereunder being prepaid, and the Type of
        Borrowing(s) and amount(s) of such Borrowing(s) to be prepaid and shall
        constitute a binding obligation of Borrower to make a prepayment on the
        date stated therein.

        3.3  INTEREST OPTIONS. Except where specifically otherwise provided,
Borrowings shall bear interest at a rate per annum equal to the LESSER OF (a) as
to the respective Type of Borrowing (as designated by Borrower in accordance
with this Agreement), the Base Rate PLUS the Applicable Margin for Base Rate
Borrowings or the Adjusted Eurodollar Rate PLUS the Applicable Margin for
Eurodollar Rate Borrowings, AND (b) the Maximum Rate. Each change in the Base
Rate or the Maximum Rate, subject to the terms of this Agreement, will become
effective, without notice to Borrower or any other Person, upon the effective
date of such change.

        3.4  QUOTATION OF RATES. It is hereby acknowledged that a Responsible
Officer or other appropriately designated officer of Borrower may call
Administrative Agent on or before the date on which a Notice of Borrowing is to
be delivered by Borrower in order to receive an indication of the rates then in
effect, but such indicated rates shall neither be binding upon Administrative

                                       37
<PAGE>
 
Agent or Lenders nor affect the rate of interest which thereafter is actually in
effect when the Notice of Borrowing is given.

        3.5  DEFAULT RATE. To the extent permitted by Law, upon the occurrence
and during the Default set forth in SECTIONS 10.1 and 10.3 or any failure to
comply with any covenant set forth in SECTION 9.30 hereof, all the Obligation
and accrued interest thereon shall bear interest at the Default Rate until paid,
regardless whether such payment is made before or after entry of a judgment;
PROVIDED THAT, the Default Rate shall automatically apply in the case of
SECTION 2.2(C) where the Default Rate is specified.

        3.6  INTEREST RECAPTURE. If the designated rate applicable to any
Borrowing exceeds the Maximum Rate, the rate of interest on such Borrowing shall
be limited to the Maximum Rate, but any subsequent reductions in such designated
rate shall not reduce the rate of interest thereon below the Maximum Rate until
the total amount of interest accrued thereon equals the amount of interest which
would have accrued thereon if such designated rate had at all times been in
effect. In the event that at maturity (stated or by acceleration), or at final
payment of the Principal Debt, the total amount of interest paid or accrued is
less than the amount of interest which would have accrued if such designated
rates had at all times been in effect, then, at such time and to the extent
permitted by Law, Borrower shall pay an amount equal to the difference between
(a) the LESSER OF the amount of interest which would have accrued if such
designated rates had at all times been in effect AND the amount of interest
which would have accrued if the Maximum Rate had at all times been in effect,
and (b) the amount of interest actually paid or accrued on the Principal Debt.

        3.7  INTEREST CALCULATIONS.

             (a) All payments of interest shall be calculated on the basis of
        actual number of days (including the first day but excluding the last
        day) elapsed but computed as if each calendar year consisted of 360 days
        in the case of a Eurodollar Rate Borrowing (unless such calculation
        would result in the interest on the Borrowings exceeding the Maximum
        Rate, in which event such interest shall be calculated on the basis of a
        year of 365 or 366 days, as the case may be), and 365 or 366 days, as
        the case may be, in the case of a Base Rate Borrowing. All interest rate
        determinations and calculations by Administrative Agent shall be
        conclusive and binding absent manifest error.

             (b) The provisions of this Agreement relating to the calculation of
        the Base Rate and the Adjusted Eurodollar Rate are included only for the
        purpose of determining the rate of interest or other amounts to be paid
        hereunder that are based upon such rate.

        3.8  MAXIMUM RATE. Regardless of any provision contained in any Loan
Paper, neither Administrative Agent nor any Lender shall ever be entitled to
contract for, charge, take, reserve, receive, or apply, as interest on the
obligation, or any part thereof, any amount in excess of the Maximum Rate, and,
if Lenders ever do so, then such excess shall be deemed a partial prepayment of
principal and treated hereunder as such and any remaining excess shall be
refunded to Borrower. In determining if the interest paid or payable exceeds the
Maximum Rate, Borrower and Lenders shall, to the maximum extent permitted

                                       38
<PAGE>
 
under applicable Law, (a) treat all Borrowings as but a single extension of
credit (and Lenders and Borrower agree that such is the case and that provision
herein for multiple Borrowings is for convenience only), (b) characterize any
nonprincipal payment as an expense, fee, or premium rather than as interest, (c)
exclude voluntary prepayments and the effects thereof, and (d) amortize,
prorate, allocate, and spread the total amount of interest throughout the entire
contemplated term of the Obligation; PROVIDED THAT, if the Obligation is paid
and performed in full prior to the end of the full contemplated term thereof,
and if the interest received for the actual period of existence thereof exceeds
the Maximum Amount, Lenders shall refund such excess, and, in such event,
Lenders shall not, to the extent permitted by Law, be subject to any penalties
provided by any Laws for contracting for, charging, taking, reserving, or
receiving interest in excess of the Maximum Amount.

        3.9  INTEREST PERIODS. When Borrower requests any Eurodollar Rate
Borrowing, Borrower may elect the interest period (each an "INTEREST PERIOD")
applicable thereto, which shall be, at Borrower's option, one, two, three, or
six months; PROVIDED, HOWEVER, that: (a) the initial Interest Period for a
Eurodollar Rate Borrowing shall commence on the date of such Borrowing
(including the date of any conversion thereto), and each Interest Period
occurring thereafter in respect of such Borrowing shall commence on the day on
which the next preceding Interest Period applicable thereto expires; (b) if any
Interest Period for a Eurodollar Rate Borrowing begins on a day for which there
is no numerically corresponding Business Day in the calendar month at the end of
such Interest Period, such Interest Period shall end on the next Business Day
immediately following what otherwise would have been such numerically
corresponding day in the calendar month at the end of such Interest Period
(UNLESS such date would be in a different calendar month from what would have
been the month at the end of such Interest Period, or UNLESS there is no
numerically corresponding day in the calendar month at the end of the Interest
Period; whereupon, such Interest Period shall end on the last Business Day in
the calendar month at the end of such Interest Period); (c) no Interest Period
may be chosen with respect to any portion of the Principal Debt which would
extend beyond the scheduled repayment date (including any dates on which
mandatory prepayments are required to be made) for such portion of the Principal
Debt; and (d) no more than an aggregate of six (6) Interest Periods shall be in
effect at one time.

        3.10 CONVERSIONS. Borrower may (a) convert a Eurodollar Rate Borrowing
on the last day of an Interest Period to a Base Rate Borrowing, (b) convert a
Base Rate Borrowing at any time to a Eurodollar Rate Borrowing, and (c) elect a
new Interest Period (in the case of a Eurodollar Rate Borrowing), by giving
notice (a "NOTICE OF CONVERSION," substantially in the form of EXHIBIT B-2) of
such intent no later than 10:00 a.m. Dallas, Texas time an the third Business
Day prior to the date of conversion or the last day of the Interest Period, as
the case may be (in the case of a conversion to a Eurodollar Rate Borrowing or
an election of a new Interest Period), and no later than 10:00 a.m. Dallas,
Texas time one Business Day prior to the last day of the Interest Period (in the
case of a conversion to a Base Rate Borrowing); PROVIDED THAT, the principal
amount converted to, or continued as, a Eurodollar Rate Borrowing shall be in an
amount not less than $1,000,000 or a greater integral multiple of $1,000,000.
Administrative Agent shall timely notify each Lender with respect to each Notice
of Conversion. Absent Borrower's Notice of Conversion or election of a new
Interest Period, a Eurodollar Rate Borrowing

                                       39
<PAGE>
 
shall be deemed converted to a Base Rate Borrowing effective as of the
expiration of the Interest Period applicable thereto. No Eurodollar Rate
Borrowing may be either made or continued as a Eurodollar Rate Borrowing, and no
Base Rate Borrowing may be converted to a Eurodollar Rate Borrowing, if the
interest rate for such Eurodollar Rate Borrowing would exceed the Maximum Rate.

        3.11 ORDER OF APPLICATION.

             (a) Payments and prepayments of the Obligation shall be applied in
        the order and manner specified in this Agreement; PROVIDED, HOWEVER, if
        no order is otherwise specified and no Default or Potential Default has
        occurred and is continuing, payments and prepayments of the Obligation
        shall be applied first to fees then due and payable, second to accrued
        interest then due and payable on the Principal Debt, and then to the
        remaining obligation in the order and manner as Administrative Agent may
        select.

             (b) If a Default or Potential Default has occurred and is
        continuing (or if Borrower fails to give directions as permitted under
        SECTION 3.11(A)), any payment or prepayment (including proceeds from the
        exercise of any Rights) shall be applied to the Obligation in the
        following order: (i) to the ratable payment of all fees, expenses, and
        indemnities for which Agents or Lenders have not been paid or reimbursed
        in accordance with the Loan Papers (as used in this SECTION 3.11(B)(I),
        a "RATABLE PAYMENT" for any Lender or any Agent shall be, on any date of
        determination, that proportion which the portion of the total fees,
        expenses, and indemnities owed to such Lender or such Agent bears to the
        total aggregate fees and indemnities owed to all Lenders and Agents on
        such date of determination); (ii) to the payment of accrued interest and
        principal of the Swing Line Debt; (iii) to the ratable payment of
        accrued and unpaid interest on the Revolver Principal Debt; (iv) to the
        ratable payment of any reimbursement obligation with respect to any LC
        issued pursuant to the Revolver Facility which is due and payable and
        which remains unfunded by any Borrowing under the Revolver Facility;
        PROVIDED THAT, such payments shall be allocated ratably among Issuing
        Bank and the Lenders which have funded their participation in such LC;
        (v) to the ratable payment of the Revolver Principal Debt; (vi) as a
        deposit with Administrative Agent, for the benefit of Lenders, as
        security for, and to provide for the payment of, any reimbursement
        obligations, if any, THEREAFTER arising with respect to any issued and
        outstanding LCs issued pursuant to the Revolver Facility; and (vii) to
        the payment of the remaining Obligation in the order and manner Required
        Lenders deem appropriate.

Subject to the provisions of SECTION 12 and PROVIDED THAT Administrative Agent
shall not in any event be bound to inquire into or to determine the validity,
scope, or priority of any interest or entitlement of any Lender and may suspend
all payments or seek appropriate relief (including, without limitation,
instructions from Required Lenders or an action in the nature of interpleader)
in the event of any doubt or dispute as to any apportionment or distribution
contemplated hereby, Administrative Agent shall promptly distribute such amounts
to each Lender in accordance with the Agreement and the related Loan Papers.

                                       40
<PAGE>
 
        3.12 SHARING OF PAYMENTS, ETC. If any Lender shall obtain any payment
(whether voluntary, involuntary, or otherwise, including, without limitation, as
a result of exercising its Rights under SECTION 3.13) which is in excess of its
ratable share of any such payment, such Lender shall purchase from the other
Lenders such participations as shall be necessary to cause such purchasing
Lender to share the excess payment ratably with each of them; PROVIDED, HOWEVER,
that if all or any portion of such excess payment is thereafter recovered from
such purchasing Lender, the purchase shall be rescinded and the purchase price
restored to the extent of such recovery. Borrower agrees that any Lender so
purchasing a participation from another Lender pursuant to this SECTION may, to
the fullest extent permitted by Law, exercise all of its Rights of payment
(including the Right of offset) with respect to such participation as fully as
if such Lender were the direct creditor of Borrower in the amount of such
participation.

        3.13 OFFSET. Upon the occurrence and during the continuance of a
Default, each Lender shall be entitled to exercise (for the benefit of all
Lenders in accordance with SECTION 3.12) the Rights of offset and/or banker's
Lien against each and every account and other property, or any interest therein,
which Borrower may now or hereafter have with, or which is now or hereafter in
the possession of, such Lender to the extent of the full amount of the
obligation.

        3.14 BOOKING BORROWINGS. To the extent permitted by Law, any Lender may
make, carry, or transfer its Borrowings at, to, or for the account of any of its
branch offices or the office of any of its Affiliates; PROVIDED THAT, no
Affiliate shall be entitled to receive any greater payment under SECTION 4 than
the transferor Lender would have been entitled to receive with respect to such
Borrowings.

SECTION 4    CHANGE IN CIRCUMSTANCES.

        4.1  INCREASED COST AND REDUCED RETURN.

             (a) If, after the date hereof, the adoption of any applicable, or
        any change in the interpretation or administration thereof by any
        Governmental Authority, or compliance by any Lender (or its Applicable
        Lending Office) with any request or directive (whether or not having the
        force of law) of any such Governmental Authority:

                 (i) shall subject such Lender (or its Applicable Lending
             Office) to any Tax or other charge with respect to any Eurodollar
             Rate Borrowing, its Notes, or its obligation to loan Eurodollar
             Rate Borrowings, or change the basis of taxation of any amounts
             payable to such Lender (or its Applicable Lending Office) under
             this Agreement or its Notes in respect of any Eurodollar Rate
             Borrowings (other than taxes imposed on the overall net income of
             such Lender by the jurisdiction in which such Lender has its
             principal office or such Applicable Lending office);

                 (ii) shall impose, modify, or deem applicable any reserve,
             special deposit, assessment, or similar requirement (other than

                                       41
<PAGE>
 
             the Reserve Requirement utilized in the determination of the
             Adjusted Eurodollar Rate) relating to any extensions of credit or
             other assets of, or any deposits with or other liabilities or
             commitments of, such Lender (or its Applicable Lending Office),
             including the commitment of such Lender hereunder; or

                 (iii) shall impose on such Lender (or its Applicable Lending
             Office) or the London interbank market any other condition
             affecting this Agreement or its Notes or any of such extensions of
             credit or liabilities or commitments;

        and the result of any of the foregoing is to increase the cost to such
        Lender (or its Applicable Lending office) of making, converting into,
        continuing, or maintaining any Eurodollar Rate Borrowings or to reduce
        any sum received or receivable by such Lender (or its Applicable Lending
        office) under this Agreement or its Notes with respect to any Eurodollar
        Rate Borrowing, then Borrower shall pay to such Lender on demand such
        amount or amounts as will compensate such Lender for such increased cost
        or reduction. If any Lender requests compensation by Borrower under this
        SECTION 4.1(A), Borrower may, by notice to such Lender (with a copy to
        Administrative Agent), suspend the obligation of such Lender to loan or
        continue Borrowings of the Type with respect to which such compensation
        is requested, or to convert Borrowings of any other Type into Borrowings
        of such Type, until the event or condition giving rise to such request
        ceases to be in effect (in which case the provisions of SECTION 4.4
        shall be applicable); PROVIDED, THAT such suspension shall not affect
        the right of such Lender to receive the compensation so requested.

               (b) If, after the date hereof, any Lender shall have determined
        that the adoption of any applicable Law regarding capital adequacy or
        any change therein or in the interpretation or administration thereof by
        any Governmental Authority charged with the interpretation or
        administration thereof, or any request or directive regarding capital
        adequacy (whether or not having the force of law) of any such
        Governmental Authority has or would have the effect of reducing the rate
        of return on the capital of such Lender or any corporation controlling
        such Lender as a consequence of such Lender's obligations hereunder to a
        level below that which such Lender or such corporation could have
        achieved but for such adoption, change, request, or directive (taking
        into consideration its policies with respect to capital adequacy), then
        from time to time upon demand Borrower shall pay to such Lender such
        additional amount or amounts as will compensate such Lender for such
        reduction.

               (c) Each Lender shall promptly notify Borrower and Administrative
        Agent of any event of which it has knowledge, occurring after the date
        hereof, which will entitle such Lender to compensation pursuant to this
        SECTION and will designate a different Applicable Lending Office if such
        designation will avoid the need for, or reduce the amount of, such
        compensation and will not, in the judgment of such Lender, be otherwise
        disadvantageous to it. Any Lender claiming compensation under this
        SECTION shall furnish to Borrower and Administrative Agent a statement
        setting forth the additional amount or amounts to be paid to it

                                       42
<PAGE>
 
        hereunder which shall be conclusive in the absence of manifest error. In
        determining such amount, such Lender may use any reasonable averaging
        and attribution methods.

        4.2   LIMITATION ON TYPES OF LOANS. If on or prior to the first day of
any Interest Period for any Eurodollar Rate Borrowing:

              (a) Administrative Agent determines (which determination shall be
        conclusive) that by reason of circumstances affecting the relevant
        market, adequate and reasonable means do not exist for ascertaining the
        Eurodollar Rate for such Interest Period; or

              (b) Required Lenders determine (which determination shall be
        conclusive) and notify Administrative Agent that the Adjusted EURODOLLAR
        RATE will not adequately and fairly reflect the cost to the Lenders of
        funding Eurodollar Rate Borrowings for such Interest Period;

then Administrative Agent shall give Borrower prompt notice thereof specifying
the relevant amounts or periods, and so long as such condition remains in
effect, the Lenders shall be under no obligation to fund additional Eurodollar
Rate Borrowings, continue Eurodollar Rate Borrowings, or to convert Base Rate
Borrowings into Eurodollar Rate Borrowings, and Borrower shall, on the last
day(s) of the then current Interest Period(s) for the outstanding Eurodollar
Rate Borrowings, either prepay such Borrowings or convert such Borrowings into
Base Rate Borrowings in accordance with the terms of this Agreement.

        4.3  ILLEGALITY. Notwithstanding any other provision of this Agreement,
in the event that it becomes unlawful for any Lender or its Applicable Lending
Office to make, maintain, or fund Eurodollar Rate Borrowings hereunder, then
such Lender shall promptly notify Borrower thereof and such Lender's obligation
to make or continue Eurodollar Rate Borrowings and to convert other Base Rate
Borrowings into Eurodollar Rate Borrowings shall be suspended until such time as
such Lender may again make, maintain, and fund Eurodollar Rate Borrowings (in
which case the provisions of SECTION 4.4 shall be applicable).

        4.4  TREATMENT OF AFFECTED LOANS. If the obligation of any Lender to
fund Eurodollar Rate Borrowings or to continue, or to convert Base Rate
Borrowings into Eurodollar Rate Borrowings, shall be suspended pursuant to
SECTIONS 4.1, 4.2, or 4.3 hereof, such Lender's Eurodollar Rate Borrowings shall
be automatically converted into Base Rate Borrowings on the last day(s) of the
then current Interest Period(s) for Eurodollar Rate Borrowings (or, in the case
of a conversion required by SECTION 4.3 hereof, on such earlier date as such
Lender may specify to Borrower with a copy to Administrative Agent) and, unless
and until such Lender gives notice as provided below that the circumstances
specified in SECTIONS 4.1, 4.2, or 4.3 hereof that gave rise to such conversion
no longer exist:

             (a) to the extent that such Lender's Eurodollar Rate Borrowings
        have been so converted, all payments and prepayments of principal that
        would otherwise be applied to such Lender's Eurodollar Rate Borrowings
        shall be applied instead to its Base Rate Borrowings; and

             (b) all Borrowings that would otherwise be made or continued by

                                       43
<PAGE>
 
 such Lender as Eurodollar Rate Borrowings shall be made or continued instead as
 Base Rate Borrowings, and all Borrowings of such Lender that would otherwise be
 converted into Eurodollar Rate Borrowings shall be converted instead into (or
 shall remain as) Base Rate Borrowings.

If such Lender gives notice to Borrower (with a copy to Administrative Agent)
that the circumstances specified in SECTIONS 4.1, 4.2, or 4.3 hereof that gave
rise to the conversion of such Lender's Eurodollar Rate Borrowings pursuant to
this SECTION 4.4 no longer exist (which such Lender agrees to do promptly upon
such circumstances ceasing to exist) at a time when Eurodollar Rate Borrowings
made by other Lenders are outstanding, such Lender's Base Rate Borrowings shall
be automatically converted, on the first day(s) of the next succeeding Interest
Period(s) for such outstanding Eurodollar Rate Borrowings, to the extent
necessary so that, after giving effect thereto, all Eurodollar Rate Borrowings
held by the Lenders and by such Lender are held pro rata (as to principal
amounts, Types, and Interest Periods) in accordance with their respective
Commitments.

  4.5 COMPENSATION. Upon the request of any Lender, Borrower shall pay to
such Lender such amount or amounts as shall be sufficient (in the reasonable
opinion of such Lender) to compensate it for any loss, cost, or expense
(including loss of anticipated profits) incurred by it as a result of:

      (a) any payment, prepayment, or conversion of a Eurodollar Rate Borrowing
 for any reason (including, without limitation, the acceleration of the loan
 pursuant to SECTION 11.1) on a date other than the last day of the Interest
 Period for such Borrowing; or

      (b) any failure by Borrower for any reason (including, without limitation,
 the failure of any condition precedent specified in SECTION 7.3 to be
 satisfied) to borrow, convert, continue, or prepay a Eurodollar Rate Borrowing
 on the date for such borrowing, conversion, continuation, or prepayment
 specified in the relevant notice of borrowing, prepayment, continuation, or
 conversion under this Agreement.

