The shoulder is a synovial joint that is made up of three bones: the humerus, the scapula, and the clavicle. Stability is achieved overall through static and dynamic restraints. Normally, the humerus head remains centered in the glenoid fossa. This allows the joint surfaces to be congruently aligned with one another. Furthermore, the glenoid arc contains the glenohumeral joint reaction force. Shoulder dislocations can occur in both the anterior and posterior directions. The most common is due to trauma from a direct posterolateral force on the shoulder. Individuals may also exhibit a direction of instability, which may predispose them to a dislocation. In this case, the muscles are either unprepared or overwhelmed by the force. Primary shoulder dislocation occurs in between 15.3 and 56.3% of 100000 people each year.
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