The shoulder is the most mobile of all joints. Its bony anatomy is like a ball on a plate. The majority of the stability is provided by the labrum – a fibrocartilaginous rim that makes the plate a more saucer shaped structure – and the capsule, with its associated thickenings (glenohumeral ligaments). When the shoulder is forcibly dislocated, the capsule and labrum usually become detached from the glenoid neck creating a “Bankart lesion”. Treatment of traumatic instability is directed at repairing this lesion and the associated capsular laxity.