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                                                                   EXHIBIT 4.9


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                                    SERIES A
                                WARRANT AGREEMENT



                                     Between



                                   POWERBRIEF
                      (f/k/a Integrated Orthopaedics, Inc.)



                                       And



                   CONTINENTAL STOCK TRANSFER & TRUST COMPANY



                         Dated as of _____________, 2001






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<TABLE>
<S>     <C>                                                                                                  <C>
SECTION 1. Definitions; Accounting Terms and Determinations....................................................2

         1.01. Definitions.....................................................................................2

         1.02. Accounting Terms and Determinations.............................................................5

         1.03. Designation of Warrants.........................................................................5

SECTION 2. Appointment of Warrant Agent........................................................................5

         2.01. Appointment of Warrant Agent....................................................................5

SECTION 3. Issuance of Warrants................................................................................5

         3.01. Warrant Certificates............................................................................5

         3.02. Registration and Countersignature...............................................................5

         3.03. Exchange for Original PowerBrief Securities.....................................................5

SECTION 4. Execution of Warrant Certificates...................................................................6

SECTION 5. Registration of Transfers and Exchanges.............................................................6

         5.01. Transfer and Exchange of Warrants...............................................................6

         5.02. Obligations with Respect to Transfers and Exchanges of Warrants.................................7

SECTION 6. Adjustments.........................................................................................7

         6.01. Dividends, Distributions and Purchases..........................................................7

         6.02. Subdivisions and Combinations...................................................................7

         6.03. Issuance of Common Stock........................................................................8

         6.04. Issuance of other Securities, Rights or Obligation..............................................8

         6.05. Superseding Adjustment..........................................................................9

         6.06. Other Provisions Applicable to Adjustments under this Section 6................................10

         6.07. Merger, Consolidation or Disposition of Assets.................................................11

         6.08. Other Action Affecting Common Stock............................................................11

         6.09. Notices of Adjustments.........................................................................11

         6.10. Notice of Certain Corporate Action.............................................................12

SECTION 7. Holder's Rights....................................................................................12

         7.01. Taxes .........................................................................................12

         7.02. Mutilated or Missing Warrant Certificates......................................................13

SECTION 8. Other Covenants of Issuer..........................................................................13

         8.01. Conflicting Agreements.........................................................................13

         8.02. Reservation of Shares..........................................................................13

SECTION 9. Warrant Agent......................................................................................13

         9.01. Merger, Consolidation or Change of Name of Warrant Agent.......................................13
</TABLE>


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<TABLE>
<S>      <C>                                                                                                <C>
         9.02. Warrant Agent's Right and Responsibilities.....................................................14

         9.03. Resignation and Removal of Warrant Agent; Appointment of Successor.............................15

SECTION 10. Miscellaneous.....................................................................................16

         10.01. Notices to Issuer and Warrant Agent...........................................................16

         10.02. Supplements and Amendments....................................................................17

         10.03. Successors....................................................................................17

         10.04. Termination...................................................................................17

         10.05. Governing Law.................................................................................17

         10.06. Benefits of This Agreement....................................................................17
</TABLE>


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                           SERIES A WARRANT AGREEMENT

         This Series A Warrant Agreement (this "Agreement") is made and entered
into as of ____________, 2001, by and between PowerBrief, Inc. (f/k/a Integrated
Orthopaedics, Inc.), a corporation duly organized and validly existing under the
laws of the State of Texas (the "Issuer"), and Continental Stock Transfer &
Trust Company, a New York corporation, as warrant agent (together with any and
all successors appointed in accordance with this Agreement, the "Warrant
Agent").

         WHEREAS, the Issuer is the surviving company in a merger between
PowerBrief, Inc., a Delaware corporation ("Original PowerBrief") and the Issuer
under its prior name, Integrated Orthopaedics, Inc. (the "Merger"), pursuant to
the terms of that certain Agreement and Plan of Merger dated September 15, 2000,
as amended (the "Merger Agreement");

         WHEREAS, pursuant to the Merger Agreement, concurrently with the
Merger, the Issuer has effected a five (5) for one (1) reverse stock split (the
"Merger Reverse Stock Split");

         WHEREAS, pursuant to the Merger Agreement, upon the consummation of the
Merger, each share of Original PowerBrief Common Stock (as defined below) shall
be converted into the right to receive (A) a certain number of shares of Common
Stock (as defined below), (B) a Series B Warrant to purchase a certain number of
shares of Common Stock, and (C) a Series A Warrant, which is to be issued
pursuant to this Agreement, to purchase 0.0274 of a share of Common Stock, which
amount reflects the Merger Reverse Stock Split;

         WHEREAS, pursuant to the Merger Agreement, upon the consummation of the
Merger, each share of Original PowerBrief Preferred Stock (as defined below)
shall be converted into the right to receive (A) a certain number of shares of
Common Stock, (B) a Series B Warrant to purchase a certain number of shares of
Common Stock, and (C) a Series A Warrant, which is to be issued pursuant to this
Agreement, to purchase 0.0822 of a share of Common Stock, which amount reflects
the Merger Reverse Stock Split;

         WHEREAS, pursuant to the terms of the Merger Agreement, each
outstanding warrant to purchase securities of Original PowerBrief (the "Original
PowerBrief Warrants") shall, after the Merger, be exercisable for the same
number of shares of Common Stock, Series A Warrants and Series B Warrants as the
holders of such warrants would have received in the Merger if such warrants had
been exercised immediately prior to the Merger, and such Series A Warrants shall
be issued pursuant to this Agreement;

         WHEREAS, the Issuer desires the Warrant Agent to act on behalf of the
Issuer, and the Warrant Agent is willing so to act, in connection with the
issuance of the Warrant Certificates (hereinafter defined) and other matters as
provided herein.

         NOW, THEREFORE, in consideration of the premises and the mutual
agreements herein set forth and for the purposes of defining the relative rights
and obligations of the Issuer, the Warrant Agent and the Holders, the parties
hereto, agree as follows:


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SECTION 1. Definitions; Accounting Terms and Determinations.

         1.01. Definitions. As used herein, the following terms shall have the
following meanings (all terms defined in this Section 1 or in other provisions
of this Agreement in the singular to have the same meanings when used in the
plural and vice versa):

         "Affiliate" shall mean, with respect to a specified Person, another
Person that directly, or indirectly through one or more intermediaries, Controls
or is Controlled by or is under common Control with the Person specified.

         "Board" shall mean the Board of Directors of Issuer.

         "Business Day" shall mean any day that is not a Saturday, Sunday or
other day on which commercial banks in the City of New York are authorized or
required by law to remain closed.

         "Commission" shall mean the Securities and Exchange Commission or any
other similar or successor agency of the Federal government administering the
Securities Act and/or the Exchange Act.

         "Common Stock" shall mean the Common Stock of the Issuer, par value
$0.001 per share, or any other common stock or other securities receivable
thereon, or into which the Common Stock is convertible or exchangeable, as a
result of any recapitalization, reclassification, merger or consolidation of, or
disposition of assets by, the Issuer.

         "Control" shall mean the possession, directly or indirectly, of the
power to direct or cause the direction of the management or policies of a
Person, whether through the ability to exercise voting power, by contract or
otherwise. "Controls" and "Controlled" shall have meanings correlative thereto.

         "Exchange Act" shall mean the Securities Exchange Act of 1934, as
amended, 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.

