Document:

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                                                                   EXHIBIT 10.24

                               AMENDMENT NO. 1 TO
                                LETTER AGREEMENT

     THIS AMENDMENT NO. 1 TO LETTER AGREEMENT ("Amendment") is made as of July
26, 2001, by and between ZIMMER, INC., a Delaware corporation (the "Parent
Borrower") and BANK OF AMERICA, N.A., a national banking association (the
"Bank").

                                    RECITALS

     A. The Parent Borrower and the Bank are parties to that certain Letter
Agreement dated as of July 17, 2001 (the "Letter Agreement"), pursuant to which
the Bank has made a $26,000,000 uncommitted standard instrument credit facility
available to the Parent Borrower and certain designated subsidiaries of the
Parent Borrower.

     B. The Parent Borrower has requested certain changes in the terms of the
Letter Agreement, and the Bank is willing to agree to those changes on the terms
and conditions set forth herein.

                                    AGREEMENT

     NOW, THEREFORE, in consideration of the premises and for other good and
valuable consideration, the parties do hereby agree as follows:

     1. Capitalized terms used but not defined in this Amendment shall have the
meanings given them in the Letter Agreement.

     2. The third sentence of Section I.C(1) of the Letter Agreement is hereby
amended and restated in its entirety to read as follows:

          "The Bank may, in its sole discretion (a) upon notice to Zimmer,
     change the pricing offered under this Agreement at any time, and (b) with
     respect to Standard Instruments that are requested by Borrowers domiciled
     in jurisdictions where the then current pricing is (in the opinion of the
     Bank) not available, or is otherwise not practicable, offer alternative
     pricing that it deems appropriate for the relevant jurisdiction."

     3. The Parent Borrower hereby represents and warrants to the Bank that:

     (a) this Amendment has been duly authorized, executed and delivered on its
behalf, and the Letter Agreement, as amended hereby, constitutes its legal,
valid and binding obligation enforceable against it in accordance with its
terms, except as limited by: (i) the Bankruptcy Code of the United States of
America and all other applicable liquidation, conservatorship, bankruptcy,
moratorium, rearrangement, receivership, insolvency, reorganization, suspension
of payments, or

<PAGE>

similar debtor relief laws from time to time in effect affecting the rights of
creditors generally; and (ii) general principles of equity;

     (b) the representations and warranties of Parent Borrower set forth in
SECTION III of the Letter Agreement (other than any representations and
warranties that relate exclusively to a prior date, which representations and
warranties were true and correct in all material respects as of such prior
date), are true and correct in all material respects on and as of the date
hereof with the same force and effect as if made on and as of such date; and

     (c) no Default or Event of Default under the Letter Agreement has occurred
and is continuing or will result from the execution and delivery of this
Amendment.

     4. This Amendment shall be governed by and construed in accordance with the
laws of the State of New York. As expressly amended hereby, the Letter Agreement
is hereby ratified and confirmed and shall continue in full force and effect.

     IN WITNESS WHEREOF, the parties have caused this Amendment to be executed
by their duly authorized officers as of the date first written above.

                                        ZIMMER, INC.

                                        By:
                                           ------------------------------------
                                        Title:
                                              ---------------------------------

                                        BANK OF AMERICA, N.A.

                                        By:
                                           -------------------------------------
                                        Title:
                                              ----------------------------------

                                       2<PAGE>
                                                                   EXHIBIT 10.25

                          UNCOMMITTED CREDIT AGREEMENT

     This UNCOMMITTED CREDIT AGREEMENT (the "Agreement") is entered into as of
October 29, 2001 between Zimmer, Inc., a Delaware corporation having its
principal office at 345 East Main Street, Warsaw, Indiana 46581 (the
"Borrower"), and Sumitomo Mitsui Banking Corporation (the "Lender").

