Our Physicians

Cletus J. McMahon, Jr., M.D.


Cletus J. McMahon, Jr., M.D. was born and raised in Oak Ridge, Tennessee. In addition, he was educated in the Oak Ridge school system. Dr. McMahon attended Tennessee Tech University in Cookeville on a tennis scholarship. He received his medical degree from the University of Tennessee College of Medicine in Memphis. Dr. Benson is a board certified by the American Board of Orthopaedic Surgery.

Dr. McMahon completed his residency in orthopaedic surgery at the University of Tennessee Medical Center in Knoxville and has practiced orthopaedic surgery in Oak Ridge since 1979.  Dr. McMahon is currently a member of the board of OrthoTennessee where he also served as Board President for 18 years.

Dr. McMahon has been the team physician for the Oak Ridge High School football team since 1980. He is married with four grown children as well as five grandchildren. When Dr. McMahon and his family spend time together they enjoy sports and outdoor activities, particularly on Norris Lake.


Contact Information

Office Info 865-481-2541
Office Location

90 Vermont Ave., Ste. 300, Oak Ridge, TN 37830



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Cletus J. McMahon, Jr., M.D.

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  • Tennessee Technological University, 1971
  • M.D., University of Tennessee, Knoxville, Tennessee, 1975


  • University of Tennessee, Knoxville, Tennessee, 1975


  • University of Tennessee, Knoxville, Tennessee, 1978

Began Practice At OTOR

  • 1979

Board Certification

  • American Board of Orthopaedic Surgery, 1980

Professional Distinctions

  • Roane-Anderson Medical Society
  • Tennessee Medical Association
  • American Medical Association
  • Knoxville Orthopedic Society
  • Tennessee Orthopaedic Society
  • American Academy of Orthopaedic Surgeons

special interests

  • Sports Medicine
  • Joint Replacement