Inferior shoulder dislocation
An inferior shoulder dislocation is the least common form of shoulder dislocation. The condition is also called luxatio erecta because the arm appears to be permanently held upward or behind the head, in fixed abduction.
It is caused by a hyperabduction of the arm that forces the humeral head against the acromion.
The humeral head is displaced directly below, and a little medial to the glenoid fossa, with the arm often in marked abduction (luxatio erecta).
An inferior dislocation can mimic a subcategory of glenohumeral dislocation known as a sub glenoid anterior dislocation. Where the humeral head rests directly inferior to the glenoid in the AP and lateral projection 4 .
Inferior dislocations have a high complication rate with secondary vascular, neurological, tendon, and ligament injuries.
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