         "Excluded Securities" shall mean, collectively, (i) shares of Common
Stock issued to the stockholders and warrant holders of Original PowerBrief in
the Merger pursuant to the terms of the Merger Agreement, (ii) the Series B
Warrants, (iii) shares of Common Stock to be issued upon the exercise of the
Series B Warrants, (iv) shares of Common Stock issued pursuant to Section
2.1(a)(iii) of the Merger Agreement to adjust the percentage ownership of the
Issuer after the Merger among the pre-Merger shareholders of the Issuer, on the
one hand, and the pre-Merger stockholders of Original PowerBrief, on the other
hand, (v) shares of Common Stock issuable upon the exercise of any outstanding
options or warrants of the Issuer to purchase Common Stock outstanding on the
date of this Agreement, (vi) any shares of Common Stock issuable upon the
exercise of any options or warrants to purchase common stock of Original
PowerBrief, the obligations of which were assumed by the Issuer in the Merger
pursuant to the Merger Agreement, (vii) the grant of warrants, options or other
rights to purchase, or the sale or issuance of, shares of Common Stock under any
compensatory equity incentive plan, employee benefit plan or other compensatory
plan or agreement (including any such plan or agreement entered into with any
director or consultant) that is approved by the Board, provided that, such
warrants, options or other rights to purchase, or the sale or issuance of,
shares of Common Stock, granted or issued within one year after the Issue Date
to Persons that were employees of Original PowerBrief on July 31, 2000 shall
require unanimous approval of the Board, (viii) any Common Stock issued upon the
exercise or conversion of options, rights or securities (A) for which an
adjustment has already been made pursuant to


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         Section 6.04 or (B) that otherwise satisfy this definition of Excluded
Securities, (ix) a combination of shares of Common Stock and/or options, rights
or securities convertible into, or exercisable for shares of Common Stock up to
an aggregate amount equal to five percent (5%) of the shares of Common Stock
outstanding immediately after the effective time of the Merger (as adjusted for
any stock split, reverse stock split or other combination resulting in a larger
or smaller number of shares of Common Stock), excluding any shares held in
escrow pursuant to Section 2.17 of the Merger Agreement, issued to Persons with
which the Issuer has business relationships, provided that such issuances
described in this clause (ix) are (A) for strategic purposes, such as
advertising, outsourcing or licensing arrangements with any customer, supplier
or other provider of products or services; (B) not primarily for equity
financing purposes and (C) approved by the Board, (x) Common Stock and/or
options, rights or securities convertible into, or exercisable for, Common
Stock, provided that the Board unanimously approves the issuance of such
securities and resolves that such issuance is to be made without any adjustment
in Section 6, and provided that the Board, at the time of such approval,
consists of (A) at least one member of the Board as constituted immediately
before the Merger or (B) at least one member who is an Affiliate of FW
integrated Orthopaedics Investors, L.P. or FW Integrated Orthopaedics Investors
II, L.P., and (xi) any issuance, to holders of Common Stock, of Common Stock, or
securities that are exercisable or convertible into or exchangeable for Common
Stock, without consideration (a "Without Consideration Issuance"), if the
Holders of the Warrants also receive a number of shares of Common Stock or a
number or amount of such exercisable, convertible or exchangeable securities
that are equal to the number or amount thereof they would have received had they
exercised all of their Warrants for Common Stock immediately prior to the record
date for such Without Consideration Issuance.

         "Exercise Price" shall have the meaning assigned to such term in the
form of Warrant Certificate attached as Annex 1 hereto.

         "Expiration Date" shall have the meaning assigned to such term in the
form of the Warrant Certificate attached as Annex 1 hereto.

         "GAAP" shall mean generally accepted accounting principles,
consistently applied throughout the specified period.

         "Governmental Authority" shall mean the government of the United States
of America, any other nation or any political subdivision thereof, whether state
or local, and any agency, authority, instrumentality, regulatory body, court,
central bank or other entity exercising executive, legislative, judicial,
taxing, regulatory, monetary or administrative powers or functions of or
pertaining to government.

         "Holder" shall have the meaning assigned to such terms in Section
5.02(c).

         "include" and "including" shall be construed as if followed by the
phrase "without being limited to".

         "Issuer" shall have the meaning assigned to such term in the preamble
of this Agreement.

         "Issue Date" shall mean the effective date of the Merger.

         "Merger" shall have the meaning assigned to such term in the recitals
of this Agreement.

         "Merger Agreement" shall have the meaning assigned to such term in the
recitals of this Agreement.

         "Original PowerBrief" shall have the meaning assigned to such term in
the recitals of this Agreement.


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         "Original PowerBrief Common Stock" shall mean the common stock, par
value $0.01 per share, of Original PowerBrief in existence prior to the Merger.

         "Original PowerBrief Preferred Stock" shall mean the Series A Preferred
Stock, par value $0.01 per share, of Original PowerBrief in existence prior to
the Merger.

         "Original PowerBrief Warrants" shall have the meaning assigned to such
term in the recitals of this Agreement.

         "Person" shall mean any natural person, corporation, limited liability
company, trust, joint venture, association, company, partnership, Governmental
Authority or other entity.

         "Securities Act" shall mean the Securities Act of 1933, as amended, 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.

         "Series B Warrants" shall mean the Series B Warrants of the Issuer
issued to the stockholders and warrant holders of Original PowerBrief in the
Merger.

         "Stock Unit" shall mean 0.0274 of a share of Common Stock, as such
Common Stock is constituted on the date hereof after giving effect to the Merger
Reverse Stock Split, and thereafter shall mean such number of shares (including
any fractional shares) of Common Stock and other securities, cash or other
property as shall result from the adjustments specified in Section 6.

         "Surrender Documents" shall mean (i) a certificate representing shares
of Original PowerBrief Common Stock or Original PowerBrief Preferred Stock, (ii)
a letter of transmittal for such certificate which shall specify that delivery
shall be effective upon delivery of such certificate to the Warrant Agent, and
(iii) such other documents as the Warrant Agent reasonably requires.

         "Warrant Agent" shall have the meaning assigned to such term in the
preamble of this Agreement.

         "Warrant Certificates" shall have the meaning assigned such term in
Section 3.01.

         "Warrant Stock" shall mean all shares of Common Stock issuable from
time to time upon exercise of a Warrant.

         "Warrants" shall mean the Series A Warrants issued by the Issuer
pursuant to this Agreement, each evidencing a right to purchase one Stock Unit,
and all Warrants issued upon transfer, division or combination of, or in
substitution for, any thereof.

         "Whole Unit" shall mean the aggregate of Stock Units, or portion
thereof, constituting one (1) share of Common Stock.

         1.02. Accounting Terms and Determinations. Except as otherwise may be
expressly provided herein, all accounting terms used herein shall be interpreted
in accordance with GAAP.



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All calculations made for the purposes of determining compliance with the terms
of this Agreement shall (except as otherwise may be expressly provided herein)
be made by application of GAAP.

         1.03. Designation of Warrants. The Warrants issued pursuant to this
Agreement shall be designated as the Issuer's "Series A Warrants."

         SECTION 2. Appointment of Warrant Agent.

         2.01. Appointment of Warrant Agent. The Issuer hereby appoints the
Warrant Agent to act as agent for the Issuer in accordance with the instructions
set forth hereinafter in this Agreement, and the Warrant Agent hereby accepts
such appointment.

         SECTION 3. Issuance of Warrants.

         3.01. Warrant Certificates. Upon request a Holder may receive from the
Warrant Agent a certificate evidencing its Warrants (the "Warrant
Certificates"), substantially in the form of Annex 1 as set forth in Section 5
below.

         3.02. Registration and Countersignature. The Warrant Agent, on behalf
of the Issuer, shall number and register the Warrant Certificates in a register
as they are issued by the Issuer. Warrant Certificates shall be manually
countersigned by the Warrant Agent and shall not be valid for any purpose unless
so countersigned. The Issuer and the Warrant Agent may deem and treat the
Holder(s) of the Warrant Certificates as the absolute owner(s) thereof
(notwithstanding any notation of ownership or other writing thereon made by
anyone), for all purposes, and neither the Issuer nor the Warrant Agent shall be
affected by any notice to the contrary.

         3.03. Exchange for Original PowerBrief Securities.

               (a) Original PowerBrief Common Stock. Upon receipt by the Warrant
Agent of Surrender Documents for a certificate of shares of Original PowerBrief
Common Stock, the Warrant Agent shall countersign, issue and deliver to the
holder of such certificate of Original PowerBrief Common Stock a Warrant
Certificate representing one (1) Warrant for each share of Original PowerBrief
Common Stock represented by the certificate so surrendered.

               (b) Original PowerBrief Preferred Stock. Upon receipt by the
Warrant Agent of Surrender Documents for shares of Original PowerBrief Preferred
Stock, the Warrant Agent shall countersign, issue and deliver to the holder of
such certificate of Original PowerBrief Preferred Stock a Warrant Certificate
representing three (3) Warrants for each share of Original PowerBrief Preferred
Stock represented by the certificate so surrendered.

