- Etiology: often related to seizure / electric shock
- Imaging: document dislocation, look for reverse Hill Sachs deformity and other fracture or loose body
- Complications: Hills Sachs deformity is anteromedial compression fracture secondary to impaction of humeral head against posterosuperior glenoid which affects top 2 cm of humeral head, reverse Bankart lesion – impaction injury of posterior / superior glenoid
- Clinical: posterior shoulder dislocation seen 3% of time