<PAGE>   1
                                                                   EXHIBIT 10.13

                              STRATEGIC AGREEMENT
                              FOR MICROLAPAROSCOPY

         This Strategic Agreement for Microlaparoscopy ("Agreement") is made as
of the 1st day of January, 1997, by and between Valleylab, Inc., a Colorado
corporation ("Valleylab"), and Medical Alliance, Inc., a Texas corporation
("MAI").

                                   BACKGROUND

         Valleylab is a developer, manufacturer and distributor of, among other
things, electro-surgical systems and related surgical products. MAI is a
provider of surgical and diagnostic equipment and related services to
physicians for use in out-patient microlaparoscopy procedures (individually, a
"Procedure" and collectively, the "Procedures"). Subject to the terms and
conditions set forth below, Valleylab and MAI desire to enter into a strategic
affiliation to promote the use of certain equipment owned by Valleylab as set
forth on Exhibit A attached hereto (the "Equipment"), and certain services as
set forth on Exhibit B attached hereto (the "Services"), for use by MAI in
providing mobile surgical support services to physicians performing Procedures
within certain geographical regions set forth on Exhibit C attached hereto (the
"Districts").

         NOW, THEREFORE, in consideration of the mutual promises,
representations, warranties, covenants, and conditions set forth in this
Agreement, and intending to be legally bound hereby, the parties to this
Agreement agree as follows:

         1.      DEFINITIONS.

         For purposes of this Agreement, in addition to those terms defined in
the recitals to and elsewhere in this Agreement, the following terms shall have
the following meanings unless the context clearly otherwise requires:

                 (a)      "Certificate" shall have the meaning ascribed thereto
         in Section 7 below.

                 (b)      "Depreciated Asset Value" shall mean Valleylab's
         actual cost of an item of Equipment, net of depreciation; and shall be
         determined using the straight-line method over 36 months, with no
         residual value, in accordance with GAAP.

                 (c)      "GAAP" shall mean generally accepted accounting
         principles, applied on a consistent basis.

                 (d)      "Person" shall mean any individual, sole
         proprietorship, joint venture, partnership, corporation, association,
         joint-stock company, unincorporated organization, cooperative, trust,
         estate, or any other entity of any kind or nature whatsoever.

                 (e)      "Transfer Invoice Price" shall mean the published
         retail list price for a piece of Equipment as in effect as of the date
         the Equipment was placed in service by MAI. For current Equipment, the
         Transfer Invoice Price for each piece of such Equipment is set forth
         opposite each item of Equipment on Exhibit A.
<PAGE>   2
2.       EQUIPMENT; SERVICES; EXCLUSIVITY; OPERATIONAL PHASES

         (a)     Equipment; Services. Valleylab hereby agrees to provide to
MAI, and MAI hereby agrees to accept from Valleylab, the Equipment, in the
quantities set forth thereon and on the terms and conditions set forth herein.
In addition, Valleylab hereby agrees to provide to MAI, throughout the Term (as
defined below) technical, educational, instructional and other Services set
forth on Exhibit B relating to the Equipment and the use of Equipment in the
Procedures. Upon execution of this Agreement, Valleylab and MAI shall mutually
agree upon when the Equipment shall be shipped and delivered. All Equipment
delivered to MAI pursuant to this Section 2(a) shall be delivered F.O.B. MAI's
facility. MAI agrees that during the Term, it shall provide Valleylab with
calendar quarterly forecasts showing its rolling 12-month forecast for any
needed additional equipment which the parties may agree to add to the Equipment
in accordance with the provisions of Section 14(c) below.

         (b)     Exclusivity. MAI agrees that it will obtain all of its
microlaparoscopy equipment and instruments for providing mobile surgical
support services in connection with Procedures performed within the Districts
from Valleylab under the terms of this Agreement; provided however, that MAI
may seek to obtain such equipment and instruments to the extent that Valleylab
is unwilling or unable to amend the list of Equipment upon written request of
MAI in order to reasonably meet the needs of MAI in providing such services.
Valleylab agrees that it will not supply any of the items of Equipment or any
other microlaparoscopy equipment and instruments to any Person (other than MAI)
providing microlaparoscopic mobile surgical support services within the
Districts.

         (c)     Operational Phases. MAI agrees to begin offering the use of
the Equipment and related support services for Procedures to be performed in
the Districts according to the following timetable:

                 (i)    Beginning in February 1997, in three Districts;

                 (ii)   Beginning in June 1997, in four additional Districts
         (for a cumulative total of seven Districts); and

                 (iii)  Beginning in September 1997, in three additional
         Districts (for a cumulative total of ten Districts).

3.       TERM; TERMINATION

         (a)     Term. Except as otherwise provided in (b) below or Section 13
below, the term of this Agreement (the "Term") shall commence as of January 1,
1997, and shall remain in effect for an initial term ending December 31, 1997,
which term may be extended for one or more additional years by written
agreement of the parties. Except if previously terminated pursuant to (b) below
or Section 13 below, at least ninety (90) days before the end of the Term,
either party may propose extending the Agreement for





                                       2
<PAGE>   3
another year by giving the other party written notice of such desire, in which
event the parties agree to negotiate toward such extension in good faith.
Nothing in this Section 3(a) shall require the parties to mutually agree on any
extension of the Term. In addition, except if previously terminated pursuant to
(b) below or Section 13 below, no later than October 1997, both parties will
evaluate whether this Agreement meets their expectations and business needs,
and if not, will attempt in good faith to revise the terms or propose new terms
so that it better reflects the parties mutual objectives.

         (b)     Early Termination.

                 (i)      Notwithstanding (a) above, subject to the provisions
         set forth below, either party may terminate this Agreement without
         cause at any time by giving the other party at least ninety (90) days
         prior written notice of such termination:

                          (A)     In the event Valleylab desires to terminate
                 this Agreement, MAI shall, at MAI's election, either (i)
                 return to Valleylab all Equipment, with all costs associated
                 with such return (including but not limited to freight,
                 carriage and insurance) to be paid by Valleylab, or (ii)
                 purchase and take title to all Equipment at a price equal to
                 the Depreciated Asset Value thereof. MAI shall provide
                 Valleylab written notice at least fifteen (15) days prior to
                 the expiration of the above-referenced ninety (90) day period
                 informing Valleylab of its election hereunder.

