Anterior Dislocation of the Shoulder ·         Glenohumeral dislocation most common shoulder dislocation (85%) ·         Glenohumeral joint dislocations make up >50% of all dislocations in the body ·         Anterior / subcoracoid shoulder dislocation (96%) ·         Mechanism o       External rotation and abduction and external rotation ·         Age o       Younger individuals ·         May be associated with o       Hill-Sachs defect (50%) is a depression fracture of posterolateral surface of humeral head from impaction of the head against glenoid rim in subglenoid type §         Best demonstrated on the AP projection with the arm internally rotated o       Bankart lesion is a fracture of anterior aspect of inferior glenoid rim §         Only cartilaginous portion of glenoid labrum may be fractured which may only be visible on MRI o       Fracture of greater tuberosity (15%) ·         Complications o       Recurrent dislocations (40%) o       Post-traumatic arthritis o       Injury to axillary nerve or artery Anterior Dislocation of the Humeral Head: Top image shows humeral head displaced from glenoid and lying inferior to the coracoid process (red arrow); the middle image demonstrates a defect along the posterolateral aspect of the head, which is the Hill-Sach's deformity (green arrow). The lower image is the scapular Y view (blue line outlines scapula). The head lies in a subcoracoid (i.e. anterior location). The white arrows point to the acromion.