Posterior shoulder dislocation with reverse Hill-Sachs and Bankart lesions
Presentation
Shoulder pain following seizure.
Patient Data
Humeral head locked in internal rotation ("light bulb sign" of posterior dislocation), confirmed on the Y view. Anterior and medial humeral head defect (a "trough line sign" indicating a reverse Hill-Sachs lesion) and small inferior glenoid fracture fragment (reverse Bankart lesion).
Confirms posterior dislocation humeral head and reverse Hill-Sachs and reverse Bankart lesions.
Case Discussion
Posterior dislocation of the humeral head may result in impaction of the anterior humeral head with the posterior glenoid leading to fractures of both of these structures. The humeral fracture is called a reverse Hill-Sachs lesion and when visible on an AP radiograph is called a trough sign. The glenoid injury is called a reverse Bankart lesion.
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