                          (B)     In the event MAI desires to terminate this
                 Agreement, Valleylab shall, at Valleylab's election, either
                 (i) obtain return of all Equipment, with all costs associated
                 with such return (including but not limited to freight,
                 carriage and insurance) to be paid by MAI, and payment by MAI
                 to Valleylab of an amount equal to the difference between the
                 Depreciated Asset Value of such Equipment and Valleylab's
                 original cost thereof or (ii) require MAI hereunder to
                 purchase and take title to the Equipment at the aggregate
                 Transfer Invoice Prices for such Equipment. Valleylab shall
                 provide MAI written notice at least fifteen (15) days prior to
                 the expiration of the above-referenced ninety (90) day period
                 informing MAI of its election hereunder.

                 (ii)     In the event that Valleylab and MAI mutually agree to
         terminate this Agreement pursuant to this subsection (b), MAI shall
         either (a) return to Valleylab all (or any part) of the Equipment,
         with all costs associated with such return (including but not limited
         to freight, carriage and insurance) to be paid equally by Valleylab
         and MAI, or (b) purchase and take title to all (or, if some Equipment
         are returned to Valleylab pursuant to the preceding clause, the
         remainder) of the Equipment at a purchase price equal to the lessor of
         (1)1.6 times the aggregate Depreciated Asset Value of such purchased
         Equipment or (2) the aggregate Transfer Invoice Prices for such
         Equipment less twenty percent (20%) of such amount.





                                       3
<PAGE>   4
                 (iii)    In the event that either party desires to terminate
         this Agreement upon the default by the other party pursuant to Section
         13 below, the provisions of Section 13 shall apply.

         (c)     Rights and Obligations Upon Termination. Upon the termination
of this Agreement for any reason, any and all Fees due to Valleylab shall be
immediately due and payable as of the date of such termination, and all other
obligations of the parties incurred through the effective date of such
termination will be fulfilled by the parties fully in accordance with the terms
and conditions of this Agreement notwithstanding termination hereof.

4.       FEE; PAYMENT TERMS.

         (a)     Fee. MAI agrees that for Valleylab's agreement to provide the
Equipment and Services and its other obligations hereunder, MAI shall pay
Valleylab a fee (the "Fee") equal to a percentage of the total amount collected
by MAI for each Procedure in which the Equipment is used. The initial Fee shall
be equal to fifteen percent (15%) of such total amount collected by MAI, which
number shall be subject to review and, to the extent mutually agreed upon in
writing by the parties, subject to adjustment, based upon good faith
discussions of the parties to occur (i) every four months during the Term and
(ii) whenever it is proposed that the Equipment be used in new procedures or
that changes be made to the equipment and instruments comprising the Equipment
such that such usage or changes could reasonably be expected to have a material
affect on the revenues attributable to the Equipment and Services. Such review
and negotiations shall be based on the parties intent to maintain the
relationship between the parties relative economic burden and return in
connection with this Agreement, and shall be based on relevant information
regarding MAI's operations and the Procedures, including without limitation,
the number of Procedures in which the Equipment is used, the gross
reimbursement rates to MAI for such Procedures, the aging of MAI's receivables
relating to the Procedures and MAI's net realization rates thereon, the
parties' relative costs and other relevant financial measures. The first
scheduled review shall begin in May 1997. The Fee in effect at any given time,
and from time to time, shall be set forth on Exhibit D attached hereto, as the
same may be amended and signed by both parties from time to time by mutual
written agreement of the parties.

         (b)     Payment Terms. Fee payments shall be made within thirty (30)
days of the close of each calendar month and shall cover collected fees through
the last day of such month (i.e. the month immediately preceding the month when
payment is due). If any scheduled date for payment shall be a Saturday, Sunday
or legal holiday in Boulder, Colorado, or Dallas, Texas, payment shall be due
on the next business day following the date when payment would otherwise be
due.

         (c)     Reports; Audits. MAI shall submit a report with each Fee
payment setting forth with reasonable particularity (i) the number of
Procedures performed during such month and the amount accrued by MAI as its
expected receipts from such Procedures; (ii) the amount received by MAI during
such month relating to Procedures (whether





                                       4
<PAGE>   5
performed during such month or previously); (iii) the calculation of the Fee as
a percentage of item (ii) above; and (iv) a reconciliation of any differences
between the amounts set forth in (i) and (ii) above. Upon request by Valleylab,
MAI shall allow Valleylab and its employees and advisors reasonable access to
MAI's facilities no more than four (4) times per year, on a quarterly basis,
during normal working hours and upon reasonable notice for the purpose of
auditing the financial books and records of MAI relating to the utilization of
the Equipment in order to enable Valleylab to verify the calculation and
payment of the Fee in accordance with this Section.

         (d)     Place of Payment. All payments required to Valleylab under
this Agreement shall be made to Valleylab (or any successor of assignee of
Valleylab pursuant to Section 14(a)) at the address provided in writing by
Valleylab to MAI from time to time.

         (e)     Third Party Arrangements. MAI shall be solely responsible for
all arrangements, which arrangements shall comply with all applicable federal
and state rules and regulations, with physicians and third party providers
pursuant to which Procedures may be performed. MAI shall be solely responsible
for billing and collection under such arrangements.

