Our Physicians

Physicians Listed by Name

The surgeons at OSOR are certified by the American Board of Orthopaedic Surgery, ensuring expertise in the prevention, diagnosis and treatment of musculoskeletal conditions. The physician team at OSOR has a combined experience of more than 35 years providing quality care in East Tennessee. Click a physician’s image to find out more about our team.


C. Daniel Benson, M.D.

James A. Engblom, D.P.M.

Michael A. MacKay, M.D.

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


Michael P. O'Brien, M.D.