  4.6  TAXES.

        (a) Any and all payments by Borrower to or for the account of any Lender
 or Administrative Agent hereunder or under any other Loan Paper shall be made
 free and clear of and without deduction for any and all present or future
 Taxes, EXCLUDING, in the case of each Lender and Administrative Agent, Taxes
 imposed on its income and franchise Taxes imposed on it by the jurisdiction
 under the laws of which such Lender (or its Applicable Lending Office) or
 Administrative Agent (as the case may be) is organized or is engaged in
 business, or any political subdivision thereof. If Borrower shall be required
 by law to deduct any Taxes from or in respect of any sum payable under this
 Agreement or any other Loan Paper to any Lender or Administrative Agent, (i)
 the sum payable shall be increased as necessary so that after making all
 required deductions (including deductions applicable to additional sums payable
 under this SECTION 4.6) such Lender or Administrative Agent receives an amount
 equal to the sum it would have received had no such deductions been made, (ii)
 Borrower shall make such deductions,

                                       44
<PAGE>
 
 (iii) Borrower shall pay the full amount deducted to the relevant taxation
 authority or other authority in accordance with applicable law, and (iv)
 Borrower shall furnish to Administrative Agent, within thirty (30) days after
 the date of payment at its address listed in SCHEDULE 2.1, the original or a
 certified copy of a receipt evidencing payment thereof.

      (b) In addition, Borrower agrees to pay any and all present or future
 stamp or documentary taxes and any other excise or property taxes or charges or
 similar levies which arise from any payment made under this Agreement or any
 other Loan Paper or from the execution or delivery of, or otherwise with
 respect to, this Agreement or any other Loan Paper (hereinafter referred to as
 "OTHER TAXES").

      (c) Borrower agrees to indemnify each Lender and Administrative Agent for
 the full amount of Taxes and Other Taxes (including, without limitation, any
 Taxes or Other Taxes imposed or asserted by any jurisdiction on amounts payable
 under this SECTION 4.6) paid by such Lender or Administrative Agent (as the
 case may be) and any liability (including penalties, interest, and expenses)
 arising therefrom or with respect thereto. If as a direct result of a payment
 by the Borrower of Taxes or Other Taxes pursuant to this SECTION 4.6, a Lender
 or Administrative Agent (as the case may be) receives a tax benefit or tax
 savings (by way of a credit against, refund or, or reduction in Taxes or
 similar item), then such Lender or Administrative Agent shall pay to the
 Borrower the net after-tax amount of such credit, refund, reduction or similar
 item.

     (d) Each Lender organized under the laws of a jurisdiction outside the
 United States, on or prior to the date of its execution and delivery of this
 Agreement in the case of each Lender listed on the signature pages hereof and
 on or prior to the date on which it becomes a Lender in the case of each other
 Lender, and from time to time thereafter if requested in writing by Borrower or
 Administrative Agent (but only so long as such Lender remains lawfully able to
 do so), shall provide Borrower and Administrative Agent with (i) INTERNAL
 REVENUE SERVICE FORM 1001 or 4224, as appropriate, or any successor form
 prescribed by the Internal Revenue Service, certifying that such Lender is
 entitled to benefits under an income tax treaty to which the United States is a
 party which reduces the rate of withholding tax on payments of interest or
 certifying that the income receivable pursuant to this Agreement is effectively
 connected with the conduct of a trade or business in the United States, (ii)
 INTERNAL REVENUE SERVICE FORM W-8 or W-9, as appropriate, or any successor form
 prescribed by the Internal Revenue Service, and (iii) any other form or
 certificate required by any taxing authority (including any certificate
 required by SECTIONS 871(H) and 881(C) of the Internal Revenue Code),
 certifying that such Lender is entitled to an exemption from or a reduced rate
 of tax on payments pursuant to this Agreement or any of the other Loan Papers.
 Unless Borrower and Administrative Agent shall have received such forms or
 other documents reasonably satisfactory to them within a reasonable time after
 written request therefor indicating that payments pursuant to this Agreement or
 any of the other Loan Papers are not subject to United States withholding tax
 or are subject to such tax at

                                       45
<PAGE>
 
 a rate reduced by applicable treaty, the Borrower and the Administrative Agent
 shall withhold Taxes from such payments at the applicable statutory rate.

       (e) For any period with respect to which a Lender has failed for any
 reason to provide Borrower and Administrative Agent with any required form
 pursuant to SECTION 4.6(D) certifying that such Lender is totally exempt from
 United States withholding Taxes (including a failure by such Lender to provide
 such forms by reason of its inability to qualify for total exemption from
 United States withholding Taxes or a change in circumstances that renders such
 Lender unable to so qualify, other than a failure due to a change in Law
 occurring subsequent to the date on which a form originally was required to be
 provided), such Lender shall not be entitled to indemnification under SECTION
 4.6(A) or 4.6(B) with respect to Taxes imposed by the United States; PROVIDED,
 HOWEVER, that should a Lender, which is otherwise exempt from or subject to a
 reduced rate of withholding tax, become subject to Taxes or the withholding of
 Taxes by Borrower because of its failure to deliver a form required hereunder,
 Borrower shall take such steps as such Lender shall reasonably request to
 assist such Lender to recover such Taxes.

       (f) If Borrower is required to pay additional amounts to or for the
 account of any Lender pursuant to this SECTION 4.6, then Borrower shall have
 the right to request that such Lender assign its Note and commitment pursuant
 to SECTION 13.13 to an Affiliate who is totally exempt from United States
 withholding taxes, subject to obtaining the consent of such Affiliate, not to
 be unreasonably withheld or in the absence of such an Affiliate or the
 unwillingness of such Lender to so assign its Note and commitment to such an
 Affiliate and at the option of the Borrower, Borrower may require that such
 Lender so assign its Note and commitment to an Eligible Assignee selected by
 the Borrower with the consent of Administrative Agent, which shall not be
 unreasonably withheld. If Borrower does not exercise its option to require such
 assignment, then such Lender will agree to use reasonable efforts to change the
 jurisdiction of its Applicable Lending Office so as to eliminate or reduce any
 such additional payment which may thereafter accrue if such change, in the
 judgment of such Lender, is not otherwise disadvantageous to such Lender.

       (g) Without prejudice to the survival of any other agreement of Borrower
 hereunder, the agreements and obligations of Borrower, Lenders and
 Administrative Agent contained in this SECTION 4.6 shall survive the
 termination of the Revolver Commitment and the payment in full of the Notes.

SECTION 5   FEES.

      5.1 TREATMENT OF FEES. Except as otherwise provided by Law, the fees
described in this SECTION 5: (a) do not constitute compensation for the use,
detention, or forbearance of money, (b) are in addition to, and not in lieu of,
interest and expenses otherwise described in this Agreement, (c) shall be
PAYABLE IN ACCORDANCE with SECTION 3.1 and shall be non-refundable, (d) shall,

                                       46
<PAGE>
 
to the fullest extent permitted by Law, bear interest, if not paid when
due, at the Default Rate, and (e) shall be calculated on the basis of actual
number of days (including the first day but excluding the last day) elapsed, but
computed as if each calendar year consisted of 360 days, unless such computation
would result in interest being computed in excess of the Maximum Rate in which
event such computation shall be made on the basis of a year of 365 or 366 days,
as the case may be.

      5.2 FEES OF ADMINISTRATIVE AGENT AND ARRANGER. Borrower shall pay to
Administrative Agent and NationsBanc Montgomery Securities LLC ("ARRANGER"), as
the case may be, solely for their respective accounts, the fees described in
that certain separate letter agreement dated as of June 2, 1998, between
Borrower, Administrative Agent, and Arranger.

      5.3 LC FEES. Borrower shall pay to Administrative Agent, for the ratable
benefit of Lenders, in accordance with their respective Pro Rata Parts, a fee
for each LC, payable in installments in arrears, SO LONG AS such LC remains
outstanding. Such installments shall be paid for the period from and including
the date of issuance of the applicable LC, to but excluding the next quarterly
payment date (as hereinafter specified), and thereafter for the period from and
including such quarterly payment date to but excluding the next quarterly
payment date or (if earlier) the expiry date of such LC. Such installments shall
be paid on each March 31, June 30, September 30, and December 31. Each such
installment shall be in an amount equal to the product of (a) the Applicable
Margin for Eurodollar Rate Borrowings in effect on the date of payment of such
fee (and applied on a per annum basis) MULTIPLIED BY (b) the face amount of such
LC, and pro rated (in accordance with SECTION 5.1(F)) for the period for which
such installment is due.

      5.4 LC ISSUANCE AND FRONTING FEES. Borrower shall pay Administrative
Agent, as the issuer of LCs and for the individual account of Administrative
Agent, an LC issuance and fronting fee for each LC, payable in installments in
arrears, SO LONG AS such LC remains outstanding. Such installments shall be paid
for the period from and including the date of issuance of the applicable LC, to
but excluding the next quarterly payment date (as hereinafter specified), and
thereafter for the period from and including such quarterly payment date to but
excluding the next quarterly payment date or (if earlier) the expiry date of
such LC. Such installments shall be paid on each March 31, June 30, September
30, and December 31. Each such installment shall be in an amount equal to the
product of (a) 0.125% per annum MULTIPLIED BY (b) the face amount of such LC,
and pro rated (in accordance with SECTION 5.1(F)) for the period for which such
installment is due. In addition, Borrower shall pay to Administrative Agent, for
its individual account, standard administrative charges for LC amendments
provided for in SECTION 2.2(C).

      5.5 REVOLVER FACILITY COMMITMENT FEES. Following the Closing Date,
Borrower shall pay to Administrative Agent, for the ratable account of Lenders,
a commitment fee, payable in installments in arrears, on each March 31, June 30,
September 30, and December 31 and on the Termination Date, commencing June 30,
1998. Each installment shall be, in an amount equal to the Applicable Margin for
Commitment Fees MULTIPLIED BY the amount by which (a) the average daily Revolver
Commitment exceeds (b) the average daily Revolver Commitment Usage, in each case
during the period from and including the last payment date to and excluding the
payment date for such installment; PROVIDED THAT, each

                                       47
<PAGE>
 
such installment shall be calculated in  accordance with SECTION 5.1(F). Solely
for the purposes of this SECTION 5.5  determinations of the average daily
Revolver Commitment Usage shall exclude  the Swing Line Borrowings.

SECTION 6   SECURITY; GUARANTIES.

      6.1 COLLATERAL. To secure full and complete payment and performance of the
Obligation, the Companies and each Guarantor hereby jointly and severally grant
and convey to, and create in favor of Administrative Agent for the ratable
benefit of Lenders, first priority Liens (other than Permitted Liens) in, to,
and on the following items and types of property (collectively, herein called
the "COLLATERAL"), all as more particularly described in the Loan Papers
(PROVIDED THAT, no Agent or any Lender hereby assumes or is made the transferee
of any obligations of any Company or any Guarantor regarding any of the
Collateral):

      (a) All present and future accounts, contract Rights, general intangibles
 (including, without limitation, the Service Agreements), investment property,
 chattel paper, documents, instruments, inventory, equipment, fixtures, money
 and other goods, wherever located, now owned or hereafter acquired by any
 Company or any Guarantor and any and all present and future Tax refunds of any
 kind whatsoever to which any Company or any Guarantor is now or shall hereafter
 become entitled.

      (b) All present and future issued and outstanding shares of capital stock
 or other equity or investment securities now owned or hereafter acquired by any
 Company or any Guarantor, including, without limitation, all capital stock of
 the Subsidiaries of any Company or any Guarantor, together with all
 distributions thereon and any securities issued in substitution or replacement
 thereof.

      (c) All Rights, titles, and interests of any Company in and to all
 promissory notes and other instruments payable to the Companies, now or
 hereafter existing, including, or other inter-company notes, and all Rights in,
 to, and under all other loan and collateral documents relating to such
 instruments.

      (d) All present and future Rights, titles, interests, and Liens (but none
 of the obligations) now owned or hereafter acquired by any Company or any
 Guarantor in any partnership or joint venture.

      (e) The balance of every deposit account of any Company or any Guarantor
 and any other claim of any Company or any Guarantor against any depository, now
 or hereafter existing, whether liquidated or unliquidated, including, without
 limitation, certificates of deposit, and other deposit instruments.

      (f) All present and future automobiles, trucks, truck tractors, trailers,
 semi-trailers, other motor vehicles or rolling stock now owned or hereafter
 acquired by any Company or any Guarantor (collectively, the "VEHICLES").

      (g) All present and future Rights, awards, and judgments to which

                                       48
<PAGE>
 
 any Company or Guarantor is entitled under any Litigation (whether
 arising in equity, contract, or tort) now existing or hereafter arising.

      (h) All present and future Rights (including, without limitation, the
 Right to sue for past, present, or future infringements), titles, and interests
 of any Company or any Guarantor in and to all trademark applications,
 trademarks, corporate names, company names, tradenames, business names,
 fictitious business names, tradestyles, service marks, logos, other source of
 business identifiers, copyrights, designs, Rights or licenses to use any
 trademarks, and all registrations and recordings thereof, including without
 limitation, the trademark and service mark of "WORKWELL" and "WORKWELL AND
 DESIGN" and the marks "INTEGRATED ORTHOPAEDICS," "IOI", "INTEGRATED
 ORTHOPAEDIC AND DESIGN", AND "IOI and DESIGN" (collectively, the "TRADEMARKS"),
 and the goodwill of each business to which each Trademark relates.

      (i) All present and future Rights (including, without limitation, the
 Right to sue for past, present, and future infringements), titles, and
 interests of any Company or any Guarantor in and to all patents, patent
 applications, utility models, industrial models, designs, and any other forms
 of industrial intellectual property, including all grants, applications,
 reissues, continuations, and divisions with respect thereto and any Rights to
 use, manufacture, or sell any patent.

      (j) All present and future increases, profits, combinations,
 reclassifications, improvements, and products of, accessions, attachments, and
 other additions to, tools, parts, and equipment used in connection with, and
 substitutes and replacements for, all or part of the Collateral heretofore
 described.

      (k) All present and future accounts, contract Rights, general intangibles,
 chattel paper, documents, instruments, cash and noncash proceeds, and other
 Rights arising from or by virtue of, or from the voluntary or involuntary sale
 or other disposition of, or collections with respect to, or insurance proceeds
 payable with respect to, or proceeds payable by virtue of warranty or other
 claims against the manufacturer of, or claims against any other Person with
 respect to, all or any part of the Collateral heretofore described in this
 CLAUSE or otherwise.

      (1) All present and future security for the payment to any Company or any
 Guarantor of any of the Collateral heretofore described and goods which gave or
 will give rise to any of such Collateral or are evidenced, identified, or
 represented therein or thereby.

 6.2 GUARANTIES. As an inducement to Agents and Lenders to enter into this
Agreement, Borrower shall cause each other Company to execute and deliver to
Administrative Agent a Guaranty substantially in the form and upon the terms of
EXHIBIT C, providing for the guarantee of payment and performance of the
Obligation.

 6.3    FUTURE LIENS.  Promptly after (a) the  acquisition  of any assets
(personal, tangible, or   intangible other  than assets described   in

                                       49
<PAGE>
 
SECTIONS 6.1(E) and (F) or specific easements, licenses, permits, certificates
of compliance, and certificates of approval issued by regulatory authorities, or
franchises, or any real property interests of any Company, including without
limitation, fixtures, and leasehold interests (collectively, the "INITIALLY
UNPERFECTED ASSETS")) by any Company or any Guarantor, (b) the removal,
termination, or expiration of any prohibitions upon the granting of a Lien in
any asset other than the Initially Unperfected Assets (real, personal, tangible,
or intangible) of any Company or any Guarantor, or (c) upon the designation,
formation, or acquisition of any new Subsidiary (the assets and stock of such
new Subsidiary and the assets described in CLAUSES (A) and (B) hereof are
referred to herein as the "ADDITIONAL ASSETS"), Borrower shall (or shall cause
such other Company or Guarantor to) execute and deliver to Administrative Agent
all further instruments and documents (including, without limitation, Collateral
Documents and all certificates and instruments representing shares of stock or
evidencing Debt as Administrative Agent may require with respect to any such
Additional Assets other than the Initially Unperfected Assets), and shall take
all further action that may be necessary or desirable, or that Administrative
Agent may reasonably request, to grant, perfect, and protect Liens in favor of
Administrative Agent for the benefit of Lenders in such Additional Assets, as
security for the Obligation; IT BEING EXPRESSLY UNDERSTOOD that the granting of
such additional security for the Obligation is a material inducement to the
execution and delivery of this Agreement by each Lender. Upon satisfying the
terms and conditions hereof, such Additional Assets shall be included in the
"COLLATERAL" for all purposes under the Loan Papers, and all references to the
"COLLATERAL" in the Loan Papers shall include the Additional Assets.

      6.4 RELEASE OF COLLATERAL. Upon any sale, transfer, or disposition of
Collateral which is expressly permitted pursuant to the Loan Papers (or is
otherwise authorized by Required Lenders or Lenders, as the case may be), and
upon ten (10) Business Days' prior written request by Borrower (which request
must be accompanied by true and correct copies of (a) all documents of transfer
or disposition, including any contract of sale, (b) a preliminary closing
statement and instructions to the title company, if any, and (c) all requested
release instruments), Administrative Agent shall (and is hereby irrevocably
authorized by the Lenders to) execute such documents as may be necessary to
evidence the release of Liens granted to Administrative Agent for the benefit of
Lenders pursuant hereto in such Collateral; PROVIDED THAT, (i) no such release
of Lien shall be granted if any Default or Potential Default has occurred and is
continuing; (ii) Administrative Agent shall not be required to execute any such
document on terms which, in Administrative Agent's opinion, would expose
Administrative Agent to liability or create any obligation or entail any
consequence OTHER THAN the release of such Liens without recourse or warranty;
and (iii) such release shall not in any manner discharge, affect, or impair the
Obligation or Liens upon (or obligations of any Company or any Guarantor in
respect of) all interests retained by the Companies and the Guarantors,
including (without limitation) the proceeds of any sale, all of which shall
continue to constitute Collateral.

     6.5 NEGATIVE PLEDGE. Notwithstanding the provisions of SECTION 6.1 and 6.3
hereof, until such time as Administrative Agent or Required Lenders deem
themselves insecure, the Companies and the Guarantors shall not be required to
perfect Liens on any Initially Unperfected Assets. To the extent Administrative
Agent and Required Lenders agree to not require the granting of

                                       50
<PAGE>
 
a lien in any real property or real property leasehold interests or to delay the
perfection or attachment of any Lien granted pursuant to SECTION 6.1(E) and (F)
hereof, for whatever reason, the Companies and the Guarantors hereby covenant
and agree not to directly create, incur, grant, suffer, or permit to be created
or incurred any Lien on any such assets, OTHER THAN Permitted Liens, or to grant
any other Person a negative pledge with respect to any such assets. Furthermore,
within thirty (30) days of the request of Administrative Agent, upon
Administrative Agent or Required Lenders deeming themselves insecure, Borrower
shall (or shall cause each Company and each Guarantor to) execute and deliver to
Administrative Agent all instruments and documents (including, without
limitation, certificates and instruments and documents representing shares of
stock or evidencing Debt) and shall take all further action that may be
necessary or desirable, or that Administrative Agent may reasonably request, to
grant, perfect, and protect Liens in favor of Administrative Agent for the
benefit of Lenders, in such assets, as security for the Obligation; IT BEING
EXPRESSLY UNDERSTOOD that the provisions of this negative pledge are a material
inducement to the execution and delivery of this Agreement by each Lender.

      6.6 IOI MANAGEMENT SERVICES OF PENNSYLVANIA, INC. Until IOI Management
Services of Pennsylvania, Inc. ("IOI PENNSYLVANIA") becomes a Wholly-Owned
Subsidiary, Borrower shall only be required to pledge and grant security
interests to Administrative Agent for the benefit of the Lenders in eighty-five
and seventy-one hundredths percent (85.71%) of the issued and outstanding
capital stock of IOI Pennsylvania pursuant to the Collateral Documents. Borrower
agrees to cause IOI Pennsylvania to become a Wholly-owned Subsidiary, and prior
to the Initial Borrowing hereunder, to pledge and grant a security interest in
the remaining fourteen and twenty-nine hundredths percent (14.29%) of the issued
and outstanding capital stock of IOI Pennsylvania, and to take all steps
necessary or requested by Administrative Agent to perfect such security
interests therein.

      6.7 CONTROL; LIMITATION OF RIGHTS. Notwithstanding anything herein or in
any other Loan Paper to the contrary, the transactions contemplated hereby do
not and will not constitute, create, or have the effect of constituting or
creating, directly or indirectly, actual or practical ownership of the Companies
or the Guarantors by Agent or Lenders, or control, affirmative or negative,
direct or indirect, by Agent or Lenders over the management or any other aspect
of the operation of the Companies or the Guarantors, which ownership or control
remains exclusively and at all times in the Companies or the Guarantors.