5.       PROCEDURES, MARKETING, RECORDKEEPING: OUTCOME INFORMATION AND STUDIES.

         (a)     Procedures. MAI shall be responsible for defining each
Procedure in terms of (i) the specific procedure to be performed by the
physician and (ii) the equipment, services and other resources to be provided
by MAI to the physician and others involved in the Procedure. Such definition
shall include the procedural specifications, protocols, credentialing standards
and clinical guidelines (collectively, "Standards") to be offered by MAI, or
which MAI will require to be observed, in the course of any Procedure. The
Standards shall be in conformity with all applicable laws and regulations and
good clinical practice, and before being implemented shall be approved by MAI's
Medical Director. MAI shall establish and maintain quality assurance systems
for the Standards. MAI shall support its services relating to the Procedures
with reasonable infrastructure and personnel, including technicians, sales
personnel, sales and marketing, billing, collection, clinical business
development and administrative support.

         (b)     Marketing. MAI shall market and sell its services in
connection with the Procedures with reasonable diligence and on reasonable
business terms, within the Districts, and in any additional Districts to which
this Agreement may become applicable. Except as otherwise provided herein, MAI
shall be solely responsible for preparing any and all sales, marketing and
promotional material relating to the Procedures. Such responsibility shall
extend to the content, format, method of distribution, and the costs of
preparing, producing and disseminating such materials. Upon written request of
MAI, Valleylab will, at Valleylab's cost and expense, include in such
promotional materials, materials relating to the Equipment or Services as
reasonably requested by MAI. MAI





                                       5
<PAGE>   6
agrees that it will develop training courses for physicians and other health
care professionals relating to the Procedures and the Standards, and will
schedule, promote, organize and sponsor such courses.

            (c)     Recordkeeping: Outcome Information and Studies.

                 (i)      Recordkeeping. MAI will establish and maintain
         recordkeeping systems in accordance with applicable laws, regulations
         and other requirements for its business. Insofar as such recordkeeping
         systems relate to the Equipment and/or the Procedures in which it is
         used, Valleylab may suggest to MAI ways to refine or enhance such
         recordkeeping systems; it being within the sole discretion of MAI on
         whether or not to accept or implement such suggestions.

                 (ii)     Outcome Information and Studies. Both parties shall
         have full and equal access and rights to use clinical and economic
         outcomes, utilization, conversion and related information arising from
         Procedures performed using the Equipment. In addition, if either party
         identifies an opportunity for the creation, collection or sponsorship
         of information relevant to microlaparoscopy but outside the scope of
         the foregoing (e.g. externally developed outcome studies), then it
         shall offer the other party the opportunity to participate in
         developing such information through financial sponsorship or other
         appropriate means as may be reasonable. If the other party declines
         such offer, then the originating party need not make available to the
         other party any information resulting from such opportunity. If both
         parties participate, they shall share rights in the resulting
         information as agreed to in writing by the parties.

         (d)     Services and Marketing Plan and Budget. No later than February
28, 1997, the parties will develop a plan for marketing microlaparoscopy during
the Term (the "Plan") and a budget (the "Budget") for their respective
contributions of resources to implement the Plan. Such Plan and Budget shall be
subject to review and adjustment, if agreed, pursuant to the process specified
in Section 4(a) above.

6.       TAXES: INDEMNITY.

         (a)     Taxes Assessments. Each party shall pay, promptly when due,
all license fees and assessments, and all sales, use, property, excise and
other taxes or charges (including any interest and penalties), now or hereafter
imposed by any governmental body or agency upon such party as relates to the
ownership and operation of the Equipment and the rights and obligations of the
parties hereunder. If MAI purchases any Equipment, and sales tax is due
thereon, MAI agrees to pay such sales tax. MAI also agrees to prepare and file
promptly with the appropriate offices any and all tax and other similar returns
required to be filed with respect thereto (sending copies thereof to Valleylab)
or, if requested by Valleylab, notify Valleylab of such requirement and furnish
Valleylab with all information required by Valleylab so that it may effect such
filing.





                                       6
<PAGE>   7
                 (b)      Indemnification by MAI. MAI agrees to and shall
         indemnify and save Valleylab, its affiliates, directors, officers,
         employees, agents, successors and assigns harmless from and against,
         and to defend them against, any and all liabilities, damages, losses
         and expenses (including reasonable attorney's fees and expenses of
         litigation), incurred by or imposed upon them or any one of them in
         connection with any claims, suits, actions, demands or judgments
         arising out of any reckless or negligent act or willful misconduct of
         MAI or any of its employees or agents.

                 (c)      Indemnification by Valleylab. Valleylab agrees to and
         shall indemnify and save MAI, its affiliates, directors, officers,
         employees, agents, successors and assigns harmless from and against,
         and to defend them against, and any and all liabilities, damages,
         losses and expenses (including reasonable attorney's fees and expenses
         of litigation), incurred by or imposed upon them or any one of them in
         connection with any claims, suits, actions, demands or judgments
         arising out of any reckless or negligent act or willful misconduct of
         Valleylab or any of its employees or agents; provided, however, that
         this indemnification shall not apply to any liability, damage, loss or
         expense which arises out of an illness or injury attributable to the
         reckless or negligent acts or willful misconduct of MAI, its employees
         or agents. Notwithstanding anything stated herein to the contrary,
         Valleylab shall not have any liability under this subsection if (1)
         MAI failed to properly inspect and test any Equipment prior to such
         Procedure or (2) MAI failed to give Valleylab prompt written notice of
         the need for maintenance of Equipment in accordance with Section 10(d)
         below, and such maintenance would have prevented such illness or
         injury.

                 (d)      Indemnification Notice; Survival. Any party seeking
         indemnification pursuant to this Section 6 shall promptly notify the
         other party of any claim or suit for which indemnification is being
         sought and shall fully cooperate with the indemnifying party in
         handling any such claim. The obligations and rights of the parties
         contained in this Section 6 shall survive the termination of this
         Agreement.