               (c) Exercise of Original PowerBrief Warrants. Upon written
instructions of the Chairman of the Board, the President, the Chief Financial
Officer, any Vice President, the Treasurer, or the Secretary of the Issuer, the
Warrant Agent shall countersign, issue and deliver Warrant Certificates in
denominations and amounts, and to the holders, as so instructed by such officer
for the proper exercise of any Original PowerBrief Warrants pursuant to the
terms of the Merger Agreement.



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               (d) Lost Certificate. Upon written instructions of the Chairman
of the Board, the President, the Chief Financial Officer, any Vice President,
the Treasurer, or the Secretary of the Issuer, the Warrant Agent shall
countersign, issue and deliver Warrant Certificates in denominations and
amounts, and to the holders, as so instructed by such officer for certificates
of Original PowerBrief Common Stock or Original PowerBrief Preferred Stock
claimed by such holder as lost, stolen or destroyed.

         SECTION 4. Execution of Warrant Certificates. The Warrant Certificates
to be delivered pursuant hereto shall be signed on behalf of the Issuer by its
Chairman of the Board, President, Chief Executive Officer, Chief Financial
Officer, any Vice President, Secretary, an Assistant Secretary, Treasurer or an
Assistant Treasurer. Each such signature upon the Warrant Certificates may be in
the form of a facsimile signature of the present or any future Chairman of the
Board, President, Chief Executive Officer, Chief Financial Officer, any Vice
President, Secretary, an Assistant Secretary, Treasurer or an Assistant
Treasurer and may be imprinted or otherwise reproduced on the Warrant
Certificates and for that purpose the Issuer may adopt and use the facsimile
signature of any person who shall have been Chairman of the Board, President,
Chief Executive Officer, Chief Financial Officer, any Vice President, Secretary,
an Assistant Secretary, Treasurer or an Assistant Treasurer, notwithstanding the
fact that at the time the Warrant Certificates shall be countersigned and
delivered or disposed of such person shall have ceased to hold such office.

         In case any officer of the Issuer who shall have signed any of the
Warrant Certificates shall cease to be such officer before the Warrant
Certificates so signed shall have been countersigned by the Warrant Agent, or
disposed of by the Issuer, such Warrant Certificates nevertheless may be
countersigned and delivered or disposed of as though such person had not ceased
to be such officer of the Issuer; and any Warrant Certificate may be signed on
behalf of the Issuer by any person who, at the actual date of the execution of
such Warrant Certificate, shall be a proper officer of the Issuer to sign such
Warrant Certificate, although at the date of the execution of this Agreement any
such person was not such officer.

         Warrant Certificates shall be dated the date of countersignature.

         SECTION 5. Registration of Transfers and Exchanges.

         5.01. Transfer and Exchange of Warrants.

         When Warrant Certificates are presented to the Warrant Agent with a
request:

               (a) to register the transfer of the Warrants represented by such
Warrant Certificates; or

               (b) to exchange such Warrant Certificates for Warrant
Certificates representing an equal number of Warrants of other authorized
denominations,

the Warrant Agent shall register the transfer or make the exchange as requested;
provided, however, that the Warrant Certificates presented or surrendered for
registration of transfer or exchange shall be duly endorsed or accompanied by a
written instruction of transfer in form


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<PAGE>   10

satisfactory to the Warrant Agent, duly executed by the Holder thereof or by his
attorney, duly authorized in writing.

         5.02. Obligations with Respect to Transfers and Exchanges of Warrants.


               (a) To permit registrations of transfers and exchanges, the
Issuer shall execute and the Warrant Agent is hereby authorized to countersign,
in accordance with the provisions of Sections 3 and 4, Warrant Certificates as
required pursuant to the provisions of this Section 5.

               (b) All Warrant Certificates issued upon any registration of
transfer or exchange of Warrant Certificates shall be the valid obligations of
the Issuer, entitled to the same benefits under this Agreement as the Warrant
Certificates surrendered upon such registration of transfer or exchange.

               (c) Prior to due presentment for registration of transfer or
exchange of any Warrant Certificate, the Warrant Agent and the Issuer may deem
and treat the Person in whose name any Warrant Certificate is registered (the
"Holder") as the absolute owner of the Warrants represented by such Warrant
Certificate and neither the Warrant Agent, nor the Issuer shall be affected by
notice to the contrary.

               (d) No service charge shall be made to a Holder for any
registration, transfer or exchange.

         SECTION 6. Adjustments.

         6.01. Dividends, Distributions and Purchases.

               (a) If the Issuer shall pay or distribute during any calendar
quarter any cash dividend to holders of its Common Stock in excess of 0.75 % of
the market price of its Common Stock immediately prior to the declaration of
such dividend, then the aggregate Exercise Price for a Whole Unit shall be
adjusted downward by the per share amount of such dividend; and

               (b) If at any time the Issuer shall pay any dividend or make any
other distribution to holders of its Common Stock of any evidence of
indebtedness or other property of any nature whatsoever (other than as provided
in Sections 6.01(a), 6.02, 6.03(i)(A) and 6.04(i)(A) (which such Section 6.04
(i)(A) shall include any dividend by the Issuer of rights to purchase its equity
securities)), the Issuer shall at the same time pay or distribute to each Holder
of Warrants that is by their terms then exercisable (whether or not such Holder
exercises such Warrants) the evidence of indebtedness or other property such
Holder would have been entitled to receive if, such Holder had exercised such
Warrants immediately prior to the record date for such dividend or distribution.

         6.02. Subdivisions and Combinations. If at any time the Issuer shall:

               (a) take a record of the holders of its Common Stock for the
purpose of entitling them to receive a dividend or other distribution of Common
Stock;



                                       7

<PAGE>   11

               (b) subdivide, split or reclassify its outstanding shares of
Common Stock into a larger number of shares of Common Stock; or

               (c) combine its outstanding shares of Common Stock into a smaller
number of shares of Common Stock;

then immediately after the occurrence of any such event the number of shares of
Warrant Stock comprising a Stock Unit shall be adjusted so that each Holder
would receive upon exercise of its Warrants the number of shares of Warrant
Stock that such Holder would have been entitled to receive if such Holder had
exercised its Warrants immediately prior to the occurrence of such event.

         6.03. Issuance of Common Stock. In case at any time the Issuer (i)(A)
shall take a record of the holders of its Common Stock for the purpose of
entitling them to subscribe for or purchase shares of any class or series of
Common Stock or (B) shall otherwise sell or issue such securities and (ii) the
consideration per share of Common Stock to be paid upon such issuance or
subscription is less than aggregate Exercise Price for a Whole Unit on such
record date, then the Exercise Price shall be adjusted to be that price
determined by dividing (i) an amount equal to the sum of (A) the product of (1)
the number of shares of Common Stock outstanding immediately before such
issuance, distribution, subscription or purchase and (2) the then existing
aggregate Exercise Price for a Whole Unit plus (B) the aggregate consideration,
if any, received by the Issuer upon such issuance for the total number of shares
of Common Stock to be issued, distributed, subscribed for or purchased, by (ii)
the total number of shares of Common Stock outstanding immediately after such
issuance, distribution, subscription or purchase; provided, however, this
Section 6.03 shall not apply to the issuance of Excluded Securities.

Aggregate consideration for purposes of this Section 6.03 shall be determined as
follows: In case any shares of Common Stock shall be issued or sold for cash,
the consideration received therefor shall be deemed to be the amount payable to
the Issuer therefor, after deduction therefrom of any expenses incurred or any
underwriting commissions or concessions or discounts or, in the case of a
private placement thereof, finders' fees or commissions paid or allowed by the
Issuer in connection therewith. In case any shares of Common Stock shall be
issued or sold for a consideration other than cash payable to the Issuer, the
consideration received therefor shall be deemed to be the fair value of such
consideration as determined by the Board, after deduction therefrom of any
expenses incurred or any underwriting commissions or concessions or discounts
paid or allowed by the Issuer in connection therewith. In case any shares of
Common Stock shall be issued in connection with any merger of another
corporation into the Issuer, the amount of consideration therefor shall be
deemed to be the fair value as determined by the Board of such portion of the
assets of such merged corporation as the Board shall determine to be
attributable to such shares of Common Stock.