SECTION 7   CONDITIONS PRECEDENT.

       7.1 CONDITIONS PRECEDENT TO CLOSING. This Agreement shall not become
effective, and Lenders shall not be obligated to advance any Borrowing or issue
any LC, unless Administrative Agent has received all of the agreements,
documents, instruments, and other items described on SCHEDULE 7.1 (OTHER THAN
each item listed on SCHEDULE 7.1A, which items are hereby permitted to be
delivered after the Closing Date, but not later than the date of the Initial
Borrowing).

       7.2  CONDITIONS PRECEDENT TO A PERMITTED ACQUISITION. On or prior to the
consummation of any Acquisition (whether or not the purchase price for such

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<PAGE>
 
Acquisition is funded by Borrowings), Borrower shall have satisfied the
conditions and delivered, or caused to be delivered, to Administrative Agent,
all documents and certificates set forth on SCHEDULE 7.2 by no later than the
dates specified for satisfaction of such conditions on SCHEDULE 7.2. Promptly
upon receipt of each Permitted Acquisition Compliance Certificate,
Administrative Agent shall provide copies of such certificates to Lenders. All
documentation delivered and satisfaction of conditions pursuant to the
requirements of SECTION 7.2 must be reasonably satisfactory to Administrative
Agent, except for the acquisition documents referred to in clause (a)(iii) of
the definition of Permitted Acquisition, which shall be in the form and
delivered within the time periods specified therein. To the extent any Borrowing
is being requested in connection with the consummation of the Acquisition, the
conditions set forth in SECTIONS 7.2 and 7.3 hereof must be satisfied prior to
the making of any such Borrowing.

      7.3 CONDITIONS PRECEDENT TO EACH BORROWING. In addition to the conditions
stated in SECTION 7.1 and SECTION 7.2, Lenders will not be obligated to fund (as
opposed to continue or convert) any Borrowing, and Administrative Agent will not
be obligated to issue any LC, as the case may be, unless on the date of such
Borrowing or issuance (and after giving effect thereto), as the case may be: (a)
Administrative Agent shall have timely received therefor a Notice of Borrowing
or a Notice of LC (together with the applicable LC Agreement), as the case may
be; (b) all of the representations and warranties of any Company or any
Guarantor set forth in the Loan Papers are true and correct in all material
respects (except to the extent that (i) the representations and warranties speak
to a specific date or (ii) the facts on which such representations and
warranties are based have been changed by transactions contemplated or permitted
by the Loan Papers); (c) no Material Adverse Event shall have occurred; (d) no
Default or Potential Default shall have occurred and be continuing; (e) the
funding of such Borrowings and issuance of such LC, as the case may be, is
permitted by Law; and (f) upon the reasonable request of Administrative Agent,
Borrower shall deliver to Administrative Agent evidence substantiating any of
the matters in the Loan Papers which are necessary to enable Borrower to qualify
for such Borrowing. Each Notice of Borrowing and LC Agreement delivered to
Administrative Agent shall constitute the representation and warranty by
Borrower to Administrative Agent that the statements above are true and correct
in all respects. Each condition precedent in this Agreement is material to the
transactions contemplated in this Agreement, and time is of the essence in
respect of each thereof. Subject to the prior approval of Required Lenders,
Lenders may fund any Borrowing, and Administrative Agent may issue any LC,
without all conditions being satisfied, but, to the extent permitted by Law, the
same shall not be deemed to be a waiver of the requirement that each such
condition precedent be satisfied as a prerequisite for any subsequent funding or
issuance, unless Required Lenders specifically waive each such item in writing.

      7.4 ADDITIONAL CONDITIONS PRECEDENT TO INITIAL BORROWING. In addition to
the conditions stated in SECTION 7.1, SECTION 7.2, SECTION 7.3, and SECTION 7.5,
Lenders shall not be obligated to fund the Initial Borrowing unless on the date
of such Initial Borrowing, Administrative Agent has received all of the
agreements, documents, instruments, and other items described on SCHEDULE 7.1A.

      7.5 ADDITIONAL CONDITION PRECEDENT TO CERTAIN BORROWINGS. In

                                       52
<PAGE>
 
addition to the requirements stated in SECTION 7.1, SECTION 7.3, and SECTION
7.4, Lenders shall not be obligated to fund (as opposed to continue or convert)
any Borrowing during the first six months following the date hereof if the
proceeds of such Borrowing are to be used for any purpose other than to finance
a Permitted Acquisition, unless Borrower delivers to Administrative Agent a
certificate demonstrating pro forma compliance with SECTION 9.30(A) after giving
effect to such Borrowing.

SECTION 8 REPRESENTATIONS AND WARRANTIES. Borrower, each other Company, and each
Guarantor represent and warrant to Administrative Agent and Lenders as follows:

      8.1 PURPOSE OF CREDIT FACILITY. Borrower will use (or will loan such
proceeds to its Companies to so use) all proceeds of Borrowings for one or more
of the following: (a) to finance the Permitted Acquisitions; and (b) to finance
Capital Expenditures, for working capital and for general corporate purposes up
to the Maximum Working Capital Commitment. No Company or Guarantor is engaged
principally, or as one of its important activities, in the business of extending
credit for the purpose of purchasing or carrying any "MARGIN STOCK" within the
meaning of REGULATION U. No part of the proceeds of any Borrowing will be used,
directly or indirectly, for a purpose which violates any Law, including, without
limitation, the provisions of REGULATIONS G, T, U, or X (as enacted by the Board
of Governors of the Federal Reserve System, as amended).

      8.2   EXISTENCE, GOOD STANDING, AUTHORITY, AND AUTHORIZATIONS.

      (a) Each Company and Guarantor is duly organized, validly existing, and in
 good standing under the Laws of its jurisdiction of organization (such
 jurisdictions being identified on SCHEDULE 8.2, as supplemented and modified in
 writing from time to time to reflect any changes to such Schedule as a result
 of transactions permitted by the Loan Papers). Each Company is duly qualified
 to transact business and is in good standing in each jurisdiction where the
 nature and extent of its business and properties require the same, except to
 the extent the failure to qualify would not be a Material Adverse Event. Each
 of Borrower, the Guarantors, and the Companies possesses all the
 Authorizations, franchises, permits, licenses, certificates of compliance, and
 approvals and grants of authority necessary or required in the conduct of its
 respective business(es), and the same are valid, binding, enforceable, and
 subsisting without any defaults thereunder or enforceable adverse limitations
 thereon and are not subject to any proceedings or claims opposing the issuance,
 development, or use thereof or contesting the validity thereof, except to the
 extent the failure to possess same would not be a Material Adverse Event. No
 authorization, consent, approval, waiver, license, or formal exemptions from,
 nor any filing, declaration, or registration with, any Governmental Authority
 (federal, state, or local), or non-governmental entity, under the terms of
 contracts or otherwise, is required by reason of or in connection with the
 execution and performance of the Loan Papers by Borrower, the Guarantors, and
 the Companies.

       (b)  To  Borrower's    knowledge,  each Managed  Practice  has all

                                       53
<PAGE>
 
      licenses, permits, consents or approvals from or by, and has made all
      filings with, and has given all notices to, all Governmental Authorities
      having jurisdiction, to the extent required for the ownership of its
      property and the operation and conduct of its business (including, as
      applicable, accreditations, licenses and certifications as a provider of
      health care services including those necessary for it to be eligible to
      receive payment and compensation and to participate under Medicare,
      Medicaid, CHAMPUS, CHAMPVA, or any Blue Cross/Blue Shield or equivalent
      program) and is in compliance with all of the foregoing and all applicable
      laws relating to its business, except, in each case, to the extent that
      the failure to have such licenses, permits, consents or approvals or to
      make such filings or give such notices or to be in such compliance,
      individually or in the aggregate, has not had and could not reasonably be
      expected to have or result in a Material Adverse Event.

      8.3 SUBSIDIARIES; CAPITAL STOCK. The Companies and Guarantors have no
      Subsidiaries except as disclosed on SCHEDULE 8.3 (as supplemented and
      modified in writing from time to time to reflect any changes to such
      Schedule as a result of transactions permitted by the Loan Papers). All of
      the outstanding shares of capital stock (or similar voting interests) of
      each Subsidiary are duly authorized, validly issued, fully paid, and
      nonassessable and are owned of record and beneficially as set forth on
      SCHEDULE 8.3 (as supplemented and modified in writing from time to time to
      reflect any changes to such Schedule as a result of transactions permitted
      by the Loan Papers), free and clear of any Liens, restrictions, claims, or
      Rights of another Person, other than Permitted Liens, and none of such
      shares owned by any Company or Guarantor is subject to any restriction on
      transfer thereof except for restrictions imposed by securities Laws and
      general corporate Laws. No Company OR Guarantor has outstanding any
      warrant, option, or other Right of any Person to acquire any of its
      capital stock or similar equity interests.

      8.4   AUTHORIZATION AND CONTRAVENTION.

            (a) The execution and delivery by each Company and Guarantor of each
      Loan Paper to which it is a party and the performance by such Company and
      Guarantor of its obligations thereunder (a) are within the corporate power
      of such Company or Guarantor, (b) will have been duly authorized by all
      necessary corporate or partnership action on the part of such Company or
      Guarantor when such Loan Paper is executed and delivered, (c) require no
      action by or in respect of, or filing with, any Governmental Authority,
      which action or filing has not been taken or made on or prior to the
      Closing Date (or if later, the date of execution and delivery of such Loan
      Paper), (d) will not violate any provision of the charter, bylaws, or
      partnership agreement of such Company or Guarantor, (e) will not violate
      any provision of Law applicable to it, other than such violations which
      individually or collectively could not be a Material Adverse Event, (f)
      will not violate any material written or oral agreements, contracts,
      commitments, or understandings to which it is a party, other than such
      violations which could not be a Material Adverse Event, or (g) will not
      result in the creation or imposition of any Lien on any asset of any
      Company or Guarantor. The Companies and Guarantors have (or will have upon
      consummation thereof) all necessary consents and approvals of any

                                       54
<PAGE>
 
 Person or Governmental Authority required to be obtained in order to effect any
 asset transfer, change of control, merger, or consolidations permitted by the
 Loan Papers.

       (b) Each Service Agreement, and each of the transactions contemplated
 thereunder does not violate any applicable rule or regulation: (i) relating to
 the eligibility of a Managed Practice to receive payment and to participate as
 an accredited and certified provider of health care services under Medicare,
 Medicaid, CHAMPUS, CHAMPVA or any Blue Cross/Blue Shield or equivalent program,
 (ii) applicable to such Person as a result of its participation in such
 programs, (iii) relating to the licenses and permits required therein in
 connection therewith, or (iv) relating to the practice of medicine or the
 sharing of fees generated in connection therewith; except in each case ((I),
 (II), (III) and (IV)), for such violations, as individually or in the aggregate
 with all such events, have not had and could not reasonably be expected to have
 or result in a Material Adverse Event.

      8.5 BINDING EFFECT. Upon execution and delivery by all parties thereto,
each Loan Paper will constitute a legal, valid, and binding obligation of each
Company and each Guarantor party thereto, enforceable against each such Company
or Guarantor in accordance with its terms, except as enforceability may be
limited by applicable Debtor Relief Laws and general principles of equity.

      8.6 FINANCIAL STATEMENTS. The Current Financials were prepared in
accordance with GAAP and present fairly, in all material respects, the
consolidated financial condition, results of operations, and cash flows of the
Companies as of and for the portion of the fiscal year ending on the date or
dates thereof (subject only to normal year-end audit adjustments). There were no
material liabilities, direct or indirect, fixed or contingent, of the Companies
as of the date or dates of the Current Financials which are required under GAAP
to be reflected therein or in the notes thereto, and are not so reflected.
Except for transactions directly related to, or specifically contemplated by,
the Loan Papers, there have been no changes in the consolidated financial
condition of the Companies from that shown in the Current Financials after such
date which could be a Material Adverse Event, nor has Borrower or any Company
incurred any liability (including, without limitation, any liability under any
Environmental Law), direct or indirect, fixed or contingent, after such date
which could be a Material Adverse Event.

      8.7 LITIGATION, CLAIMS, INVESTIGATIONS. No Company or Guarantor is subject
to, or aware of the threat of, any Litigation which is reasonably likely to be
determined adversely to any Company, any Guarantor, or any Managed Practice,
and, if so adversely determined, could (individually or collectively with other
Litigation) be a Material Adverse Event. There are no outstanding orders or
judgments for the payment of money in excess of $1,000,000 (individually or
collectively) or any warrant of attachment, sequestration, or similar proceeding
against the assets of any Company or Guarantor having a value (individually or
collectively) of $1,000,000 or more which is not either (a) stayed on appeal or
(b) being diligently contested in good faith by appropriate proceedings and
adequate reserves have been set aside on the books of such Company in accordance
with GAAP. There are no formal complaints, suits, claims, investigations, or
proceedings initiated at or by HCFA or any

                                       55
<PAGE>
 
Governmental Authority pending or to Borrower's knowledge, threatened by or
against any Company, Guarantor, or Managed Practice which could be a Material
Adverse Event, nor any judgments, decrees, or orders of any Governmental
Authority outstanding against any Company, any Guarantor, or Managed Practice
that could be a Material Adverse Event. No criminal, civil or administrative
action, audit, or investigation by a fiscal intermediary or by or on behalf of
any Governmental Authority exists or to Borrower's knowledge, is threatened with
respect to any of the Borrower, any of its Subsidiaries, or any Managed
Practice, which has had or could reasonably be expected to have or result in a
Material Adverse Event (including by way of an adverse effect on such Person's
right to receive Medicare, Medicaid, CHAMPUS, or CHAMPVA reimbursement to which
such Person would otherwise be entitled, or right to participate in the
Medicare, Medicaid, CHAMPUS, or CHAMPVA programs or on the ability of such
Person to engage in the practice of medicine or to fulfill its obligations as
contemplated under the Loan Papers or any Service Agreement), and no such Person
is subject to any pending but unassessed Medicare, Medicaid, CHAMPUS, or CHAMPVA
claim payment adjustments, except to the extent that such Person is contesting
such assessment in good faith by appropriate proceedings diligently pursued and
has established and will maintain adequate reserves for such adjustments in
accordance with GAAP, except to the extent that any such payment adjustment,
individually or in the aggregate, has not had and could not reasonably be
expected to have or result in a Material Adverse Event.

      8.8 TAXES. All Tax returns of each Company and Guarantor required to be
filed have been filed (or extensions have been granted) prior to delinquency,
except for any such returns for which the failure to so file could not be a
Material Adverse Event, and all Taxes imposed upon each Company or Guarantor
which are due and payable have been paid prior to delinquency except for those
the applicability, amount or validity of which are being contested in good faith
by lawful proceedings being diligently conducted and against which reserve or
other provision has been made and in respect of which levy and execution of any
lien securing same have been and continue to be stayed.

      8.9 ENVIRONMENTAL MATTERS. No Company or Guarantor after appropriate
inquiry (a) knows of any environmental condition or circumstance, such as the
presence or Release of any Hazardous Substance, on any property presently or
previously owned by any Company or any Guarantor that could be a Material
Adverse Event, (b) knows of any violation by any Company or any Guarantor of any
Environmental Law, except for such violations that could not be a Material
Adverse Event, or (c) knows that any Company or any Guarantor is under any
obligation to remedy any violation of any Environmental Law, except for such
obligations that could not be a Material Adverse Event; PROVIDED, HOWEVER, that
each Company and each Guarantor to the best of its knowledge, has in full force
and effect all environmental permits, licenses, and approvals required to
conduct its operations and is operating in substantial compliance thereunder.

      8.10 EMPLOYEE BENEFIT PLANS. (a) No Employee Plan has incurred an
accumulated funding deficiency, as defined in SECTION 302 of ERISA and
SECTION 412 of the Code, (b) neither Borrower nor any ERISA Affiliate has
incurred material liability which is currently due and remains unpaid under
TITLE IV of ERISA to the PBGC or to an Employee Plan in connection with any such
Employee Plan, (c) neither Borrower nor any ERISA Affiliate has had a complete
or partial withdrawal from a Multiemployer Plan, (d) Borrower has not engaged in
any "PROHIBITED TRANSACTION" (as defined in SECTION 406 of ERISA or

                                       56
<PAGE>
 
SECTION 4975 of the Code) which would result in a Material Adverse Event, and
(e) no Reportable Event has occurred which is likely to result in the
termination of an Employee Plan. The present value of all benefit liabilities
within the meaning of TITLE IV of ERISA under each Employee Plan (based on those
actuarial assumptions used to fund such Employee Plan) did not, as of the last
annual valuation date for the 1997 plan year of such Plan, exceed the value of
the assets of such Employee Plan, and the total present values of all benefit
liabilities within the meaning of TITLE IV of ERISA of all Employee Plans (based
on the actuarial assumptions used to fund each such Plan) did not, as of the
respective annual valuation dates for the 1997 plan year of each such Plan,
exceed the value of the assets of all such plans.

      8.11 PROPERTIES; LIENS. Each Company and each Guarantor has good and
marketable title to all its property reflected on the Current Financials, EXCEPT
(a) for (i) property that is obsolete, (ii) property that has been disposed of
in the ordinary course of business, or (iii) property with title defects or
failures in title which would not be a Material Adverse Event, or (b) as
otherwise permitted by the Loan Papers. Except for Permitted Liens, there is no
Lien on any property of any Company or any Guarantor, and the execution,
delivery, performance, or observance of the Loan Papers will not require or
result in the creation of any Lien on such property, other than the Liens
created under the Loan Papers.

      8.12 GOVERNMENT REGULATIONS. No Company or Guarantor is subject to
regulation under the INVESTMENT COMPANY ACT OF 1940, as amended, the PUBLIC
UTILITY HOLDING COMPANY ACT OF 1935, as amended, or any other Law (other than
REGULATIONS G, T, U, and X of the Board of Governors of the Federal Reserve
System) which regulates the incurrence of Debt.

      8.13 TRANSACTIONS WITH AFFILIATES. No Company or Guarantor is a party to a
material transaction with any of its Affiliates (excluding transactions between
or among Companies), other than transactions in the ordinary course of business
and upon fair and reasonable terms not materially less favorable than such
Company could obtain or could become entitled to in an arm's-length transaction
with a Person that was not its Affiliate, and the transactions described on
SCHEDULE 8.13 hereto.

      8.14  DEBT. No Company or Guarantor is an obligor on any Debt other than
Permitted Debt.

      8.15 MATERIAL AGREEMENTS; MANAGEMENT AGREEMENTS. SCHEDULE 8.15 hereto sets
forth a list of all contracts material to the respective business of the
Companies and the Guarantors. There are no failures of any material written or
oral agreements, contracts, commitments, or understandings to which any Company
or Guarantor is a party to be in full force and effect which could be a Material
Adverse Event, and no default or potential default exists on the part of any
Company or any Guarantor thereunder which could be a Material Adverse Event.
None of Borrower, the Guarantors, or the Companies is a party to any management
or consulting agreement for the provision of services to it, except as described
in SCHEDULE 8.15 hereto.

      8.16 INSURANCE. Each Company and each Guarantor maintains, with
financially sound, responsible, and reputable insurance companies or
associations, insurance concerning its properties and businesses against such

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<PAGE>
 
casualties and contingencies and of such types and in  such  amounts  (and with
co-insurance and deductibles)  as is customary in the case of same or similar
businesses.

      8.17 LABOR MATTERS. To Borrower's knowledge, there are no actual or
threatened strikes, labor disputes, slow downs, walkouts, or other concerted
interruptions of operations by the employees of any Company or any Guarantor
that could be a Material Adverse Event. Hours worked by and payment made to
employees of the Companies and the Guarantors have not been in violation of the
FAIR LABOR STANDARDS ACT or any other applicable Law dealing with such matters,
other than any such violations, individually or collectively, which could not
constitute a Material Adverse Event. All payments due from any Company or any
Guarantor on account of employee health and welfare insurance have been paid or
accrued as a liability on its books, other than any such nonpayments which could
not, individually or collectively, constitute a Material Adverse Event.

      8.18 SOLVENCY. At the time of each Borrowing hereunder and on the date of
each Permitted Acquisition, each Company and each Guarantor is (and after giving
effect to the transactions contemplated by the Loan Papers, any Permitted
Acquisition, and any incurrence of additional Debt, will be) Solvent.

      8.19 INTELLECTUAL PROPERTY. Each Company and each Guarantor owns or has
sufficient and legally enforceable rights to use all material licenses, patents,
patent applications, copyrights, service marks, trademarks, trademark
applications, and trade names necessary to continue to conduct its businesses as
heretofore conducted by it, now conducted by it, and now proposed to be
conducted by it. Each Company and each Guarantor is conducting its business
without infringement or claim of infringement of any license, patent, copyright,
service mark, trademark, trade name, trade secret, or other intellectual
property right of others, other than any such infringements or claims which, if
successfully asserted against or determined adversely to any Company or any
Guarantor, could not, individually or collectively, constitute a Material
Adverse Event.

