Posterior shoulder dislocation

Case contributed by Shahmeer Khan
Diagnosis almost certain


History of fall, now presented with shoulder pain.

Patient Data

Age: 75 years
Gender: Male

Light bulb configuration of the humeral head in relation to the glenoid cavity. Y view confirms the posteriosuperior dislocation of the humeral head.

Case Discussion

Light bulb sign is characteristic of posterior shoulder dislocation on frontal radiograph.

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