     RECITALS:

     WHEREAS, the Borrower from time to time may apply to the Lender for loans
to be made pursuant to the terms and conditions hereinafter set forth; and

     WHEREAS, the parties hereto desire to set forth the terms and conditions
pursuant to which such loans may be made by the Lender and other rights and
obligations relating thereto;

     NOW, THEREFORE, the parties hereto agree as follows:

                              SECTION 1. THE LOANS

     1.1 The Lender may, in its sole discretion, from time to time from the date
hereof until April 30, 2002, make loans to the Borrower (each a "Loan" and
collectively the "Loans") which shall be in such amounts and upon such other
terms and conditions as may be agreed by the Lender and the Borrower; provided,
that the aggregate principal amount of Loans outstanding under this Agreement at
any time shall not exceed $10,000,000.00 and no Loan shall have a maturity date
beyond July 31, 2002. The Borrower may request a Loan from the Lender by
telephone, and the Borrower and the Lender may agree to the interest terms and
duration of each Loan by telephone. It is understood that if the funding basis
for a Loan is to be based on the Lender's rates in the London interbank market,
three Business Days' advance notice will be required. It is understood, further,
that the Lender, in its sole discretion may make or decline to make any
requested Loan. As to each Loan as to which agreement is reached, the Borrower
will set forth the agreed terms and conditions in a confirmation (a
"Confirmation") substantially in the form of Exhibit A hereto, and the Lender
shall acknowledge and accept the terms and conditions as therein set forth or
shall promptly inform the Borrower of its objection to any term or condition set
forth in such Confirmation and the reason for its objection.

     1.2 All Loans made under this Agreement shall be evidenced by a single
Promissory Note (the "Note"), including the schedule (the "Schedule") attached
thereto, substantially in the form of Exhibit B hereto, and shall be repayable
on such date or dates, shall bear interest at such rate or rates and shall have
such interest payment date or dates as may be agreed by the Lender and the
Borrower from time to time. When and if the Borrower and the Lender have agreed
to the terms and conditions for a new Loan, the Lender shall endorse the
Schedule to reflect the terms and conditions of the new Loan as set forth in the
relevant Confirmation. All Loans and all payments of principal and interest
shall be recorded on the records of the Lender, and, prior to any permitted
transfer of, or any action to collect, any Loan or the Note, the then
outstanding principal amount and interest rate for each outstanding Loan shall
be endorsed on the reverse of the Note or any

<PAGE>

continuation thereof, together with the date of such endorsement. Any such
endorsement shall constitute prima facie evidence of the information so
endorsed.

     1.3 Each Loan may be prepaid by the Borrower, in whole or in part, at any
time prior to the maturity date thereof without premium or penalty, subject to
payment of Breakage Costs pursuant to Section 1.5. All payments by the Borrower
shall be made without set-off, deduction or counterclaim by wire transfer of
immediately available funds to Citibank, N.A. NY ABA 0210-0008-9, in favor of
Sumitomo Mitsui Banking Corporation NY, Account Number 36023837, (reference
Zimmer, Inc.), or such other account in New York City as the Lender may notify
the Borrower, at or prior to 2:00 P.M., New York City time, on the date of
payment.

     1.4 In the event that any change in, or interpretation of, any law or
regulation (including, without limitation, relating to taxes (other than income
taxes), deposit reserves or capital requirements) results in an increase in the
Lender's cost of making, funding or continuing any Loan hereunder, the Borrower
shall compensate the Lender for such actual increase in cost upon written demand
detailing the increased cost; provided, that the Lender shall use all reasonable
efforts consistent with its normal procedures to eliminate or reduce such
increased cost.

     1.5 If any payment of principal of any Loan is made other than on the
maturity date for such Loan as a result of a prepayment pursuant to Section 1.3
hereof, acceleration of the payment of such Loan pursuant to Section 4.2 hereof
or otherwise, or if the Borrower shall fail to borrow a Loan which it has
requested and which the Bank as agreed to make, the Borrower shall upon demand,
pay to the Lender any Breakage Costs incurred by the Bank as a result thereof.
"Breakage Costs" means any losses or expenses incurred by the Lender arising out
of the liquidation or redeployment of deposits, including, without limitation,
losses related to interest rate changes and losses arising out of the early
termination of any swap or similar arrangements, as described in a certification
of the Lender which shall set forth the reasons for and calculation of such
losses and expenses; provided, that the Lender shall use all reasonable efforts
consistent with its normal procedures to eliminate or reduce such losses and
expenses. On the request of the Borrower, the Lender will furnish a statement
describing the calculation of any such costs, which statement shall be
determinative of the amount thereof, absent manifest error.