         6.04. Issuance of other Securities, Rights or Obligation. In case at
any time the Issuer (i)(A) shall take a record of the holders of its Common
Stock for the purpose of entitling them to subscribe for or purchase options to
purchase or rights to subscribe for Common Stock or securities directly or
indirectly convertible into or exchangeable for Common Stock (or options or
rights with respect to such securities) or (B) shall otherwise issue or sell any
such options, rights or securities and (ii) the consideration per share for
which Common Stock is deliverable




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<PAGE>   12


upon exercise of such options or rights or conversion or exchange of such
securities (determined by dividing (x) the total amount received or receivable
by the Issuer in consideration of the issuance of or subscription for such
options, rights or securities, plus the minimum aggregate amount of premiums (if
any) payable to the Issuer upon such exercise, conversion or exchange, by (y)
the total maximum number of shares of Common Stock necessary to effect the
exercise, conversion or exchange of all such options, rights or securities)
shall be less than the aggregate Exercise Price for a Whole Unit on such record
date or sale or issuance date, as the case may be, then the number of shares of
Warrant Stock comprising a Stock Unit shall be adjusted to be that number
determined by multiplying the number of shares of Warrant Stock comprising a
Stock Unit immediately prior to such date by a fraction (not to be less than
one) (i) the numerator of which shall be equal to the product of (A) the total
maximum number of shares of Common Stock outstanding after giving effect to the
assumed exercise or conversion of all such options, rights or securities and (B)
the aggregate Exercise Price for a Whole Unit determined immediately before such
date and (ii) the denominator of which shall be equal to the sum of (A) the
product of (1) the number of shares of Common Stock outstanding immediately
before such date and (2) the aggregate Exercise Price for a Whole Unit
determined immediately before such date and (B) the aggregate consideration
(determined as set forth in subsection (ii)(x) and (y) above) for which Common
Stock is deliverable upon exercise, conversion or exchange of such options,
rights or securities; provided, however, that this Section 6.04 shall not apply
to the issuance of Excluded Securities. Aggregate consideration for purposes of
the immediately preceding clause (B) shall be determined as follows: In case any
options, rights or convertible or exchangeable securities (or options or rights
with respect thereto) shall be issued or sold, or exercisable, convertible or
exchangeable for cash, the consideration received therefor shall be deemed to be
the amount payable to the Issuer (determined as set forth in subsection (ii)(x)
and (y) above) therefor, after deduction therefrom of any expense incurred or
any underwriting commissions or concessions or discounts or, in the case of a
private placement thereof, finders' fees or commissions paid or allowed by the
Issuer in connection therewith. In case any such options, rights or securities
shall be issued or sold, or exercisable, convertible or exchangeable for a
consideration other than cash payable to the Issuer, the consideration received
therefor (determined as set forth in subsection (ii)(x) and (y) above) shall be
deemed to be the fair value of such consideration as determined by the Board,
after deduction therefrom of any expenses incurred or any underwriting
commissions or concessions or discounts paid or allowed by the Issuer in
connection therewith. In case any such options, rights or securities shall be
issued or sold, or exercisable, convertible or exchangeable in connection with
any merger of another corporation into the Issuer, the amount of consideration
therefor shall be deemed to be the fair value as determined by the Board of such
portion of the assets of such merged corporation as the Board shall determine to
be attributable to such options, rights or securities.

         6.05. Superseding Adjustment. If, at any time after any adjustment in
the number of shares of Warrant Stock comprising a Stock Unit shall have been
made on the basis of the issuance of any options or rights, or convertible or
exchangeable securities (or options or rights with respect to such securities)
pursuant to Section 6.04 hereof:

               (a) the options or rights shall expire prior to exercise or the
right to convert or exchange any such securities shall terminate; or



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<PAGE>   13

               (b) the consideration per share for which shares of Common Stock
are issuable pursuant to the terms of such options or rights or convertible or
exchangeable securities shall be increased or decreased, other than under or by
reason of provisions designed to protect against dilution;

such previous adjustment shall be rescinded and annulled. Thereupon, a
recomputation shall be made of the effect of such options or rights or
convertible or exchangeable securities with respect to shares of Common Stock on
the basis of

               (A)            treating the number of shares of Common Stock, if
                              any, theretofore actually issued or issuable
                              pursuant to the previous exercise, conversion or
                              exchange of such options, rights or securities as
                              having been issued on the date or dates of such
                              exercise, conversion or exchange and for the
                              consideration actually received and receivable
                              therefore, and

               (B)            treating any such options, rights or securities
                              which then remain outstanding as having been
                              granted or issued immediately after the time of
                              such increase or decrease for the consideration
                              per share for which shares of Common Stock are
                              issuable upon exercise, conversion or exchange of
                              such options, rights or securities.

To the extent called for by the foregoing provisions of this Section 6.05 on the
basis aforesaid, a new adjustment in the number of shares of Warrant Stock
comprising a Stock Unit shall be made, determined using the Exercise Price used
at the time of the original determination, which new adjustment shall supersede
the previous adjustment so rescinded and annulled. If the exercise, conversion
or exchange price provided for in any such option, right or security shall
decrease at any time under or by reason of provisions designed to protect
against dilution, then in the case of the delivery of shares of Common Stock
upon the exercise, conversion or exchange of any such option, right or security,
the Stock Unit purchasable upon the exercise of a Warrant shall forthwith be
adjusted in the manner which would have obtained had the adjustment made upon
issuance of such option, right or security been made upon the basis of the
issuance of (and the aggregate consideration received for) the shares of Common
Stock delivered as aforesaid.

         6.06. Other Provisions Applicable to Adjustments under this Section 6.
The following provisions shall be applicable to the making of adjustments of the
number of shares of Warrant Stock comprising a Stock Unit:

               (a) The sale or other disposition of any issued shares of Common
Stock owned or held by or for the account of the Issuer shall be deemed to be an
issuance thereof for purpose of this Section 6.

               (b) In computing adjustments under this Section 6, fractional
interest in Common Stock shall be taken into account to the nearest
one-thousandth of a share.

               (c) If the Issuer shall take a record of the holders of its
Common Stock for the purpose of entitling them to receive a dividend or
distribution or subscription or purchase rights and shall, thereafter and before
the distribution thereof, legally abandon its plan to pay or deliver such
dividend, distribution, subscription or purchase rights, then thereafter no
adjustment shall




                                       10
<PAGE>   14

be required by reason of the taking of such record and any such adjustment
previously made in respect thereof shall be rescinded, and annulled.

         6.07. Merger, Consolidation or Disposition of Assets. If the Issuer
shall merge or consolidate with another corporation, or shall sell, transfer or
otherwise dispose of all or substantially all of its assets to another
corporation and pursuant to the terms of such merger, consolidation or
disposition of assets, cash, shares of common stock or other securities of the
successor or acquiring corporation, or property of any nature is to be received
by or distributed to the holders of Common Stock of the Issuer, then each Holder
of Warrants that are by their terms then exercisable shall, at such Holder's
election, have the right to receive (whether or not such Holder exercises such
Warrants) the amount it would have been entitled to receive if the Holder had
exercised such Warrants immediately prior to the occurrence of such merger,
consolidation or disposition of assets, net of the Exercise Price of such
Warrants, and shall thereupon be deemed to have exercised such Warrants. In case
of any such merger, consolidation or disposition of assets in which the
foregoing election is not made, the successor or acquiring corporation (and any
affiliate thereof issuing securities) shall expressly assume the due and
punctual observance and performance of each and every covenant and condition of
the Warrants to be performed and observed by the Issuer and all of the
obligations and liabilities hereunder, subject to such modifications as may be
deemed appropriate (as determined by resolution of the Board) in order to
provide for adjustments of Stock Units which shall be as nearly equivalent as
practicable to the adjustments provided for in this Section. The foregoing
provisions shall similarly apply to successive mergers, consolidations and
dispositions of assets.

         6.08. Other Action Affecting Common Stock. If at any time or from time
to time the Issuer shall take any action affecting its Common Stock, other than
an action described in any of the foregoing subsections of this Section 6 or an
action taken in the ordinary course of the Issuer's business and consistent with
past practice, then, unless in the reasonable opinion of the Board such action
will not have a material adverse effect upon the rights of the Holder of the
Warrants, the terms of the Warrants shall be adjusted in such manner and at such
time as the Board shall in good faith determine to be equitable in the
circumstances, but no such adjustment shall decrease the number of shares of
Warrant Stock comprising a Stock Unit.