      8.20 COMPLIANCE WITH LAWS. No Company or Guarantor is in violation of any
Laws, other than such violations which could not, individually or collectively,
be a Material Adverse Event. No Company or Guarantor has received notice
alleging any noncompliance with any Laws, except for such noncompliance which no
longer exists, or which could not constitute a Material Adverse Event.

      8.21  PERMITTED ACQUISITIONS.

      (a) VALIDITY. With respect to any Permitted Acquisitions, each of
 Borrower, the Companies, and the Guarantors has the power and authority under
 the Laws of its state of incorporation and under its articles of incorporation
 and bylaws, to enter into and perform the related Acquisition agreement to
 which it is a party and all other agreements, documents, and actions required
 thereunder; and all actions (corporate or otherwise) necessary or appropriate
 by Borrower, the Companies, or the Guarantors (as the case may be) for the
 execution and performance of said Acquisition agreements, and all other
 documents, agreements, and actions required thereunder, have been taken, and,
 upon their execution, such Acquisition agreements will constitute the valid

                                       58
<PAGE>
 
 and binding obligation of Borrower, the Companies, and the Guarantors,
 as the case may be, enforceable in accordance with their respective terms.

      (b) NO VIOLATIONS. With respect to any Permitted Acquisition, the making
 and performance of the related Acquisition Agreements, and all other
 agreements, documents, and actions required thereunder, will not violate any
 provision of any Law, including, without limitation, all state corporate Laws
 and judicial precedents of the states of incorporation or formation of
 Borrower, the Companies, and the Guarantors, and will not violate any
 provisions of the articles of incorporation and bylaws of Borrower, the
 Companies, or the Guarantors, or constitute a default under any agreement by
 which Borrower, the Companies, or the Guarantors or their respective property
 may be bound, except to the extent the same would not be a Material Adverse
 Event.

      8.22 REGULATION U. "MARGIN STOCK" (as defined in REGULATION U) constitutes
less than 25% of those assets of the Companies or the Guarantors which are
subject to any limitation on sale, pledge, or other restrictions hereunder.

      8.23 TRADENAME. No Company or Guarantor has used or transacted business
under any other corporate or trade name in the five-year period preceding the
date hereof, except that Borrower changed its name in 1997 from "DRCA MEDICAL
CORPORATION" to "INTEGRATED ORTHOPAEDICS, INC." and except as disclosed on Annex
A of the Collateral Documents listed as ITEM 11 on SCHEDULE 7.1 hereto.

      8.24 FULL DISCLOSURE. There is no material fact or condition relating to
the Loan Papers or the financial condition, business, or property of any Company
or any Guarantor which could be a Material Adverse Event and which has not been
related, in writing, to Administrative Agent. All information heretofore
furnished by any Company or any Guarantor to any Lender or Administrative Agent
in connection with the Loan Papers was, and all such information hereafter
furnished by any Company or any Guarantor to any Lender or Administrative Agent
will be, true and accurate in all material respects or based on reasonable
estimates on the date as of which such information is stated or certified.

      8.25 THIRD PARTY REIMBURSEMENT. If the Borrower, any Subsidiary, or any
Managed Practice is or has been audited by Medicare, Medicaid, CHAMPUS, CHAMPVA
or similar governmental Third Party Payors, to the Borrower's knowledge, (a)
none of such audits provides for adjustments in reimbursable costs or asserts
claims for reimbursement or repayment by such Person of costs and/or payments
theretofore made by such governmental Third Party Payor that, if adversely
determined, individually or in the aggregate, could reasonably be expected to
have or result in a Material Adverse Event and (b) no Managed Practice has had
requests or assertions of claims for reimbursement or repayment by it of costs
and/or payments heretofore made by any other Third Party Payor that, if
adversely determined, individually or in the aggregate, could reasonably be
expected to have or result in a Material Adverse Event.

      8.26 REHABILITATION  CORPORATION  OF   AMERICA.    Rehabilitation
Corporation of America has no assets, no active business,  and  no   liabilities

                                       59
<PAGE>
 
other than potential franchise tax liabilities.

SECTION 9   COVENANTS. Borrower and each Guarantor covenant and agree (and
agree to cause their ERISA Affiliates with respect to SECTION 9.10) to perform,
observe, and comply with each of the following covenants, from the Closing Date
and SO LONG THEREAFTER AS Lenders are committed to fund Borrowings and
Administrative Agent is committed to issue LCs under this Agreement and
thereafter until the payment in full of the Principal Debt (and termination of
outstanding LCs, if any) and payment in full of all other interest, fees, and
other amounts of the Obligation then due and owing, UNLESS Borrower receives a
prior written consent to the contrary by Administrative Agent as authorized by
Required Lenders:

      9.1   USE OF PROCEEDS. Borrower shall use the proceeds of Borrowings only
for the purposes represented herein.

      9.2 BOOKS AND RECORDS. The Companies and Guarantors shall maintain books,
records, and accounts necessary to prepare financial statements in accordance
with GAAP.

      9.3   ITEMS TO BE FURNISHED. Borrower shall cause the following to be
furnished to Administrative Agent for delivery to Lenders:

      (a) Promptly after preparation, and no later than 90 days after the last
 day of each fiscal year of Borrower, Financial Statements showing the
 consolidated and consolidating financial condition and results of operations
 calculated separately for each of the Companies as of, and for the year ended
 on, such day, each accompanied by:

           (i) with respect to the consolidated Financial Statements of the
      Companies, the unqualified opinion of a firm of nationally-recognized
      independent certified public accountants, based on an audit using
      generally accepted auditing standards, that such Financial Statements were
      prepared in accordance with GAAP and present fairly in all material
      respects the consolidated financial position and results of operations of
      the Companies;

           (ii) a copy of any management letter prepared by such accounting
      firm;

           (iii) with respect to the consolidated Financial Statements of the
      Companies, a certificate from such accounting firm to Administrative Agent
      indicating that during its audit it obtained no knowledge of any Default
      or Potential Default or, if it obtained such knowledge, the nature and
      period of existence thereof; PROVIDED that such accounting firm shall
      deliver such certificate only with respect to the applicable Fiscal Year
      end, and may exclude any reference to SECTION 9.30(A);

           (iv) a letter from such accounting firm addressed to Borrower, with a
      copy to Administrative Agent, acknowledging that (A) Borrower plans to
      provide Administrative Agent with the Fiscal Year 1998 audited Financial
      Statements and accompanying

                                       60
<PAGE>
 
      audit report, (B) Administrative Agent has informed Borrower that
      Administrative Agent and Lenders intend to rely on such firm's audit
      report accompanying such Financial Statements, and (C) Borrower intends
      for Administrative Agent and Lenders to so rely; and

        (v) with respect to the Financial Statements of the Companies, a
      Compliance Certificate.

      (b) Promptly after preparation, and no later than 45 days after the last
   day of the first three fiscal quarters of Borrower:

        (i)  Financial Statements showing the consolidated and
             consolidating financial condition and results of
             operations for the Companies;

        (ii) an operating analysis in the form of a managements'
             discussion and analysis of the results of operations for:

             (A) the Companies on a consolidated basis, and

             (B) the Managed Practices, at a level of
                 organizational detail as may be reasonably
                 requested by the Administrative Agent and
                 Lenders given the then-current magnitude and
                 organization of the Companies and Managed
                 Practices, in such a manner as to allow for the
                 comparison of the financial performance of
                 Managed Practices from period to period;

in each case for such fiscal quarter and for the period from the beginning of
the then-current fiscal year to the last day of such fiscal quarter and
accompanied by a Compliance Certificate with respect to such Financial
Statements.

      (c) On or prior to March 31 of each fiscal year of Borrower, the financial
   Budget for such fiscal year, accompanied by a certificate executed by a
   Responsible Officer, certifying that such Budget was prepared by Borrower
   based on assumptions which, in light of the historical performance of the
   Companies and their prospects for the future, are reasonable.

      (d) Promptly upon receipt thereof, copies of all auditor's annual
   management letters delivered to Borrower.

      (e) Notice, promptly after Borrower or any other company knows or has
   reason to know of (i) the existence and status of any Litigation which could
   be a Material Adverse Event, or of any order or judgment for the payment of
   money which (individually or collectively) is in excess of $1,000,000, or any
   warrant of attachment, sequestration, or similar proceeding against the
   assets of any Company or Guarantor having a value (individually or
   collectively) of $1,000,000, (ii) any material change in any material fact or
   circumstance represented or

                                       61
<PAGE>
 
 warranted in any Loan Paper, (iii) a Default or Potential Default specifying
 the nature thereof and what action Borrower or any other Company or Guarantor
 has taken, is taking, or proposes to take with respect thereto, (iv) the
 receipt by any Company or Guarantor of any notice from any Governmental
 Authority of the expiration without renewal, termination, material modification
 or suspension of, or institution of any proceedings to terminate, materially
 modify, or suspend, any Authorization granted by such Governmental Authority,
 or any other Authorization which any Company or Guarantor is required to hold
 in order to operate its business in compliance with all applicable Laws, other
 than such expirations, terminations, suspensions, or modifications which
 individually or in the aggregate, would not constitute a Material Adverse
 Event, (v) any federal, state, or local statute, regulation, or ordinance or
 judicial or administrative order limiting or controlling the operations of any
 Company or any Guarantor which has been issued or adopted hereafter and which
 is of material adverse importance or effect in relation to the operation of any
 Company or Guarantor, (vi) the receipt by any Company or any Guarantor of
 notice of any violation or alleged violation of any Environmental Law, which
 violation or alleged violation could individually or collectively with other
 such violations or allegations, constitute a Material Adverse Event, or (vii)
 (A) the occurrence of a Reportable Event that, alone or TOGETHER WITH any other
 Reportable Event, could reasonably be expected to result in liability of
 Borrower or any Company or Guarantor to the PBGC in an aggregate amount
 exceeding $1,000,000; (B) any expressed statement in writing on the part of the
 PBGC of its intention to terminate any Employee Plan or Plans; (C) Borrower's
 or an ERISA Affiliate's becoming obligated to file with the PBGC a notice of
 failure to make a required installment or other payment with respect to an
 Employee Plan; or (D) the receipt by Borrower or an ERISA Affiliate from the
 sponsor of a Multiemployer Plan of either a notice concerning the imposition of
 withdrawal liability in an aggregate amount exceeding $1,000,000 or of the
 impending termination or reorganization of such Multiemployer Plan.

      (f) Promptly after any of the information or disclosures provided on any
 of the Schedules delivered pursuant to this Agreement or any Annexes to any of
 the Collateral Documents becomes outdated or incorrect in any material respect,
 such revised or updated Schedule(s) or Annexes as may be necessary or
 appropriate to update or correct such information or disclosures; PROVIDED
 THAT, no deletions may be made to any Annexes describing Collateral in any of
 the Collateral Documents unless approved by Required Lenders.

      (g) Promptly after preparation, true, correct, and complete copies of all
 material reports or filings filed by or on behalf of any Company with any
 Governmental Authority (including the FCC and the Securities and Exchange
 Commission).

        (h) Promptly after the filing thereof, a true, correct, and complete
 copy of each FORM 10-K, FORM 10-Q, and FORM 8-K filed by or on behalf of
 Borrower or any Company or any Guarantor with the Securities and Exchange
 Commission.

                                       62
<PAGE>
 
       (i) Promptly upon request therefor by Administrative Agent or Lenders,
 such information (not otherwise required to be furnished under the Loan Papers)
 respecting the business affairs, assets, and liabilities of the Companies or
 the Guarantors, and such opinions, certifications, and documents, in addition
 to those mentioned in this Agreement, as reasonably requested.

 9.4 INSPECTIONS. Upon reasonable notice, and prior to the occurrence and
continuation of any Potential Default or Default, not more than once each fiscal
quarter prior to the occurrence and continuation of any Potential Default or
Default, and following the occurrence and continuation of any Potential Default
or Default, as often as determined by Administrative Agent or any Lender, the
Companies and the Guarantors shall allow Administrative Agent or any Lender (or
their respective Representatives) to inspect any of their properties, to review
reports, files, and other records and to make and take away copies thereof, to
conduct tests or investigations, and to discuss any of their affairs,
conditions, and finances with other creditors, directors, officers, employees,
other representatives, and independent accountants of the Companies or
Guarantors, from time to time, during reasonable business hours.

 9.5 TAXES. Each Company and each Guarantor (a) shall promptly pay when due
any and all Taxes OTHER THAN Taxes the applicability, amount, or validity of
which is being contested in good faith by lawful proceedings diligently
conducted, and against which reserve or other provision has been made, and in
respect of which levy and execution of any lien securing same have been and
continue to be stayed, (b) shall not, directly or indirectly, use any portion of
the proceeds of any Borrowing to pay the wages of employees unless a timely
payment to or deposit with the appropriate Governmental Authorities of all
amounts of Tax required to be deducted and withheld with respect to such wages
is also made, and (c) shall promptly notify Lenders if the Internal Revenue
Service or any other taxing authority commences or notifies any Company or any
Guarantor of its intention to commence an audit or investigation with respect to
any taxes of any kind due or alleged to be due from any Company or any
Guarantor.

 9.6 PAYMENT OF OBLIGATIONS. Borrower shall pay the Obligation in
accordance with the terms and provisions of the Loan Papers. Each Company and
each Guarantor (a) shall promptly pay (or renew and extend) all of its material
obligations and Debt as the same become due (unless such obligations and Debt
(other than the obligation) are being contested in good faith by appropriate
proceedings), and (b) shall not make any voluntary prepayment of principal of,
or interest on, any other Debt (other than the obligation), which is subordinate
to the Obligation. Borrower shall not make any payment on any Subordinated Debt
when it violates the subordination provisions thereof.

 9.7 MAINTENANCE OF EXISTENCE, ASSETS, AND BUSINESS. Except as otherwise
permitted by SECTION 9.26, each Company and each Guarantor shall at all times:
(a) maintain its existence and good standing in the jurisdiction of its
organization and its authority to transact business in all other jurisdictions
where the failure to so maintain its authority to transact business could be a
Material Adverse Event; (b) maintain all licenses, permits, and franchises
necessary for its business where the failure to so maintain could be a Material
Adverse Event; (c) keep all of its assets (including, without limitation,
computer software) which are useful in and necessary to its

                                       63
<PAGE>
 
business in good working order and condition (ordinary wear and tear excepted)
and make all necessary repairs thereto and replacements thereof; and (d) do all
things necessary to obtain, renew, extend, and continue in effect all
Authorizations issued by any Governmental Authority which may at any time and
from time to time be necessary for the Companies and Guarantors to operate their
businesses in compliance with applicable Law, where the failure to so renew,
extend, or continue in effect could be a Material Adverse Event.

      9.8 INSURANCE. The Companies and Guarantors shall, at their sole cost and
expense, keep and maintain the Collateral owned by such Company or Guarantor
insured for its actual cash value against loss or damage by fire, theft,
explosion, flood, and all other hazards and risks ordinarily insured against by
other owners or users of such properties in similar businesses of comparable
size and notify Administrative Agent promptly of any occurrence causing a
material loss or decline in value of the Collateral and the estimated (or
actual, if available) amount of such loss or decline. All policies of insurance
on the Collateral shall be in a form, with such deductibles, and with insurers
recognized as adequate by prudent business Persons in the same businesses as the
Companies or Guarantors and reasonably acceptable to Administrative Agent, and
all such policies shall be in such amount as may be reasonably satisfactory to
Administrative Agent. On the Closing Date and thereafter as each policy is
renewed and extended, the Companies and Guarantors shall deliver to
Administrative Agent a certificate of insurance for each policy of insurance and
evidence of payment of all premiums therefor. Such policies of insurance and the
certificates evidencing the same shall contain an endorsement, in form and
substance acceptable to Administrative Agent, showing loss payable to
Administrative Agent for the benefit of Lenders. Such endorsement, or an
independent instrument furnished to Administrative Agent, shall provide that the
insurance companies will give Administrative Agent at least thirty (30) days
prior written notice before any such policy or policies of insurance shall be
altered or canceled and that no act or default of any Company, any Guarantor, or
any other Person shall affect the Right of Administrative Agent to recover under
such policy or policies of insurance in case of loss or damage. Upon the payment
by the insurer of the proceeds of any such policy of insurance and if no Default
has occurred and is continuing, the Company or Guarantor so insured may retain
such insurance if such proceeds are used to repair or replace the property the
damage or destruction of which gave rise to the payment of such insurance
proceeds; PROVIDED, HOWEVER, that any insurance proceeds not used for repair or
replacement in accordance herewith, UNLESS paid as reimbursement of expenses
incurred and business losses suffered in connection with the loss or damage to
the Collateral, shall be paid to or retained by Administrative Agent for
application as a mandatory prepayment on the Obligation.

      9.9 PRESERVATION AND PROTECTION OF RIGHTS. Each Company and each Guarantor
shall perform such acts and duly authorize, execute, acknowledge, deliver, file,
and record any additional agreements, documents, instruments, and certificates
as Administrative Agent or Required Lenders may reasonably deem necessary or
appropriate in order to preserve and protect the Rights of Administrative Agent
and Lenders under any Loan Paper.

     9.10 EMPLOYEE BENEFIT PLANS. Borrower shall not, directly or indirectly,
engage in any "PROHIBITED TRANSACTION" (as defined in SECTION 406 of ERISA or
SECTION 4975 of the Code), and the Companies, the Guarantors, and

                                       64
<PAGE>
 
their respective ERISA Affiliates shall not, directly or indirectly, (a) incur
any "ACCUMULATED FUNDING DEFICIENCY" as such term is defined in SECTION 302 of
ERISA with respect to any Employee Plan, (b) permit any Employee Plan to be
subject to involuntary termination proceedings pursuant to TITLE IV of ERISA, or
(c) fully or partially withdraw from any Multiemployer Plan, if such prohibited
transaction, accumulated funding deficiency, termination proceeding, or
withdrawal would result in liability on the part of any Company or any Guarantor
(individually or collectively) in excess of $1,000,000.

      9.11 ENVIRONMENTAL LAWS. Each Company and each Guarantor shall (a) conduct
its business so as to materially comply with all applicable Environmental Laws
and shall promptly take action to remedy any non-compliance with any
Environmental Law unless a failure to comply or remedy, whether individually or
in the aggregate would not be a Material Adverse Event, (b) promptly investigate
and remediate any known Release or threatened Release of any Hazardous Substance
on any property owned by any Company or any GUARANTOR OR AT ANY FACILITY
OPERATED by any Company or any Guarantor to the extent required by Environmental
Laws, unless a failure to investigate or remediate would not be a Material
Adverse Event.

      9.12 ACCREDITATION AND LICENSING. Borrower and each of its Subsidiaries
shall keep itself fully licensed with all licenses required to operate such
Person's business under applicable law, except to the extent that the loss or
relinquishment of such qualification would not result in a Material Adverse
Event. Borrower will promptly furnish or cause to be furnished to Administrative
Agent copies of all reports and correspondence it or any Subsidiary sends or
receives relating to any loss or revocation (or threatened loss or revocation)
of any qualification described in this SECTION 9.12.

      9.13 DEBT AND GUARANTIES.

       (a) No Company or Guarantor shall, directly or indirectly, create, incur,
  or suffer to exist any direct, indirect, fixed, or contingent liability for
  any Debt, OTHER THAN:

           (i) The Obligation;

           (ii) Debt incurred by Borrower under any Financial Hedge;

           (iii) Debt between Companies;

           (iv) Existing Debt described on SCHEDULE 9.13 attached hereto;

           (v) Purchase Money Debt, and Debt of any Acquisition Target assumed
       by any Company in connection with any Permitted Acquisitions in the
       aggregate outstanding principal amount of not more than $1,500,000 from
       the date hereof through December 31, 1998, and $3,500,000 thereafter;

           (vi) Debt arising under Capital Leases; and

           (vii) Subordinated Debt of the Borrower to the seller of an
       Acquisition Target incurred in connection with a Permitted

                                       65
<PAGE>
 
       Acquisition.

       (b) No Company or Guarantor shall guarantee or assume or agree to become
 liable in any way, either directly or indirectly, for any Debt or liability of
 others, except (i) endorsements of checks or drafts in the ordinary course of
 business, (ii) the obligations of the Companies and Guarantors under the
 Guaranty, and as permitted by SECTIONS 9.13(A), 9.21 and 9.25, including with
 respect to Debt or liabilities of another Company.