         7.      ACCEPTANCE. Promptly after delivery of the Equipment to MAI,
and in any event within fourteen (14) days of receipt thereof, MAI shall
inspect the Equipment and (a) if fully satisfied therewith, execute and deliver
to Valleylab a "Certificate of Acceptance", the form of which is attached
hereto as Exhibit E (the "Certificate") or (b) notify Valleylab in writing of
the unacceptability of any Equipment, setting forth with reasonable
particularity the reasons for such unacceptability. No claim for any defect
then existing and discoverable upon inspection shall be allowed unless made in
writing to Valleylab within the above fourteen (14) day period. Any
notification that any item of Equipment is unacceptable shall not be construed
to mean that any other item of Equipment is unacceptable, unless Valleylab is
so notified in writing. On every Certificate, Valleylab shall reference (1) the
asset value initially attributable to the subject Equipment, (2) the "Transfer
Invoice Price" and (3) the best available identification information (serial
number, if possible) of the subject Equipment.





                                       7
<PAGE>   8
8.       TREATMENT OF EQUIPMENT AND INSURANCE: RISK OF LOSS.

         (a)     Treatment of Equipment; Insurance. MAI shall clean, sterilize,
maintain and calibrate each item of Equipment according to the requirements or
recommendations of its maker and any additional requirements reasonably imposed
by Valleylab, which requirements shall be furnished in writing to MAI prior to
delivery of the Equipment. MAI shall treat the Equipment in the same way it
treats its own equipment for purposes of insurance, physical security, and
asset or inventory control.

         (b)     Risk of Loss. Except as otherwise provided herein, the
Equipment, until returned to Valleylab, shall be held at all times at the sole
risk of MAI for injury, damage (including damage to third parties and their
property), loss, destruction, theft, expropriation or requisition (as to either
title or use). If any Equipment is destroyed, lost, stolen, damaged beyond
repair, or permanently rendered unfit for normal use for any reason whatsoever,
MAI shall promptly notify Valleylab in writing and in such notice shall state
which item(s) of Equipment require(s) replacement and the reasons therefor.
Valleylab shall supply MAI the replacement Equipment, F.O.B. Valleylab's
facility, at a price equal to Valleylab's actual cost therefor (determined
immediately prior to such occurrence and otherwise in accordance with
Valleylab's normal accounting procedures) plus an additional ten percent (10%)
of such cost, which amounts MAI shall pay Valleylab upon invoice thereof. Upon
such replacement, however, Valleylab shall continue to supply the subject
Equipment at the scheduled Fee in effect at the time of the event necessitating
the replacement.

9.       TITLE.

         (a)     Title. Unless MAI purchases any Equipment from Valleylab
pursuant to Section 3(b) above or otherwise pursuant to the terms of this
Agreement, (i) the ownership of the Equipment is and at all times shall remain
in Valleylab, (ii) the Equipment are and shall remain personal property and
shall not be attached to or become part of any realty, and (iii) MAI will not
sell, secrete, mortgage, assign, transfer, lease, sublet, loan, part with
possession of, or encumber the Equipment or permit any liens or charges to
become effective thereon or permit or attempt to do any of the acts aforesaid,
except that MAI may transport and set up such Equipment in physicians' offices,
hospitals and clinics for the purpose of allowing physicians to utilize the
Equipment for Procedures, demonstrations and training. MAI agrees, at MAI's own
expense, to take such action as may be necessary (1) to remove any such
encumbrance, lien or charge, and (2) to prevent any third party from acquiring
any other interest in any Equipment (including, without limitation, by reason
of such Equipment being deemed to be a fixture or a part of any realty).

         (b)     Ownership Logo. MAI acknowledges that Valleylab may, at
Valleylab's expense, affix and maintain on the Equipment a plate indicating
Valleylab's ownership thereof for the purpose of, among other things, noticing
MAI's creditors.





                                       8
<PAGE>   9
10.      LIMITED WARRANTY; LIMITATION OF REMEDIES; MAINTENANCE.

         (a)     Limited Warranty. Valleylab makes no warranty, express or
implied, with respect to the Equipment except as set forth in this Section 10.
Valleylab warrants from the date of any Certificate, according to specific
product warranties and time limitations as contained in the applicable users'
manual, that the subject Equipment shall be free from defects in material and
workmanship when properly maintained, handled and used for the intended
purpose. This warranty applies only to MAI and its assigns. The above warranty
covers only Warranty Equipment (as defined below) and, for such equipment,
excludes Non-Warranty Events (as defined below). "Warranty Equipment" means
each item of Equipment except (i) any item of Equipment which is not made by
Valleylab (as to which, any warranty will be governed by Section 10(e) (iii)
below) and (ii) any item of Equipment designated as an "Instrument" on Exhibit
A. A "Non-Warranty Event" means any damage caused by any of the following: (1)
use or installation other than in strict accordance with the manufacturer's
written instructions; (2) disassembly or repair by an unauthorized person; (3)
misuse, misapplication or abuse; (4) alteration; (5) lack of reasonable care;
or (6) wind, ice, snow, rain, lightning or other weather conditions or acts of
God. If a Non-Warranty Event occurs to any item of Warranty Equipment, the
warranty in this Section 10(a) shall no longer apply to such item of Equipment
unless and until MAI, in Valleylab's reasonable judgment, has satisfactorily
repaired such damage. If MAI does so before the expiration of the original
warranty term for such item of Equipment, such original warranty shall be
reinstated for the balance of such term.

         (b)     Disclaimer of Implied Warranties. OTHER THAN THE WARRANTIES
SET FORTH ABOVE, VALLEYLAB MAKES NO OTHER WARRANTIES OR REPRESENTATIONS OF ANY
KIND, WHETHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO IMPLIED
WARRANTIES OF FITNESS FOR A PARTICULAR PURPOSE, MERCHANTABILITY OR AS TO ANY
OTHER MATTER. THE EXPRESS WARRANTIES CONTAINED HEREIN SUPERSEDE ANY AND ALL
ORAL OR WRITTEN WARRANTIES OR REPRESENTATIONS MADE OR IMPLIED BY VALLEYLAB OR
ANY OF VALLEYLAB'S EMPLOYEES OR REPRESENTATIVES OR IN ANY OF VALLEYLAB'S
BROCHURES, MANUALS, CATALOGUES, LITERATURE OR OTHER MATERIALS.

