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About Us
Founded in 1994 by Lawrence D. Dorr, MD, Operation Walk surgeons, nurses and health professionals have operated on more than 3,000 patients in Russia, Cuba, Nepal, China, the Philippines, Nicaragua, Mexico, El Salvador, and the United States.

Operation Walk, Maryland is established by Harpal S. Khanuja, MD and Maria Khanuja, RN, and is supported by a dedicated team of colleagues and volunteers.
The mission of Operation Walk Maryland is to improve the quality of life of disadvantaged patients around the world suffering from joint diseases. Operation Walk Maryland achieves this goal by the following:
  • Providing free joint replacement surgery and care to impoverished individuals in need.
  • Educating local orthopedic surgeons and their healthcare teams about the current treatment and technologies available to treat individuals suffering from debilitating joint disease.
Operation Walk Maryland commits to ongoing education and patient care in these impoverished communities. Operation Walk Maryland uses the best trained and skilled healthcare providers to delivery the highest level of care that we have in the United States.  There is no cost to the patient or community that we serve.  All time and supplies are provided through donations.

Knee and hip replacements are among the most cost-effective medical procedures.  They greatly enhance the quality of life of those suffering with arthritic pain, so they can be more active members of their community.

Outreach / History
• Peru, October 2008

Lima, 48 joint replaced

  • Monty Ahuja, MD
  • Lowry Barnes, MD
  • Craig Della Valle, MD
  • Michael Jacobs, MD
  • Craig Morrison, MD
  • Paul Khanuja, MD
• El Salvador, May 2007, 64 joints replaced
  • Aaron Hofmann, MD
  • Harold Dunn, MD
  • Chris Peters, MD
  • Paul Khanuja, MD
  • William Long, MD
  • Michael Hoffman, MD
• Guatemala, November 2006
  • Lawrence Dorr M.D.
  • Ronald Sandler M.D.
  • Cecil Rorabeck M.D.
  • Bob Booth M.D.
  • Bob Bourne M.D.
  • Jonathan Cohen M.D.
  • Brian Parsley M.D.
  • Aaron Hoffman M.D.
• Panama, April 2006
  • Doug Dennis M.D.
  • Todd Miner M.D.
  • Bob Booth M.D.
  • David Allmacher M.D.
  • Dr. Nakano M.D.
  • Chris Lynch M.D.
  • Carlos Lavernia M.D.
• Cuba, April 2006
• Nicaragua, April 2006

Roberto Calderon Hospital

  • Lawrence Dorr M.D.
  • Gerry Engh M.D.
  • William Overdyke M.D.
  • Bob Porter M.D.
  • Jim McAuely M.D.
  • William Hamiliton M.D.
  • William Long M.D.
  • Ron Sandler M.D.
• Panama, November 2005
  • Lawrence Dorr M.D.
  • William Long M.D.
  • Bob Booth M.D.
  • Cecil Rorabeck M.D.
  • Jeffrey Passick M.D.
  • Norman Young M.D.
  • Mark Woolf M.D.
  • William Montgom M.D.
  • Doug Dennis M.D.
  • Carlos Lavernia M.D.
• China, August 2005
  • Lawrence Dorr M.D.
  • David Stulberg M.D.
  • Rama Chandran M.D.
  • Ronald Sandler M.D.
  • Paul Gilbert M.D.
  • Richard Wixson M.D.
  • Raj Ghate M.D.
  • Lal Puri M.D.
  • Nasim Rana M.D.
  • George Tang M.D.
• El Salvador, March 2005
  • Lawrence Dorr M.D.
  • Carlos Lavernia M.D.
  • Steve Lyons M.D.
  • Kenneth Gustke M.D.
  • Jose Gomez M.D.
  • Jonathan Cohen M.D.
  • Davis Bindleglass M.D.