         6.09. Notices of Adjustments. Upon any adjustment of the Exercise Price
pursuant to this Section 6, the Issuer shall promptly thereafter (i) cause to be
filed with the Warrant Agent a certificate of the chief accounting officer of
the Issuer setting forth the Exercise Price after such adjustment and setting
forth in reasonable detail the method of calculation and the facts upon which
such calculations are based and setting forth the number of shares of Warrant
Stock (or portion thereof) comprising a Stock Unit and issuable after such
adjustment in the Exercise Price, upon exercise of a Warrant and payment of the
adjusted Exercise Price, which certificate shall be conclusive evidence of the
correctness of the matters set forth therein, and (ii) cause to be given to each
of the registered Holders of the Warrant Certificates at his address appearing
on the Warrant register written notice of such adjustments by first-class mail,
postage prepaid. The Warrant Agent shall be entitled to rely on the
above-referenced officer's certificate and shall be under no duty or
responsibility with respect to any such certificate, except to exhibit the same
from time to time to any Holder desiring an inspection thereof during reasonable
business hours. The Warrant Agent shall not at any time be under any duty or
responsibility to any Holder to




                                       11
<PAGE>   15


determine whether any facts exist that may require any adjustment of the number
of shares of Common Stock or other stock or property issuable on exercise of the
Warrants or the Exercise Price, or with respect to the nature or extent of any
such adjustment when made, or with respect to the method employed in making such
adjustment or the validity or value (or the kind or amount) of any shares of
Common Stock or other stock or property which may be issuable on exercise of the
Warrants. The Warrant Agent shall not be responsible for any failure of the
Issuer to make any cash payment or to issue, transfer or deliver any shares of
Common Stock or stock certificates or other common stock or property upon the
exercise of any Warrant.

         6.10. Notice of Certain Corporate Action. If the Issuer shall propose
(i) to pay any dividend to the holders of its Common Stock or to make any other
distribution to the holders of its Common Stock; (ii) to offer to the holders of
its Common Stock rights to subscribe for or to purchase any additional shares of
Common Stock (or options or rights with respect thereto); (iii) to effect any
reclassification of its Common Stock; (iv) to otherwise issue any Common Stock
or other securities, excluding the issuance, conversion, exercise or exchange of
Excluded Securities; (v) to effect any capital reorganization, excluding the
issuance, conversion, exercise or exchange of Excluded Securities; (vi) to
effect any consolidation, merger or sale, transfer or other disposition of all
or substantially all of its assets; or (vii) to effect the liquidation,
dissolution or winding up of the Issuer, then, in each such case, the Issuer
shall cause to be filed with the Warrant Agent and shall cause to be given to
each Holder of the Warrant Certificates at such Holder's address appearing on
the Warrant register by first-class mail, postage prepaid a notice of such
proposed action, which shall specify the date on which a record is to be taken
for the purposes of such dividend, distribution or right offer, or the date on
which such reclassification, issuance, reorganization, consolidation, merger,
sale, transfer, disposition, liquidation, dissolution or winding up is to take
place and the date of participation therein by the holders of Common Stock, if
any such date is to be fixed, and shall also set forth such facts with respect
thereto as shall be reasonably necessary to indicate the effect of such action
on the Common Stock, and the number of shares of Warrant Stock which will
comprise a Stock Unit after giving effect to any adjustment which will be
required as a result of such action. Such notice shall be so mailed in the case
of any action covered by clause (i) or (ii) above at least 20 days prior to the
record date for determining holders of the Common Stock for purposes of such
action, and in the case of any other such action, at least 20 days prior to the
date of the taking of such proposed action or the date of participation therein
by the holders of Common Stock, whichever shall be the earlier.

         SECTION 7. Holder's Rights.

         7.01. Taxes. The Issuer shall pay all taxes (other than Federal, state
or local income taxes) which may be payable in connection with the execution and
delivery of this Agreement or the issuance of the Warrants and Warrant Stock
hereunder or in connection with any modification of this Agreement or the
Warrant and shall hold the Holder harmless without limitation as to time against
any and all liabilities with respect to all such taxes. The obligations of the
Issuer under this Section 7.01 shall survive any redemption, repurchase or
acquisition of Warrant or Warrant Stock by the Issuer, any termination of this
Agreement, and any cancellation or termination of any Warrant.




                                       12
<PAGE>   16


         7.02. Mutilated or Missing Warrant Certificates. In case any of the
Warrant Certificates shall be mutilated, lost, stolen or destroyed, the Issuer
may in its discretion issue and the Warrant Agent may countersign, in exchange
and substitution for and upon cancellation of the mutilated Warrant Certificate,
or in lieu of and substitution for the Warrant Certificate lost, stolen or
destroyed, a new Warrant Certificate of like tenor and representing an
equivalent number of Warrants, but only upon receipt of evidence reasonably
satisfactory to the Issuer and the Warrant Agent of such loss, theft or
destruction of such Warrant Certificate and indemnity, if requested, also
reasonably satisfactory to them. Applicants for such substitute Warrant
Certificates shall also comply with such other reasonable regulations and pay
such other reasonable charges as the Issuer or the Warrant Agent may prescribe.

         SECTION 8. Other Covenants of Issuer.

         8.01. Conflicting Agreements. So long as any of the Warrants shall be
outstanding, the Issuer shall not at any time enter into an agreement or other
instrument limiting in any manner its ability to perform its obligations under
this Agreement or the Warrants, or making such performance or the issuance of
Warrant Stock upon the exercise of any Warrant a default under any such
agreement or instrument.

         8.02. Reservation of Shares. The Issuer shall at times that any
Warrants are outstanding, maintain a reserve of a sufficient number of shares of
Warrant Stock for issuance upon the exercise of such Warrants.

         SECTION 9. Warrant Agent.

         9.01. Merger, Consolidation or Change of Name of Warrant Agent. Any
corporation into which the Warrant Agent may be merged or with which it may be
consolidated, or any corporation resulting from any merger or consolidation to
which the Warrant Agent shall be a party, or any corporation succeeding to the
business of the Warrant Agent, shall be the successor to the Warrant Agent
hereunder without the execution or filing of any paper or any further act on the
part of any of the parties hereto, provided that such corporation would be
eligible for appointment as a successor warrant agent under the provisions of
Section 9.03. Any such successor Warrant Agent shall promptly cause notice of
its succession as Warrant Agent to be mailed (by first class mail, postage
prepaid) to each Holder at such Holder's last address as shown on the register
maintained by the Warrant Agent pursuant to this Agreement. In case at the time
such successor to the Warrant Agent shall succeed to the agency created by this
Agreement, and in case at that time any of the Warrant Certificates shall have
been countersigned but not delivered, any such successor to the Warrant Agent
may adopt the countersignature of the original Warrant Agent; and in case at
that time any of the Warrant Certificates shall not have been countersigned, any
successor to the Warrant Agent may countersign such Warrant Certificates either
in the name of the predecessor Warrant Agent or in the name of the successor to
the Warrant Agent; and in all such cases such Warrant Certificates shall have
the full force and effect provided in the Warrant Certificates and in this
Agreement.

         In case at any time the name of the Warrant Agent shall be changed and
at such time any of the Warrant Certificates shall have been countersigned but
not delivered, the Warrant Agent whose name has been changed may adopt the
countersignature under its prior name, and in case



                                       13
<PAGE>   17


at that time any of the Warrant Certificates shall not have been countersigned,
the Warrant Agent may countersign such Warrant Certificates either in its prior
name or in its changed name, and in all such cases such Warrant Certificates
shall have the full force and effect provided in the Warrant Certificates and in
this Agreement.

         9.02. Warrant Agent's Right and Responsibilities. The Warrant Agent
undertakes the duties and obligations imposed by this Agreement upon the
following terms and conditions, by all of which the Issuer and the Holders of
Warrants, by their acceptance thereof, shall be bound:

               (a) The statements contained herein and in the Warrant
Certificates shall be taken as statements of the Issuer and the Warrant Agent
assumes no responsibility for the correctness of any of the same except such as
describe the Warrant Agent or action taken or to be taken by it. The Warrant
Agent assumes no responsibility with respect to the distribution of the Warrant
Certificates except as herein otherwise provided.