         (c)     Limitation of Remedy. EXCEPT AS OTHERWISE PROVIDED IN THIS
AGREEMENT, AND EXCEPT FOR ACTIONS INSTITUTED BY THIRD PERSONS AGAINST MAI,
MAI'S SOLE AND EXCLUSIVE REMEDY AND VALLEYLAB'S SOLE OBLIGATION FOR ANY BREACH
OF THE EXPRESS WARRANTIES CONTAINED HEREIN SHALL BE LIMITED TO THE REPAIR OR
REPLACEMENT OF THE DEFECTIVE EQUIPMENT, AS VALLEYLAB IN ITS SOLE DISCRETION
SHALL DETERMINE (WITH A NEW OR FACTORY RECONDITIONED PRODUCT, AS VALLEYLAB MAY
DETERMINE). VALLEYLAB RESERVES THE RIGHT TO MAKE AN EXAMINATION AND MAKE THE
NECESSARY REPAIR OR REPLACEMENT IN ITS OWN FACTORY, AT ANY AUTHORIZED REPAIR
STATION, OR AT MAI'S PLACE OF BUSINESS. TO OBTAIN SERVICE UNDER





                                       9
<PAGE>   10
THIS WARRANTY, MAI MUST FOLLOW ALL APPLICABLE PROCEDURES FOR RETURN OF
EQUIPMENT AS SET FORTH HEREIN. EXCEPT AS OTHERWISE PROVIDED IN THIS AGREEMENT
AND EXCEPT WITH RESPECT TO ACTIONS INSTITUTED BY THIRD PERSONS, VALLEYLAB SHALL
IN NO EVENT AND UNDER NO CIRCUMSTANCES BE LIABLE OR RESPONSIBLE FOR ANY
CONSEQUENTIAL, INDIRECT, INCIDENTAL, PUNITIVE, DIRECT OR SPECIAL DAMAGES BASED
UPON BREACH OF WARRANTY, BREACH OF CONTRACT, NEGLIGENCE, OR OTHERWISE OR ANY
OTHER LEGAL THEORY ARISING DIRECTLY OR INDIRECTLY FROM THE SALE, USE, OR
FAILURE OF ANY EQUIPMENT (INCLUDING BUT NOT LIMITED TO LOSS OF INCOME, LOSS OF
TIME, LOSS OF SALES, OR INJURY TO PERSONAL PROPERTY).

         (d)     Maintenance. During the Term, provided that (1) the Equipment
is not being subject to misuse, mishandling or modification and are being used
for their intended purpose according to applicable instructions pursuant to
this Agreement, and (2) MAI provides Valleylab with notice of the need for
maintenance of any Equipment within two (2) business days after the occurrence
of any malfunction, Valleylab shall at its own cost and expense, including
shipping (i) maintain the Equipment in good working order and condition and
(ii) at Valleylab's sole election, repair or replace any component or
components of any Equipment that may require repair or replacement from time to
time to the extent necessary to maintain, preserve and keep the Equipment in
good working order and condition. In order to satisfy its maintenance
obligations hereunder, Valleylab must either (i) perform maintenance with
respect to any Equipment in need of repair or (ii) provide MAI temporarily with
adequate loaner equipment within seventy-two (72) hours after Valleylab has
received notice that maintenance is required. If, however, MAI discovers that
any Equipment requires repair or replacement due to breakage which occurs as a
result of misuse, mishandling or modification, MAI shall promptly notify
Valleylab in writing of such occurrence (before any return of any Equipment to
Valleylab for repair or replacement), and MAI shall be fully responsible for
the repair or replacement of such Equipment, at MAI's sole cost and expense, as
provided in subsection (e) below. Notwithstanding anything stated in this
Section 10(d) to the contrary, Valleylab shall not be responsible for
maintaining any Equipment once it is acquired by MAI pursuant to this
Agreement, and the time period applicable to the warranty set forth in
subsection (a) above shall be deemed to have commenced as of the date the
Certificate for such Equipment was executed by MAI.

         (e)     Repairs/Replacements Not Covered by Valleylab's Warranty or
Maintenance Obligations.

                 (i)      If any Equipment requires repair that is not covered
         by Valleylab's warranty or maintenance obligations as set forth in
         this Section 10, MAI shall have the option of either (a) engaging
         Valleylab to repair the Equipment at a charge equal to Valleylab's
         cost of parts (determined immediately prior to the repair and
         otherwise in accordance with Valleylab's normal accounting procedures)
         plus $100 per hour for labor, which amounts MAI shall pay Valleylab
         within thirty (30) days after invoice by Valleylab or (b) engaging a





                                       10
<PAGE>   11
         qualified third party to repair the item at MAI's sole cost and
         expense; provided, however, that if Valleylab's prior written
         authorization as to such third party's engagement is not obtained
         (which authorization shall not be unreasonably withheld), Valleylab
         shall have no obligation to continue to maintain the Equipment
         requiring repair, as otherwise would be required by this Section
         10(e).  Before returning any Equipment to Valleylab for repair or
         engaging the third party to conduct the repair, as the case may be,
         MAI shall give prior written notice of such election to Valleylab.
         Upon such repair, however, Valleylab shall continue to supply the
         subject Equipment at the scheduled Fee rate in effect at the time of
         the event necessitating the repair.

                 (ii)     If any Equipment requires replacement that is not
         covered by Valleylab's warranty or maintenance obligations as set
         forth in this Section 10, Valleylab shall supply MAI the replacement
         Equipment, F.O.B. Valleylab's facility, at a charge equal to
         Valleylab's actual cost therefor (determined immediately prior to such
         occurrence and otherwise in accordance with Valleylab's normal
         accounting procedures) plus an additional ten percent (10%) of such
         cost, which amounts MAI shall pay Valleylab within thirty (30) days
         after invoice by Valleylab. Upon such replacement, however, Valleylab
         shall continue to supply the subject Equipment at the scheduled Fee
         rate in effect at the time of the event necessitating the replacement.