      9.14 LIENS. No Company or Guarantor will, directly or indirectly, (a)
enter into or permit to exist any arrangement or agreement which directly or
indirectly prohibits any Company or Guarantor from creating or incurring any
Lien on any of its assets, other than the Loan Papers, or (b) create, incur, or
suffer or permit to be created or incurred or to exist any Lien upon any of its
assets, other than pursuant to the Loan Papers, EXCEPT:

       (i) Pledges or deposits made to secure payment of worker's compensation,
 or to participate in any fund in connection with worker's compensation,
 unemployment insurance, pensions, or other social security programs;

       (ii) Good-faith pledges or deposits made to secure performance of bids,
 tenders, insurance or other contracts (OTHER THAN for the repayment of borrowed
 money), or leases, or to secure statutory obligations, surety or appeal bonds,
 or indemnity, performance, or other similar bonds as all such Liens arise in
 the ordinary course of business of the Companies and Guarantors;

       (iii) Encumbrances consisting of zoning restrictions, easements, or other
 restrictions on the use of real property, none of which impair in any material
 respect the use of such property by the Person in question in the operation of
 its business, and none of which is violated by existing or proposed structures
 or land use;

       (iv) Liens of landlords or of mortgagees of landlords, arising by
 operation of law or pursuant to a lease, on fixtures and movable property
 located on premises leased in the ordinary course of business, which liens
 shall secure only amounts due and payable under the applicable lease;

        (v) The following, SO LONG AS the validity or amount thereof is being
 contested in good faith and by appropriate and lawful proceedings diligently
 conducted, reserve or other appropriate provisions (if any) required by GAAP
 shall have been made, levy and execution thereon have been stayed and continue
 to be stayed, and they do not in the aggregate materially detract from the
 value of the property of the Person in question, or materially impair the use
 thereof in the operation of its business: (i) claims and Liens for Taxes (other
 than Liens relating to Environmental Laws or ERISA); (ii) claims and Liens
 upon, and defects of title to, real or personal property, including any
 attachment of personal or real property or other legal process prior to
 adjudication of a dispute of the merits; and (iii) claims and Liens of
 mechanics, materialmen, warehousemen, carriers, landlords, or other like Liens;

                                       66
<PAGE>
 
      (vi) The Lien of mortgages, Capital Leases, Liens securing Purchase Money
 Debt, conditional sale contracts, security interests or arrangements for the
 retention of title on property acquired by a Company after the date hereof,
 useful and intended to be used in carrying on the business of such Company,
 PROVIDED THAT:

           (1) the Lien shall not extend to any property owned by any Company as
      of the date hereof or not acquired pursuant to such Capital Lease or with
      such Purchase Money Debt;

           (2) at the time the Debt is issued or incurred, the aggregate amount
      of the Debt secured by the Lien on such property shall not exceed the
      lesser of the purchase price or the fair market value of the property as
      determined in good faith by the Board of Directors of the Company; and

            (3) the Debt secured by such Liens shall be issued or incurred
       within the limitations of SECTION 9.13(A)(VI);

      (vii) Liens securing the $800,000 Promissory Note dated January 22, 1993
 made by IOI Management Services of Houston, Inc., payable to Borrower, as
 amended, and as collaterally assigned to Administrative Agent; and

      (viii) Contracts existing on the Closing Date which contain provisions
 restricting or prohibiting the granting of a Lien in such contracts, and
 contracts entered into by any Company after the Closing Date, which, after
 reasonable best efforts by the Company to delete any provisions restricting or
 prohibiting the creation of a Lien on such contract, contains such provisions.

      9.15 TRANSACTIONS WITH AFFILIATES. No Company or Guarantor shall enter
into any material transaction with any of its Affiliates (excluding transactions
among or between Companies), OTHER THAN transactions in the ordinary course of
business and upon fair and reasonable terms not materially less favorable than
such Company or Guarantor could obtain or could become entitled to in an arm's-
length transaction with a Person that was not its Affiliate.

      9.16 COMPLIANCE WITH LAWS AND DOCUMENTS. No Company or Guarantor shall
violate the provisions of any Laws applicable to it, including, without
limitation, all rules and regulations promulgated by any Governmental Authority,
or any material written or oral agreement, contract, commitment, or
understanding to which it is a party, if such violation alone, or when
aggregated with all other such violations, could be a Material Adverse Event; no
Company or Guarantor shall violate the provisions of its charter, bylaws, or
partnership agreement, or modify, repeal, replace, or amend any provision of its
charter, bylaws, or partnership agreement, if such action could adversely affect
the Rights of Lenders.

      9.17 PERMITTED ACQUISITIONS, SUBSIDIARY GUARANTIES, AND COLLATERAL
DOCUMENTS. In connection with each Permitted Acquisition, Borrower shall
deliver, or cause to be delivered to, Administrative Agent each of the items
described on SCHEDULE 7.2, on or before the date specified on such Schedule for

                                       67
<PAGE>
 
each such item. Borrower shall cause each Subsidiary that becomes a Subsidiary
of any Company after the Closing Date (whether as a result of acquisition,
merger, creation, or otherwise), (a) to execute a Guaranty on the date such
entity becomes a Subsidiary of a Company and promptly deliver (but in no event
later than 10 days following consummation of such creation, acquisition, or
merger) such Guaranty to Administrative Agent and (b) to execute and deliver to
Administrative Agent all required Collateral Documents creating Liens in favor
of Administrative Agent on all the assets of such Subsidiary, to the extent set
forth in SECTION 6.5.

      9.18 ASSIGNMENT. No Company or Guarantor shall assign or transfer any of
its rights, duties, or obligations under any of the Loan Papers.

      9.19 FISCAL YEAR AND ACCOUNTING METHODS. No Company or Guarantor will
change its Fiscal Year for book accounting purposes or its method of accounting,
OTHER THAN (a) immaterial changes in methods or as required by GAAP, or (b) in
connection with a Permitted Acquisition, such changes to the newly-acquired
entity so as to conform its fiscal year and its method of accounting to those of
the Companies.

      9.20 GOVERNMENT REGULATIONS. No Company or Guarantor will conduct its
business in such a way that it will become subject to regulation under the
INVESTMENT COMPANY ACT OF 1940, as amended, the PUBLIC UTILITY HOLDING COMPANY
ACT OF 1935, as amended, or any other Law (other than Regulations G, T, U, and X
of the Board of Governors of the Federal Reserve System) which regulates the
incurrence of Debt.

      9.21 LOANS, ADVANCES, AND INVESTMENTS. No Company or Guarantor shall make
any loan, advance, extension of credit, or capital contribution to, make any
investment in, or purchase or commit to purchase any stock or other securities
or evidences of Debt of, or interests in, any other Person, OTHER THAN (a)
readily marketable, direct, full faith and credit obligations of the United
States of America, or obligations guaranteed by the full faith and credit of the
United States of America, maturing within not more than one year from the date
of acquisition; (b) short term certificates of deposit and time deposits, which
mature within one year from the date of issuance and which are fully insured by
the Federal Deposit Insurance Corporation; (c) commercial paper maturing in 365
days or less from the date of issuance and rated either "P-1" by Moody's
Investors Service, Inc. ("MOODY'S"), or "A-l" by Standard and Poor's Rating
Group (a division of McGraw-Hill, Inc., "S&P"); (d) debt instruments of a
domestic issuer which mature in one year or less and which are rated "A" or
better by Moody's or S&P on the date of acquisition of such investment; (e)
demand deposit accounts which are maintained in the ordinary course of business;
(f) loans, advances, extensions of credit, capital contributions, and other
investments between Companies; (g) Permitted Acquisitions; (h) trade accounts
receivable which are for goods furnished or services rendered in the ordinary
course of business and are payable in accordance with customary trade terms; (i)
purchase of accounts receivable by any Company from any Managed Practice so long
as such Company has properly filed a financing statement in the appropriate
offices, describing the accounts receivable, naming the Managed Practice as
debtor, the Company, as secured party, and Administrative Agent, as assignee to
protect the parties' interests; and (j) Managed Practice Loans not exceeding
$2,000,000.00 in aggregate outstanding principal amount at any time and loans to
officers and employees of

                                       68
<PAGE>
 
the Companies, not exceeding $500,000.00 in  aggregate  outstanding   principal
amount at any time.

      9.22 DISTRIBUTIONS AND RESTRICTED PAYMENTS. No Company or Guarantor may
directly or indirectly declare, make, or pay any Restricted Payment, other than:

       (a) Distributions declared, made, or paid by Borrower wholly in the form
  of its capital stock;

       (b) Distributions by any Company or Guarantor to Borrower or any other
  Company;

       (c) So long as no Default or Potential Default exists, regularly
  scheduled payments (but not prepayments) of principal and interest on
  Subordinated Debt at the contract rate; and

       (d) The repurchase of up to 47,081 shares of the common capital stock of
  Borrower currently held by Merritt Orthopaedics, Inc. for an aggregate
  consideration not to exceed $250,000.00.

Notwithstanding the foregoing, Restricted Payments and Distributions are
permitted hereunder only to the extent such Restricted Payment or Distribution
is made in accordance with applicable Law.

      9.23 RESTRICTIONS ON SUBSIDIARIES. No Subsidiary of Borrower nor any
Guarantor shall enter into or permit to exist any material arrangement or
agreement (other than the Loan Papers) which directly or indirectly prohibits
any such Subsidiary from (a) declaring, making, or paying, directly or
indirectly, any Distribution to Borrower or any other Company, (b) paying any
Debt owed to Borrower or any other Company, (c) making loans, advances, or
investments to Borrower or any other Company, or (d) transferring any of its
property or assets to Borrower or any other Company.

      9.24 SALE OF ASSETS. No Company or Guarantor shall sell, assign, transfer,
or otherwise dispose of any of its assets, OTHER THAN (a) sales of inventory in
the ordinary course of business, (b) the sale, discount, or transfer of
delinquent accounts receivable in the ordinary course of business for purposes
of collection, (c) occasional sales of immaterial assets for consideration not
less than the fair market value thereof, (d) dispositions of obsolete assets,
(e) sale, leases, or other disposition among Companies or from a Guarantor to a
Company; (f) sales, leases, or other dispositions of equipment outside the
ordinary course of business PROVIDED, however, that Borrower shall make a
mandatory prepayment of the Revolver Principal Debt in accordance with the
provisions of SECTION 3.2 in an amount equal to, and contemporaneously with the
receipt of the gross proceeds of any such sale (LESS any reasonable selling
expenses related thereto), (g) sales of assets outside the ordinary course of
business (i) other than the sale of all or substantially all of the assets
related to a Managed Practice, having an aggregate fair market value not
exceeding $1,500,000, during the fiscal year ending December 31, 1998, and (ii)
including the sale of all or substantially all of the assets related to any
Managed Practice, during any fiscal year thereafter having a value (determined
as the greater of fair market value or book value) which when added to the value
(determined as the greater of fair market value or book value) of all

                                       69
<PAGE>
 
such other assets sold during such year, does not exceed 5% of the Borrower's
total assets as reflected on the most recent balance sheet furnished to
Administrative Agent pursuant to SECTION 9.3 at the time of any such sale,
PROVIDED, however, that Borrower shall make a mandatory prepayment of the
Revolver Principal Debt in accordance with the provisions of SECTION 3.2 in an
amount equal to, and contemporaneously with the receipt of, the gross proceeds
of any such sale (less any reasonable selling expenses related thereto); and (h)
if no Default or Potential Default then exists or arises as a result thereof,
sales of other assets, including equipment, in the ordinary course of business.

      9.25 SALE-LEASEBACK FINANCINGS. No Company or Guarantor will enter into
any sale-leaseback arrangement with any Person pursuant to which such Company or
Guarantor shall lease any asset (whether now owned or hereafter acquired) if
such asset has been or is to be sold or transferred by any Company to any other
Person, other than aggregate sale-leasebacks of assets having a fair market
value of not more than $500,000 in the aggregate.

      9.26 MERGERS AND DISSOLUTIONS; SALE OF CAPITAL STOCK. No Company or
Guarantor will, directly or indirectly, merge or consolidate with any other
Person, other than (a) the dissolution of Rehabilitation Corporation of America,
(b) as a result of a Permitted Acquisition, (c) mergers or consolidations
involving Borrower if Borrower is the surviving entity, (d) mergers among
Wholly-owned Companies; PROVIDED THAT, in any merger involving Borrower
(including a Permitted Acquisition effected as a merger), Borrower must be the
surviving entity, and, in any merger involving any other Company (including a
Permitted Acquisition effected as a merger), a Company must be the surviving
entity. No Company or Guarantor shall liquidate, wind up, or dissolve (or suffer
any liquidation or dissolution), other than liquidations, wind ups, or
dissolutions incident to mergers permitted under this SECTION 9.26. No Company
or Guarantor may sell, assign, lease, transfer, or otherwise dispose of the
capital stock (or other ownership interests) of any other Company, EXCEPT for
sales, leases, transfers, or other such distributions to another Company.

      9.27 NEW BUSINESS. No Company or Guarantor will alter the character of its
business from that conducted as of the Closing Date or engage in any business
other than the business conducted as of the Closing Date and activities which
are substantially similar or related thereto.

      9.28 [LEFT INTENTIONALLY BLANK.]

      9.29 AMENDMENTS TO DOCUMENTS. No Company or Guarantor shall (a) amend or
permit any amendments to any Company's Articles of Incorporation or Bylaws as in
effect on the date of this Agreement, if such action could adversely affect the
Rights of Lenders; (b) amend any existing credit arrangement or enter into any
new credit arrangement (to the extent permitted by the Loan Papers), if such
amended or new credit arrangements contain any provisions which are materially
more restrictive (as reasonably determined by Administrative Agent) than the
provisions of the Loan Papers; or (c) amend any subordination provision of any
now existing or hereafter arising Subordinated Debt or modify or amend in any
material respect, or waive compliance with the terms of, any Service Agreement
Basic Provision in any Service Agreement.

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<PAGE>
 
      9.30  FINANCIAL COVENANTS. As calculated on a consolidated basis for the
Companies:

      (a) TOTAL FUNDED DEBT TO PRO FORMA EBITDA RATIO. Borrower shall not permit
 the ratio of: (i) Total Funded Debt to (ii) Pro Forma EBITDA of the Companies
 calculated on a consolidated basis, determined at the end of each fiscal
 quarter of the Companies set forth below, to be less than zero or greater than
 the ratio shown in the table below:
<TABLE> 
<CAPTION> 
 
 APPLICABLE PERIOD                      MAXIMUM TOTAL FUNDED
                                       DEBT TO PRO FORMA EBITDA
                                                RATIO
<S>                                    <C>  
Date of Initial Borrowing to and
 including December 30, 1999                      4.25
December 31, 1999 to and including               
 June 29, 2000                                    3.75
June 30, 2000 and thereafter                      3.25
</TABLE> 

      (b) CONSOLIDATED NET WORTH. Borrower shall not permit, as of the last day
 of each fiscal quarter of Borrower, its Consolidated Net Worth to be LESS than
 95% of Borrower's Consolidated Net Worth as of the fiscal quarter ended June
 30, 1998, but in no event less than $30,469,000, such amount to be (a)
 increased on the last day of each successive fiscal quarter of Borrower by an
 amount equal to seventy-five percent (75%) of the increase in net worth arising
 from any Equity Issuance during such fiscal quarter, and (b) increased on the
 last day of each fiscal quarter of Borrower by an amount equal to seventy-five
 percent (75%) of positive consolidated net income for such fiscal quarter.

      (c) MAXIMUM TOTAL FUNDED DEBT TO CAPITALIZATION. Borrower shall not permit
 the ratio of Total Funded Debt to Capitalization determined on the Closing Date
 and at the end of each fiscal quarter of the Companies thereafter to be greater
 than the ratio shown in the table below:

<TABLE>
<CAPTION>
         APPLICABLE PERIOD               MAXIMUM TOTAL FUNDED
                                         DEBT TO CAPITALIZATION
                                                  RATIO
<S>                                      <C>

Closing Date to and including September
30, 1998                                           50%

October 1, 1998 and thereafter                     60%
</TABLE>

        (d) INTEREST COVERAGE. Borrower shall not permit the ratio of (i) actual
 EBITDA of the Companies for any twelve month period prior to the date of
 calculation (or if less, from the date of the Initial

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<PAGE>
 
 Borrowing hereunder) to (ii) the cash Interest Expense of the Companies for the
 same period determined on a quarterly basis at the end of each fiscal quarter
 of the Companies for the twelve month (or lesser period, as applicable) period
 then-ended, to be less than or equal to 1.5 to 1.0, from the date of the
 Initial Borrowing through December 31, 1998. For purposes of calculating actual
 EBITDA for the fiscal quarter in which the Initial Borrowing occurs hereunder,
 Borrower may prorate the actual EBITDA of the Companies for such fiscal quarter
 from the date of the Initial Borrowing until the end of such fiscal quarter.

      (e) FIXED CHARGE COVERAGE RATIO. As of the last day of each fiscal
 quarter, commencing March 31, 1999, with respect to the most recently ended
 twelve month period prior to the date of calculation (or if less, from the date
 of the Initial Borrowing hereunder), the ratio of: (a) the Companies' actual
 EBITDAR for such period, less (i) cash Taxes of the Companies for such period,
 and (ii) Capital Expenditures made by the Companies during such period to (b)
 the SUM of (i) all mandatory prepayments and regularly-scheduled principal
 payments with respect to Total Funded Debt of the Companies required to be paid
 during such period, (ii) cash Interest Expense of the Companies during such
 period, and (iii) Rental Expense of the Companies during such period shall not
 be less than 1.25 to 1.00. For purposes of calculating actual EBITDAR for the
 fiscal quarter in which the Initial Borrowing occurs hereunder, Borrower may
 prorate the actual EBITDAR of the Companies for such fiscal quarter from the
 date of the Initial Borrowing until the end of such fiscal quarter.

 9.31 YEAR 2000. All of the material computer software, computer firmware,
computer hardware (whether general or special purpose), and other similar or
related items of automated, computerized, and/or software systems that are used
or relied on by the Companies in the conduct of their respective businesses will
not malfunction, will not cease to function, will not generate incorrect data,
and will not produce incorrect results when processing, providing, and/or
receiving (a) date-related data into and between the twentieth and twenty-first
centuries and (b) date-related data in connection with any valid date in the
twentieth and twenty-first centuries.

 9.32 REHABILITATION CORPORATION OF AMERICA. Borrower agrees to cause
Rehabilitation Corporation of America to be dissolved as soon as possible.
Borrower shall not and shall not permit any Company to transfer any assets to,
make any loan to, or investment in, Rehabilitation Corporation of America other
than a contribution not to exceed $10,000 to pay franchise taxes necessary for
dissolution. Borrower shall not permit Rehabilitation Corporation of America to
engage in any business of any nature whatsoever, other than causing it to be
dissolved.

SECTION 10  DEFAULT. The term "DEFAULT" means the occurrence of any  one  or
more of the following events:

      10.1  PAYMENT OF OBLIGATION.  The failure or refusal of any Company or
Guarantor to pay (a) the principal portion of  the obligation when the same
becomes  due; (b) any other portion of the obligation (other than as described
in SECTION 10.1(A) and (C)) within three Business Days  of becoming due (whether

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<PAGE>
 
by its terms, by acceleration, or as otherwise provided in the Loan  Papers);
and (c) the  indemnifications and reimbursement obligations provided for in the
Loan Papers after demand therefor.

 10.2 COVENANTS. The failure or refusal of Borrower (and, if applicable, any
other Company or Guarantor) to punctually and properly perform, observe, and 
comply with:

      (a) Any covenant, agreement, or condition contained in SECTIONS 9.1, 9.3,
 9.6(B), 9.13, 9.14, 9.17, 9.20 through 9.26, 9.29, 9.30, AND 9.31; and

      (b) Any other covenant, agreement, or condition contained in any Loan
 Paper (OTHER THAN the covenants to pay the Obligation set forth in SECTION 10.1
 and the covenants in SECTION 10.2(A)), and such failure or refusal continues
 for 10 days after Administrative Agent gives written notice to Borrower of the
 existence of such failure or refusal.

 10.3 DEBTOR RELIEF. Borrower, any other Company, or Guarantor (a) fails to pay
its Debts generally as they become due, (b) voluntarily seeks, consents to, or
acquiesces in the benefit of any Debtor Relief Law, OTHER THAN as a creditor or
claimant, or (c) becomes a party to or is made the subject of any proceeding
provided for by any Debtor Relief Law, OTHER THAN as a creditor or claimant,
that could suspend or otherwise adversely affect the Rights of Administrative
Agent or any Lender granted in the Loan Papers (UNLESS, in the event such
proceeding is involuntary, the petition instituting same is dismissed within 60
days after its filing).
 
 10.4 JUDGMENTS AND ATTACHMENTS. Any Company or Guarantor fails, within 60
days after entry, to pay, bond, or otherwise discharge any judgment or order for
the payment of money in excess of $1,000,000 (individually or collectively) or
any warrant of attachment, sequestration, or similar proceeding against any
Company's assets having a value (individually or collectively) of $1,000,000
which is not stayed on appeal.

