ABSTRACT
Clinical problems Shoulder instability may be classified as either traumatic or atraumatic. The shoulder may dislocate or subluxate in one or more directions.
1. Acute anterior dislocation is the commonest shoulder dislocation and accounts for 98% of all cases. The humeral head usually dislocates to a subcoracoid or infraglenoid position in response to forced external rotation in an abducted extended position.
