PT - JOURNAL ARTICLE AU - Chan, Warwick AU - Chase, Helen Emily AU - Cahir, John G AU - Walton, Neil Patrick TI - Calcific tendinitis of biceps femoris: an unusual site and cause for lateral knee pain AID - 10.1136/bcr-2016-215745 DP - 2016 Jul 29 TA - BMJ Case Reports PG - bcr2016215745 VI - 2016 4099 - http://casereports.bmj.com/content/2016/bcr-2016-215745.short 4100 - http://casereports.bmj.com/content/2016/bcr-2016-215745.full AB - A 37-year-old man presented to the acute knee and sports medicine clinic with atraumatic lateral knee pain. He had point tenderness over the lateral aspect of his knee which had not settled with anti-inflammatory medications. Imaging revealed a large opaque lesion lateral to the knee and although there was no clear mechanism, injury to the posterolateral corner was considered. An MRI subsequently revealed a rare case of calcific tendinitis to the biceps femoris tendon insertion. This condition was self-limiting and did not require interventions such as steroid injections. This is the first reported case of calcific tendinitis of biceps femoris as a cause of acute knee pain.