 10.5  GOVERNMENT ACTION. (a) A final non-appealable order is issued by any
Governmental Authority, seeking to cause any Company or Guarantor to divest a
significant portion of its assets pursuant to any antitrust, restraint of trade,
unfair competition, industry regulation, or similar Laws, or (b) any
Governmental Authority shall condemn, seize, or otherwise appropriate, or take
custody or control of all or any substantial portion of the assets of any
Company or Guarantor.

 10.6 MISREPRESENTATION. Any representation or warranty made by any Company or
Guarantor contained in any Loan Paper shall at any time prove to have been
incorrect in any material respect when made.

 10.7 CHANGE OF CONTROL. Any Change of Control shall occur.

 10.8 DEFAULT UNDER OTHER DEBT AND AGREEMENTS. Any default exists under any 
material written or oral agreement, indebtedness or contract to which a Company
or Guarantor is a party (including, without limitation, under any Service
Agreement, Seller Note or Acquisition Agreement) which default, individually or
in the aggregate with all other such defaults, would be a

                                       73
<PAGE>
 
Material Adverse Event.

      10.9  EMPLOYEE BENEFIT PLANS. (a) A "REPORTABLE EVENT" or "REPORTABLE
EVENTS," or a failure to make a required installment or other payment (within
the meaning of SECTION 412(N)(1) of the Code), shall have occurred with respect
to any Employee Plan or Plans that is expected to result in liability of
Borrower to the PBGC or to a Plan in an aggregate amount exceeding $1,000,000
and, within 30 days after the reporting of any such Reportable Event to
Administrative Agent or after the receipt by Administrative Agent of a statement
required pursuant to SECTION 8.3(D) hereof, Administrative Agent shall have
notified Borrower in writing that (i) Required Lenders have made a reasonable
determination that, on the basis of such Reportable Event or Reportable Events
or the failure to make a required payment, there are grounds under TITLE IV of
ERISA for the termination of such Employee Plan or Plans by the PBGC, or the
appointment by the appropriate United States district court of a trustee to
administer such Employee Plan or Plans or the imposition of a lien pursuant to
SECTION 412(N) of the Code in favor of an Employee Plan and (ii) as a result
thereof a Default exists hereunder; or (b) Borrower or any ERISA Affiliate has
provided to any affected party a 60-day notice of intent to terminate an
Employee Plan pursuant to a distress termination in accordance with SECTION
4041(C) of ERISA if the liability expected to be incurred as a result of such
termination will exceed $1,000,000; or (c) a trustee shall be appointed by a
United States district court to administer any such Employee Plan; or (d) the
PBGC shall institute proceedings (including giving notice of intent thereof) to
terminate any such Employee Plan; or (e)(i) Borrower or any ERISA Affiliate
shall have been notified by the sponsor of a Multiemployer Plan that it has
incurred withdrawal liability (within the meaning of SECTION 4201 of ERISA) to
such Multiemployer Plan, (ii) Borrower or such ERISA Affiliate does not have
reasonable grounds for contesting such withdrawal liability or is not contesting
such withdrawal liability in a timely and appropriate manner and (iii) the
amount of such withdrawal liability specified in such notice, when aggregated
with all other amounts required to be paid to Multiemployer Plans in connection
with withdrawal liabilities (determined as of the date or dates of such
notification), exceeds $1,000,000; or (f) Borrower or any ERISA Affiliate shall
have been notified by the sponsor of a Multiemployer Plan that such
Multiemployer Plan is in reorganization or is being terminated, within the
meaning of TITLE IV of ERISA, if solely as a result of such reorganization or
termination the aggregate annual contributions of Borrower and its ERISA
Affiliates to all Multiemployer Plans that are then in reorganization or have
been or are being terminated have been or will be increased over the amounts
required to be contributed to such Multiemployer Plans for their most recently
completed plan years by an amount exceeding $1,000,000.

      10.10 VALIDITY AND ENFORCEABILITY OF LOAN PAPERS. Any Loan Paper shall, at
any time after its execution and delivery and for any reason, cease to be in
full force and effect in any material respect or be declared to be null and void
(other than in accordance with the terms hereof or thereof) or the validity or
enforceability thereof be contested by any Company or Guarantor party thereto or
any Company or Guarantor shall deny in writing that it has any or any further
liability or obligations under any Loan Paper to which it is a party.

     10.11  CHANGE IN LAWS. The enactment of or any change in any law or
regulation governing or affecting a physician practice management company or

                                       74
<PAGE>
 
any practice or practice group managed thereby, including without limitation any
Healthcare Laws, which would be a Material Adverse Event and which has not
ceased to be a Material Adverse Event by the ninetieth day after the
effectiveness thereof.

SECTION 11  RIGHTS AND REMEDIES.

 11.1  REMEDIES UPON DEFAULT.

      (a) If a Default exists under SECTION 10.3(B) or 10.3(C), the commitment
 to extend credit hereunder shall automatically terminate and the entire unpaid
 balance of the obligation shall automatically become due and payable without
 any action or notice of any kind whatsoever and Borrower shall be required to
 provide cash collateral in an amount equal to 105% of the LC Exposure then
 existing or a Collateral Letter of Credit in accordance with SECTION 2.2(H).

      (b) If any Default exists, Administrative Agent may (and, subject to the
 terms of SECTION 12, shall upon the request of Required Lenders) or Required
 Lenders may, do any one or more of the following: (i) if the maturity of the
 obligation has not already been accelerated under SECTION 11.1(A), declare the
 entire unpaid balance of the obligation, or any part thereof, immediately due
 and payable, whereupon it shall be due and payable; (ii) terminate the
 commitments of Lenders to extend credit hereunder; (iii) reduce any claim to
 judgment; (iv) to the extent permitted by Law, exercise (or request each Lender
 to, and each Lender shall be entitled to, exercise) the Rights of offset or
 banker's Lien against the interest of Borrower in and to every account and
 other property of Borrower which are in the possession of Administrative Agent
 or any Lender to the extent of the full amount of the Obligation (to the extent
 permitted by Law, Borrower being deemed directly obligated to each Lender in
 the full amount of the Obligation for such purposes); (v) if the maturity of
 the Obligation has not already been accelerated under SECTION 11.1(A), demand
 Borrower to provide cash collateral in an amount equal to 105% of the LC
 Exposure then existing or a Collateral Letter of Credit in accordance with
 SECTION 2.2(H); and (vi) exercise any and all other legal or equitable Rights
 afforded by the Loan Papers, the Laws of the State of Texas, or any other
 applicable jurisdiction as Administrative Agent shall deem appropriate, or
 otherwise, including, but not limited to, the Right to bring suit or other
 proceedings before any Governmental Authority either for specific performance
 of any covenant or condition contained in any of the Loan Papers or in aid of
 the exercise of any Right granted to Administrative Agent or any Lender in any
 of the Loan Papers.

 11.2 COMPANY WAIVERS. To the extent permitted by Law, the Companies and
Guarantors hereby waive presentment and demand for payment, protest, notice of
intention to accelerate, notice of acceleration, and notice of protest and
nonpayment, and agree that their respective liability with respect to the
Obligation (or any part thereof) shall not be affected by any renewal or
extension in the time of payment of the Obligation (or any part thereof), by any
indulgence, or by any release or change in any security for the payment of the
Obligation (or any part thereof).

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<PAGE>
 
      11.3  PERFORMANCE BY ADMINISTRATIVE AGENT. If any covenant, duty,  or
agreement of any Company or Guarantor is not performed in accordance with the
terms of the Loan Papers, after the occurrence and during the continuance of a
Default, Administrative Agent may, at its option (but subject to the approval of
Required Lenders), perform or attempt to perform such covenant, duty, or
agreement on behalf of such Company or Guarantor. In such event, any amount
expended by Administrative Agent in such performance or attempted performance
shall be payable by the Companies and Guarantors, jointly and severally, to
Administrative Agent on demand, shall become part of the Obligation, and shall
bear interest at the Default Rate from the date of such expenditure by
Administrative Agent until paid. Notwithstanding the foregoing, it is expressly
understood that Administrative Agent does not assume, and shall never have,
except by its express written consent, any liability or responsibility for the
performance of any covenant, duty, or agreement of any Company or any Guarantor.

      11.4  DELEGATION OF DUTIES AND RIGHTS. Lenders may perform any of their
duties or exercise any of their Rights under the Loan Papers by or
through their respective Representatives.

      11.5  NOT IN CONTROL. Nothing in any Loan Paper shall, or shall be deemed
to (a) give any Agent or any Lender the Right to exercise control over the
assets (including real property), affairs, or management of any Company or any
Guarantor, (b) preclude or interfere with compliance by any Company or any
Guarantor with any Law, or (c) require any act or omission by any Company or any
Guarantor that may be harmful to Persons or property. Any "MATERIAL ADVERSE
EVENT" or other materiality qualifier in any representation, warranty, covenant,
or other provision of any Loan Paper is included for credit documentation
purposes only and shall not, and shall not be deemed to, mean that
Administrative Agent or any Lender acquiesces in any non-compliance by any
Company or Guarantor with any Law or document, or that any Agent or any Lender
does not expect the Companies or Guarantors to promptly, diligently, and
continuously carry out all appropriate removal, remediation, and termination
activities required or appropriate in accordance with all Environmental Laws.
Administrative Agent and the Lenders have no fiduciary relationship with or
fiduciary duty to Borrower or any Company or Guarantor arising out of or in
connection with the Loan Papers, and the relationship between Administrative
Agent and the Lenders, on the one hand, and Borrower, the Companies, and
Guarantors, on the other hand, in connection with the Loan Papers is solely that
of debtor and creditor. The power of Administrative Agent and Lenders under the
Loan Papers is limited to the Rights provided in the Loan Papers, which Rights
exist solely to assure payment and performance of the Obligation and may be
exercised in a manner calculated by Administrative Agent and Lenders in their
respective good faith business judgment.

          11.6  COURSE OF DEALING. The acceptance by Administrative Agent or
Lenders at any time and from time to time of partial payment on the Obligation
shall not be deemed to be a waiver of any Default then existing. No waiver by
Administrative Agent, Required Lenders, or Lenders of any Default shall be
deemed to be a waiver of any other then-existing or subsequent Default. No delay
or omission by Administrative Agent, Required Lenders, or Lenders in exercising
any Right under the Loan Papers shall impair such Right or be construed as a
waiver thereof or any acquiescence therein, nor shall any single or partial
exercise of any such Right preclude other or further exercise

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<PAGE>
 
thereof, or the exercise of any other Right under the Loan Papers or otherwise.

      11.7  CUMULATIVE RIGHTS. All Rights available to Administrative Agent and
Lenders under the Loan Papers are cumulative of and in addition to all other
Rights granted to Administrative Agent and Lenders at law or in equity, whether
or not the Obligation is due and payable and whether or not Administrative Agent
or Lenders have instituted any suit for collection, foreclosure, or other action
in connection with the Loan Papers.

      11.8  APPLICATION OF PROCEEDS. Any and all proceeds ever received by
Administrative Agent or Lenders from the exercise of any Rights pertaining to
the Obligation shall be applied to the obligation in the order and manner set
forth in SECTION 3.11.

      11.9  CERTAIN PROCEEDINGS. Borrower will promptly execute and deliver, or 
cause the execution and delivery of, all applications, certificates,
instruments, registration statements, and all other documents and papers
Administrative Agent or Lenders may reasonably request in connection with the
obtaining of any consent, approval, registration, qualification, permit,
license, or Authorization of any Governmental Authority or other Person
necessary or appropriate for the effective exercise of any Rights under the Loan
Papers. Because Borrower agrees that Administrative Agent's and Lenders'
remedies at Law for failure of Borrower to comply with the provisions of this
SECTION would be inadequate and that such failure would not be adequately
compensable in damages, Borrower agrees that the covenants of this SECTION may
be specifically enforced.

      11.10 EXPENDITURES BY LENDERS. Borrower shall promptly pay within fifteen
(15) Business Days after request therefor (a) all reasonable out-of-pocket
costs, fees, and expenses paid or incurred by Administrative Agent, incident to
any Loan Paper (including, but not limited to, the reasonable fees and expenses
of counsel to Administrative Agent in connection with the negotiation,
preparation, delivery, execution, coordination and administration of the Loan
Papers and any related amendment, waiver, or consent) and (b) all reasonable
costs and expenses of Lenders and Administrative Agent incurred by
Administrative Agent or any Lender in connection with the enforcement of the
obligations of any Company or Guarantor arising under the Loan Papers
(including, without limitation, costs and expenses incurred in connection with
any workout or bankruptcy) or the exercise of any Rights arising under the Loan
Papers (including, but not limited to, reasonable attorneys' fees, court costs
and other costs of collection), all of which shall be a part of the Obligation
and shall bear interest at the Default Rate from the date due until the date
repaid.

      11.11 INDEMNIFICATION. BORROWER AND EACH GUARANTOR AGREES TO INDEMNIFY
AND HOLD HARMLESS ADMINISTRATIVE AGENT,  EACH LENDER, AND EACH OF THEIR
RESPECTIVE AFFILIATES AND THEIR RESPECTIVE OFFICERS, DIRECTORS, EMPLOYEES,
AGENTS, ATTORNEYS, AND ADVISORS (EACH, AN "INDEMNIFIED PARTY") FROM AND AGAINST
ANY AND ALL CLAIMS, DAMAGES, LOSSES, LIABILITIES, COSTS, AND EXPENSES
(INCLUDING, WITHOUT LIMITATION, REASONABLE ATTORNEYS' FEES) THAT MAY BE
INCURRED BY OR ASSERTED OR AWARDED AGAINST ANY INDEMNIFIED PARTY, IN EACH CASE
ARISING  OUT OF OR IN CONNECTION WITH OR BY REASON OF (INCLUDING, WITHOUT
LIMITATION, IN CONNECTION WITH ANY INVESTIGATION, LITIGATION, OR PROCEEDING OR
PREPARATION OF DEFENSE IN CONNECTION THEREWITH) THE LOAN PAPERS, ANY OF THE

 

                                       77
<PAGE>
 
TRANSACTIONS CONTEMPLATED HEREIN OR THE ACTUAL OR PROPOSED USE OF THE PROCEEDS
OF THE BORROWINGS (INCLUDING ANY OF THE FOREGOING ARISING FROM THE NEGLIGENCE OF
THE INDEMNIFIED PARTY), EXCEPT TO THE EXTENT SUCH CLAIM, DAMAGE, LOSS,
LIABILITY, COST, OR EXPENSE (I) RESULTED FROM SUCH INDEMNIFIED PARTY'S GROSS
NEGLIGENCE OR WILLFUL MISCONDUCT OR (II) AROSE WITH RESPECT TO ANY HAZARDOUS
MATERIAL THAT IS FIRST MANUFACTURED, GENERATED, TREATED, LOCATED, OR STORED ON
ANY REAL PROPERTY OWNED OR OPERATED BY ANY COMPANY ("PROPERTY") AFTER IT IS
TRANSFERRED TO ANY INDEMNIFIED PARTY OR ITS SUCCESSORS BY FORECLOSURE SALE, DEED
IN LIEU OF FORECLOSURE, OR SIMILAR TRANSFER, EXCEPT TO THE EXTENT SUCH
MANUFACTURE, EMISSION, RELEASE, GENERATION, TREATMENT, STORAGE, RELEASE OR
DISPOSAL, OR VIOLATION IS ACTUALLY CAUSED BY ANY COMPANY. IN THE CASE OF AN
INVESTIGATION, LITIGATION OR OTHER PROCEEDING TO WHICH THE INDEMNITY IN THIS
SECTION 11.12 APPLIES, SUCH INDEMNITY SHALL BE EFFECTIVE WHETHER OR NOT SUCH
INVESTIGATION, LITIGATION OR PROCEEDING IS BROUGHT BY THE BORROWER, ITS
DIRECTORS, SHAREHOLDERS OR CREDITORS OR AN INDEMNIFIED PARTY OR ANY OTHER PERSON
OR ANY INDEMNIFIED PARTY IS OTHERWISE A PARTY THERETO AND WHETHER OR NOT THE
TRANSACTIONS CONTEMPLATED HEREBY ARE CONSUMMATED. THE BORROWER AND EACH
GUARANTOR AGREE NOT TO ASSERT ANY CLAIM AGAINST ANY INDEMNIFIED PARTY ON ANY
THEORY OF LIABILITY, FOR SPECIAL, INDIRECT, CONSEQUENTIAL, OR PUNITIVE DAMAGES
ARISING OUT OF OR OTHERWISE RELATING TO THE LOAN PAPERS, ANY OF THE TRANSACTIONS
CONTEMPLATED HEREIN OR THE ACTUAL OR PROPOSED USE OF THE PROCEEDS OF THE
BORROWINGS. WITHOUT PREJUDICE TO THE SURVIVAL OF ANY OTHER AGREEMENT OF THE
BORROWER HEREUNDER, THE AGREEMENTS AND OBLIGATIONS OF THE BORROWER CONTAINED IN
THIS SECTION 11.11 SHALL SURVIVE THE PAYMENT IN FULL OF THE BORROWINGS AND ALL
OTHER AMOUNTS PAYABLE UNDER THIS AGREEMENT.

SECTION 12 AGREEMENT AMONG LENDERS.

      12.1  ADMINISTRATIVE AGENT.
           (a) Each Lender hereby appoints NationsBank, N.A. (and NationsBank,
      N.A. hereby accepts such appointment) as its nominee and agent, in its
      name and on its behalf: (i) to act as nominee for and on behalf of such
      Lender in and under all Loan Papers; (ii) to arrange the means whereby the
      funds of Lenders are to be made available to Borrower under the Loan
      Papers; (iii) to take such action as may be requested by any Lender under
      the Loan Papers (when such Lender is entitled to make such request under
      the Loan Papers and after such requesting Lender has obtained the
      concurrence of such other Lenders as may be required under the Loan
      Papers); (iv) to receive all documents and items to be furnished to
      Lenders under the Loan Papers; (v) to timely distribute, and
      Administrative Agent agrees to so distribute, to each Lender all material
      information, requests, documents, and items received from Borrower under
      the Loan Papers; (vi) to promptly distribute to each Lender its ratable
      part of each payment or prepayment (whether voluntary, as proceeds of
      collateral upon or after foreclosure, as proceeds of insurance thereon, or
      otherwise) in accordance with the terms of the Loan Papers; (vii) to
      deliver to the appropriate Persons requests, demands, approvals, and
      consents received from Lenders; and (viii) to execute, on behalf of
      Lenders, such releases or other documents or instruments as are permitted
      by the Loan Papers or as directed by Lenders from time to time; PROVIDED,
      HOWEVER, Administrative Agent shall not be required to take any action
      which

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<PAGE>
 
     exposes Administrative Agent to personal liability or which is contrary to
     the Loan Papers or applicable Law.

           (b) Administrative Agent may resign at any time as Administrative
      AGENT UNDER the Loan Papers by giving written notice thereof to Lenders
      and Borrower and may be removed as Administrative Agent under the Loan
      Papers at any time with cause by Required Lenders. Should the initial or
      any successor Administrative Agent ever cease to be a party hereto or
      should the initial or any successor Administrative Agent ever resign or be
      removed as Administrative Agent, then Required Lenders shall elect the
      successor Administrative Agent from among the Lenders (other than the
      resigning Administrative Agent), which provided no Potential Default or
      Default then exists shall be reasonably acceptable to Borrower. If no
      successor Administrative Agent shall have been so appointed by Required
      Lenders, within 30 days after the retiring Administrative Agent's giving
      of notice of resignation or Required Lenders' removal of the retiring
      Administrative Agent, then the retiring Administrative Agent may, on
      behalf of Lenders, appoint a successor Administrative Agent, which shall
      be a commercial bank having a combined capital and surplus of at least
      $1,000,000,000 and which, provided no Potential Default or Default then
      exists, shall be reasonably acceptable to Borrower. Upon the acceptance of
      any appointment as Administrative Agent under the Loan Papers by a
      successor Administrative Agent, such successor Administrative Agent shall
      thereupon succeed to and become vested with all the Rights of the retiring
      Administrative Agent, and the retiring Administrative Agent shall be
      discharged from its duties and obligations of Administrative Agent under
      the Loan Papers (PROVIDED, HOWEVER, THAT when used in connection with LCs
      issued and outstanding prior to the appointment of the successor
      Administrative Agent, "ADMINISTRATIVE AGENT" shall continue to refer
      solely to the bank that issued the outstanding LC; PROVIDED FURTHER THAT
      any LCs issued or renewed after the appointment of any successor
      Administrative Agent shall be issued by such successor Administrative
      Agent), and each Lender shall execute such documents as any Lender may
      reasonably request to reflect such change in and under the Loan Papers.
      After any retiring Administrative Agent's resignation or removal as
      Administrative Agent under the Loan Papers, the provisions of this SECTION
      12 shall inure to its benefit as to any actions taken or omitted to be
      taken by it while it was Administrative Agent under the Loan Papers.

