- Adult patients with knee pain < 6 months with acute onset who had failed conservative treatment and elected for arthroscopic management. Indications for surgery included the presence of mechanical symptoms on history, a physical examination positive for McMurray's maneuver or joint line tenderness or both32, absence of severe joint space narrowing on plain radiography1 33, and the presence of grade III signal changes on MRI35 in an anatomic location consistent with the history and physical examination.