Document:

AMENDMENT TO
                       AGREEMENT OF LIMITED PARTNERSHIP OF
             FAYETTEVILLE LITHOTRIPTERS LIMITED PARTNERSHIP - UTAH I

                  THIS AMENDMENT,  effective as of the 1st day of June, 1999, is
entered into by and among Lithotripters,  Inc., a North Carolina corporation and
the General Partner of Fayetteville  Lithotripters Limited Partnership-Utah I, a
Utah limited  partnership (the  "Partnership"),  and the Limited Partners of the
Partnership.

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

                  1. The General Partner and the Limited  Partners,  hereinafter
collectively  referred to as the "Partners," are parties to that certain Amended
and Restated  Agreement of Limited  Partnership  of  Fayetteville  Lithotripters
Limited  Partnership-Utah  I,  dated  as of  January  7,  1989 as  amended  (the
"Agreement").

                  2. The  Partners  desire to  further  amend the  Agreement  to
reflect the redemption by the  Partnership of an aggregate 1.5% limited  partner
interest from Stacy Childs, M.D.

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

                           Schedule  A-6 is  deleted in its  entirety  and a new
                           Schedule A-7,  attached  hereto is substituted in its
                           place.

                  IN WITNESS WHEREOF, the Partners have hereunto set their hands
and seals effective as of the date first above written.

                                       GENERAL PARTNER:

                                       LITHOTRIPTERS, INC.

                                  By:/s/ Joseph Jenkins, M.D.
                                  --------------------------
                                            Joseph Jenkins, M.D.
                                            President

                                                        -1-

<PAGE>

                                        ALL THE LIMITED PARTNERS OF
                                        THE PARTNERSHIP WHOSE NAMES
                                        APPEARED ON SCHEDULE A-6

                                                     By:/s/ Joseph Jenkins, M.D.
                                                     ---------------------------
                                                      Joseph Jenkins, M.D.
                                                      Attorney-in-Fact*
--------
     *Pursuant  to a Power of  Attorney  given by the  Limited  Partners  in the
Agreement.

                                                        -2-

<PAGE>

                                  SCHEDULE A-7

                        Schedule of Partnership Interests

              FAYETTEVILLE LITHOTRIPTERS LIMITED PARTNERSHIP-UTAH I

      CONTRIBUTIONS OF CAPITAL TO THE PARTNERSHIP AND PERCENTAGE INTERESTS

                                       Cash                   Percentage
General Partner                     Contribution (1)           Interest
------- -------                     ------------               --------

Lithotripters, Inc.                $    19,562.50            19.644670%
2008 Litho Place, Suite 201
Fayetteville, NC  28304

Limited Partners

Joseph Armstrong, M.D.             $ 2,000.00                 1.964467%
1055 North 300 West #303
Provo, UT 84604

Michael J. Bateman                   2,000.00                 1.964467%
Medical Arts Building
1448 East Center, #7
Pocatello, ID 83201

Hal H. Bourne, M.D.                  4,000.00                 2.913706%
324 Tenth Avenue, #178
Salt Lake City, UT 84103

Thomas W. Brady, M.D.                  400.00                  .261929%

Dean L. Bristow, M.D.                2,000.00                 1.964467%
50 South Medical Drive
Payson, UT 84651

Curtis Campbell, M.D.                2,000.00                 1.964467%
3905 Harrison Boulevard
Ogden, UT 84403

                                                        -3-

<PAGE>

Peter M. Cannon, M.D.                3,000.00                    2.947208%
Teton Medical Specialty Center
2001 South Woodruff, Suite 4
Idaho Falls, ID 83404-6370

S. Corbin Clark, M.D.                2,000.00                    1.964467%
9690 South 1300 East, #100
Sandy, UT 84070

Paul K. Clark, M.D.                  2,000.00                    1.964467%
508 East South Temple
Suite 100
Salt Lake City, UT 84102

Robert C. Clift, M.D.                  400.00                     .392893%

Cottage Creek, L.L.C.                  N/A (3)                   1.015228%

Ronald H. Crouch, M.D.               4,000.00                    2.619289%
515 South 300 East
St. George, UT 84770

Duane E. Davis, M.D.                 2,000.00                     .982234%
930 North Fifth West
Provo, UT 84601

Danielle Davis Trust                   N/A (3)                    .982234%

Jonathan Garey-Sage, M.D.              400.00                     .392893%

David Henderson, M.D.                2,000.00                    1.964467%
415 Medical Drive, #202A
Bountiful, UT 84010

James C. Jensen, M.D.               52,500.00                     .761421%

Thomas H. Jordan                       750.00                     .491371%
82 Highwood Street
Louisville, KY 40206

David Kimball, M.D.                  4,000.00                    3.928934%
5770 South 250 East, #305
Salt Lake City, UT 84107

                                                        -4-

<PAGE>

Kenneth Kofoed, M.D.                 2,000.00                    1.964467%
2084 North 1700 West
Layton, UT 84041

