Exhibit 10.22


                          REGISTRATION RIGHTS AGREEMENT

           REGISTRATION RIGHTS AGREEMENT, dated as of August 17, 1999, by and
among Concentra Managed Care, Inc., a Delaware corporation (the "COMPANY"), the
several persons named in Schedule I hereto (collectively, the "SCHEDULE I
PURCHASERS") and the several persons named in Schedule II hereto (collectively,
the "FFT PURCHASERS"). The Schedule I Purchasers and the FFT Purchasers are
herein sometimes referred to collectively as the "PURCHASERS."

           WHEREAS, the Company and Yankee Acquisition Corp., a Delaware
corporation ("NEWCO"), have entered into an Amended and Restated Agreement and
Plan of Merger, dated as of March 24, 1999 (the "MERGER AGREEMENT");

           WHEREAS, pursuant to the Merger Agreement, upon the terms and subject
to the conditions set forth therein, (i) Newco will merge with and into the
Company (the "MERGER"), (ii) each outstanding share of common stock, par value
$0.01 per share ("COMPANY COMMON STOCK"), of the Company outstanding immediately
prior to the Merger (other than shares of Company Common Stock owned by Company
or Newco or their Affiliates) will be converted into the right to receive $16.50
per share in cash, without interest, (iii) each outstanding share of common
stock, par value $0.01 per share ("NEWCO COMMON STOCK"), of Newco will be
converted into one share of Company Common Stock and (iv) each outstanding share
of Class A common stock, par value $0.01 per share ("NEWCO CLASS A COMMON
STOCK"), of Newco will be converted into one share of Class A common stock, par
value $0.01 per share ("COMPANY CLASS A COMMON STOCK," and together with Company
Common Stock, the "COMPANY CAPITAL STOCK"), of the Company;

           WHEREAS, Welsh, Carson, Anderson & Stowe VIII, L.P., a Delaware
limited partnership ("WCAS") and the other persons set forth on Schedule I
hereto have entered into a Stock Subscription Agreement, dated as of August 17,
1999 (the "WCAS STOCK SUBSCRIPTION AGREEMENT"), pursuant to which Newco has
agreed to sell to the Schedule I Purchasers an aggregate 23,821,953 shares of
Newco Common Stock;

           WHEREAS, Ferrer Freeman Thompson & Co., LLC, a Delaware limited
liability corporation ("FFT"), on behalf of Health Care Capital Partners L.P.
and as its general partner and on behalf of Health Care Executive Partners L.P.
and as its general partner has entered into a Stock Subscription Agreement,
dated as of March 27, 1999 (the "FFT STOCK SUBSCRIPTION AGREEMENT," and together
with the WCAS Stock Subscription Agreement, the "STOCK SUBSCRIPTION
AGREEMENTS"), pursuant to which Newco has agreed to sell to the FFT Purchasers
an aggregate 1,854,545 shares of Newco Class A Common Stock;




           WHEREAS, upon the consummation of all the transactions contemplated
by the Stock Subscription Agreements and the Merger Agreement, each Stockholder
will own the number of shares of Company Common Stock or Company Class A Common
Stock, as the case may be, appearing opposite the name of such Stockholder on
Schedule I or Schedule II, as the case may be;

           WHEREAS, the Company and each of the Stockholders desire to provide
for certain registration matters relating to their respective holdings of
Company Capital Stock;

           NOW, THEREFORE, in consideration of the premises and of the mutual
covenants and agreements herein contained, the parties hereto hereby agree as
follows:

           1. CERTAIN DEFINITIONS. In addition to the terms defined elsewhere
herein, the following terms shall have the following respective meanings when
used herein with initial capital letters:

           "AFFILIATE" shall have the meaning given to that term in Rule 405
      promulgated under the Securities Act and shall include members of a
      Person's immediate family or trusts for the benefit of members of the
      immediate family of such Person; PROVIDED that officers, directors or
      employees of the Company will not be deemed to be Affiliates of a
      stockholder of the Company for purposes hereof solely by reason of being
      officers, directors or employees of the Company.

           "BOARD" means the Board of Directors of the Company.

           "COMMISSION" shall mean the Securities and Exchange Commission, or
      any other federal agency at the time administering the Securities Act.

           "EXCHANGE ACT" shall mean the Securities Exchange Act of 1934 or any
      similar federal statute, and the rules and regulations of the Commission
      thereunder, all as the same shall be in effect at the time.

           "PUBLIC OFFERING" means the sale of shares of Company Common Stock to
      the public pursuant to an effective registration statement (other than a
      registration statement on Form S-4 or S-8 or any similar or successor
      form) filed under the Securities Act.

           "REGISTRATION EXPENSES" shall mean the expenses so described in
      Section 8 hereof.

           "RESTRICTED STOCK" shall mean any shares of Company Capital Stock,
      the certificates for which are required to bear the legend set forth in
      Section 2 hereof, held by any party to this Agreement.

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           "SECURITIES ACT" shall mean the Securities Act of 1933 or any similar
      federal statute, and the rules and regulations of the Commission
      thereunder, all as the same shall be in effect at the time.

           "SELLING EXPENSES" shall mean the expenses so described in Section 8
      hereof.

           2. RESTRICTIVE LEGEND. Each certificate representing shares of
Company Capital Stock, other than shares of Company Capital Stock transferred in
a public sale or as otherwise permitted by Section 3 hereof, shall be stamped or
otherwise imprinted with a legend substantially in the following form:

          "THE SHARES OF [COMMON STOCK][CLASS A COMMON STOCK] EVIDENCED BY THIS
          CERTIFICATE HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933,
          AND MAY NOT BE SOLD, TRANSFERRED OR OTHERWISE DISPOSED OF UNLESS THEY
          HAVE BEEN REGISTERED UNDER THAT ACT OR AN EXEMPTION FROM REGISTRATION
          IS AVAILABLE."

           3. NOTICE OF PROPOSED TRANSFER. In addition to any restrictions set
forth in the Stockholders Agreement, dated as of the date hereof among the
Company and the Purchasers, prior to any proposed transfer of any Restricted
Stock (other than under the circumstances described in Sections 4, 5 or 6
hereof), the holder thereof shall give written notice to the Company of its
intention to effect such transfer. Each such notice shall describe the manner of
the proposed transfer and, if reasonably requested by the Company, shall be
accompanied by an opinion of counsel reasonably satisfactory to the Company to
the effect that the proposed transfer of the Restricted Stock may be effected
without registration under the Securities Act, whereupon the holder of such
Restricted Stock shall be entitled to transfer such Restricted Stock in
accordance with the terms of its notice; PROVIDED, HOWEVER, that no such opinion
or other documentation shall be required if such notice shall cover a pro rata
distribution (without payment of additional consideration) by any Purchaser that
is a partnership or limited liability company to its partners or members, as the
case may be. Each certificate for Restricted Stock transferred as above provided
shall bear the legend set forth in Section 2, unless (i) such transfer is in
accordance with the provisions of Rule 144 (or any other rule permitting public
sale without registration under the Securities Act or is pursuant to an
effective registration under the Securities Act) or (ii) the opinion of counsel
referred to above is to the further effect that (or, if no opinion is required,
the Company determines that) the transferee and any subsequent transferee (other
than an affiliate of the Company) would be entitled to transfer such securities
in a public sale without registration under the Securities Act.

               The foregoing restrictions on transferability of Restricted Stock
shall terminate as to any particular shares of Restricted Stock when such shares
shall have been effectively registered under the Securities Act and sold or
otherwise disposed of in accordance with the


                                       3


intended method of disposition by the seller or sellers thereof set forth in the
registration statement concerning such shares. Whenever a holder of Restricted
Stock is able to demonstrate to the Company (and its counsel) that the
provisions of Rule 144(k) of the Securities Act are available to such holder
without limitation, such holder of Restricted Stock shall be entitled to receive
from the Company, without expense, a new certificate not bearing the restrictive
legend set forth in Section 2.

