Dislocation

Anterior shoulder

Most common, 95%, abduction and external rotation

Head of humerus anterior to glenoid fossa and inferior to coracoid process

Posterior Shoulder

5% of shoulder dislocations, MOI, seizure

Internal rotation of humerus, head of humerus wide from glenoid fossa and posterior

Acromioclavicular joint

inferior clavicle and acromion not aligned, widening of coracoclavicular distance

Represents ligament injury

Radial head dislocation

occurs mostly in children, high force injury, often with associated injuries to ulnar

Disruption to radiocapitellar line

Distal radial ulnar dislocation

distal radial ulnar joint dislocation, ulnar head anterior lay or posteriorly displaced

Posterior Hip dislocation

85% of all hip dislocations, often MVA, after hip replacement, congenital disease

Combination of hip flexion, adduction and internal rotation

Anterior Hip dislocation

10% of hip dislocations, MVA, hip replacement, congenital disease

Caused by hyper abduction and extension