     1.6 When any payment hereto or under the Note shall be stated to be due on
a day other than a Business Day, such payment shall be made on the next
succeeding Business Day, and such extension of time shall be included in the
computation of interest or other amounts payable.

     1.7 Loans made to the Borrower by the Lender shall be transferred by bank
wire, in same day immediately available funds, to such bank account as the
Borrower may instruct the Lender from time to time. All payments of principal,
interest and other amounts shall be made by the Borrower to the Lender by bank
wire, in same day immediately available funds, to such bank account as the
Lender may instruct the Borrower from time to time.

     1.8 From time to time, the Borrower will give the Lender written evidence
of the persons ("Authorized Persons") authorized to act on behalf of the
Borrower under this Agreement, which evidence of authorization shall be in the
form satisfactory to the Lender. The Lender may rely on the authority of any
person that it, in good faith, believes to be an Authorized Person and on an
oral (including telephone) or written instructions from any such Authorized
Person.

                                       2
<PAGE>

     1.9 For purposes of this Agreement and the Note, the term "Business Day"
shall mean a day on which Banks are not required or authorized to close in New
York, New York, and when any Loan is to bear interest based on rates in the
London interbank market, shall also be a day on which the Lender conducts
banking business in London, England.

              SECTION 2. REPRESENTATIONS AND WARRANTIES OF BORROWER

     The Borrower hereby represents and warrants to, and agrees with, the Lender
that: (a) the Borrower is a corporation duly organized and validly existing
under the laws of the State of Delaware with the corporate power to carry on its
business as it is now being conducted; (b) the execution and delivery of this
Agreement and the Note by the Borrower, and borrowings by the Borrower under
this Agreement, have been duly authorized by the Borrower, and this Agreement
and the Note will constitute valid and legally binding obligations of the
Borrower, enforceable against the Borrower in accordance with their respective
terms; (c) neither the execution and delivery of this Agreement or the Note, nor
borrowings by the Borrower under this Agreement, will conflict with, constitute
a default under or result in a violation of the Borrower's Certificate of
Incorporation, its Bylaws or any agreement, instrument, judgment, decree,
statute, material rule or regulation to which the Borrower is subject; (d) the
unaudited consolidated balance sheet of the Borrower and its consolidated
subsidiaries as at December 31, 2000 and the related financial statements and
the unaudited consolidated balance sheet and financial statements for the fiscal
period ended on June 30, 2001 fairly present (subject, in the case of the
quarterly statements to year-end adjustment) the financial condition of the
Borrower and its consolidated subsidiaries for the periods covered by such
statements in accordance with generally accepted accounting principles
consistently applied and since the date of the last such statement there has
been no material adverse change in the financial condition of the Borrower; and
(e) the application of the proceeds of any Loans hereunder will not violate
Regulation U of the Board of Governors of the Federal Reserve System.

                              SECTION 3. COVENANTS

     3.1 The Borrower agrees to deliver to the Lender its quarterly financial
statements within 90 days of the end of the pertinent quarterly period, which
quarterly financials may be unaudited but shall be prepared in accordance with
generally accepted accounting principles consistent with those used in the
preparation of the statements described in Section 2(d) above.

     3.2 The Borrower will not consolidate or merge, into or with any other
entity, or dissolve or liquidate or sell all or a substantial part of its
assets.