           4. REQUIRED REGISTRATION.

           (a) At any time after the Effective Date, the holders of a majority
      of the outstanding Restricted Stock then held by the Schedule I Purchasers
      may request the Company to register under the Securities Act all or any
      portion of the Restricted Stock held by such requesting holder or holders
      for sale in the manner specified in such notice; PROVIDED, HOWEVER, that
      the Schedule I Purchasers may not request registration pursuant to this
      Section 4 more than once every six months.

           (b) Promptly following receipt of any notice under this Section 4,
      the Company shall immediately notify any holders of Restricted Stock from
      whom notice has not been received and shall use its best efforts to
      register as soon as possible under the Securities Act, for public sale in
      accordance with the method of disposition specified in such notice from
      the original requesting holders, the number of shares of Restricted Stock
      specified in such notice (and in any notices received from other holders
      of Restricted Stock within 20 days after their receipt of such notice from
      the Company); PROVIDED, HOWEVER, that if the proposed method of
      disposition specified by the original requesting holders shall be an
      underwritten Public Offering, the number of shares of Restricted Stock to
      be included in such an offering may be reduced (PRO RATA among the
      requesting holders of Restricted Stock based on the number of shares of
      Restricted Stock owned by any such holder on the date of such request out
      of the total outstanding shares of Company Capital Stock on that date) if
      and to the extent that the managing underwriter shall be of the opinion
      that such inclusion would adversely affect the marketing of the Restricted
      Stock to be sold. In the event that the proposed method of disposition
      specified by the original requesting holders shall be an underwritten
      Public Offering, the original requesting holders may choose the managing
      underwriter (which shall be a nationally recognized investment banking
      firm), subject to the consent of the Company (which shall not be
      unreasonably withheld). Notwithstanding anything to the contrary contained
      herein, the obligation of the Company under this Section 4 shall be deemed
      satisfied only when a registration statement covering all shares of
      Restricted Stock specified in notices received as aforesaid (subject to
      any cutbacks as contemplated hereinabove), for sale in accordance with the
      method of disposition specified by the requesting holder, shall have
      become effective and, if such method of disposition is a firm commitment
      underwritten Public Offering, all such shares shall have been sold
      pursuant thereto.



                                       4



           (c) The Company shall be entitled to include in any registration
      statement referred to in this Section 4, for sale in accordance with the
      method of disposition specified by the requesting holders, shares of
      Company Common Stock to be sold by the Company for its own account, except
      as and to the extent that, in the opinion of the managing underwriter (if
      such method of disposition shall be an underwritten Public Offering), such
      inclusion or the inclusion of shares of any other holders would adversely
      affect the marketing of the Restricted Stock to be sold (and in such
      event, such shares to be sold by the Company for its own account or any
      other holders shall be reduced or eliminated before any reduction in the
      number of shares to be sold by requesting holders pursuant to Section
      4(b)). Except as provided in this paragraph (c), the Company will not
      effect any other registration of Company Common Stock, whether for its own
      account or that of other holders, from the date of receipt of a notice
      from requesting holders pursuant to this Section 4 until the completion of
      the period of distribution of the registration contemplated thereby.

           (d) The Company shall not be obligated to file a registration
      statement relating to any registration request under this Section 4:

                 (i) if with respect thereto the managing underwriter, the
           Commission, the Securities Act or the rules and regulations
           thereunder, or the form on which the registration statement is to be
           filed, would require the conduct of an audit other than the regular
           audit conducted by the Company at the end of its fiscal year, in
           which case the filing may be delayed until the completion of such
           audit (and the Company shall, upon request of the parties demanding
           registration pursuant to this Section 4, use its reasonable efforts
           to cause such audit to be completed expeditiously and without
           unreasonable delay); or

                 (ii) if the Company is in possession of material non-public
           information and the Board determines in good faith that disclosure of
           such information would not be in the best interests of the Company
           and its stockholders, in which case the filing of the registration
           statement may be delayed until the earlier of (i) the second business
           day after such conditions shall have ceased to exist and (ii) the
           90th day after receipt by the Company of the written request from the
           holders of a majority of the outstanding Restricted Stock then held
           by the Schedule I Purchasers to register Restricted Stock under this
           Section 4.

           5. PIGGYBACK REGISTRATION. (a) If the Company at any time (other than
pursuant to Section 4 hereof) proposes to register any Company Common Stock
under the Securities Act for sale to the public, whether for its own account or
for the account of other securityholders or both (except with respect to
registration statements on Form S-4 or S-8 or another form not available for
registering the Restricted Stock for sale to the public), it will give written
notice at such time to all holders of outstanding Restricted Stock of its
intention to do so.


                                       5


Upon the written request of any such holder, given within 20 days after receipt
of any such notice by the Company, to register any of its Restricted Stock
(which request shall state the intended method of disposition thereof), the
Company will use its best efforts to cause the Restricted Stock, as to which
registration shall have been so requested, to be included in the securities to
be covered by the registration statement proposed to be filed by the Company,
all to the extent required to permit the sale or other disposition by the holder
(in accordance with its written request) of such Restricted Stock so registered;
PROVIDED that nothing herein shall prevent the Company from abandoning or
delaying such registration at any time; PROVIDED FURTHER that the only
securities the Company shall be required to register pursuant hereto shall be
shares of Company Common Stock. In the event that any registration pursuant to
this Section 5 shall be, in whole or in part, an underwritten Public Offering of
Company Common Stock, any request by a holder pursuant to this Section 5 to
register Restricted Stock shall specify that either (i) such Restricted Stock is
to be included in the underwriting on the same terms and conditions as the
shares of Company Common Stock otherwise being sold through underwriters under
such registration or (ii) such Restricted Stock is to be sold in the open market
without any underwriting, on terms and conditions comparable to those normally
applicable to offerings of common stock in reasonably similar circumstances. The
number of shares of Restricted Stock to be included in such an underwriting may
be reduced (PRO RATA among the holders of Restricted Stock requesting
registration pursuant to this Section 5 based on the number of shares of
Restricted Stock owned by any such holder on the date of such request out of the
total outstanding shares of Company Capital Stock on that date) if and to the
extent that the managing underwriter shall be of the opinion that such inclusion
would adversely affect the marketing of the securities to be sold by the Company
therein; PROVIDED, HOWEVER, that such number of shares of Restricted Stock shall
not be reduced if any shares are to be included in such underwriting for the
account of any person other than the Company and the holders of Restricted
Stock; PROVIDED FURTHER that the number of shares of Restricted Stock held by
the FFT Purchasers that this Section 5 permits to be included in a registration
may be allocated among the FFT Purchasers as such parties shall agree.

           (b) Notwithstanding anything to the contrary contained in Section 4,
5 or 6 hereof, in the event that there is a firm commitment underwritten Public
Offering of securities of the Company pursuant to a registration covering
Restricted Stock and a holder of Restricted Stock does not elect to sell his
Restricted Stock to the underwriters of the Company's securities in connection
with such offering, such holder shall, to the extent required by such
underwriters with respect to all holders of Restricted Stock, refrain from
selling such Restricted Stock during the period of distribution of the Company's
securities by such underwriters and the period in which the underwriting
syndicate participates in the after market; PROVIDED, HOWEVER, that such holder
shall, in any event, be entitled to sell its Restricted Stock commencing on the
120th day after the effective date of such registration statement.