           (c) Administrative Agent, in its capacity as a Lender, shall have the
      same Rights under the Loan Papers as any other Lender and may exercise the
      same as though it were not acting as Administrative Agent; the term
      "LENDER" shall, unless the context otherwise indicates, include
      Administrative Agent; and any resignation, or removal of by Administrative
      Agent hereunder shall not impair or otherwise affect any Rights which it
      has or may have in its capacity as an individual Lender. Each Lender and
      Borrower agree that Administrative Agent is not a fiduciary for Lenders or
      for Borrower but simply is acting in the capacity described herein to
      alleviate administrative burdens for both Borrower and Lenders, that
      Administrative Agent has no duties or responsibilities to Lenders or
      Borrower except those expressly set forth herein, and that Administrative
      Agent in its capacity as a Lender

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<PAGE>
 
 has all Rights of any other Lender.

      (d) Administrative Agent and its Affiliates may now or hereafter be
 engaged in one or more loan, letter of credit, leasing, or other financing
 transactions with Borrower, act as trustee or depositary for Borrower, or
 otherwise be engaged in other transactions with Borrower (collectively, the
 "OTHER ACTIVITIES") not the subject of the Loan Papers. Without limiting the
 Rights of Lenders specifically set forth in the Loan Papers, Administrative
 Agent and its Affiliates shall not be responsible to account to Lenders for
 such other activities, and no Lender shall have any interest in any other
 activities, any present or future guaranties by or for the account of Borrower
 which are not contemplated or included in the Loan Papers, any present or
 future offset exercised by Administrative Agent and its Affiliates in respect
 of such other activities, any present or future property taken as security for
 any such other activities, or any property now or hereafter in the possession
 or control of Administrative Agent or its Affiliates which may be or become
 security for the obligations of Borrower arising under the Loan Papers by
 reason of the general description of indebtedness secured or of property
 contained in any other agreements, documents or instruments related to any such
 other activities; PROVIDED THAT, if any payments in respect of such guaranties
 or such property or the proceeds thereof shall be applied to reduction of the
 obligations of Borrower arising under the Loan Papers, then each Lender shall
 be entitled to share in such application ratably.

      12.2  EXPENSES. Upon demand by Administrative Agent, each Lender shall
pay its Pro Rata Part of any reasonable expenses (including, without
limitation, court costs, reasonable attorneys' fees, and other  costs of
collection) incurred by Administrative Agent in connection with any of the Loan
Papers if and to the extent Administrative Agent does not receive reimbursement
therefor from other sources within 60 days after incurred; PROVIDED THAT, each
Lender  shall be entitled to receive its Pro Rata Part of any reimbursement for
such expenses,  or part thereof, which Administrative Agent subsequently
receives from such other sources.

      12.3 PROPORTIONATE ABSORPTION OF LOSSES. Except as otherwise provided in
the Loan Papers, nothing in the Loan Papers shall be deemed to give any Lender
any advantage over any other Lender insofar as the Obligation arising under the
Loan Papers is concerned, or to relieve any Lender from absorbing its Pro Rata
Part of any losses sustained with respect to the Obligation (except to the
extent such losses result from unilateral actions or inactions of any Lender
that are not made in accordance with the terms and provisions of the Loan
Papers).

      12.4 DELEGATION OF DUTIES; RELIANCE. Administrative Agent may perform any
of its duties or exercise any of its Rights under the Loan Papers by or through
its Representatives. Administrative Agent and its Representatives shall (a) be
entitled to rely upon (and shall be protected in relying upon) any writing,
resolution, notice, consent, certificate, affidavit, letter, cablegram,
telecopy, telegram, telex or teletype message, statement, order, or other
documents or conversation believed by it or them to be genuine and correct and
to have been signed or made by the proper Person and, with respect

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to legal matters, upon opinion of counsel selected by Administrative Agent,
(b) be entitled to deem and treat each Lender as the owner and holder of the
Revolver Principal Debt owed to such Lender  for all purposes until, subject to
SECTION 13.13, written notice of the assignment  or transfer thereof shall have
been given to and received by Administrative Agent (and any request,
authorization, consent, or approval of any Lender shall be conclusive  and
binding on each subsequent holder, assignee, or transferee of the  Revolver
Principal Debt owed to such Lender or portion thereof until such notice  is
given and received), (c) not be deemed  to have notice of the occurrence of a
Default unless a responsible officer of Administrative Agent, who  handles
matters associated with the Loan Papers and transactions thereunder,  has
received  written notice from a Lender or Borrower and stating that such notice
is a "NOTICE OF DEFAULT," and  (d) be entitled to consult with legal counsel
(including counsel for Borrower), independent accountants, and  other experts
selected by Administrative Agent and shall not be liable for any action  taken
or omitted to be taken in good faith by it in accordance with the advice of
such counsel, accountants or experts.

 12.5 COLLATERAL MATTERS.

      (a) Each Lender authorizes and directs Administrative Agent to enter into
 the Loan Papers for the Lenders' Liens and agrees that any action taken by
 Administrative Agent concerning any Collateral (with the consent or at the
 request of Required Lenders) in accordance with any Loan Paper, that
 Administrative Agent's exercise (with the consent or at the request of Required
 Lenders) of powers concerning the Collateral in any Loan Paper, and that all
 other reasonably incidental powers are authorized and binding upon all Lenders.

      (b) Administrative Agent is authorized on behalf of all Lenders, without
 the necessity of any notice to or further consent from any Lender, from time to
 time before a Default or Potential Default, to take any action with respect to
 any Collateral or Loan Papers related to Collateral that may be necessary to
 perfect and maintain perfected the Lender's Liens upon the Collateral.

      (c) Except to use the same standard of care that it ordinarily uses for
 collateral for its sole benefit, Administrative Agent has no obligation
 whatsoever to any Lender or to any other Person to assure that the Collateral
 exists or is owned by any Company or is cared for, protected, or insured or has
 been encumbered or that the Lender's Liens have been properly or sufficiently
 or lawfully created, perfected, protected, or enforced or are entitled to any
 particular priority.

      (d) Administrative Agent shall exercise the same care and prudent judgment
 with respect to the Collateral and the Loan Papers as it normally and
 customarily exercises in respect of similar collateral and security documents.

      (e) Lenders irrevocably authorize Administrative Agent, at its option and
 in its discretion, to release any Lenders' Lien upon any Collateral (i) in
 accordance with SECTION 9.24, (ii) constituting property being disposed of as
 permitted under any Loan Paper, (iii) constituting property in which no
 Company owned any interest at

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 the time the Lenders' Lien was granted or at any time after that, (iv)
 constituting property leased to any Company under a lease that has expired or
 been terminated in a transaction permitted under the Loan Papers or is about to
 expire and that has not been, and is not intended by that Company to be,
 renewed, (v) consisting of an instrument evidencing Debt pledged to
 Administrative Agent (for the benefit of Lenders), if the underlying Debt has
 been paid in full, or (vi) if approved, authorized, or ratified in writing by
 Lenders in accordance with SECTION 13.11(B)(IV). Upon request by Administrative
 Agent at any time, Lenders shall confirm in writing Administrative Agent's
 authority to release particular types or items of Collateral under this CLAUSE
 (E).

 12.6 LIMITATION OF LIABILITY.

      (a) Neither Administrative Agent nor any of its Representatives shall be
 liable for any action taken or omitted to be taken by it or them under the Loan
 Papers in good faith and reasonably believed by it or them to be within the
 discretion or power conferred upon it or them by the Loan Papers or be
 responsible for the consequences of any error of judgment, except for fraud,
 gross negligence, or willful misconduct; and neither Administrative Agent nor
 any of its Representatives has a fiduciary relationship with any Lender by
 virtue of the Loan Papers (PROVIDED THAT, nothing herein shall negate the
 obligation of Administrative Agent to account for funds received by it for the
 account of any Lender).

      (b) Unless indemnified to its satisfaction against loss, cost, liability,
 and expense, Administrative Agent shall be not compelled to do any act under
 the Loan Papers or to take any action toward the execution or enforcement of
 the powers thereby created or to prosecute or defend any suit in respect of the
 Loan Papers. If Administrative Agent requests instructions from Lenders or
 Required Lenders, as the case may be, with respect to any act or action
 (including, but not limited to, any failure to act) in connection with any Loan
 Paper, Administrative Agent shall be entitled (but shall not be required) to
 refrain (without incurring any liability to any Person by so refraining) from
 such act or action unless and until it has received such instructions. Except
 where action of Required Lenders or all Lenders is required in the Loan Papers,
 Administrative Agent may act hereunder in its own discretion without requesting
 instructions. In no event, however, shall Administrative Agent or any of its
 respective Representatives be required to take any action which it or they
 determine could incur for it or them criminal or onerous civil liability.
 Without limiting the generality of the foregoing, no Lender shall have any
 right of action against Administrative Agent as a result of Administrative
 Agent's acting or refraining from acting hereunder in accordance with the
 instructions of Required Lenders (or all Lenders if required in the Loan
 Papers).

      (c) Administrative Agent shall not be responsible in any manner to any
 Lender or any Participant for, and each Lender represents and warrants that it
 has not relied upon Administrative Agent in respect of, (i) the
 creditworthiness of any Company or any Guarantor and the

 

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      risks involved to such Lender, (ii) the effectiveness, enforceability,
      genuineness, validity, or the due execution of any Loan Paper, (iii) any
      representation, warranty, document, certificate, report, or statement made
      therein or furnished thereunder or in connection therewith, (iv) the
      existence, priority, or perfection of any Lien hereafter granted or
      purported to be granted under any Loan Paper, or (v) observation of or
      compliance with any of the terms, covenants, or conditions of any Loan
      Paper on the part of any Company or Guarantor. Each Lender agrees to
      indemnify Administrative Agent or its Representatives and hold them
      harmless from and against (but limited to such Lender's Pro Rata Part of)
      any and all liabilities, obligations, losses, damages, penalties, actions,
      judgments, suits, costs, reasonable expenses, and reasonable disbursements
      of any kind or nature whatsoever which may be imposed on, asserted
      against, or incurred by them in any way relating to or arising out of the
      Loan Papers or any action taken or omitted by them under the Loan Papers
      (INCLUDING ANY OF THE FOREGOING ARISING FROM THE NEGLIGENCE OF
      ADMINISTRATIVE AGENT OR ITS REPRESENTATIVES), to the extent Administrative
      Agent and its respective Representatives are not reimbursed for such
      amounts by any Company (PROVIDED THAT, Administrative Agent, and its
      Representatives shall not have the right to be indemnified hereunder for
      its or their own fraud, gross negligence, or willful misconduct).

      12.7  DEFAULT; COLLATERAL. Upon the occurrence and continuance of a
Default, Lenders agree to promptly confer in order that Required Lenders or
Lenders, as the case may be, may agree upon a course of action for the
enforcement of the Rights of Lenders; and Administrative Agent shall be entitled
to refrain from taking any action (without incurring any liability to any Person
for so refraining) unless and until Administrative Agent shall have received
instructions from Required Lenders. All rights of action under this Agreement
and under the Notes and all rights to the Collateral, if any, hereunder may be
enforced by Administrative Agent and any suit or proceeding instituted by
Administrative Agent in furtherance of such enforcement shall be brought in its
name as Administrative Agent without the necessity of joining as plaintiffs or
defendants any other Lender, and the recovery of any judgment shall be for the
benefit of Lenders subject to the expenses of Administrative Agent. In actions
with respect to any property of Borrower, Administrative Agent is acting for the
ratable benefit of each Lender. Any and all agreements to subordinate (whether
made heretofore or hereafter) other indebtedness or obligations of Borrower to
the Obligation shall be construed as being for the ratable benefit of each
Lender.

      12.8  LIMITATION OF LIABILITY. To the extent permitted by Law, (a)
Administrative Agent (acting in its agent capacities) shall not incur any
liability to any other Lender or Participant except for acts or omissions
resulting from its own fraud, gross negligence or wilful misconduct, and (b)
neither Administrative Agent nor any Lender, or Participant shall incur any
liability to any other Person for any act or omission of any other Lender,
Agent, or Participant.

      12.9  RELATIONSHIP OF LENDERS. Nothing herein shall be construed as
creating a partnership or joint venture among Agents and Lenders.

      12.10 BENEFITS OF AGREEMENT. Except for the representations and

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covenants in SECTIONS 12.1(B), 12.1(C), and 12.9 in favor of Borrower, none of
the provisions of this SECTION 12 shall inure to the benefit of any Company,
Guarantor, or any other Person other than Lenders; consequently, no Company,
Guarantor, or any other Person shall be entitled to rely upon, or to raise as a
defense, in any manner whatsoever, the failure of any Agent or any Lender to
comply with such provisions.

      12.11 OBLIGATIONS SEVERAL. The obligations of Lenders hereunder are
several, and each Lender hereunder shall not be responsible for the obligations
of the other Lenders hereunder, nor will the failure of one Lender to perform
any of its obligations hereunder relieve the other Lenders from the performance
of their respective obligations hereunder.

SECTION 13   MISCELLANEOUS.

      13.1  HEADINGS. The headings, captions, and arrangements used in any of
the Loan Papers are, unless specified otherwise, for convenience only and shall
not be deemed to limit, amplify, or modify the terms of the Loan Papers, nor
affect the meaning thereof.

      13.2  NONBUSINESS DAYS. In any case where any payment or action is due
under any Loan Paper on a day which is not a Business Day, such payment or
action may be delayed until the next-succeeding Business Day, but interest and
fees shall continue to accrue in respect of any payment to which it is
applicable until such payment is in fact made; PROVIDED THAT, if, in the case of
any such payment in respect of a Eurodollar Rate Borrowing, the next-succeeding
Business Day is in the next calendar month, then such payment shall be made on
the next-preceding Business Day.

        13.3  COMMUNICATIONS. Unless specifically otherwise provided, whenever
any Loan Paper requires or permits any consent, approval, notice, request, or
demand from one party to another, such communication must be in writing (which
may be by telex or telecopy) to be effective and shall be deemed to have been
given (a) if by telex, when transmitted to the telex number, if any, for such
party, and the appropriate answer back is received, (b) if by telecopy, when
transmitted to the telecopy number for such party (and all such communications
sent by telecopy shall be confirmed promptly thereafter by personal delivery or
mailing in accordance with the provisions of this SECTION; PROVIDED, THAT any
requirement in this parenthetical shall not affect the date on which such
telecopy shall be deemed to have been delivered), (c) if by mail, on the third
Business Day after it is enclosed in an envelope, properly addressed to such
party, properly stamped, sealed, and deposited in the appropriate official
postal service, or (d) if by any other means, when actually delivered to such
party. Until changed by notice pursuant hereto, the address (and telex and
telecopy numbers, if any) for Administrative Agent and each Lender and
Administrative Agent, is set forth on SCHEDULE 2.1, and for Borrower and each
Company is the address set forth by Borrower's signature on the signature page
of this Agreement and for each Guarantor is the address set forth by such
Guarantor's signature on the signature page of its Guaranty. A copy of each
communication to Administrative Agent shall also be sent to Haynes and Boone,
L.L.P., 901 Main Street, Dallas, Texas 75202, Fax: 214/651-5940, Attn: Sue P.
Murphy.

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<PAGE>
 
      13.4  FORM AND NUMBER   OF  DOCUMENTS. Each agreement,  document,
instrument, or other writing to be furnished under any  provision  of this
Agreement must  be in form and substance and in such number of counterparts as
may be reasonably satisfactory to Administrative Agent and its counsel.

      13.5 EXCEPTIONS TO COVENANTS. No Company or Guarantor shall take any
action or fail to take any action which is permitted as an exception to any of
the covenants contained in any Loan Paper if such action or omission would
result in the breach of any other covenant contained in any of the Loan Papers.
 
      13.6 SURVIVAL. All covenants, agreements, undertakings, representations,
and warranties made in any of the Loan Papers shall survive all closings under
the Loan Papers and, except as otherwise indicated, shall not be affected by any
investigation made by any party. All rights of, and provisions relating to,
reimbursement and indemnification of Administrative Agent or any Lender shall
survive termination of this Agreement and payment in full of the Obligation.
 
      13.7 GOVERNING LAW. THE LAWS OF THE STATE OF TEXAS AND OF THE UNITED
STATES OF AMERICA SHALL GOVERN THE RIGHTS AND DUTIES OF THE PARTIES TO THE LOAN
PAPERS AND THE VALIDITY, CONSTRUCTION, ENFORCEMENT, AND INTERPRETATION OF THE
LOAN PAPERS.
 
      13.8 INVALID PROVISIONS. If any provision in any Loan Paper is held to be
illegal, invalid, or unenforceable, such provision shall be fully severable; the
appropriate Loan Paper shall be construed and enforced as if such provision had
never comprised a part thereof; and the remaining provisions thereof shall
remain in full force and effect and shall not be affected by such provision or
by its severance therefrom. Administrative Agent, Lenders, and each Company and
Guarantor party to such Loan Paper agree to negotiate, in good faith, the terms
of a replacement provision as similar to the severed provision as may be
possible and be legal, valid, and enforceable.
 
      13.9 ENTIRETY. THE RIGHTS AND OBLIGATIONS OF THE COMPANIES, GUARANTORS,
LENDERS, AND ADMINISTRATIVE AGENT SHALL BE DETERMINED SOLELY FROM WRITTEN
AGREEMENTS, DOCUMENTS, AND INSTRUMENTS, AND ANY PRIOR ORAL AGREEMENTS BETWEEN
SUCH PARTIES ARE SUPERSEDED BY AND MERGED INTO SUCH WRITINGS. THIS AGREEMENT (AS
AMENDED IN WRITING FROM TIME TO TIME) AND THE OTHER WRITTEN LOAN PAPERS EXECUTED
BY ANY COMPANY, ANY GUARANTOR, ANY LENDER, AND/OR ANY AGENT, (TOGETHER WITH ALL
COMMITMENT LETTERS AND FEE LETTERS AS THEY RELATE TO THE PAYMENT OF FEES AFTER
THE CLOSING DATE) REPRESENT THE FINAL AGREEMENT BETWEEN THE COMPANIES, THE
GUARANTORS, LENDERS, AND AGENTS, AND MAY NOT BE CONTRADICTED BY EVIDENCE OF
PRIOR, CONTEMPORANEOUS, OR SUBSEQUENT ORAL AGREEMENTS BY SUCH PARTIES. THERE ARE
NO UNWRITTEN ORAL AGREEMENTS BETWEEN SUCH PARTIES.
 
      13.10 JURISDICTION; VENUE; SERVICE OF PROCESS; JURY TRIAL. EACH PARTY
HERETO, IN EACH CASE FOR ITSELF, ITS SUCCESSORS AND ASSIGNS, HEREBY (A)
IRREVOCABLY SUBMITS THE NONEXCLUSIVE JURISDICTION OF THE STATE AND FEDERAL
COURTS LOCATED IN TEXAS, AND AGREES AND CONSENTS THAT SERVICE OF PROCESS MAY BE
MADE UPON IT IN ANY LEGAL PROCEEDING ARISING OUT OF OR IN CONNECTION WITH THE
LOAN PAPERS AND THE OBLIGATION BY SERVICE OF PROCESS AS PROVIDED BY TEXAS LAW,
(B) IRREVOCABLY WAIVES, TO THE FULLEST EXTENT PERMITTED BY LAW, ANY OBJECTION
WHICH IT MAY NOW OR HEREAFTER HAVE TO THE LAYING OF VENUE OF ANY LITIGATION
ARISING OUT OF OR IN CONNECTION WITH THE LOAN PAPERS AND THE

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<PAGE>
 
OBLIGATION BROUGHT IN ANY SUCH COURT, (C) IRREVOCABLY WAIVES ANY CLAIMS THAT ANY
LITIGATION BROUGHT IN ANY SUCH COURT HAS BEEN BROUGHT IN AN INCONVENIENT FORUM,
(D) AGREES TO DESIGNATE AND MAINTAIN AN AGENT FOR SERVICE OF PROCESS IN TEXAS IN
CONNECTION WITH ANY SUCH LITIGATION AND TO DELIVER TO ADMINISTRATIVE AGENT
EVIDENCE THEREOF, IF REQUESTED, (E) IRREVOCABLY CONSENTS TO THE SERVICE OF
PROCESS OUT OF ANY OF THE AFOREMENTIONED COURTS IN ANY SUCH LITIGATION BY THE
MAILING OF COPIES THEREOF BY CERTIFIED MAIL, RETURN RECEIPT REQUESTED, POSTAGE
PREPAID, AT ITS ADDRESS SET FORTH HEREIN, (F) IRREVOCABLY AGREES THAT ANY LEGAL
PROCEEDING AGAINST ANY PARTY HERETO ARISING OUT OF OR IN CONNECTION WITH THE
LOAN PAPERS OR THE OBLIGATION SHALL BE BROUGHT IN ONE OF THE AFOREMENTIONED
COURTS, AND (G) IRREVOCABLY WAIVES, TO THE FULLEST EXTENT PERMITTED BY LAW, ITS
RESPECTIVE RIGHTS TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION BASED UPON OR
ARISING OUT OF ANY LOAN PAPER OR THE TRANSACTIONS CONTEMPLATED THEREBY. The
scope of each of the foregoing waivers is intended to be all-encompassing of any
and all disputes that may be filed in any court and that relate to the subject
matter of this transaction, including, without limitation, contract claims, tort
claims, breach of duty claims, and all other common law and statutory claims.
The Companies, Guarantors, and each other party to this Agreement acknowledge
that this waiver is a material inducement to the agreement of each party hereto
to enter into a business relationship, that each has already relied on this
waiver in entering into this Agreement, and each will continue to rely on each
of such waivers in related future dealings. The Companies, Guarantors, and each
other party to this Agreement warrant and represent that they have reviewed
these waivers with their legal counsel, and that they knowingly and voluntarily
agree to each such waiver following consultation with legal counsel. THE WAIVERS
IN THIS SECTION 13.10 ARE IRREVOCABLE, MEANING THAT THEY MAY NOT BE MODIFIED
EITHER ORALLY OR IN WRITING, AND THESE WAIVERS SHALL APPLY TO ANY SUBSEQUENT
AMENDMENTS, SUPPLEMENTS, AND REPLACEMENTS TO OR OF THIS OR ANY OTHER LOAN PAPER.
In the event of Litigation, this Agreement may be filed as a written consent to
a trial by the court.