               (b) The Warrant Agent shall not be responsible for any failure of
the Issuer to comply with any of the covenants contained in this Agreement or in
the Warrant Certificates to be complied with by the Issuer.

         The Warrant Agent may consult at any time with counsel satisfactory to
it (who may be counsel for the Issuer) and the Warrant Agent shall incur no
liability or responsibility to the Issuer or to any Holder of any Warrant
Certificate in respect of any action taken, suffered or omitted by it hereunder
in good faith and in accordance with the opinion or the advice of such counsel.

         The Warrant Agent shall incur no liability or responsibility to the
Issuer or to any Holder of any Warrant Certificate for any action taken in
reliance on any Warrant Certificate, certificate of shares, notice, resolution,
waiver, consent, order, certificate, or other paper, document or instrument
believed by it to be genuine and to have been signed, sent or presented by the
proper party or parties.

         The Issuer agrees to pay to the Warrant Agent such compensation for all
services rendered by the Warrant Agent in the execution of this Agreement as the
parties shall agree from time to time, to reimburse the Warrant Agent for all
expenses, taxes and governmental charges and other charges of any kind and
nature reasonably incurred by the Warrant Agent in the execution of this
Agreement and to indemnify the Warrant Agent and save it harmless against any
and all liabilities, including judgments, costs and counsel fees, for anything
done or omitted by the Warrant Agent in the execution of this Agreement except
as a result of its gross negligence or willful misconduct.

         The Warrant Agent shall be under no obligation to institute any action,
suit or legal proceeding or to take any other action likely to involve expense
unless the Issuer or one or more Holders of Warrant Certificates shall furnish
the Warrant Agent with security and indemnity satisfactory to the Warrant Agent
for any costs and expenses which may be incurred, but this provision shall not
affect the power of the Warrant Agent to take such action as it may consider
proper, whether with or without any such security or indemnity. All rights of
action under this Agreement or under any of the Warrants may be enforced by the
Warrant Agent without the



                                       14
<PAGE>   18


possession of any of the Warrant Certificates or the production thereof at any
trial or other proceeding relative thereto, and any such action, suit or
proceeding instituted by the Warrant Agent shall be brought in its name as
Warrant Agent and any recovery of judgment shall be for the ratable benefit of
the Holders of the Warrants, as their respective rights or interests may appear.
No provision of this Agreement shall require the Warrant Agent to expend or risk
its own funds.

         The Warrant Agent, and any stockholder, director, officer or employee
of it, may buy, sell or deal in any of the Warrants or other securities of the
Issuer or become pecuniarily interested in any transaction in which the Issuer
may be interested, or contract with or lend money to the Issuer or otherwise act
as fully and freely as though it were not Warrant Agent under this Agreement.
Nothing herein shall preclude the Warrant Agent from acting in any other
capacity for the Issuer or for any other legal entity.

         The Warrant Agent shall act hereunder solely as agent for the Issuer,
and its duties shall be determined solely by the provisions hereof. The Warrant
Agent shall not be liable for anything which it may do or refrain from doing in
connection with this Agreement except for its own gross negligence or willful
misconduct.

         The Warrant Agent shall not at any time be under any duty or
responsibility to any Holder of any Warrant Certificate to make or cause to be
made any adjustment of the Exercise Price or number of the Warrant Shares or
other securities or property deliverable as provided in this Agreement, or to
determine whether any facts exist which may require any of such adjustments, or
with respect to the nature or extent of any such adjustments, when made, or with
respect to the method employed in making the same. The Warrant Agent shall not
be accountable with respect to the validity or value or the kind or amount of
any Warrant Shares or of any securities or property which may at any time be
issued or delivered upon the exercise of any Warrant or with respect to whether
any such Warrant Shares or other securities will when issued be validly issued
and fully paid and nonassessable and makes no representation with respect
thereto.

         9.03. Resignation and Removal of Warrant Agent; Appointment of
Successor. No resignation or removal of the Warrant Agent and no appointment of
a successor warrant agent shall become effective until the acceptance of
appointment by the successor warrant agent as provided herein. The Warrant Agent
may resign its duties and be discharged from all further duties and liability
hereunder (except liability arising as a result of the Warrant Agent's own gross
negligence or willful misconduct) after giving written notice to the Issuer. The
Issuer may remove the Warrant Agent upon written notice, and the Warrant Agent
shall thereupon in like manner be discharged from all further duties and
liabilities hereunder, except as aforesaid. The Warrant Agent shall, at the
Issuer's expense, cause to be mailed (by first class mail, postage prepaid) to
each Holder of a Warrant at such Holder's last address as shown on the register
of the Issuer maintained by the Warrant Agent a copy of said notice of
resignation or notice of removal, as the case may be. Upon such resignation or
removal, the Issuer shall appoint in writing a new warrant agent. If the Issuer
shall fail to make such appointment within a period of 30 days after it has been
notified in writing of such resignation by the resigning Warrant Agent or after
such removal, then the resigning Warrant Agent or the Holder of any Warrant may
apply to any court of competent jurisdiction for the appointment of a new
warrant agent. Any new warrant agent,





                                       15
<PAGE>   19


whether appointed by the Issuer or by such a court, shall be a corporation doing
business under the laws of the United States or any state thereof, in good
standing and having a combined capital and surplus of not less than $50,000,000.
The combined capital and surplus of any such new warrant agent shall be deemed
to be the combined capital and surplus as set forth in the most recent annual
report of its condition published by such warrant agent prior to its
appointment, provided that such reports are published at least annually pursuant
to law or to the requirements of a federal or state supervising or examining
authority. After acceptance in writing of such appointment by the new warrant
agent, it shall be vested with the same powers, rights, duties and
responsibilities as if it had been originally named herein as the Warrant Agent,
without any further assurance, conveyance, act or deed; but if for any reason it
shall be necessary or expedient to execute and deliver any further assurance,
conveyance, act or deed, the same shall be done at the expense of the Issuer and
shall be legally and validly executed and delivered by the resigning or removed
Warrant Agent. Not later than the effective date of any such appointment, the
Issuer shall give notice thereof to the resigning or removed Warrant Agent.
Failure to give any notice provided for in this Section 9.03, however, or any
defect therein, shall not affect the legality or validity of the resignation of
the Warrant Agent or the appointment of a new warrant agent, as the case may be.

         SECTION 10. Miscellaneous.

         10.01. Notices to Issuer and Warrant Agent. Any notice or demand
authorized by this Agreement to be given or made by the Warrant Agent or by the
Holder of any Warrant Certificate to or on the Issuer shall be sufficiently
given or made when and if deposited in the mail, first class or registered,
postage prepaid, addressed (until another address is filed in writing by the
Issuer with the Warrant Agent), as follows:

                           PowerBrief, Inc.
                           5858 Westheimer, Suite 500
                           Houston, Texas 77057
                           Attention:   Chief Executive Officer
                           Telecopy:    (713) 526-4600
                           Telephone:   (713) 586-4790

         In case the Issuer shall fail to maintain such office or agency or
shall fail to give such notice of the location or of any change in the location
thereof, presentations may be made and notices and demands may be served at the
principal office of the Warrant Agent.

         Any notice pursuant to this Agreement to be given by the Issuer or by
the Holder(s) of any Warrant Certificate to the Warrant Agent shall be
sufficiently given when and if deposited in the mail, first-class or registered,
postage prepaid, addressed (until another address is filed in writing by the
Warrant Agent with the Issuer) to the Warrant Agent as follows:

                           Continental Stock Transfer & Trust Company
                           2 Broadway
                           New York, New York 10004
                           Telecopy:    (212) 509-4000
                           Attention:   Compliance Department


                                       16
<PAGE>   20


         10.02. Supplements and Amendments. The Issuer and the Warrant Agent may
from time to time supplement or amend this Agreement without the approval of any
Holders of Warrant Certificates in order to cure any ambiguity or to correct or
supplement any provision contained herein which may be defective or inconsistent
with any other provision herein, or to make any other provisions in regard to
matters or questions arising hereunder which the Issuer and the Warrant Agent
may deem necessary or desirable and which shall not in any way adversely affect
the interests of the Holders of Warrant Certificates. Any amendment or
supplement to this Agreement that has a material adverse effect on the interests
of Holders shall require the written consent of Holders representing a majority
of the then outstanding Warrants. The consent of each Holder of a Warrant
affected shall be required for any amendment pursuant to which the Exercise
Price would be increased or the number of Warrant Shares purchasable upon
exercise of Warrants would be decreased (other than pursuant to adjustments
provided for in Section 6 hereof or amendments to Section 6 which can be made by
the written consent of Holders representing a majority of the then outstanding
Warrants). The Warrant Agent shall be entitled to receive and, subject to
Section 9.02, shall be fully protected in relying upon, an officers' certificate
and opinion of counsel as conclusive evidence that any such amendment or
supplement is authorized or permitted hereunder, that it is not inconsistent
herewith, and that it will be valid and binding upon the Issuer in accordance
with its terms.