           6. DEMAND REGISTRATION. (a) At any time after the 180th day following
the initial Public Offering, upon the written request of WCAS or FFT (the
Purchaser or Purchasers making such request, a "DEMAND PARTY") requesting that
the Company effect the registration

                                       6



under the Securities Act of all or part of such Demand Party's Restricted Stock
and specifying the amount and intended method of disposition thereof, the
Company will promptly give written notice of such requested registration to the
other holders of outstanding Restricted Stock and thereupon will, as
expeditiously as possible, file a registration statement to effect the
registration under the Securities Act of:

           (i) such shares of Restricted Stock which the Company has been so
      requested to register by the Demand Party; and

           (ii) the other shares of Restricted Stock which the Company has been
      requested to register by written request given to the Company within 20
      days after the giving of such written notice by the Company (which request
      shall specify the amount and intended method of disposition of such
      securities);

all to the extent necessary to permit the disposition (in accordance with the
intended method thereof as aforesaid) of the Restricted Stock so to be
registered; PROVIDED that the Company shall not be required to effect the
registration of Restricted Stock at the request of FFT under this Section 6 on
more than one occasion, except as provided in Section 6(d); and PROVIDED,
FURTHER, that the Company shall not be obligated to file a registration
statement relating to any registration request under this Section 6(a):

           (x) within a period of 180 days (or such lesser period as the
      managing underwriters in an underwritten offering may permit) after the
      effective date of any other registration statement relating to any
      registration request under Sections 4, 5 or 6 hereof;

           (y) if with respect thereto the managing underwriter, the Commission,
      the Securities Act or the rules and regulations thereunder, or the form on
      which the registration statement is to be filed, would require the conduct
      of an audit other than the regular audit conducted by the Company at the
      end of its fiscal year, in which case the filing may be delayed until the
      completion of such audit (and the Company shall, upon request of the
      Demand Parties, use its reasonable efforts to cause such audit to be
      completed expeditiously and without unreasonable delay); or

           (z) if the Company is in possession of material non-public
      information and the Board determines in good faith that disclosure of such
      information would not be in the best interests of the Company and its
      stockholders, in which case the filing of the registration statement may
      be delayed until the earlier of (i) the second business day after such
      conditions shall have ceased to exist and (ii) the 90th day after receipt
      by the Company of the written request from a Demand Party to register
      Restricted Stock under this Section 6(a).

Nothing in this Section 6(a) shall operate to limit the right of a Purchaser to
request the registration of Restricted Stock that consists of Company Common
Stock issuable upon

                                       7


conversion, exercise or exchange of Company Class A Common Stock held by such
Purchaser notwithstanding the fact that at the time of request such Purchaser
holds only Company Class A Common Stock ; PROVIDED that the only securities the
Company shall be required to register pursuant hereto shall be shares of Company
Common Stock. The number of shares of Restricted Stock to be included in such an
underwriting may be reduced (PRO RATA among the holders of Restricted Stock
requesting registration pursuant to this Section 6 based on the number of shares
of Restricted Stock owned by any such holder on the date of such request out of
the total outstanding shares of Company Capital Stock on that date) if and to
the extent that the managing underwriter shall be of the opinion that such
inclusion would adversely affect the marketing of the Restricted Stock to be
sold by the Company therein; PROVIDED, HOWEVER, that such number of shares of
Restricted Stock shall not be reduced if any shares are to be included in such
underwriting for the account of any person other than the Company and the
holders of Restricted Stock; PROVIDED FURTHER that any securities that the
Company proposes to sell for its own account under such registration statement
shall be reduced prior to any reduction of Restricted Stock held by such
Purchaser; PROVIDED FURTHER that the number of shares of Restricted Stock held
by the FFT Purchasers that this Section 6 permits to be included in a
registration may be allocated among the FFT Purchasers as such parties shall
agree. In the event that the number of shares of Restricted Stock requested to
be included in such registration is less than the number which, in the opinion
of the managing underwriter, can be sold, the Company may include in such
registration securities it proposes to sell for its own account up to the number
of securities that, in the opinion of the underwriter, can be sold.

           (b) EFFECTIVE REGISTRATION STATEMENT. A registration requested
pursuant to this Section 6 will not be deemed to have been effected unless it
has become effective; PROVIDED that, if, within 180 days after it has become
effective, the offering of Restricted Stock pursuant to such registration is
interfered with by any stop order, injunction or other order or requirement of
the Commission or other governmental agency or court, then such registration
will be deemed not to have been effected.

           (c) SELECTION OF UNDERWRITERS. If a requested registration pursuant
to this Section 6 involves an underwritten offering and neither the Company nor
any of the Schedule I Purchasers (or Affiliates thereof) are registering any
securities therein, the Demand Parties shall have the right to select the
investment banker or bankers and managers to administer the offering, including
the lead managing underwriter; PROVIDED, HOWEVER, that such investment banker or
bankers and managers shall be reasonably satisfactory to the Company. If a
requested registration pursuant to this Section 6 involves an underwritten
offering and either the Company or any of the Schedule I Purchasers (or their
Affiliates) are registering any securities therein, the Company shall have the
right to select the investment banker or bankers and managers to administer the
offering, including the lead managing underwriter; PROVIDED, HOWEVER, that a
majority in interest of the holders of the Restricted Stock held by all
Purchasers participating in such registration shall have the right to select one
co-manager that is an investment banking firm of nationally recognized standing
to participate in the administration of the offering. Any underwriting agreement
relating to an underwritten public offering shall have representations and

                                       8


warranties by any Purchaser only to the extent relating to the Purchasers
selling Restricted Stock pursuant to such underwritten offering.

           (d) ADDITIONAL REQUESTS. If as a result of the priority provisions
set forth in Section 6(a), (i) the number of shares of Restricted Stock
registered pursuant to this Section 6 is less than 75% of the number of shares
of Restricted Stock set forth in the first request made by FFT under this
Section 6 and (ii) FFT shall have already requested registration under this
Section 6 on one occasion, then FFT shall have the right to make one or more
additional requests for registration under this Section 6 until such time as at
least 75% of the number of shares of Restricted Stock set forth in such first
request under this Section 6 made by FFT have been registered under this Section
6.

           7. REGISTRATION PROCEDURES. If and whenever the Company is required
by the provisions of Sections 4, 5 or 6 hereof to use its best efforts to effect
the registration of any of the Restricted Stock under the Securities Act, the
Company will, as expeditiously as possible:

           (a) in accordance with the Securities Act and all applicable rules
      and regulations, prepare (and afford counsel for the selling holders
      reasonable opportunity to review and comment thereon) and file with the
      Commission a registration statement (which, in the case of an underwritten
      Public Offering pursuant to Section 4 hereof, shall be on Form S-1, S-3 or
      another form of general applicability satisfactory to the managing
      underwriter selected as therein provided) with respect to such securities
      and use its best efforts to cause such registration statement to become
      and remain effective for the period of the distribution contemplated
      thereby (determined as hereinafter provided);

           (b) prepare (and afford counsel for the selling holders reasonable
      opportunity to review and comment thereon) and file with the Commission
      such amendments and supplements to such registration statement and the
      prospectus used in connection therewith and any documents incorporated by
      reference therein and file such other documents as may be necessary to
      keep such registration statement effective for the period specified in
      paragraph (a) above and to comply with the provisions of the Securities
      Act with respect to the disposition of all Restricted Stock covered by
      such registration statement in accordance with the sellers' intended
      method of disposition set forth in such registration statement for such
      period;

           (c) furnish to each seller and to each underwriter such number of
      copies of the registration statement and the prospectus included therein
      (including each preliminary prospectus), and all amendments, supplements,
      and exhibits thereto, and such other documents as such persons may
      reasonably request in order to facilitate the public sale or other
      disposition of the Restricted Stock covered by such registration statement
      (and the Company hereby consents to the use of any such prospectus,
      together with such supplements and amendments, by the sellers and
      underwriters, if any, in connection with the offer and sale covered
      thereby);