                 (iii) Valleylab may, from time to time and at its option,
         obtain items of Equipment to be provided to MAI under this Agreement
         from third parties. Valleylab shall have no warranty obligation to MAI
         respecting such items of Equipment, but shall use reasonable efforts
         to provide MAI with the benefit of any warranties offered by the maker
         of such items of equipment. However, Valleylab shall maintain and
         repair/replace all such Equipment according to this Section 10.

                 (iv) In returning any item of Equipment, whether or not under
         warranty and whether or not for repair, inspection, calibration,
         replacement or other action, MAI shall follow Valleylab's established
         procedures governing such return, including without limitation,
         procedures governing the issuance of return authorization numbers, the
         address to which such item is to be shipped, and the manner in which
         it is to be decontaminated and/or cleaned, packed, shipped and insured
         provided that Valleylab has adequately notified MAI of such
         procedures.

         11.     ACCESSIONS; INSPECTION; ALTERATIONS. All replacements or
substitutions of parts, of or in any of the Equipment, shall constitute
accessions thereto and shall become part of the Equipment owned by Valleylab;
provided, however, that MAI may add components to the Equipment if such act
would not cause material damage (as defined below) to the Equipment during use
(which additions shall not void the warranties provided herein). Any components
added by MAI to the Equipment shall remain the property of MAI and may be
removed by MAI upon the termination of this Agreement if (a) MAI removes such
components, at MAI's sole cost and expense, at the end of the applicable Term
and (b) such





                                       11
<PAGE>   12
removal can be effected without causing material damage (as defined below) to
the Equipment. The term "material damage" as used in the preceding sentence
shall mean damage the nature of which has a measurable effect on the economic
value or resaleability of the Equipment in question. Upon reasonable notice from
Valleylab and during regular business hours, MAI will permit Valleylab to have
access to MAI records relating to the maintenance of the Equipment for the
purpose of inspection and examination.

         12.     USE OF EQUIPMENT; COMPLIANCE WITH LAWS AND REGULATORY
STANDARDS. MAI shall be entitled to the right to exclusive possession and
control of the Equipment and the use thereof during the Term so long as
Valleylab has not exercised any rights to regain possession and control of the
Equipment as provided herein. Both parties shall comply with all present and
future applicable federal, state and local laws, regulations and ordinances
applicable to the physical possession, operation, condition, use and
maintenance of the Equipment, including but not limited to any and all
applicable regulations of the Joint Commission on Accreditation of Hospitals
(JCAH) (including but not limited to regulations applicable to the maintenance
of medical equipment). MAI agrees to obtain all permits and licenses necessary
for the operation of the Equipment, and to establish and maintain all third
party payor and reimbursement contract standards. MAI will establish and
maintain required reporting programs respecting the Equipment, and will timely
provide Valleylab with all information necessary or reasonably requested by
Valleylab to permit Valleylab to meet its regulatory obligations and quality
assurance requirements.

         13.     EVENTS OF DEFAULT; REMEDIES; EXPENSES.

                 (a)      Default by MAI. In the event that:

                          (i)     MAI shall default in the payment of any
                 installment of any Fee or other sum payable hereunder when
                 due, and such default is not cured within thirty (30) days
                 after written notice from Valleylab to MAI;

                          (ii)    MAI shall default in the observance or
                 performance of any other material covenant or agreement in
                 this Agreement, and such default shall continue for a period
                 of thirty (30) days (unless another period is specified
                 herein) after written notice from Valleylab to MAI;

                          (iii) MAI shall dissolve or become insolvent (however
                 evidenced) or bankrupt, commit any act of bankruptcy, make an
                 assignment for the benefit of creditors, suspend the
                 transaction of its usual business or consent to the
                 appointment of a trustee or receiver, or a trustee or a
                 receiver shall be appointed for MAI or for a substantial part
                 of its property, or bankruptcy, reorganization, insolvency, or
                 similar proceedings shall be instituted by or against MAI; or

                          (iv) an order, judgment, or decree shall be entered
                 against MAI by a court of competent jurisdiction and such
                 order, judgment or decree shall continue unpaid or unsatisfied
                 and in effect for any period of sixty (60) consecutive days
                 without a stay of execution, or any execution or writ of
                 process shall be issued





                                       12
<PAGE>   13
                 in connection with any action or proceeding against MAI or its
                 property whereby the Equipment or any substantial part of
                 MAI's property may be taken or restrained:

         then, and in any such event, Valleylab may, by written notice
         ("Valleylab Termination Notice") to MAI (to the extent legally
         permitted to do so), do the following:

                                  (I)      at Valleylab's option, immediately
                          terminate this Agreement (in whole as to all
                          Equipment or in part as to only a portion of the
                          Equipment), and MAI's rights hereunder with respect
                          thereto, in which event Valleylab shall (unless
                          prohibited by applicable law or court order), at
                          Valleylab's election, either (i) obtain return of all
                          Equipment, with all costs associated with such return
                          (including but not limited to freight, carriage and
                          insurance) to be paid by MAI, and receive from MAI,
                          immediately upon demand, payment for the Equipment at
                          a price equal to difference between the Depreciated
                          Asset Value of such Equipment and Valleylab's
                          original cost thereof or (ii) require MAI to purchase
                          and take title to the Equipment at the aggregate
                          Transfer Invoice Prices for such Equipment.
                          Valleylab shall inform MAI of its election hereunder
                          in the Valleylab Termination Notice, and MAI shall
                          have fifteen (15) business days within which to
                          perform pursuant to such election; and

                                  (II)     declare immediately due and payable
                          all Fees and other sums due and payable up and until
                          the date of determination;

                 provided, however, that if MAI does not comply with the
                 provisions of Subsections 13(a)(I) and (II) above, Valleylab
                 may (to the extent legally permitted to do so) do the
                 following:

                                  (1)      proceed by appropriate court action
                          or actions either at law or in equity, to enforce
                          performance by MAI of the applicable covenants of
                          this Agreement or to recover damages for the breach
                          thereof; and/or

                                  (2)      without necessity of process or
                          other legal action, enter onto the premises of MAI or
                          such other premises as the Equipment may then be
                          located and take possession of the Equipment.

