Posterior shoulder dislocation
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The alignment of the humeral head and glenoid is altered with the head of humerus en face on the AP projection with the appearance of a light bulb.
High energy force to the shoulder during a contact sport resulted in this posterior shoulder dislocation, which was proven in theater at the time of reduction.
The classical light bulb sign is well illustrated.
Posterior dislocations make up a tiny proportion of all shoulder dislocations.