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           (d) use its best efforts to register or qualify the Restricted Stock
      covered by such registration statement under the securities or blue sky
      laws of such jurisdictions as the sellers of Restricted Stock or, in the
      case of an underwritten Public Offering, the managing underwriter, shall
      reasonably request (provided that the Company will not be required to (i)
      qualify generally to do business in any jurisdiction where it would not
      otherwise be required to qualify but for this paragraph (d), (ii) subject
      itself to taxation in any such jurisdiction or (iii) consent to general
      service of process in any jurisdiction);

           (e) immediately notify each seller under such registration statement
      and each underwriter, (i) when such registration statement or any
      post-effective amendment or supplement thereto becomes effective or a
      supplement to any prospectus forming a part of such registration statement
      has been filed; (ii) of the issuance by the Commission or any state
      securities authority of any stop order, injunction or other order or
      requirement suspending the effectiveness of such registration statement
      (and the Company shall use best efforts to prevent the initiation of
      proceedings for, prevent the entry of and/or remove such order or
      requirement); (iii) of the happening of any event as a result of which
      such registration statement, as then in effect, the prospectus contained
      therein or any document incorporated by reference therein includes an
      untrue statement of a material fact or omits to state any material fact
      required to be stated therein or necessary to make the statements therein
      not misleading in the light of the circumstances then existing; or (iv) of
      any request by the Commission for the amending or supplementing of such
      registration statement or prospectus or for additional information;

           (f) use its best efforts to furnish, at the request of any seller, on
      the date that Restricted Stock is delivered to the underwriters for sale
      pursuant to such registration, if such securities are being sold through
      underwriters, or on the date that the registration statement becomes
      effective, if such securities are not being sold through underwriters: (i)
      an opinion dated such date of counsel representing the Company for the
      purposes of such registration, addressed to the underwriters, if any, and
      to such seller, stating that such registration statement has become
      effective under the Securities Act and that (A) to the best knowledge of
      such counsel, no stop order suspending the effectiveness thereof has been
      issued and no proceedings for that purpose have been instituted or are
      pending or contemplated under the Securities Act, (B) the registration
      statement, the related prospectus, and each amendment or supplement
      thereof, comply as to form in all material respects with the requirements
      of the Securities Act and the applicable rules and regulations of the
      Commission thereunder (except that such counsel need express no opinion as
      to financial statements, the notes thereto, and the financial schedules
      and other financial and statistical data contained therein) and (C) to
      such other effects as may reasonably be requested by counsel for the
      underwriters or by such seller or its counsel, and (ii) a letter dated
      such date from the independent public accountants retained by the Company,
      addressed to the underwriters, if any, and to such sellers stating that
      they are independent public accountants within the meaning of the
      Securities Act and that, in the opinion of such accountants, the financial
      statements of the Company included in the

                                       10

     registration statement or the prospectus, or any amendment or supplement
     thereof, comply as to form in all material respects with the applicable
     accounting requirements of the Securities Act, and such letter shall
     additionally cover such other financial matters (including information as
     to the period ending no more than five business days prior to the date of
     such letter) with respect to the registration in respect of which such
     letter is being given as such underwriters or sellers may reasonably
     request;

           (g) take such actions as may be necessary or appropriate to obtain a
      CUSIP number (if none exists) for the Company Common Stock, and make all
      filings and secure all approvals required pursuant to the regulations of
      the National Association of Securities Dealers, Inc. in connection with
      such registration;

           (h) take such actions as may be necessary or appropriate to cause the
      Restricted Stock so to be registered to be listed on the principal
      securities exchange (or on the NASDAQ National Market System, as the case
      may be) on which shares of Company Common Stock are then traded (or, in
      the case of an initial Public Offering, on such national securities
      exchange (or on the NASDAQ National Market System) as the Company shall
      elect);

           (i) use its best efforts to comply with all applicable rules and
      regulations of the Commission, and make available to any holder of
      Restricted Stock, as soon as reasonably practicable (but not more than 15
      months) after the effective date of the registration statement, an
      earnings statement which shall satisfy the provisions of Section 11(a) of
      the Securities Act and the rules and regulations promulgated thereunder;
      and

           (j) make available for inspection by each seller, any underwriter
      participating in any distribution pursuant to such registration statement,
      and any attorney, accountant or other agent retained by such seller or
      underwriter, all financial and other records, pertinent corporate
      documents and properties of the Company, and cause the Company's officers,
      directors and employees to supply all information reasonably requested by
      any such seller, underwriter, attorney, accountant or agent in connection
      with such registration statement and permit such seller, attorney,
      accountant or agent to participate in the preparation of such registration
      statement.

For purposes of paragraphs (a) and (b) above and of Section 4(c) hereof, the
period of distribution of Restricted Stock in a firm commitment underwritten
Public Offering shall be deemed to extend until each underwriter has completed
the distribution of all securities purchased by it, and the period of
distribution of Restricted Stock in any other registration shall be deemed to
extend until the earlier of the sale of all Restricted Stock covered thereby or
six months after the effective date thereof.

           In connection with each registration hereunder, the selling holders
of Restricted Stock will furnish to the Company in writing such information with
respect to themselves and

                                       11



the proposed distribution by them as shall be reasonably necessary in order to
assure compliance with federal and applicable state securities laws.

           In connection with each registration pursuant to Sections 4, 5 and 6
hereof covering an underwritten Public Offering, the Company agrees to enter
into a written agreement with the managing underwriter selected in the manner
herein provided in such form and containing such provisions as are customary in
the securities business for such an arrangement between major underwriters and
companies of the Company's size and investment stature; PROVIDED, HOWEVER, that
such agreement shall not contain any such provision applicable to the Company
which is inconsistent with the provisions hereof and PROVIDED, FURTHER, HOWEVER,
that the time and place of the closing under said agreement shall be as mutually
agreed upon among the Company, such managing underwriter and the selling holders
of Restricted Stock.

           8. EXPENSES. All expenses incurred by the Company in complying with
Sections 4, 5 or 6 hereof, including, without limitation, all registration,
listing and filing fees, printing expenses, fees and disbursements of counsel
and independent public accountants for the Company (including with respect to
any special audit or "cold comfort" letters), fees of the National Association
of Securities Dealers, Inc., transfer taxes and fees of transfer agents and
registrars, as well as reasonable fees and out-of pocket expenses of not more
than one counsel for all the Schedule I Purchasers and one counsel for all the
FFT Purchasers, but excluding any Selling Expenses, are herein called
"REGISTRATION EXPENSES." All underwriting discounts and selling commissions
applicable to the sale of Restricted Stock are herein called "SELLING EXPENSES."

           The Company will pay all Registration Expenses in connection with
each registration statement filed pursuant to Sections 4, 5 or 6 hereof. All
Selling Expenses in connection with any registration statement filed pursuant to
Sections 4, 5 or 6 hereof shall be borne by the participating sellers in
proportion to the number of shares sold by each, or by such persons other than
the Company (except to the extent the Company shall be a seller) as they may
agree.

