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- Causes: electrocution and seizures
- Findings
–Trough sign: vertical compression fx of anteromedial humeral head
–Rim sign: widening of glenohumeral joint > 6 mm
–Absent crescent sign: separation of humerus from glenoid such that normal overlap is lost
–Humerus fixed in internal rotation
- If suspected, get transscapular Y view (axillary view OK, but painful and may dislocate a spontaneously relocated shoulder)
–Humeral head lies posterior to glenoid, center of the “Y”
- CT: evaluate complications such as reverse Hill Sachs or reverse Bankart, stripping of posterior periosteum, tear of posterior labrum