الفهرس 
AnatomyOnly 14 pages are availabe for public view
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Abstract
The shoulder is the most mobile joint in humans whose stability requires the interaction of both dynamic and static stabilizers (1). Its wide range of movement predisposes to a high susceptibility to dislocation accounting for nearly 50% of all dislocations (2). The gleno-humeral instability can be classified according to the cause into traumatic or non-traumatic and according to the direction into anterior, posterior, inferior or multi-directional where traumatic anterior dislocation accounts for the majority of instabilities (3). Recurrent anterior gleno-humeral instability after traumatic shoulder dislocation is a common orthopedic problem and can stem from variety of co-existing factors as labroligamentous tear and glenoid or humeral head bone loss (1). Bankart lesion which is an antero-inferior labro-ligamentous avulsion from the glenoid is the most common injury following the anterior shoulder dislocation (4). Bony injuries of both humeral head and glenoid are also common. An impaction injury to the postero-superior lateral humeral head from contact with the antero-inferior glenoid, known as a Hill-Sachs lesion, occurs in approximately 80% of initial dislocation and in up to 93% of patients with recurrent instability (5-7). On the other hand, the glenoid bone defects, known as bony Bankart, have been reported in up to 22% of first time dislocation and in up to 90% of patients with recurrent instability (8). There is a positive correlation between the number of recurrent dislocations and the size of these lesions (9).