           9. INDEMNIFICATION. In the event of a registration of any of the
Restricted Stock under the Securities Act pursuant to Sections 4, 5 or 6 hereof,
the Company will indemnify and hold harmless, to the fullest extent permitted by
law, each seller of such Restricted Stock thereunder, each underwriter of
Restricted Stock thereunder, each of their respective affiliates, each of their
and their affiliates' respective directors, officers, fiduciaries, trustees,
agents, employees, stockholders, general and limited partners and members, and
each other person, if any, who controls such seller or underwriter within the
meaning of the Securities Act, against any losses, claims, damages or
liabilities, joint or several, actions or proceedings (whether commenced or
threatened) in respect thereof (all of the foregoing, collectively, "CLAIMS")
and expenses (including fees and expenses of counsel, and amounts paid in any
settlement effected with the Company's consent, which consent shall not be
unreasonably withheld or delayed) to which such indemnified party may become
subject under the Securities Act or otherwise, insofar


                                       12


as such Claims or expenses arise out of or are based upon any untrue statement
or alleged untrue statement of any material fact contained in any registration
statement under which such Restricted Stock was registered under the Securities
Act pursuant to Sections 4, 5 or 6, any preliminary prospectus, summary or final
prospectus contained therein, or any amendment or supplement of any thereof, or
any documents incorporated by reference therein, or arise out of or are based
upon the omission or alleged omission to state therein a material fact required
to be stated therein or necessary to make the statements therein not misleading,
and will reimburse each such indemnified party for any legal or other expenses
incurred by them in connection with investigating or defending any such Claim;
PROVIDED, HOWEVER, that the Company will not be liable to any such indemnified
party if and to the extent that any such Claim or expense arises out of or is
based upon an untrue statement or alleged untrue statement or omission or
alleged omission so made in conformity with information pertaining to such
indemnified party furnished by such indemnified party in writing specifically
for use in such registration statement or prospectus.

           In the event of a registration of any of the Restricted Stock under
the Securities Act pursuant to Sections 4, 5 or 6 hereof, each seller of such
Restricted Stock thereunder, severally and not jointly, will indemnify and hold
harmless, to the fullest extent permitted by law, the Company and each person,
if any, who controls the Company within the meaning of the Securities Act, each
officer of the Company who signs the registration statement, each director of
the Company, each underwriter and each person who controls any underwriter
within the meaning of the Securities Act, each other stockholder selling
Restricted Stock under such registration statement and each affiliate, officer,
director, fiduciary, trustee, agent, employee, stockholder, general or limited
partner or member of such selling stockholder against all Claims and expenses
(including fees and expenses of counsel, and amounts paid in any settlement
effected with the indemnifying party's consent, which consent shall not be
unreasonably withheld or delayed) to which the Company or such officer or
director or underwriter or controlling person may become subject under the
Securities Act or otherwise, insofar as such Claims or expenses arise out of or
are based upon any untrue statement or alleged untrue statement of any material
fact contained in the registration statement under which such Restricted Stock
was registered under the Securities Act pursuant to Sections 4, 5 or 6, any
preliminary prospectus, summary or final prospectus contained therein, or any
amendment or supplement of any thereof, or any documents incorporated by
reference therein, or arise out of or are based upon the omission or alleged
omission to state therein a material fact required to be stated therein or
necessary to make the statements therein not misleading, and will reimburse the
Company and each such indemnified party for any legal or other expenses incurred
by them in connection with investigating or defending any such Claim; PROVIDED,
HOWEVER, that such seller will be liable hereunder to any such indemnified party
if and only to the extent that any such Claim or expense arises out of or is
based upon an untrue statement or alleged untrue statement or omission or
alleged omission made in reliance upon and in conformity with information
pertaining to such seller, as such, furnished in writing to the Company by such
seller specifically for use in such registration statement or prospectus;
PROVIDED, FURTHER, HOWEVER, that the liability of each seller


                                       13



hereunder shall be limited to the proceeds (net of underwriting discounts and
commissions) received by such seller from the sale of Restricted Stock covered
by such registration statement.

           Promptly after receipt by an indemnified party hereunder of notice of
the commencement of any action, such indemnified party shall, if a claim in
respect thereof is to be made against the indemnifying party hereunder, notify
the indemnifying party in writing thereof, but the omission so to notify the
indemnifying party shall not relieve it from any liability which it may have to
such indemnified party under this Section 9 except to the extent such
indemnifying party is materially prejudiced thereby, and in any event will not
relieve such indemnifying party from any liability which it may have to any
indemnified party other than under this Section 9. In case any such action shall
be brought against any indemnified party and it shall notify the indemnifying
party of the commencement thereof, the indemnifying party shall be entitled to
participate in and, to the extent it shall wish, to assume and undertake the
defense thereof with counsel satisfactory to such indemnified party, and, after
notice from the indemnifying party to such indemnified party of its election so
to assume and undertake the defense thereof, the indemnifying party shall not be
liable to such indemnified party under this Section 9 for any legal expenses
subsequently incurred by such indemnified party in connection with the defense
thereof other than reasonable costs of investigation and of liaison with counsel
so selected; PROVIDED, HOWEVER, that, if the defendants in any such action
include both the indemnified party and the indemnifying party and the
indemnified party shall have reasonably concluded that there may be reasonable
defenses available to it which are different from or additional to those
available to the indemnifying party, or if the interests of the indemnified
party reasonably may be deemed to conflict with the interests of the
indemnifying party, or if the indemnifying party shall not diligently continue
such defense in good faith, the indemnified party shall have the right to select
a separate counsel and to assume such legal defenses and otherwise to
participate in the defense of such action, with the expenses and fees of such
separate counsel and other expenses related to such participation to be
reimbursed by the indemnifying party as incurred.

           Notwithstanding the foregoing, any indemnified party shall have the
right to retain its own counsel in any such action, but except as set forth
above the fees and disbursements of such counsel shall be at the expense of such
indemnified party unless (i) the indemnifying party shall have failed to retain
counsel for the indemnified person as aforesaid or (ii) the indemnifying party
and such indemnified party shall have mutually agreed to the retention of such
counsel. It is understood that the indemnifying party shall not, in connection
with any action or related actions in the same jurisdiction, be liable for the
fees and disbursements of more than one firm (together with local counsel) to
act as counsel for the indemnified party. The indemnifying party shall not be
liable for any settlement of any proceeding effected without its written consent
(which shall not be unreasonably withheld or delayed), but if settled with such
consent or if there be a final judgment for the plaintiff, the indemnifying
party agrees to indemnify the indemnified party from and against any loss or
liability by reason of such settlement or judgment. No indemnifying party shall,
without the written consent of the indemnified party (which shall not be
unreasonably withheld or delayed), effect the settlement or compromise of, or
consent to the entry of any judgment with respect to, any pending or threatened
action in respect of which indemnification may be sought hereunder (whether or
not the indemnified party is an actual or


                                       14


potential party to such action) unless such settlement, compromise or judgment
(i) includes an unconditional release of such indemnified party from all
liability arising out of such action and (ii) does not include a statement as to
or an admission of fault, culpability or a failure to act by or on behalf of
such indemnified party.

           If for any reason the indemnification provided for in the first two
paragraphs of this Section 9 is unavailable or insufficient to hold harmless an
indemnified party under such paragraphs in respect of any Claims or expenses in
respect thereof referred to therein, then each indemnifying party shall in lieu
of indemnifying such indemnified party contribute to the amount paid or payable
by such indemnified party as a result of such Claims or expenses in such
proportion as appropriate to reflect the relative fault of the Company, on the
one hand, and the underwriters and the sellers of such Restricted Stock, on the
other, in connection with the statements or omissions which resulted in such
Claims or expenses as well as any other relevant equitable considerations,
including the failure to give any notice under the third paragraph of this
Section 9. The relative fault shall be determined by reference to, among other
things, whether the untrue or alleged untrue statement of a material fact
relates to information supplied by the indemnifying party, on the one hand, or
the indemnified party, on the other, and to the parties' relative intent,
knowledge, access to information and opportunity to correct or prevent such
statement or omission. The Company and each of you agree that it would not be
just and equitable if contributions pursuant to this paragraph were determined
by PRO RATA allocation (even if all of the sellers of such Restricted Stock were
treated as one entity for such purpose) or by any other method of allocation
which did not take account of the equitable considerations referred to above in
this paragraph. The amount paid or payable by an indemnified party as a result
of the Claims and expenses in respect thereof, referred to above in this
paragraph, shall be deemed to include any legal or other expenses reasonably
incurred by such indemnified party in connection with investigating or defending
any such action or claim. Notwithstanding the provisions of this paragraph, no
seller of such Restricted Stock or related indemnified party shall be required
to contribute any amount in excess of the amount of proceeds (net of
underwriting discounts and commissions) received by such seller from the sale of
Restricted Stock covered by such registration statement. No person guilty of
fraudulent misrepresentations (within the meaning of Section 11(f) of the
Securities Act), shall be entitled to contribution from any person who is not
guilty of such fraudulent misrepresentation.