Hermano Pedro Hospital, 40 joints replaced

  • Lawrence Dorr M.D.
  • Carlos Lavernia M.D.
  • Michael Mynatt M.D.
  • Benjamin Song M.D.
  • Mark Woolf M.D.
  • Norman Young M.D.
  • William Bugbee M.D.
  • Brian Parsley M.D.

CIMEQ Hospital, 46 joints replaced

  • Lawrence Dorr M.D.
  • Ken Gustke M.D.
  • Robert Zann M.D.
  • Andrew Yun M.D.
  • John Kagan M.D.
  • David Dore M.D.
  • Steve Lyons M.D.
  • Carl Zooberg M.D.
  • Guatemala, November 2004
  • Cuba, May 2004
• Guatemala, March 2004

Hospital of the Military, 46 joints replaced

  • Merrill Ritter M.D.
  • John Berend M.D.
  • Chris Kavolous M.D.
  • Brian Crites M.D.
  • Dr. Pierson M.D.
  • Jim Scott M.D.
  • Chris Christensen M.D.
• Nepal, March 2004

Nepal Medical Teaching Hospital, 38 joints replaced

  • Lawrence Dorr M.D.
  • Raj Manier M.D.
  • Rama Chandran M.D.
  • Ronald Sandler M.D.
  • Bob Porter M.D.
  • Christopher Cox M.D.
• Nicaragua, November 2003

Roberto Calderon Hospital, 46 joints replaced

  • Lawrence Dorr M.D.
  • Doug Dennis M.D.
  • Carlos Lavernia M.D.
  • William Long M.D.
  • Todd Miner M.D.
  • David Allmacher M.D.
  • Ginger Holt M.D.
• Peru, May 2003

Hospital Regional de Trujillo, 38 joints replaced

  • Micheal Mynatt M.D.
  • Carlos Lavernia M.D.
  • David Bindleglass M.D.
  • Bob Porter M.D.
  • Ronald Sandler M.D.
• Cuba, April 2003,

Frank Pais Hospital, 36 joints replaced

  • Merrill Ritter M.D.
  • John Berand M.D.
  • Dr. Kavolus M.D.
  • Phil Farris M.D.
  • Brian Crites M.D.
  • Brent Bankston M.D.
  • Jeff Pierson M.D.
• Nicaragua, March 2002

Roberto Calderon Hospital, 46 joints replaced

  • Lawrence Dorr M.D.
  • Bob Porter M.D.
  • Ronald Sandler M.D.
  • Ronald Carn M.D.
  • Dennis McGee M.D.
  • William Long M.D.
  • Doug Dennis M.D.
  • Carlos Lavernia M.D.
• Philippines, February 2001

Vicente Soto Medical Ctr 38 joints replaced

  • Lawrence Dorr M.D.
  • Donald Longjohn M.D.
  • David Bindleglass M.D.
  • Jonathan Cohen M.D.
  • Kevin Heaton M.D.
  • Bob Porter M.D.
• Cuba, June 2000

Frank Pais Hospital, 63 joint replacements

  • Lawrence Dorr M.D.
  • Merrill Ritter M.D.
  • William Long M.D.
  • Michael Berend M.D.
  • Carlos Lavernia M.D.
  • Robert Porter M.D.
  • Brian Crites M.D.
• Nepal, January 2000

Nepal Medical Teaching Hospital, 23 joints replaced

  • Lawrence Dorr M.D.
  • Micheal Mynatt M.D.
  • Robert Zann M.D.
  • Raj Manier M.D.
  • Ronald Sandler M.D.
  • Robert Porter M.D.
• China, October 1998

Friendship Hospital, 19 joint replacements

  • Lawrence Dorr M.D.
  • Ronald Carn M.D.
  • Donald Longjohn M.D.
• Cuba, June 1997

CIMEQ Hospital, 45 joint replacements

  • Lawrence Dorr M.D.
  • Merrill Ritter M.D.
  • Ronald Sandler M.D.
  • Donald Longjohn M.D.