Modality: X-ray (Frontal)

- “ The humeral head is forced into internal rotation as it dislocates posteriorly, giving appearance of a lightbulb (see lightbulb sign).  ”

Used in the following article:

  • Lightbulb sign (shoulder dislocation) - “ The lightbulb sign refers to the abnormal AP radiograph appearance of the humeral head in posterior shoulder dislocation. When the humerus disloc...”

View full size version of Lightbulb sign - posterior shoulder dislocation

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