           The indemnification of underwriters provided for in this Section 9
shall be on such other terms and conditions as are at the time customary and
reasonably required by such underwriters. In that event the indemnification of
the sellers of Restricted Stock in such underwriting shall at the sellers'
request be modified to conform to such terms and conditions.

           The indemnification and contribution agreements contained herein
shall be in addition to any other rights to indemnification and contribution
which any indemnified party may have pursuant to law or contract or otherwise,
shall remain operative and in full force and effect regardless of any
investigation made or omitted by or on behalf of any indemnified party and shall
survive the transfer of Restricted Stock by any such party.


                                       15


           10 CHANGES IN COMPANY CAPITAL STOCK. If, and as often as, there are
any changes in Company Capital Stock by way of stock split, stock dividend,
combination or reclassification, or through merger, consolidation,
reorganization or recapitalization, or by any other means, appropriate
adjustment shall be made by the Board in the provisions hereof, as may be
required, so that the rights and privileges granted hereby shall continue with
respect to the Company Capital Stock as so changed.

           11 REPRESENTATIONS AND WARRANTIES OF THE COMPANY. The Company
represents and warrants to each of the Purchasers as follows:

           (a) The execution, delivery and performance of this Agreement by the
      Company have been duly authorized by all requisite corporate action and
      will not violate any provision of law, any order of any court or other
      agency of government, the Certificate of Incorporation or By-laws of the
      Company, or any provision of any indenture, agreement or other instrument
      to which it or any of its properties or assets is bound, or conflict with,
      result in a breach of or constitute (with due notice or lapse of time or
      both) a default under any such indenture, agreement or other instrument,
      or result in the creation or imposition of any lien, charge or encumbrance
      of any nature whatsoever upon any of the properties or assets of the
      Company.

           (b) This Agreement has been duly executed and delivered by the
      Company and constitutes the legal, valid and binding obligation of the
      Company, enforceable in accordance with its terms, subject to
      considerations of public policy in the case of the indemnification
      provisions hereof.

           12 RULE 144 REPORTING. The Company agrees with each of the Purchasers
as follows:

           (a) The Company shall make and keep public information available, as
      those terms are understood and defined in Rule 144 under the Securities
      Act, at all times as it is able to do so.

           (b) The Company shall file with the Commission in a timely manner all
      reports and other documents as the Commission may prescribe under Section
      13(a) or 15(d) of the Exchange Act at any time that the Company is subject
      to such reporting requirements of the Exchange Act.

           (c) The Company shall furnish to any holder of Restricted Stock
      forthwith upon request (i) a written statement by the Company as to its
      compliance with the reporting requirements of Rule 144, and of the
      Securities Act and the Exchange Act, (ii) a copy of the most recent annual
      or quarterly report of the Company, and (iii) such other reports and
      documents so filed as a holder may reasonably request to avail itself of
      any

                                       16


      rule or regulation of the Commission allowing a holder of Restricted
      Stock to sell any such securities without registration.

           13 MISCELLANEOUS.

           (a) All covenants and agreements contained in this Agreement by or on
      behalf of any of the parties hereto shall bind and inure to the benefit of
      the respective successors and permitted assigns of the parties hereto
      whether so expressed or not. Without limiting the generality of the
      foregoing: (i) any holder of Restricted Stock may assign rights hereunder
      with respect to any of its Restricted Stock to any transferee of such
      Restricted Stock, provided that such transferee agrees in writing to
      become a party hereto and to be bound as a holder of Restricted Stock
      hereby.

           (b) Any notice or other communications required or permitted
      hereunder shall be deemed to be sufficient and received if contained in a
      written instrument delivered in person or by courier or duly sent by first
      class certified mail, postage prepaid, or by facsimile addressed to such
      party at the address or facsimile number set forth below:

               (1)  if to the Company, to it at:

                      5080 Spectrum Drive
                      Suite 400, West Tower
                      Addison, Texas 75001
                      Telecopy Number: (972) 387-1938
                      Attention:  General Counsel

               with a copy to:

                      Reboul, MacMurray, Hewitt, Maynard & Kristol
                      45 Rockefeller Plaza
                      New York, New York 10111
                      Telecopy Number:  (212) 841-5725
                      Attention: Othon A. Prounis

               (2) if to any Stockholder, to the address of such Stockholder
      appearing in Schedule I or Schedule II hereto;

      or, in any case, at such other address or facsimile number as shall have
      been furnished in writing by such party to the other parties hereto. In
      the case of any notices, requests, claims, demands or other
      communications to more than one FFT Purchaser and or their Permitted
      Transferee, delivery thereof in accordance with the foregoing provisions
      of this Section XII(5) to FFT shall be deemed to be delivery to all such
      FFT Purchasers and their Permitted Transferees. All such notices,
      requests, consents and other communications

                                       17


      shall be deemed to have been received (a) in the case of personal or
      courier delivery, on the date of such delivery, (b) in the case of
      mailing, on the fifth business day following the date of such mailing
      and (c) in the case of facsimile, when received.

           (c) THIS AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE
      WITH THE LAWS OF THE STATE OF NEW YORK.

           (d) This Agreement constitutes the entire agreement of the parties
      with respect to the subject matter hereof and may not be modified or
      amended except by an instrument in writing signed by, and the Company will
      not grant any registration rights, with respect to the equity securities
      of the Company, to any other person without the consent of, the Company
      and (i) the holders of a majority in interest of the Restricted Stock held
      by the Schedule I Purchasers, (ii) the holders of a majority in interest
      of the Restricted Stock held by the FFT Purchasers and (iii) if adversely
      affected thereby, each of the holders of Restricted Stock so adversely
      affected. Any waiver of any provision of this Agreement must be in a
      writing signed by the party against whom enforcement of such waiver is
      sought.

           (e) This Agreement shall be of no force or effect unless and until
      the consummation of the Merger (the "EFFECTIVE DATE"); upon such
      consummation, this Agreement shall be in full force and effect.

           (f) This Agreement may be executed in two or more counterparts, each
      of which shall be deemed an original, but all of which together shall
      constitute one and the same instrument.

           (g) Headings and section reference numbers in this Agreement are for
      reference purposes only and shall not in any way affect the meaning or
      interpretation of this Agreement.

           (h) In the event that any one or more of the provisions set forth
      herein shall, for any reason, be held to be invalid, illegal or
      unenforceable in any respect, such invalidity, illegality or
      unenforceability shall not affect any other provision of this Agreement.

           (i) Except as specifically set forth in Section 9 hereof, this
      Agreement is not intended to confer any rights or remedies upon any person
      other than the parties hereto.

           (j) Each party hereto agrees that a remedy at law for any breach or
      threatened breach by such party of this Agreement would be inadequate and
      therefore agrees that any other party hereto shall be entitled to specific
      performance of this Agreement in addition to any other available rights
      and remedies in case of any such breach or threatened breach.


                                       18


           (k) Any party hereto may withdraw as a party to this Agreement
      following an initial Public Offering by the Company by giving written
      notice thereof to the Company.

