Posterior prosthetic shoulder dislocation
Wrong move (no fall or major trauma), sudden shoulder pain and inability to move the arm, no vascular or neurologic complication but intense pain and arm blocked against chest.
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No fracture, shoulder prosthesis, dislocation of the humeral head posteriorly to the glenoid, better seen on the lateral view.
Since the dislocation mechanism appeared to be a wrong move, attempted reduction was performed under analgesia and conscious sedation, but this one failed and required the assistance of orthopedic surgeon under general anesthesia.