         (b)     Cumulative Valleylab Remedies. In addition, MAI shall continue
to be liable for all indemnities and all reasonable legal fees and other costs
and expenses resulting from the foregoing defaults or the exercise and
enforcement of Valleylab's remedies hereunder, including placing any Equipment
in good working order and condition. No remedy referred to in subsection (a)
above is intended to be exclusive but each shall be cumulative and in addition
to any other remedy referred to above or otherwise available to Valleylab at
law or in Equity.





                                       13
<PAGE>   14
         (c)     Default by Valleylab. In the event that:

                 (i)      Valleylab shall default in the observance or
         performance of a material covenant or agreement in this Agreement and
         such default shall continue for a period of thirty (30) days (unless
         another period is specified herein) after written notice from MAI to
         Valleylab;

                 (ii)     Valleylab shall dissolve or become insolvent (however
         evidenced) or bankrupt, commit any act of bankruptcy, make an
         assignment for the benefit of creditors, suspend the transaction of
         its usual business or consent to the appointment of a trustee or
         receiver, or a trustee or a receiver shall be appointed for Valleylab
         or for a substantial part of its property, or bankruptcy,
         reorganization, insolvency, or similar proceedings shall be instituted
         by or against Valleylab; or

                 (iii)    an order, judgment, or decree shall be entered against
         Valleylab by a court of competent jurisdiction and such order, judgment
         or decree shall continue unpaid or unsatisfied and in effect for any
         period of sixty (60) consecutive days without a stay of execution, or
         any execution or writ of process shall be issued in connection with any
         action or proceeding against Valleylab or its property whereby the
         Equipment or any substantial part of Valleylab's property may be taken
         or restrained;

then, and in any such event, MAI may, by written notice ("MAI Termination
Notice") to Valleylab (to the extent legally permitted to do so), at MAI's
option, immediately terminate this Agreement (in whole as to all Equipment or
in part as to only a portion of the Equipment), and Valleylab's rights
hereunder with respect thereto, in which event MAI shall (unless prohibited by
applicable law or court order), at MAI's election, either (i) return to
Valleylab the Equipment, with all costs associated with such return (including
but not limited to freight, carriage and insurance) to be paid by Valleylab, or
(ii) purchase and take title to the Equipment at a price equal to the
Depreciated Asset Value thereof. MAI shall inform Valleylab of its election
hereunder in the MAI Termination Notice, and Valleylab shall have fifteen (15)
business days within which to perform pursuant to such election. If Valleylab
does not comply with the provisions of this Subsection 13(c), MAI may (to the
extent legally permitted to do so) proceed by appropriate court action or
actions either at law or in equity, to enforce performance by Valleylab of the
applicable covenants of this Agreement or to recover damages for the breach
thereof.

         (d)     Cumulative MAI Remedies. In addition, Valleylab shall continue
to be liable for all indemnities and all reasonable legal fees and other costs
and expenses resulting from the foregoing defaults or the exercise and
enforcement of MAI's remedies hereunder. No remedy referred to in subsection
(c) above is intended to be exclusive but each shall be cumulative and in
addition to any other remedy referred to above or otherwise available to MAI at
law or in equity.





                                       14
<PAGE>   15
14.      MISCELLANEOUS

         (a)     Assignment. MAI shall not assign (including by operation of
law) this Agreement or any interest herein, or sublease any Equipment, or part
with possession of any Equipment, without the prior written consent of
Valleylab, which consent shall not be unreasonably withheld. Valleylab shall
not assign (including by operation of law) this Agreement or any interest
herein without the prior written consent of MAI. Any permitted assignee shall
have all the rights, powers, privileges, and remedies of the assigning party
hereunder.

         (b)     Return of Equipment. If at any time pursuant to the provisions
of this Agreement, MAI is required or elects to return any Equipment or item
thereof to Valleylab (whether for return, replacement or repair), MAI shall
crate the Equipment to Valleylab in a proper manner, adequately protected for
shipment. Unless Equipment is being returned to Valleylab specifically for
repair or replacement purposes, the Equipment shall be in good operating
condition.

         (c)     Amendments: New Procedures and Technology; Entire Agreement.
This Agreement may not be altered, amended, changed, or terminated without a
written agreement signed by authorized officers of Valleylab and MAI. Without
in any way limiting the generality of the foregoing, the parties may, from time
to time, amend the items or quantities of the Equipment, the Services, the
Limited Life Components, the geographic regions included in the Districts, or
the Fee, in each case as will be more fully set forth on one or more additions
to the Exhibits attached hereto, to be signed by both parties from time to time
during the Term, all upon the terms and conditions set forth herein, such
signed addition to constitute a valid amendment to such Exhibits. Valleylab may
substitute, for any item of the Equipment, equivalent equipment and instruments
in support of the Procedures and any proposed new procedures, subject to MAI's
written approval, which approval shall not be unreasonably withheld. Valleylab
may propose to MAI that the Procedures be modified to include new
microlaparoscopy procedures and technology in MAI's arrangements with
physicians and/or third party providers. This Agreement and the Exhibits
represent the entire agreement between Valleylab and MAI with respect to the
subject matter hereof, and supersedes any and all existing and prior agreements
between the parties with respect thereto.