           (l) EACH OF THE PARTIES HERETO HEREBY IRREVOCABLY WAIVES ANY AND ALL
      RIGHT TO TRIAL BY JURY IN ANY LEGAL PROCEEDING ARISING OUT OF OR RELATED
      TO THIS AGREEMENT OR THE TRANSACTIONS CONTEMPLATED HEREBY.


                                       19


               IN WITNESS WHEREOF, each of the parties hereto has executed this
Agreement as a sealed instrument, all as of the day and year first above
written.

                           CONCENTRA MANAGED CARE, INC.


                           By:/s/ Richard Parr II
                              ------------------------------------
                                  Name:  Richard Parr II
                                  Title: Executive Vice President and
                                          General Counsel


                           WELSH, CARSON, ANDERSON & STOWE VIII, L.P.
                           By:    WCAS VIII Associates, L.L.C., General Partner


                           By:/s/ Jonathan M. Rather
                              -----------------------------------
                                   Managing Member


                           WCAS HEALTHCARE PARTNERS, L.P.
                           By:  WCAS HC Partners, General Partner


                           By:/s/ Jonathan M. Rather
                              -----------------------------------
                                  General Partner







                         WCAS CAPITAL PARTNERS III, L.P.
                             By: WCAS CP III Associates, L.L.C., General Partner


                             By:/s/ Jonathan M. Rather
                                ---------------------------------
                                    Managing Member





                             Patrick J. Welsh
                             Russell L. Carson
                             Bruce K. Anderson
                             Andrew M. Paul
                             Thomas E. McInerney
                             Robert A. Minicucci
                             Anthony J. deNicola
                             Paul B. Queally
                             Lawrence B. Sorrel
                             Rudolph E. Rupert
                             D. Scott Mackesy
                             Priscilla A. Newman
                             Laura M. VanBuren
                             Sean M. Traynor
                             John Almedia, Jr.
                             Jonathan M. Rather

                             By:/s/ Jonathan M. Rather
                                -------------------------------------
                                    Jonathan M. Rather, Individually and
                                    as Attorney-in-Fact




                             /s/ Daniel J. Thomas
                             -------------------------------
                             Daniel J. Thomas


                             /s/ James M. Greenwood
                             -------------------------------
                             James M. Greenwood


                             /s/ Richard A. Parr II
                             -------------------------------
                             Richard A. Parr II


                             /s/ W. Tom Fogarty, M.D.
                             -------------------------------
                             W. Tom Fogarty, M.D.


                             /s/ John Hamilton
                             -------------------------------
                             John Hamilton


                             /s/ Scott Henault
                             -------------------------------
                             Scott Henault


                             /s/ Kenneth Loffredo
                             -------------------------------
                             Kenneth Loffredo


                             /s/ Darla Walls
                             -------------------------------
                             Darla Walls


                             /s/ Thomas Cox
                             -------------------------------
                             Thomas Cox


                             /s/ Keith Newton
                             -------------------------------
                             Keith Newton


                             /s/ Gene Whobrey
                             -------------------------------
                             Gene Whobrey






                             /s/ Steve Nelson
                             -------------------------------
                             Steve Nelson


                             /s/ Jack Sherrer, M.D.
                             -------------------------------
                             Jack Sherrer, M.D.


                             /s/ Arthur Canario, M.D.
                             -------------------------------
                             Arthur Canario, M.D.





                             /s/ Craig R. Callen
                             -------------------------------
                             Craig R. Callen


                             /s/ James D. Hann
                             -------------------------------
                             James D. Hann


                             /s/ David L. Dennis
                             -------------------------------
                             David L. Dennis


                             /s/ Lawrence M. Lavine
                             -------------------------------
                             Lawrence M. Lavine


                             /s/ Kathleen F. Lamb
                             -------------------------------
                             Kathleen F. Lamb


                             /s/ William G. Payne
                             -------------------------------
                             William G. Payne


                             /s/ Michael R. Nicolais
                             -------------------------------
                             Michael R. Nicolais


                             /s/ Patrick W. McMullan
                             -------------------------------
                             Patrick W. McMullan


                             /s/ Douglas M. Ladden
                             -------------------------------
                             Douglas M. Ladden


                             /s/ Richard A. Landgarten
                             -------------------------------
                             Richard A. Landgarten


                             /s/ Vincent DeGiamo
                             -------------------------------
                             Vincent DeGiamo





                       JP MORGAN DIRECT CORPORATE FINANCE
                       INSTITUTIONAL INVESTORS, LLC


                       By:    /s/ Julian E. Shles
                       -------------------------------
                        Name: Julian E. Shles
                        Title: Vice President of J.P. Morgan Investment
                               Management, Inc., as Investment Advisor

                       JP MORGAN DIRECT CORPORATE FINANCE PRIVATE
                       INVESTORS, LLC


                       By:    /s/ Julian E. Shles
                       -------------------------------
                        Name: Julian E. Shles
                        Title: Vice President of J.P. Morgan Investment
                                Management, Inc., as Investment Advisor





                       CALIFORNIA PUBLIC EMPLOYEES' RETIREMENT SYSTEM


                       By: /s/ David E.J. Maxwell
                          -------------------------------
                            Name:  David E. J. Maxwell
                            Title: Principal Investment Officer





                       CALIFORNIA STATE TEACHERS' RETIREMENT SYSTEM


                       By: /s/ Eileen Y. Okada
                          -----------------------------------
                               Name:  Eileen Y. Okada
                               Title: Director of Investment Administration
                                       and External Relations





                             CHASE EQUITY ASSOCIATES, L.P.
                             By:  Chase Capital Partners,
                                            its General Partner


                             By:/s/ Jonas Steinman
                                ----------------------------
                             Name: Jonas Steinman
                             Title:





                CMS CO-INVESTMENT SUBPARTNERSHIP II

                By:    CMS CO-INVESTMENT SUBPARTNERSHIP, a Delaware general
                       partnership
                By:    CMS Co-Investment Partners, L.P., a Delaware limited
                       partnership
                By:    CMS/Co-Investment Associates, L.P., a Delaware limited
                       partnership
                By:    MSPS/Co-Investment, Inc.,
                               a Delaware corporation

                By:/s/ Richard Mitchell
                   ----------------------------
                Its: Vice President

                By:    CMS 1997 Investment Partners, L.P., a Delaware limited
                       partnership
                By:    CMS 1997, Inc.
                               a Delaware corporation

                By:/s/ Richard Mitchell
                   ----------------------------
                Its: Vice President

                By:    CMS Co-Investment Partners I-Q, L.P., a Delaware limited
                       partnership
                By:    CMS/Co-Investment Associates, L.P., a Delaware limited
                       partnership
                By:    MSPS/Co-Investment, Inc.,
                               a Delaware corporation

                By:/s/ Richard Mitchell
                   ----------------------------
                Its: Vice President

                By:    CMS 1997 Investment Partners, L.P., a Delaware limited
                       partnership
                By:    CMS 1997, Inc.
                               a Delaware corporation

                By:/s/ Richard Mitchell
                   ----------------------------
                Its: Vice President


                By:/s/ Ira Brind
                   -------------------
                       Ira Brind




               By:/s/ Bruce Lindsay
                  --------------------
                      Bruce Lindsay


               CMS DIVERSIFIED PARTNERS, L.P.
               By: CMS/DP Associates, L.P, a general partner
               By: MSPS/DP, Inc., its general partner

                       By:/s/ Richard Mitchell
                         ----------------------------
                                Vice President

               By: CMS 1995 Investment Partners, L.P, a general partner
               By: CMS 1995, Inc., its general partner

                      By:/s/ Richard Mitchell
                         ----------------------------
                               Vice President




                                 BT CAPITAL INVESTORS, L.P.