Richard E. Lee, M.D.                 2,000.00                    1.964467%
324 Tenth Avenue, #178
Salt Lake City, UT 84103

Lithotripters, Inc.                  4,000.00(2)                15.28934%
2008 Litho Place
Fayetteville, NC 28304

Ned L. Mangelson, M.D.               2,000.00                    1.964467%
333 South Ninth East
Salt Lake City, UT 84102

Michael McFadden, M.D.              35,000.00                     .507614%

Richard B. Melzer, M.D.              1,000.00                     .654822%
2825-8th Avenue North
Billings, MT 59101

Anthony W. Middleton, Jr., M.D.      2,000.00                    1.964467%
1060 East First South, #112
Salt Lake City, UT 84102

George W. Middleton, M.D.            2,000.00                    1.964467%
1060 East First South, #112
Salt Lake City, UT 84102

James F. Morrell, M.D.               2,000.00                    1.964467%
1220 East 3900 South
Salt Lake City, UT 84124

Steven L. Moss, M.D.                   400.00                     .261929%

Ronald I. Oldroyd, M.D.              3,000.00                    1.964467%
930 North 500 West
Provo, UT 84601

Stephen Richardson, M.D.             2,000.00                    1.309645%
3980 South 700 East, #20
Murray, UT 84107
                                     - 5 -
<PAGE>

Odell F. Rigby, M.D.                 4,000.00                    3.928934%
333 South Ninth East
Salt Lake City, UT 84102

Ronald J. Saunders, M.D.             2,000.00                    1.964467%
120 North, 1220 East
American fork, UT 84003

John G. Scott, M.D.                    400.00                     .261929%

Herbert B. Spencer, M.D.             2,000.00                    1.964467%
920 North Fifth West
Provo, UT 84601

Charles T. Swallow, M.D.             2,000.00                    1.309645%
225 East Fourth North
Logan, UT 84321

Roger H. Tall, M.D.                  4,000.00                    3.928934%
Teton Medical Specialty Center
2001 South Woodruff, Suite 8
Idaho Falls, ID 83404-6370

Timothy Taylor, M.D.                35,000.00                     .507614%

Perry T. Walters, M.D.               2,000.00                    1.964467%
425 Medical Drive
Bountiful, UT 84010

Vanez B. Wilson, M.D.                2,000.00                    1.309645%
3980 South 700 East, #20
Murray, UT 84107
                                  --------------                 -------

             TOTAL                $320,812.50                     100%

(1)      The cash contributions  reflect the initial cash contributions of those
         Partners who currently hold an interest in the Partnership.

(2)  Lithotripters,  Inc.  acquired a portion of its  limited  partner  interest
pursuant to various  assignments from existing limited partners and made no cash
contributions to the Partnership for the limited partner interests received as a
result of such assignments.

                                                        -6-

<PAGE>

(3)      Acquired  its limited  partner  interest  pursuant to  assignment  from
         existing  limited  partner  and  made  no  cash  contributions  to  the
         Partnership  for the limited partner  interest  received as a result of
         such assignment.

                                                        -7-

<PAGE>THIRD AMENDMENT TO
                       AGREEMENT OF LIMITED PARTNERSHIP OF
                   FLORIDA LITHOTRIPTERS LIMITED PARTNERSHIP I

                  THIS  AMENDMENT,  effective  as of the 30th day of  September,
1999,  is  entered  into by and  among  Lithotripters,  Inc.,  a North  Carolina
corporation and the General Partner of Florida Lithotripters Limited Partnership
I, a Florida limited partnership (the  "Partnership"),  and the Limited Partners
of the Partnership.

                                    RECITALS:
                                    --------

                  1. The General Partner and the Limited  Partners,  hereinafter
collectively referred to as the "Partners",  entered into that certain Agreement
of Limited  Partnership  of Florida  Lithotripters  Limited  Partnership I dated
August 5, 1991, as amended.

     2. The Partners  desire to amend the Agreement to reflect the assignment by
D. Russell Locke and Ira W. Klimberg of their  respective  1.95% limited partner
interests  in the  Partnership  to  Lithotripters,  Inc.,  and the  admission of
Lithotripters, Inc. as a substitute Limited Partner.

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

                           Schedule  A-3 is  deleted  in its  entirety  and  new
                  Schedule A-4, attached hereto, is substituted in its place.

                  IN WITNESS WHEREOF, the Partners have hereunto set their hands
and seals effective as of the date first-above written.

                                         GENERAL PARTNER:

                                         Lithotripters, Inc.

                                         By:
                                                Name:
                                                Title:

                                        ALL THE LIMITED PARTNERS OF THE
                                        PARTNERSHIP WHOSE NAMES APPEAR ON
                                        SCHEDULE A-3

                                         By:/s/ Joseph Jenkins, M.D.      (SEAL)
                                         ---------------------------
                                                Joseph Jenkins, M.D.,
                                                Attorney-in-Fact*

*  Pursuant  to a  Power  of  Attorney  given  by the  Limited  Partners  in the
Agreement.

