What causes posterior shoulder dislocations?

Updated: Aug 17, 2018
  • Author: Anantha K Mallia, DO, FACEP; Chief Editor: Erik D Schraga, MD  more...
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Answer

Posterior shoulder dislocations usually result from forceful contractions of the internal rotators that occur during seizures and electrical shock. This mechanism can force the humeral head posteriorly, out of its normal alignment and behind the glenoid. Less commonly, posterior shoulder dislocations follow trauma. The mechanism may be a direct blow to the anterior shoulder or a posteriorly directed force applied through the forward-flexed arm.


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