         (d)     Notices. Any notice required to be given hereunder by either
party shall be in writing and may be given by hand delivery, by delivery to a
nationally recognized overnight courier, or by sending the same by facsimile or
telex or by registered air mail, postage prepaid, addressed to the other at the
respective numbers, places or addresses set forth below, or to such other
facsimile number, telex number, address, place or places as the parties, or
either of them from time to time may designate in writing. All such notices,
demands and communications shall be deemed to have been duly given or made: (1)
on the date delivered if hand delivered; or (2) five days after the date
deposited via U.S. mail if mailed certified mail, return receipt requested; or
(3) two days after the date deposited via overnight courier, charges prepaid;
or (4) on the date sent if sent by telex or facsimile transmission provided
that (i) in the case of a telex transmission, the receipt





                                       15
<PAGE>   16
of the telex is confirmed by way of the callback signal; (ii) in the case of a
facsimile transmission, receipt of confirmation from the facsimile transmitter
at the conclusion of the transmission of complete and uninterrupted
transmission of the facsimile, on the day of transmission at the place where
the recipient is located except when it is transmitted after 5:00 p.m.
Pennsylvania time at that place, then on the next business day. All notices
shall be sent to the following addresses:

         If to Valleylab: Valleylab, Inc.
                          5920 Longbow Drive
                          Boulder, Colorado 80301
                          Attention: John V. Scibelli, Ph.D., President
                          Telecopier No.: (303) 581-6632

         with a copy to:  Valleylab, Inc.
                          5920 Longbow Drive
                          Boulder, Colorado 80301
                          Attention: Division Counsel
                          Telecopier No.: (303) 581-6632

         If to MAI:       Medical Alliance, Inc.
                          2445 Gateway Drive
                          Suite 150
                          Dallas, Texas 75069
                          Attention: Paul Herchman, President
                          Telecopier No.: (972) 580-8680

         with a copy to:  Jackson & Walker, L.L.P.
                          901 Main Street
                          Suite 6000
                          Dallas, Texas 75202
                          Attention: Richard F. Dahlson
                          Telecopier No.: (972) 953-6187

         (e)     Non-Waiver. No failure by either part to exercise, and no
delay in exercising, any right hereunder shall operate as a waiver thereof; nor
shall any single or partial exercise by either party of any right hereunder
preclude any other further exercise thereof or the exercise of any other right.

         (f)     Headings. Headings in this Agreement are for convenience only
and shall not be used to interpret or construe its provisions.

         (g)     Binding Arbitration. If good faith negotiations between the
parties do not resolve any claim, dispute or other matter arising out of or
relating to this Agreement or the alleged breach hereof within thirty (30) days
after notice of such claim, dispute or other matter is provided to the other
party (the "Claim Notice"), such claim, dispute or other matter shall be
settled by arbitration in accordance with the Commercial Arbitration





                                       16
<PAGE>   17
Rules of the American Arbitration Association, by one arbitrator, who shall be
an attorney, selected by mutual agreement of the parties or, if the parties are
unable to agree upon an arbitrator, then an arbitrator selected by the American
Arbitration Association in accordance with its rules (the "Arbitrator"). The
Arbitrator shall be authorized to retain experts and the costs therefor and of
such arbitration shall be paid as directed by the Arbitrator. The parties agree
that all matters of fact and law shall be decided exclusively by the
Arbitrator, and the Arbitrator shall not have the power to refer to any
applicable court any issues for determination by such court. The parties
irrevocably agree that the arbitration shall be held in the jurisdiction of the
party delivering the Claim Notice. The Arbitrator shall be obliged to render an
award (the "Award") within thirty (30) days of his or her appointment, which
Award shall be final and binding on the parties hereto. Each party hereto
expressly waives the right to appeal the Award to the extent permitted by
applicable law and agrees that judgment upon the Award rendered in any such
arbitration may be made to such court for a judicial acceptance of any such
award made in any such arbitration, or any order of enforcement made therein as
the case may be. Service of process, notices and demands of such arbitration,
and any other notices or other communications required or permitted under this
Section, shall be given in accordance with Section 14(d) hereof. Under no
circumstances shall the Arbitrator have the power to award punitive or similar
damages to any party hereto.

         (h)     Severability. If any term or other provision of this Agreement
is invalid, illegal, or unenforceable by any rule of law or public policy, all
other conditions and provisions of this Agreement shall nevertheless remain in
full force and effect so long as the economic or legal substance of the
transactions contemplated hereby is not substantially affected.

         (i)     Governing Law. This Agreement shall be governed by and
construed in accordance with the laws of the State of Texas, without regard to
choice of law principles.

         (j)     Binding Effect. The provisions of this Agreement shall be
binding upon and inure to the benefit of Valleylab and MAI and their respective
legal representatives, successors, and permitted assigns.

         (k)     Further Assurance. Each party shall promptly execute and
deliver to the other party such further documents and take such further action
as such party may request in order to more effectively carry out the intent and
purpose hereof and to fully protect such party's interests hereunder in
accordance with the Uniform Commercial Code or other applicable law, including
without limitation, the filing of financing and continuation statements,
whether for informational purposes or otherwise.

         (l)     Definition of "Agreement". "Agreement," as used herein, shall
be deemed to refer to this Agreement and any and all Exhibits now or hereafter
executed pursuant hereto.





                                       17
<PAGE>   18
         (m)     Force Majeure. Neither MAI nor Valleylab shall be penalized
under any non-performance standards contained in this Agreement by reason,
directly or indirectly, from fire, explosion, strike, freight embargo, Act of
God, or of the public enemy, war, civil disturbances, quarantine, or epidemic.
MAI and Valleylab agree, however, to use their best efforts to remedy such
mishaps and restore normal business activities within a reasonable period of
time.

         (n)     No Agency Created. This Agreement shall not constitute either
party an affiliate, joint venturer, partner, agent, employee or representative
of the other for any purpose.

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

         IN WITNESS WHEREOF, Valleylab and MAI have caused this Agreement to be
duly executed and is effective as of the date and year first above written.

                                        VALLEYLAB, INC.

                                        By:/s/ JOHN V. SCIBOLLI
                                           ----------------------
                                        Name: John V. Scibolli
                                             --------------------
                                        Title:   President
                                              -------------------

                                        MEDICAL ALLIANCE, INC.

                                        By:/s/ PAUL HERCHMAN
                                           ----------------------
                                        Name:   Paul Herchman
                                              -------------------
                                        Title:  President/CEO
                                              -------------------





                                       18