Question
Diagnose the dislocation of shoulder as seen in the picture below ?
A. Posterior dislocation.
B. Anterior dislocation.
C. Central dislocation.
D. None of the above.
Show Answer
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Correct Answer » A
Explanation
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Posterior shoulder dislocations are far less common than anterior shoulder dislocation and can be tricky to identify if only AP projections are obtained.
Typically the humeral head is forced posteriorly in an internal rotation while the arm is abducted. In adults, convulsive disorders are the most common cause. Electrocution is a classic but uncommon cause of posterior shoulder dislocation. In both situations, bilateral dislocations are not infrequent.
Occasionally, they can be the result of strength imbalance within the rotator cuff muscles. Posterior dislocations may even go unnoticed, especially in elderly patients.