                                                      -1-

<PAGE>

                                                                    SCHEDULE A-4

                        Schedule of Partnership Interests

                   Florida Lithotripters Limited Partnership I

           CONTRIBUTIONS OF CAPITAL TO THE PARTNERSHIP AND GUARANTIES

                                Cash            Percentage
General Partner         Contribution            Interest

Lithotripters, Inc.       $49,687.52             20.0000

Limited Partners

John P. Adams               2,500.00              1.0000

Stephen W. Alcorn           2,500.00              1.0000

Thomas Ayers                2,500.00              1.0000

Dan Beraha                  4,875.00              1.9500

Jim Brady                     936.68              0.4163

B. Thomas Brown             4,500.00              1.8000

Joseph L. Camps             3,250.00              1.3000

Anthony L. Cantwell         2,500.00              1.0000

Charles Cartwright          2,500.00              1.0000

Ramesh Chopra               2,500.00              1.0000

Franklin Clark                937.58              0.4167

Mark Cohen                  2,500.00              1.0000

J. A. Colom                 3,250.00              1.3000

David Cunningham            4,125.00              1.6500

Allan Davis                 2,500.00              1.0000

Stephen L. Deardourff       2,500.00              1.0000

Fran Deture                 N/A (1)               1.0000

Pareshkumar Desai           4,875.00              1.9500

Martin K. Dineen            4,125.00              1.6500

Neil P. Dunn                2,500.00              1.0000

Basil Fossum                2,500.00              1.0000

Clark Gaddy                 2,500.00              1.0000

Philip Gallina                937.58              0.4167

John Garner                 2,500.00              1.0000

Michael Grable              4,125.00              1.6500

Frank Greskovich            2,500.00              1.0000

William Grine                 937.58              0.4167

<PAGE>

                                Cash            Percentage
General Partner         Contribution            Interest

Lawrence Hatchattq          $2,500.00            1.0000%

Dennis Healey                N/A (2)             0.6500

Warren T. Hitt              3,250.00             1.3000

Joseph Jenkins                937.58             0.4167

William Jones               2,500.00             1.0000

Thomas Jordan                 937.58             0.4167

William Jordan                937.58             0.4167

Charles King                4,875.00             1.9500

Robert Lankford             4,875.00             1.9500

Lithotripters, Inc.           N/A (3)            6.0500

Mark McCaughan              2,500.00             1.0000

Alvie Carl McCully          2,500.00             1.0000

David Miles                 3,250.00             1.3000

Thomas Mobley                 937.58             0.4167

Bert Morrow                 4,500.00             1.8000

Dan Myers                     937.58             0.4167

Robert C. Newman            5,375.00             2.1500

Enrique Panlilio            2,500.00             1.0000

Greg Parr                   1,250.00             0.5000

Jack Paulk                  4,875.00             1.9500

Dennis Peters               2,500.00             1.0000

William Eugene Potts, Jr.   2,500.00             1.0000

Tony Rand                     937.58             0.4167

Edward Rietze                 937.58             0.4167

Raleigh Rollins             2,500.00             1.0000

Tom Sanders                 2,500.00             1.0000

W. Paul Sawyer              2,500.00             1.0000

Scott Sellinger             2,500.00             1.0000

Fouad Shami                 2,500.00             1.0000

John Sharpe                 4,875.00             1.9500

David Sneed                 4,125.00             1.6500

James C. Springer           2,500.00             1.0000

Thomas F. Stringer          2,500.00             1.0000

Harvey Taub                    N/A (4)           0.6500

Alan Terry                    937.58             0.4167

Derrick Thompson            2,500.00             1.0000

John W. Timmons             2,500.00             1.0000

Minoo Vaghaiwalla           3,250.00             1.3000

Dixon Walker                2,500.00             1.0000

John Wescot                 3,250.00             1.3000

<PAGE>

                                Cash            Percentage
General Partner         Contribution            Interest

Robert Youngman           $2,500.00              1.0000%

Thomas Zachos              2,500.00              1.0000

Nicholai Zelneranok        3,250.00              1.3000

         TOTAL          $245,187.58            100.0000

(1)      Fran Deture purchased his limited partnership  interest from the Estate
         of David Drylie and, therefore,  he made no capital contribution to the
         Partnership.

(2)      Dennis  Healey  received  his limited  partnership  interest  due to an
         assignment from the Estate of Byron H. McCormick and,  therefore,  made
         no capital contribution to the Partnership.

(3)  Lithotripters,  Inc. purchased its limited partnership interest pursuant to
     various assignments from existing Limited Partners and, therefore,  made no
     capital contribution to the Partnership as a result of its purchase of such
     interest.

(4)      Harvey  Taub  received  his  limited  partnership  interest  due  to an
         assignment from the Estate of Byron H. McCormick and,  therefore,  made
         no capital contribution to the Partnership.

<PAGE>

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