         10.03. Successors. All the covenants and provisions of this Agreement
by or for the benefit of the Issuer or the Warrant Agent shall bind and inure to
the benefit of their respective successors and assigns hereunder.

         10.04. Termination. This Agreement (other than any party's obligations
with respect to Warrants previously exercised and with respect to
indemnification under Section 9.02) shall terminate at 5:00 p.m., New York City
time on the Expiration Date.

         10.05. Governing Law. THIS AGREEMENT AND EACH WARRANT CERTIFICATE
ISSUED HEREUNDER SHALL BE DEEMED TO BE A CONTRACT MADE UNDER THE LAWS OF THE
STATE OF TEXAS AND FOR ALL PURPOSES SHALL BE CONSTRUED IN ACCORDANCE WITH THE
INTERNAL LAWS OF SAID STATE, WITHOUT GIVING EFFECT TO THE CONFLICT OF LAWS
PROVISIONS THEREOF.

         10.06. Benefits of This Agreement.

               (a) Nothing in this Agreement shall be construed to give to any
Person other than the Issuer, the Warrant Agent and the Holders of the Warrant
Certificates any legal or equitable right, remedy or claim under this Agreement;
but this Agreement shall be for the sole and exclusive benefit of the Issuer,
the Warrant Agent and the Holders of the Warrant Certificates.

               (b) Prior to the exercise of the Warrants, no Holder of a Warrant
Certificate, as such, shall be entitled to any rights of a stockholder of the
Issuer, including, without limitation, the right to receive dividends or
subscription rights, the right to vote, to consent, to exercise any preemptive
right, to receive any notice of meetings of stockholders for the election of
directors of the Issuer or any other matter or to receive any notice of any
proceedings of the Issuer, except as may be specifically provided for herein.
The Holders of the Warrants are not



                                       17
<PAGE>   21


entitled to share in the assets of the Issuer in the event of the liquidation,
dissolution or winding up of the Issuer's affairs.

(c) All rights of action in respect of this Agreement are vested in the Holders
of the Warrants, and any Holder of any Warrant, without the consent of the
Warrant Agent or the Holder of any other Warrant, may, on such Holder's own
behalf and for such Holder's own benefit, enforce, and may institute and
maintain any suit, action or proceeding against the Issuer suitable to enforce,
or otherwise in respect of, such Holder's rights hereunder, including the right
to exercise, exchange or surrender for purchase such Holder's Warrants in the
manner provided in this Agreement.

                  [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]






                                       18
<PAGE>   22





         IN WITNESS WHEREOF, the parties hereto have duly executed this Warrant
Agreement as of the date first above written.


                                     ISSUER:


                                     POWERBRIEF, INC.
                                     (f/k/a Integrated Orthopaedics, Inc.)


                                     By:
                                     Name:
                                     Title:



                                     WARRANT AGENT:


                                     CONTINENTAL STOCK TRANSFER & TRUST COMPANY


                                     By:
                                     Name:
                                     Title:





<PAGE>   23




                                                                         Annex 1
                                                                              to
                                                               Warrant Agreement


                          [FORM OF WARRANT CERTIFICATE]

                                     [FACE]



CUSIP NO.                                            NUMBER OF
         ------------------------                    WARRANTS:
CERTIFICATE NO.                                               ------------------
               -------------------                   NUMBER OF
                                                     SHARES OF
                                                     COMMON STOCK:
                                                                  --------------

                                SERIES A WARRANTS

                           TO PURCHASE COMMON STOCK OF

                                POWERBRIEF, INC.
                      (F/K/A INTEGRATED ORTHOPAEDICS, INC.)


         THIS IS TO CERTIFY THAT _______________ (the "Holder"), is the owner of
____ Series A Warrants (the "Warrants"), each of which represents a right to
purchase one (1) Stock Unit at the appropriate portion of the Exercise Price (as
defined below), in whole or in part, from time to time from PowerBrief, Inc.
(f/k/a Integrated Orthopaedics, Inc.), a Texas corporation (the "Issuer"), at
any time of any Business Day on and after one year after the date of the merger
of PowerBrief, Inc., a Delaware corporation, with and into the Issuer (the date
of the effective time of such merger being the "Merger Date"), other than each
period commencing one calendar day prior to the end of a fiscal quarter and
extending through the announcement of the Issuer's operating results for such
fiscal quarter, but not later than 5:00 p.m., New York City time, on the
Expiration Date (as defined below), subject to the terms and conditions
hereinbelow; provided, however, that no Holder shall be entitled to exercise
such Holder's Warrants at any time, unless, at the time of exercise, (i) a
registration statement under the Securities Act relating to the Warrant Stock
has been filed with, and declared effective by, the Commission, and no stop
order suspending the effectiveness of such registration statement has been
issued by the Commission or (ii) the issuance of Warrant Stock is permitted
pursuant to an exemption from the registration requirements of the Securities
Act. "Exercise Price" per Whole Unit, as a Whole Unit exists on the Issue Date,
shall mean 1.25 times the lesser of (i) $1.4815 and (ii) the lowest average
closing price of the Common Stock over any consecutive 20 calendar days during
the 90 calendar days after the Merger Date, provided that if the amount in
clause (ii) cannot be determined by a publication by the AMEX, or the National
Quotations Bureau LLP, the lowest average closing price for such period shall be
determined in good faith by the Board of Directors. An inverse adjustment in the
Exercise Price for a Whole Unit shall be made each time an adjustment is made in
the number of Stock Units that make up a Whole Unit pursuant to Section 6 of the
Warrant Agreement. Within 120 days after the Merger Date, the Issuer shall cause
to be filed with the Warrant Agent and shall cause to be mailed to the Holder of
this Warrant Certificate at such Holder's address appearing on the Warrant
Register by first class mail, postage prepaid a notice setting forth the
Exercise Price as determined 90 days after the Merger Date. "Expiration Date"
shall mean the fifth anniversary of the Merger Date; provided, however, that the
Issuer shall cause to be filed with the Warrant Agent and shall cause to




<PAGE>   24


be mailed the Holder of this Warrant Certificate at such Holder's address
appearing on the Warrant Register by first class mail, postage prepaid at least
ten days before the Expiration Date (but no more than 30 days before the
Expiration Date) a written notice that his Warrants are subject to this
expiration provision; provided further that if no such notice is provided as
contemplated by the immediately preceding proviso, the Expiration Date shall
mean the date which is ten days after such notice is mailed.

         This Warrant Certificate is issued under and in accordance with a
Series A Warrant Agreement dated _______________, 2001 (the "Warrant
Agreement"), between the Issuer and Continental Stock Transfer & Trust Company,
as Warrant Agent, and is subject to the Articles of Incorporation and Bylaws of
the Issuer and to the terms and provisions contained therein, all of which terms
and provisions the Holder of this Warrant Certificate consents to by acceptance
hereof. The terms of the Warrant Agreement are hereby incorporated herein by
reference and made a part hereof. Reference is hereby made to the Warrant
Agreement for a full description of the rights, limitations of rights,
obligations, duties and immunities thereunder of the Issuer and the Holders of
the Warrants. The summary of the terms of the Warrant Agreement contained in
this Warrant Certificate is qualified in its entirety by express reference to
the Warrant Agreement. All terms used in this Warrant Certificate that are
defined in the Warrant Agreement shall have the meanings assigned to them in
such agreement.

