Displacement of the biceps with subscapularis avulsion

There are many reports of traumatic and spontaneous medial dislocation of the long head of biceps (Sl#{228}tisand Aa!to 1979; Dines, Warren and Inglis 1982; Petersson 1986) and the condition is well recognised in patients with complete tears of the rotator cuff (Wolfgang 1974). We report two cases where, in the presence of a complete subscapularis rupture, the tendon of the long head of biceps was found to have dislocated posteromedially into the glenohumeral joint. Case 1. A man aged 36 years fell awkwardly injuring his left shoulder. The joint was not dislocated when he was seen in the accident unit, but he was in a great deal of pain and could not lift his arm actively. The original radiograph showed no evidence of a fracture. He failed to improve after conservative treatment and an arthro-