Posterior shoulder dislocation

Case contributed by Dr Nicholas Plundo

Presentation

23 year old male presents with new onset seizure and shoulder pain with limited range of motion.

Patient Data

Age: 23
Gender: Male
Modality: X-ray

Increased space between humeral head and glenoid. Shoulder appears to be in internal rotation. Subtle posterior displacement of humeral head on scapular Y view.

Modality: CT

The humeral head is dislocated posteriorly and impacted against the posterior glenoid. Bony defect with cortical discontinuity identified along the anterolateral surface of the humeral head (reverse Hill-Sachs lesion).

Multiple small bony fragments seen posterior to the posterior glenoid, likely representing fracture fragments (reverse bony Bankart lesion).

Case Discussion

Classic CT findings of acute posterior shoulder dislocation with impaction fracture of the humeral head (reverse Hill-Sachs lesion) and fractures of the posterior glenoid (reverse bony Bankhart lesion).

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Case Information

rID: 44363
Case created: 19th Apr 2016
Last edited: 18th Apr 2017
Inclusion in quiz mode: Included

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