         Notwithstanding any other provision herein, except the requirement that
the Warrant Stock is registered under the Securities Act or that the issuance
thereof is exempted from the registration requirements of the Act upon a Change
of Control (as defined below), the Warrants shall immediately become
exercisable, in whole or in part, from time to time, at any time prior to the
Expiration Date. "Change of Control" is defined as (i) the acquisition by
another person or group of persons of 35% or more of the outstanding shares of
Common Stock of the Issuer, (ii) a majority change in the Board of Directors
over a twelve-month period, (iii) a merger, consolidation, or other similar
transaction with another entity in which the Issuer is not the surviving entity
or in which the Issuer's shareholders do not own a majority of the shares in the
combined entity or (iv) a sale of all or substantially all of the Issuer's
assets.

         A Warrant may be exercised upon surrender hereof at the principal
office of the Warrant Agent with the form of exercise on the reverse hereto (the
"Exercise Notice") duly completed and signed and upon payment to the Exercise
Price as adjusted as herein provided for each of share of Warrant Stock in
respect of which such Warrant is then exercised.

         This Exercise Price shall be payable (a) by Federal wire transfer to
the account designated by the Issuer or by certified or official bank check
payable to the order of the Issuer or (b) by presentment of Warrants to the
Issuer for cancellation in accordance with the following formula: in exchange
for each share of Warrant Stock issuable on exercise of each Warrant represented
by this Warrant Certificate that is being exercised, the Holder shall receive
such number of shares of Warrant Stock as is equal to the product of (i) the
number of shares of Warrant Stock issuable upon exercise of the Warrants being
exercised at such time multiplied by (ii) a fraction, the numerator of which is
the fair market value per share of Warrant Stock at such time minus the Exercise
Price per share of Warrant Stock at such time, and the denominator of which is
the fair





<PAGE>   25


market value per share of Warrant Stock at such time. The fair market value of
Warrant Stock shall be the fair market value as confirmed in writing to the
Warrant Agent by the Issuer. Upon receipt hereof, the Issuer shall, as promptly
as practicable, execute or cause to be executed and deliver or cause to be
delivered to the Holder a certificate or certificates representing the aggregate
number of shares of Warrant Stock and other securities issuable upon such
exercise and any other property to which such Holder is entitled.

         This Warrant Certificate and all rights hereunder are transferable by
the registered Holder hereof, in whole or in part, on the register of the Issuer
maintained by the Warrant Agent for such purpose at the Warrant Agent's office
in New York, New York, upon surrender of this Warrant Certificate duly endorsed,
or accompanied by a written instrument of transfer in form satisfactory to the
Issuer and the Warrant Agent duly executed, with signatures guaranteed as
specified in the attached Form of Assignment, by the registered Holder hereof or
such Holder's attorney duly authorized in writing and by such other
documentation required pursuant to the Warrant Agreement and upon payment of any
necessary transfer tax or other governmental charge imposed upon such transfer.
Upon any partial transfer, the Issuer will sign and issue and the Warrant Agent
will countersign and deliver to such Holder a new Warrant Certificate or
Certificates with respect to any portion not so transferred. Each taker and
Holder of this Warrant Certificate, by taking and holding the same, consents and
agrees that prior to the registration of transfer as provided in the Warrant
Agreement, the Issuer and the Warrant Agent may treat the Person in whose name
the Warrants are registered as the absolute owner hereof for any purpose and as
the Person entitled to exercise the rights represented hereby, any notice to the
contrary notwithstanding. Accordingly, the Issuer and/or the Warrant Agent shall
not, except as ordered by a court of competent jurisdiction as required by law,
be bound to recognize any equitable or other claim to or interest in the
Warrants on the part of any Person other than such registered Holder, whether or
not it shall have express or other notice thereof.

         This Warrant Certificate may be exchanged at the office of the Warrant
Agent maintained for such purpose in New York, New York, for Warrant
Certificates representing the same aggregate number of Warrants, each new
Warrant Certificate to represent such number of Warrants as the Holder hereof
shall designate at the time of such exchange.

         Prior to the exercise of the Warrants represented hereby, the Holder of
this Warrant Certificate, as such, shall not be entitled to any rights of a
shareholder of the Issuer, including, without limitation, the right to vote or
to consent to any action of the shareholders, to receive any distributions, to
exercise any preemptive right or to receive any notice of meetings of
shareholders, and shall not be entitled to receive any notice of any proceedings
of the Issuer except as provided in the Warrant Agreement.

         The Issuer shall not be required to issue a fractional amount of
Warrant Stock upon exercise of Warrants. As to any fraction of a share of
Warrant Stock which the Holder would otherwise be entitled to purchase upon such
exercise the Issuer shall pay a







<PAGE>   26

cash adjustment in respect of such final fraction in an amount equal to the same
fraction of the fair market value per share of Warrant Stock on the date of
exercise. The fair market value of Warrant Stock shall be the fair market value
as confirmed in writing to the Warrant Agent by the Issuer.

         This Warrant Certificate shall not be valid for any purpose until it
shall have been countersigned by the Warrant Agent.

                                     POWERBRIEF, INC.
                                     (f/k/a Integrated Orthopaedics, Inc.)



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


Dated:

Countersigned:

CONTINENTAL STOCK TRANSFER
  AND TRUST COMPANY,
as Warrant Agent



By:
   -----------------------
   Authorized Officer


<PAGE>   27


                             FORM OF EXERCISE NOTICE

                 (To be executed only upon exercise of Warrant)


To:      Continental Stock Transfer & Trust Company,
              as Warrant Agent
         2 Broadway
         New York, New York 10004
         Attention:  Compliance Department


         The undersigned irrevocably exercises _________ Warrants and herewith
makes payment of $ _________ (such payment being by Federal wire transfer to the
account designated by PowerBrief, Inc. or by certified or official bank check
payable to the order or at the direction of PowerBrief, Inc.), or exercise its
right to receive shares of Warrant Stock without payment of the Exercise Price
in cash on the terms and conditions specified in this Warrant Certificate and in
the Warrant Agreement and surrenders this Warrant Certificate and all right,
title and interest therein to and directs that the Common Stock, par value
$0.001 per share, of PowerBrief, Inc. deliverable upon the exercise of such
Warrants be registered or placed in the name and at the address specified below
and delivered thereto.



    Dated:
          -------------------


                                   --------------------------------------------
                                   (Signature of Owner)

                                   --------------------------------------------
                                   (Street Address)

                                   --------------------------------------------
                                   (City)           (State)          (Zip Code)



Securities and/or check or other property to be issued or delivered to:

Please insert social security or identifying number:
                                                    ---------------------------
Name:
     -------------------------------------------

Street Address:
               ---------------------------------

City, State and Zip Code:
                         -----------------------




<PAGE>   28




                               FORM OF ASSIGNMENT

         In consideration of monies or other valuable consideration received
from the Assignee(s) named below, the undersigned registered Holder of this
Warrant Certificate hereby sells, assigns, and transfers unto the Assignee(s)
named below (including the undersigned with respect to any Warrants constituting
a part of the Warrants evidenced by this Warrant Certificate not being assigned
hereby) all of the right of the undersigned under this Warrant Certificate, with
respect to the number of Warrants set forth below:


Name(s) of Assignee(s):
                       -------------------------

Address:
        ----------------------------------------

No. of Warrants:
                --------------------------------

Please insert social security or other identifying number of assignee(s):

and does hereby irrevocably constitute and appoint _________________________ the
undersigned's attorney to make such transfer on the books of___________________
maintained for the purposes, with full power of substitution in the premises.

Dated:
       --------------------


                                 ----------------------------------------------
                                 (Signature of Owner)

                                 ----------------------------------------------
                                 (Street Address)

                                 ----------------------------------------------
                                 (City)              (State)         (Zip Code)

                                 Signature Guaranteed By:

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

                                 Signatures must be guaranteed by an "eligible
                                 guarantor institution" meeting the requirements
                                 of the Warrant Agent, which requirements
                                 include membership or participation in the
                                 Security Transfer Agent Medallion Program
                                 ("STAMP") or such other "signature guarantee
                                 program" as may be determined by the Warrant
                                 Agent in addition to, or in substitution for,
                                 STAMP, all in accordance with the Securities
                                 Exchange Act of 1934, as amended.