                          SECTION 4. EVENTS OF DEFAULT

     4.1 Each of the following shall constitute an event of default (an "Event
of Default") under this Agreement and the Note:

          (a) The Borrower shall fail to pay the principal amount of any Loan on
the due date thereof, or shall fail to make any payment of interest on any Loan
within three Business Days after the due date thereof;

          (b) Any representation or warranty by the Borrower to the Lender in
this Agreement or any application, financial statement or other writing
delivered to the Lender shall prove to have been untrue in any material respect
when made;

                                       3

<PAGE>

          (c) The Borrower shall default in the due observance or performance of
any other term, covenant or agreement contained in this Agreement, and such
default shall continue unremedied for a period of fifteen Business Days after an
Authorized Person becomes aware of such default;

          (d) The Borrower shall cease to pay its debts generally as they become
due or shall make an assignment for the benefit of creditors, or any proceeding
relating to the Borrower under any bankruptcy, reorganization, arrangement or
readjustment of debt, dissolution or liquidation law of any jurisdiction shall
be commenced by the Borrower, or such a proceeding shall be commenced against
the Borrower and shall remain undismissed for a period of 30 days;

          (e) The Borrower shall fail to perform or observe the terms of, or
there shall be any "Default" or "Event of Default" as described in the Credit
Agreement dated as of July 31, 2001 among the Borrower, the Banks named therein
and The Chase Manhattan Bank as Administrative Agent, as amended through the
date hereof (as so amended, the "Chase Credit Agreement") and as a result of
such failure the holders of indebtedness of the Borrower may become entitled
(with the giving of notice or lapse of time or both) to accelerate the maturity
of such indebtedness, or the maturity of any such indebtedness is accelerated.

     4.2 Upon the occurrence and during the continuance of an Event of Default
hereunder, the Lender may, at its option, declare the outstanding Loans
hereunder, the Note and any other obligations of the Borrower to the Lender
under this Agreement to be immediately due and payable; provided that, upon the
occurrence of any event specified in paragraph 4.1(d), the Loans, the Note and
any other such obligations of the Borrower to the Lender shall become
immediately due and payable without declaration or other notice to the Borrower.

     4.3 In the event that the payment of the Loans and the Note shall be
accelerated pursuant to Section 4.2, the Lender may setoff and apply all monies
credited to the Borrower then held by the Lender on deposit or otherwise to the
payment of the Loans, the Note and all other amounts then due hereunder. The
Lender agrees promptly to notify the Borrower after any such setoff and
application by the Lender.

                            SECTION 5. GOVERNING LAW

     Pursuant to Section 5-1401 of the New York General Obligations Law, this
Agreement shall be governed by the law of the State of New York.

                            SECTION 6. MISCELLANEOUS

     6.1 This Agreement shall be binding on and inure to the benefit of the
Borrower and the Lender and their respective successors and assigns.

     6.2 The Borrower may not assign, pledge or otherwise transfer its rights or
obligations under this Agreement (or any borrowing hereunder), the Note or any
interest herein or therein without the prior written consent of the Lender. The
Lender may (1) pledge the Note evidencing Loans hereunder to any Federal Reserve
Bank, and (2) sell participations in any Loan hereunder.

                                       4

<PAGE>

     6.3 No delay or failure on the part of the Lender in exercising any right,
remedy or power hereunder shall operate as a waiver thereof, nor shall any
single or partial exercise of any such right, remedy or power preclude any other
or further exercise thereof or the exercise of any other right, remedy or power.
The rights and remedies of the Lender hereunder are cumulative and not exclusive
of any rights or remedies which the Lender may otherwise have at law or in
equity.

     6.4 The Borrower agrees to pay all reasonable out-of-pocket costs and
expenses (including reasonable fees and expenses of attorneys) incurred by the
Lender in connection with the preparation, execution or amendment of this
Agreement or the Note or the enforcement of this Agreement or the Note.

     6.5 This Agreement shall remain in full force and effect until the later to
occur of (a) July 31, 2002, and (b) the payment in full of all Loans and other
amounts due under this Agreement and the Note.

     6.6 This Agreement may be executed simultaneously in any number of
counterparts, each of which shall be deemed to be an original, and all of which,
taken together, shall constitute one and the same instrument.