                                 By: /s/ Heidi Silverstein
                                    ---------------------------------
                                    Name:  Heidi Silverstein
                                    Title: Director





                     FINANCIERE ET INDUSTRIELLE GAZ ET EAUX


                             By: /s/ Bertrand Soleil
                                ---------------------
                              Name: Bertrand Soleil
                                    Title:





                             GS PRIVATE EQUITY PARTNERS II, L.P.

                             By:    GS PEP II Advisors, L.L.C.,
                                        its General Partner

                             By:    GSAM Gen-Par, L.L.C.,
                                        its Managing Member


                             By:/s/ Jerome Truzzolino
                                -------------------------------
                                   Name: Jerome Truzzolino
                                   Title: Vice President


                             GS PRIVATE EQUITY PARTNERS II OFFSHORE, L.P.

                             By:    GS PEP II Offshore Advisors, Inc.,
                                    its General Partner


                             By:/s/ Jerome Truzzolino
                                -------------------------------
                                   Name: Jerome Truzzolino
                                   Title: Vice President


                             GS PRIVATE EQUITY PARTNERS II - DIRECT INVESTMENT
                             FUND, L.P.

                             By:   GS PEP II Direct Investment Advisors, L.L.C.,
                                   its General Partner

                             By:   GSAM Gen-Par, L.L.C.,
                                   its Managing Member


                             By:/s/ Jerome Truzzolino
                                -------------------------------
                                    Name: Jerome Truzzolino
                                    Title: Vice President







                             GS PRIVATE EQUITY PARTNERS III, L.P.

                             By:    GS PEP III Advisors, L.L.C., its General
                                    Partner

                             By:    GSAM Gen-Par, L.L.C.,
                                    its Managing Partner


                             By:/s/ Jerome Truzzolino
                                -------------------------------
                                    Name: Jerome Truzzolino
                                    Title: Vice President


                             GS PRIVATE EQUITY PARTNERS III OFFSHORE, L.P.

                             By:    GS PEP III Offshore Advisors, Inc., its
                                    General Partner


                             By:/s/ Jerome Truzzolino
                                -------------------------------
                                    Name: Jerome Truzzolino
                                    Title: Vice President


                             NBK/GS PRIVATE EQUITY PARTNERS, L.P.

                             By:    GS PEP Offshore Advisors (NBK), Inc.
                                    General Partner

                             By:/s/ Jerome Truzzolino
                                -------------------------------
                                    Name: Jerome Truzzolino
                                    Title: Vice President




                             HAMILTON LANE PRIVATE EQUITY PARTNERS, L.P.

                             By:    HLSP Investment Management, LLC


                                            By:/s/ Mario L. Giannini
                                               -----------------------
                                                   Mario L. Giannini
                                                   Managing Member


                             HAMILTON LANE PRIVATE EQUITY FUND, PLC

                             By:    HLSP Investment Management, LLC


                                            By:/s/ Mario L. Giannini
                                               -----------------------
                                               Mario L. Giannini
                                               Managing Member




                             A.S.F. CO-INVESTMENT PARTNERS, L.P.


                             By: /s/ Jonathan F. Murphy
                                 ------------------------
                             Name: Jonathan F. Murphy
                                    Title: Managing Member of Old Kings I, LLC,
                                           the Sole Member of PAF 10/98, LLC,
                                           the Sole General Partner of A.S.F.
                                           Co-Investment Partners, L.P.





368618.4

                             NASSAU CAPITAL PARTNERS III L.P.
                             By:        Nassau Capital L.L.C.,
                                        its General Partner


                             By:/s/ John G. Quigley
                                -------------------------
                                    Name: John G. Quigley
                                    Title:   Member


                             NAS PARTNERS LLC


                             By: /s/ John G. Quigley
                                -------------------------
                                     Name: John G. Quigley
                                     Title:   Member






                             NEW YORK LIFE INSURANCE COMPANY


                             By:/s/ Steven M. Benevento
                                -------------------------
                                    Name: Steven M. Benevento
                                    Title:   Director






                             FERRER FREEMAN THOMPSON & CO.

                             on behalf of HEALTH CARE CAPITAL
                             PARTNERS L.P. and as its General Partner

                                    and

                             on behalf of HEALTH CARE EXECUTIVE
                             PARTNERS L.P. and as its General Partner


                             By:/s/ CARLOS A. FERRER
                                -------------------------
                                Name:  Carlos A. Ferrer
                                Title: Member, Ferrer Freeman Thompson & Co.
                                       General Partner





                                                                  SCHEDULE I
                                                                 (continued)

                                                                  SCHEDULE I

                              SCHEDULE I PURCHASERS



    NAME AND ADDRESS OF PURCHASER
    -----------------------------
Welsh, Carson, Anderson & Stowe VIII, L.P.
WCAS Healthcare Partners, L.P.
Patrick J. Welsh
Russell L. Carson
Bruce K. Anderson
Andrew M. Paul
Thomas E. McInerney
Robert A. Minicucci
Anthony J. deNicola
Paul B. Queally
Lawrence B. Sorrel
Rudolph E. Rupert
D. Scott Mackesy
Priscilla A. Newman
Laura M. VanBuren
Sean Traynor
John Almedia
Jonathan M. Rather
Daniel J. Thomas
James M. Greenwood
Richard A. Parr II
W. Tom Fogarty, M.D.
John Hamilton
Scott Henault
Kenneth Loffredo
Darla Walls
Thomas Cox
Keith Newton



                                                                  SCHEDULE I
                                                                 (continued)

    NAME AND ADDRESS OF PURCHASER
    -----------------------------
Gene Whobrey
Steve Nelson
Jack Sherrer, M.D.
Arthur Canario, M.D.
Craig R. Callen
James D. Hann
David L. Dennis
Lawrence M. Lavine
Kathleen F. Lamb
William G. Payne
Michael R. Nicolais
Patrick W. McMullan
Douglas M. Ladden
Richard A. Landgarten
Vincent DeGiaimo
JP Morgan Direct Corporate Finance
Institutional Investors, LLC
JP Morgan Direct Corporate Finance Private Investors, LLC
California Public Employees' Retirement System
California State Teachers' Retirement System
Chase Equity Associates, L.P.
CMS Co-Investment Subpartnership II
CMS Diversified Partners, L.P.
BT Capital Investors, L.P.
Financiere et Industrielle Gaz et Eaux
GS Private Equity Partners II, L.P.
GS Private Equity Partners II Offshore, L.P.
GS Private Equity Partners II
   Direct Investment Fund, L.P.
GS Private Equity Partners III, L.P.
GS Private Equity Partners III Offshore, L.P.
NBK/GS Private Equity Partners, L.P.
Hamilton Lane Private Equity Partners, L.P.
Hamilton Lane Private Equity Fund, PLC



                                                                  SCHEDULE I
                                                                 (continued)

    NAME AND ADDRESS OF PURCHASER
    -----------------------------
A.S.F. Co-Investment Partners, L.P.
Nassau Capital Partners III L.P.
NAS Partners LLC
New York Life Insurance Company

c/o  Welsh, Carson, Anderson & Stowe
     320 Park Avenue, Suite 2500
     New York, New York 10022
     Attention: Paul B. Queally
     Telecopy: (212) 893-9566






                                                                    SCHEDULE II

                                 FFT PURCHASERS


NAME AND ADDRESS OF PURCHASER
- -----------------------------

Health Care Capital Partners L.P.

Health Care Executive Partners L.P.


c/o  Ferrer Freeman Thompson & Co.
     The Mill
     10 Glenville Street
     Greenwich, Connecticut  06831
     Attention:  Carlos Ferrer
     Telecopy:  (203) 532-8016

     with a copy to:

     Fried, Frank, Harris, Shriver & Jacobson
     One New York Plaza
     New York, New York 10004
     Attention:  David Golay
     Telecopy:  (212) 859-8164