13.11 AMENDMENTS, CONSENTS, CONFLICTS, AND WAIVERS.

           (a) Except as otherwise specifically provided, (i) this Agreement may
      only be amended, modified or waived by an instrument in writing executed
      jointly by Borrower and Required Lenders, and, in the case of any matter
      affecting Administrative Agent (EXCEPT removal of Administrative Agent as
      provided in SECTION 12) by Administrative Agent, and may only be
      supplemented by documents delivered or to be delivered in accordance with
      the express terms hereof, and (ii) the other Loan Papers may only be the
      subject of an amendment, modification, or waiver if Borrower and Required
      Lenders, and, in the case of any matter affecting Administrative Agent
      (EXCEPT as set forth above), Administrative Agent, have approved same.

           (b) Any amendment to or consent or waiver under this Agreement or any
      Loan Paper which purports to accomplish any of the following must be by an
      instrument in writing executed by Borrower and executed (or approved, as
      the case may be) by each Lender, and, in the case of any matter affecting
      Administrative Agent, by Administrative Agent: (i) extends the due date or
      reduces the amount of any scheduled payment of the Obligation or any
      scheduled reduction of the Revolver Commitment beyond the date specified
      in the Loan Papers; (ii) reduces the

 

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 interest rate or decreases the amount of interest, fees, or other sums
 payable to Administrative Agent or Lenders hereunder (except such reductions as
 are contemplated by this Agreement); (iii) changes the definition of
 "APPLICABLE MARGIN" or "APPLICABLE MARGIN FOR COMMITMENT FEES" (other than
 changes having the effect of increasing such Applicable Margin or Applicable
 Margin for Commitment Fees)," "REQUIRED LENDERS," "REVOLVER COMMITMENT,"
 "TERMINATION DATE," "PRO RATA," or "PRO RATA PART," or (iv) except as otherwise
 permitted by any Loan Paper, waives compliance with, amends, or releases (in
 whole or in part) any Guaranty or releases (in whole or in part) any Collateral
 for the Obligation; or (v) changes this CLAUSE (B) or any other matter
 specifically requiring the consent of all Lenders hereunder. Without the
 consent of such Lender, no Lender's "COMMITTED SUM" may be increased.

      (c) Any conflict or ambiguity between the terms and provisions herein and
 terms and provisions in any other Loan Paper shall be controlled by the terms
 and provisions herein.

      (d) No course of dealing nor any failure or delay by Administrative Agent,
 any Lender, or any of their respective Representatives with respect to
 exercising any Right of Administrative Agent or any Lender hereunder shall
 operate as a waiver thereof. A waiver must be in writing and signed by
 Administrative Agent and Required Lenders (or by all Lenders, if required
 hereunder) to be effective, and such waiver will be effective only in the
 specific instance and for the specific purpose for which it is given.

 13.12 MULTIPLE COUNTERPARTS. This Agreement may be executed in a number of
identical counterparts, each of which shall be deemed an original for all
purposes and all of which constitute, collectively, one agreement; but, in
making proof of this Agreement, it shall not be necessary to produce or account
for more than one such counterpart. It is not necessary that each Lender execute
the same counterpart so long as identical counterparts are executed by Borrower,
each Lender, and Administrative Agent. This Agreement shall become effective
when counterparts hereof shall have been executed and delivered to
Administrative Agent by each Lender, Administrative Agent, and Borrower, or,
when Administrative Agent shall have received telecopied, telexed, or other
evidence satisfactory to it that such party has executed and is delivering to
Administrative Agent a counterpart hereof.

 13.13 SUCCESSORS AND ASSIGNS; ASSIGNMENTS AND PARTICIPATIONS.

      (a) This Agreement shall be binding upon, and inure to the benefit of the
 parties hereto and their respective successors and assigns, EXCEPT THAT (i)
 Borrower may not, directly or indirectly, assign or transfer, or attempt to
 assign or transfer, any of its Rights, duties or obligations under any Loan
 Papers without the express written consent of all Lenders, and (ii) EXCEPT as
 permitted under this SECTION, no Lender may transfer, pledge, assign, sell any
 participation in, or otherwise encumber its portion of the Obligation.

      (b) Each Lender may assign to one or more Eligible Assignees all or a
 portion of its Rights and obligations under this Agreement and the

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<PAGE>
 
 other Loan Papers (including, without limitation, all or a portion of its
 Borrowings and its Notes); PROVIDED, HOWEVER, that:

           (i) each such assignment shall be to an Eligible Assignee;

           (ii) except in the case of an assignment to another Lender or an
      assignment of all of a Lender's Rights and obligations under this
      Agreement and the other Loan Papers, any such partial assignment shall be
      in an amount at least equal to $5,000,000, but, in no event less than
      $1,000,000;

           (iii) each such assignment by a Lender shall be of a constant, and
      not varying, percentage of all of its Rights and obligations under this
      Agreement and the Notes;

           (iv) the parties to such assignment shall execute and deliver to the
      Administrative Agent for its acceptance an Assignment and Acceptance
      Agreement in the form of EXHIBIT F hereto, together with any Notes subject
      to such assignment and a processing fee of $3,500.

 Upon execution, delivery, and acceptance of such Assignment and Acceptance
 Agreement, the assignee thereunder shall be a party hereto and, to the extent
 of such assignment, have the obligations, Rights, and benefits of a Lender
 under the Loan Papers and the assigning Lender shall, to the extent of such
 assignment, relinquish its rights and be released from its obligations under
 the Loan Papers. Upon the consummation of any assignment pursuant to this
 SECTION, but only upon the request of the assignor or assignee made through
 Administrative Agent, Borrower shall issue appropriate Notes to the assignor
 and the assignee, reflecting such Assignment and Acceptance. If the assignee is
 not incorporated under the laws of the United States of America or a state
 thereof, it shall deliver to Borrower and Administrative Agent certification as
 to exemption from deduction or withholding of Taxes in accordance with SECTION
 4.6.

      (c) Administrative Agent shall maintain at its address referred to in
 SECTION 13.3 a copy of each Assignment and Acceptance Agreement delivered to
 and accepted by it and a register for the recordation of the names and
 addresses of the Lenders and the Commitment, and principal amount of the
 Borrowings owing to, each Lender from time to time (the "REGISTER"). The
 entries in the Register shall be conclusive and binding for all purposes,
 absent manifest error, and Borrower, Administrative Agent and the Lenders may
 treat each Person whose name is recorded in the Register as a Lender hereunder
 for all purposes of the Loan Papers. The Register shall be available for
 inspection by Borrower or any Lender at any reasonable time and from time to
 time upon reasonable prior notice. Upon the consummation of any assignment in
 accordance with this SECTION 13.13, SCHEDULE 2.1 shall automatically be deemed
 amended (to the extent required) by Administrative Agent to reflect the name,
 address, and respective Committed Sums under the Revolving Facility of the
 assignor and assignee.

      (d) Upon its receipt of an Assignment and Acceptance Agreement

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<PAGE>
 
   executed by the parties thereto, together with any Notes subject to such
   assignment and payment of the processing fee, the Administrative Agent shall,
   if such Assignment and Acceptance has been completed and is in substantially
   the form of EXHIBIT F hereto, (i) accept such Assignment and Acceptance
   Agreement, (ii) record the information contained therein in the Register and
   (iii) give prompt notice thereof to the parties thereto.

      (e) Subject to the provisions of this SECTION and in accordance with
   applicable Law, any Lender may, in the ordinary course of its commercial
   banking business and in accordance with applicable Law, at any time sell to
   one or more Persons (each a "PARTICIPANT") participating interests in its
   portion of the Obligation. In the event of any such sale to a Participant,
   (i) such Lender shall remain a "LENDER" under this Agreement and the
   Participant shall not constitute a "LENDER" hereunder, (ii) such Lender's
   obligations under this Agreement shall remain unchanged, (iii) such Lender
   shall remain solely responsible for the performance thereof, (iv) such Lender
   shall remain the holder of its share of the Revolver Principal Debt for all
   purposes under this Agreement, (v) Borrower and Administrative Agent shall
   continue to deal solely and directly with such Lender in connection with such
   Lender's Rights and obligations under the Loan Papers, and (vi) such Lender
   shall be solely responsible for any withholding taxes or any filing or
   reporting requirements relating to such participation and shall hold Borrower
   and Administrative Agent and their respective successors, permitted assigns,
   officers, directors, employees, agents, and representatives harmless against
   the same. Participants shall have no Rights under the Loan Papers, other than
   certain voting Rights as provided below. Subject to the following, each
   Lender shall be entitled to obtain (on behalf of its Participants) the
   benefits of SECTION 4 with respect to all participations in its part of the
   Obligation outstanding from time to time SO LONG AS Borrower shall not be
   obligated to pay any amount in excess of the amount that would be due to such
   Lender under SECTION 4 calculated as though no participations have been made.
   No Lender shall sell any participating interest under which the Participant
   shall have any Rights to approve any amendment, modification, or waiver of
   any Loan Paper, except to the extent such amendment, modification, or waiver
   extends the due date for payment of any amount in respect of principal (OTHER
   THAN mandatory prepayments), interest, or fees due under the Loan Papers,
   reduces the interest rate or the amount of principal or fees applicable to
   the Obligation (EXCEPT such reductions as are contemplated by this
   Agreement), or releases any material Guaranty or all or any substantial
   portion of the Collateral for the obligation under the Loan Papers (EXCEPT
   such releases as are contemplated by this Agreement); PROVIDED THAT, in those
   cases where a Participant is entitled to the benefits of SECTION 4 or a
   Lender grants Rights to its Participants to approve amendments to or waivers
   of the Loan Papers respecting the matters previously described in this
   sentence, such Lender must include a voting mechanism in the relevant
   participation agreement or agreements, as the case may be, whereby a majority
   of such Lender's portion of the Obligation (whether held by such Lender or
   Participant) shall control the vote for all of such Lender's portion of the
   Obligation. Except in the case of the sale of a participating interest to
   another Lender, the

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<PAGE>
 
 relevant participation agreement shall not permit the Participant to
 transfer, pledge, assign, sell participations in, or otherwise encumber its
 portion of the obligation, unless the consent of the transferring Lender (which
 consent will not be unreasonably withheld) has been obtained.

      (f) Notwithstanding any other provision set forth in this Agreement, any
 Lender may at any time assign and pledge all or any portion of its Borrowings
 and its Notes to any Federal Reserve Bank as collateral security pursuant to
 Regulation A and any Operating Circular issued by such Federal Reserve Bank. No
 such assignment shall release the assigning Lender from its obligations
 hereunder.

      (g) Any Lender may furnish any information concerning the Companies or the
 Guarantors in the possession of such Lender from time to time to Eligible
 Assignees and Participants (including prospective Eligible Assignees and
 Participants), subject to the provisions of SECTION 13.14.

 13.14 CONFIDENTIALITY. Administrative Agent and Lenders hereby agree to
keep (and to cause their respective Affiliates, employees, directors, agents,
attorneys, accountants and all other professional advisors to keep) confidential
all information delivered to them by or on behalf of the Companies to the extent
that such information has been stated expressly by or on behalf of the Companies
to be confidential; PROVIDED that all information delivered to Administrative
Agent and Lenders prior to the date hereof shall be considered confidential,
PROVIDED FURTHER that nothing herein shall prevent Administrative Agent and
Lenders from disclosing any such information (a) to prospective Lenders and
Participants (but only if such persons agree to be bound by the confidentiality
provisions hereof), (b) to Administrative Agent's and Lenders' Affiliates and
their employees, directors, agents, attorneys, accountants and other
professional advisors, who have a need to know such information in connection
with the Loan Papers, (c) in compliance with agency request, a subpoena or other
court process or otherwise as required by law, or (d) which has been publicly
disclosed other than in breach of this Agreement.

 13.15 CHAPTER 346. Borrower, Administrative Agent, and Lenders hereby
agree that, the provisions of Chapter 346 of the Texas Finance Code, as amended
(regulating certain revolving credit loans and revolving tri-party accounts)
shall not apply to the Loan Papers.

 13.16 DEFAULTING LENDER. Each Lender understands and agrees that if such Lender
is a Defaulting Lender then notwithstanding the provisions of SECTION 13.11 it
shall not be entitled to vote on any matter requiring the consent of the
Required Lenders or to object to any matter requiring the consent of all the
Lenders; provided, however, that all other benefits and obligations under the
Loan Papers shall apply to such Defaulting Lender.

 13.17  DISCHARGE ONLY UPON PAYMENT IN FULL; REINSTATEMENT IN CERTAIN
CIRCUMSTANCES. The obligations of each Company and each Guarantor under the Loan
Papers shall remain in full force and effect until termination of the Revolver
Commitment and payment in full of the Revolver Principal Debt and of all
interest, fees, and other amounts of the Obligation then due and owing, (and
termination of all outstanding LCs with any Lender, if any, or provision

                                       90
<PAGE>
 
of cash collateral or a Collateral Letter of Credit pursuant to SECTION 2.2(H)
UNLESS such Lender shall otherwise consent) EXCEPT that SECTIONS 4, 11, and 13,
and any other provisions under the Loan Papers expressly intended to survive by
the terms hereof or by the terms of the applicable Loan Papers, shall survive
such termination. If at any time any payment of the principal of or interest on
any Note or any other amount payable by Borrower under any Loan Paper is
rescinded or must be otherwise restored or returned upon the insolvency,
bankruptcy, or reorganization of Borrower or otherwise, the obligations of each
Company and each Guarantor under the Loan Papers with respect to such payment
shall be reinstated as though such payment had been due but not made at such
time.

                    [REMAINDER OF PAGE INTENTIONALLY BLANK.
                           SIGNATURE PAGES FOLLOW.]

 

                                       91
<PAGE>
 
      Signature Page to that certain Revolving Credit Agreement dated as of July
10, 1998, among Integrated Orthopaedics, Inc., as Borrower, NationsBank, N.A.,
as Administrative Agent, and certain Lenders named therein.

      EXECUTED as of the 10th day of July, 1998, but effective as of the Closing
Date.

                             INTEGRATED ORTHOPAEDICS, INC.
      
                             By:  /S/ RONALD E. PIERCE
                                  ---------------------------------------
                                  Ronald E. Pierce
                                  President and Chief Executive Officer

Mailing Address:

5858 Westheimer, Suite 500
Houston, Texas 77057
Attention: Ronald E. Pierce
Telecopy No.: (713) 361-2000

                                       92
<PAGE>
 
    Signature Page to that certain Revolving Credit Agreement dated as of July
10, 1998, among Integrated Orthopaedics, Inc., as Borrower, NationsBank, N.A.,
as Administrative Agent, and certain Lenders named therein.

    EXECUTED as of the 10th day of July, 1998, but effective as of the Closing
Date.

                             NATIONSBANK, N.A.,
   
                             AS ADMINISTRATIVE AGENT AND AS A LENDER
   
                             By:  /S/ MARGARET H. BARRADAS
                                  --------------------------------------------
                                  Margaret H. Barradas
                                  Senior Vice President

                                       93
<PAGE>
 
    Signature Page to that certain Credit Agreement dated as of July 10, 1998,
among Integrated Orthopaedics, Inc., as Borrower, NationsBank, N.A., as
Administrative Agent, and certain Lenders named therein.

    Each of the undersigned Guarantors hereby acknowledges that it has reviewed
this Credit Agreement and agrees that certain of the representations and
covenants contained in SECTIONS 6, 8 and 9 apply to Guarantors:

                                    IOI MANAGEMENT SERVICES
                                      OF CONNECTICUT, INC.
                             
                                    IOI MANAGEMENT SERVICES
                                      OF LOUISIANA, INC.
                             
                                    IOI MANAGEMENT SERVICES
                                      OF PENNSYLVANIA, INC.
                             
                                    IOI MANAGEMENT SERVICES
                                         OF HOUSTON, INC.
                             
                                    IOI MANAGEMENT SERVICES
                                         OF COLORADO, INC.
                             
                                    By: /S/ RONALD E. PIERCE
                                        ---------------------------------
                                        Ronald E. Pierce
                                        President and Chief Executive
                                         Officer

                                       94

<PAGE>
 
                                                                      EXHIBIT 11
                         INTEGRATED ORTHOPAEDICS, INC.
                          SCHEDULE RE: LOSS PER SHARE
        FOR THE THREE AND NINE MONTHS ENDED SEPTEMBER 30, 1998 AND 1997
<TABLE>
<CAPTION>
                                                        THREE MONTHS ENDED        NINE MONTHS ENDED
                                                        ------------------        -----------------
                                                           SEPTEMBER 30             SEPTEMBER 30
                                                        ------------------        -----------------
                                                          1998       1997          1998       1997
                                                          ----       ----          ----       ----
Basic:
<S>                                                    <C>         <C>          <C>         <C> 
Net Loss                                                $  (810)    $ (325)      $(2,654)    $ (774)
Series A Preferred Stock Dividend                           (50)       (50)         (151)      (150)
Series B Preferred Stock Dividend                          (596)         -        (1,729)         -
                                                        -------     ------       -------     ------
Net loss after dividends                                $(1,456)    $ (375)      $(4,534)    $ (924)
                                                        =======     ======       =======     ======
                                                                                          
Weighted average common shares outstanding                6,506      5,292         6,437      5,289
                                                        =======     ======       =======     ======
Loss per share                                          $ (0.22)    $(0.07)      $ (0.70)    $(0.17)
                                                        =======     ======       =======     ======
Diluted:                                                                                  
                                                                                          
Net Loss                                                $  (810)    $ (325)      $(2,654)    $ (774)
Series A Preferred Stock Dividend                           (50)       (50)         (151)      (150)
Series B Preferred Stock Dividend                          (596)         -        (1,729)         -
                                                        -------     ------       -------     ------ 
Net loss after dividends                                $(1,456)    $ (375)      $(4,534)    $ (924)
                                                        =======     ======       =======     ======
                                                                                          
Weighted average common shares outstanding                6,506      5,292         6,437      5,289
Net effect of dilutive stock options and warrants,                                         
   based on treasury stock method using average                                            
   market price                                                                            
                                                        -------     ------       -------     ------ 
                                                          6,506      5,292         6,437      5,289
                                                        =======     ======       =======     ======
Loss per share                                          $ (0.22)    $(0.07)      $ (0.70)    $(0.17)
                                                        =======     ======       =======     ======
 
</TABLE>

<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
       
<S>                             <C>
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             JAN-01-1998
<PERIOD-END>                               SEP-30-1998
<CASH>                                       6,900,000
<SECURITIES>                                         0
<RECEIVABLES>                               10,864,000
<ALLOWANCES>                                 7,466,000
<INVENTORY>                                          0
<CURRENT-ASSETS>                            12,295,000
<PP&E>                                       4,289,000
<DEPRECIATION>                               2,359,000
<TOTAL-ASSETS>                              46,147,000
<CURRENT-LIABILITIES>                        3,207,000
<BONDS>                                      1,457,000
                            3,000
                                          0
<COMMON>                                         7,000
<OTHER-SE>                                  31,396,000
<TOTAL-LIABILITY-AND-EQUITY>                46,147,000
<SALES>                                      9,028,000
<TOTAL-REVENUES>                             9,028,000
<CGS>                                       11,862,000
<TOTAL-COSTS>                               11,862,000
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                             235,000
<INCOME-PRETAX>                            (2,654,000)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                        (2,654,000)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                               (2,654,000)
<EPS-PRIMARY>                                   (0.70)
<EPS-DILUTED>                                   (0.70)
        

</TABLE>


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