     IN WITNESS WHEREOF, the parties have executed this Uncommitted Credit
Agreement as of the day and year first above written.

Zimmer, Inc.                                      Zimmer, Inc.

By:                                               By:
   ---------------------------                       ---------------------------
Name:                                             Name:
Title:                                            Title:

                                             Sumitomo Mitsui Banking Corporation

                                                  By:
                                                     ---------------------------
                                                     Name:
                                                     Title:

                                       5
<PAGE>

                                    EXHIBIT A

                                  CONFIRMATION

Borrower:                                    Zimmer, Inc.

Lender:                                      Sumitomo Mitsui Banking Corporation

Date of this Confirmation:

Date of Loan:

Principal Amount of Loan:

Interest Rate:

Interest Calculation Periods (if applicable):

Day Count for Interest Calculations (if applicable):

Interest Payment Date(s):

Principal Payment Date(s)

Other Terms and Conditions:

Agreed:

Sumitomo Mitsui Banking Corporation

By:
   -----------------------------
         Name:
         Title:

Zimmer, Inc.

By:
   -----------------------------

         Name:
         Title:

                                       6
<PAGE>

                                    EXHIBIT B

                                 PROMISSORY NOTE

$10,000,000.00                                            Date: October 29, 2001

     For value received, Zimmer, Inc. (the "Borrower") promises to pay on the
dates agreed pursuant to the Credit Agreement referenced below, and in any event
on July 31, 2002, to the order of Sumitomo Mitsui Banking Corporation (the
"Lender"), at Lender's New York office, Ten Million United States Dollars (US
$10,000,000.00) or, if less, the aggregate, outstanding unpaid principal amount
of all loans made by the Lender to the Borrower pursuant to the Uncommitted
Credit Agreement dated as of October 29, 2001 (the "Credit Agreement") between
the Borrower and the Lender, as indicated on the schedule (the "Schedule")
attached hereto, plus interest thereon in like funds for the period from (and
including) the date each loan is made by the Lender to the Borrower to (but
excluding) the date on which the amount of such loan is paid by the Borrower to
the Lender at such rate(s) and on such interest payment date(s) as are agreed
from time to time by the Borrower and the Lender and set forth in Confirmations
issued pursuant to such Credit Agreement and the Schedule. After maturity, each
loan shall bear interest, payable on demand for each date at an interest rate
per annum equal to 2% in excess of the rate the Lender announces as its "prime
rate" in effect for such day.

     The principal amount, interest rate, interest payment date(s) and principal
payment date(s) for each loan shall be as set forth in Confirmations issued
pursuant to the Credit Agreement and, prior to any permitted assignment or other
transfer of this Note, shall be set forth by Lender on the Schedule attached
hereto. Each entry to the Schedule shall be initialed by the Lender.

     If an Event of Default as defined in the Credit Agreement shall have
occurred and be continuing, then, in each such event, the Lender may declare
this Note and all loans evidenced by this Note to be due and payable, whereupon
the same shall forthwith become and be due and payable, without the necessity or
any presentment, demand, protest or further notice; provided, however, that the
principal amount outstanding under this Note plus interest thereon shall be
deemed to be immediately due and payable upon the occurrence of any event
described in paragraph 4.1 of (d) of the Credit Agreement.

     Pursuant to Section 5-1401 of the New York General Obligations Law, the
Borrower and the Lender agree that this Note and any disputes arising hereunder
shall be governed by the law of the State of New York.

Zimmer, Inc.                                  Zimmer, Inc.

By:                                           By:
   -----------------------------                 -----------------------------
Name:                                         Name:
Title:                                        Title:

                                        7
<PAGE>

                           SCHEDULE TO PROMISSORY NOTE

<TABLE>
<CAPTION>

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<S>              <C>               <C>                <C>               <C>           <C>             <C>
                                    Interest
  Date of        Principal          Rate for           Maturity         Interest      Interest        Principal
    Loan          Amount              Loan             Date(s)          Accrued         Paid             Paid
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</TABLE>

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