The snapping biceps femoris syndrome.

Snapping of tendons is a well-described entity in the literature, occurring mostly in athletes around the hip, ankle, shoulder, and elbow, but rarely the knee. A case of snapping of the biceps femoris tendon (BFT) in a patient with a painful knee and no history of trauma is described. An abnormal anterior insertion of the BFT was found to be the cause of the pain and snapping. Surgical treatment, reinsertion of the tendon in its anatomic position, completely corrected the abnormality, whereas conservative treatment failed.