Light bulb sign (posterior shoulder dislocation)
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At the time the article was created Andrew Dixon had no recorded disclosures.View Andrew Dixon's current disclosures
At the time the article was last revised Daniel J Bell had no recorded disclosures.View Daniel J Bell's current disclosures
The light bulb sign refers to the abnormal AP radiograph appearance of the humeral head in posterior shoulder dislocation.
When the humerus dislocates it also internally rotates such that the head contour projects like a light bulb when viewed from the front 1.