Being the most mobile joint in the body is a huge responsibility indeed. This means that the stability of the shoulder is often the first thing that gets sacrificed when a traumatic injury occurs. Another daunting fact is that once a shoulder dislocation or instability episode happens the rate of recurrence in later years is at least 70%.
Traumatic instability (TUBS) is instability that happens from a force that is large enough to injure some of the major supporting structures of the joint like the glenohumeral capsule, ligaments, rotator cuff, or the bone of the humerus or glenoid. Anterior glenohumeral instability is the shoulder condition in which soft-tissue or bony injury allows the humeral head to subluxate or dislocate from the glenoid fossa and the joint surfaces no longer touch each other.