Posterior shoulder dislocation
Presentation
Motor vehicle accident, complaint of left shoulder pain and limited mobility.
Patient Data
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Suspected left posterior shoulder dislocation due to the patient abnormal posture from the visualized dorsal spine scoliosis with the convexity to the left, rendered a difficult interpretation of the frontal projection. Suspected light bulb sign appearance.
The patient could not do the axillary view because of pain.
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Posterior dislocation of the left shoulder joint noted, lipohemarthrosis and a tiny chip fracture of the postrior glenoid rim.
Sclerotic foucs noted at the part of humeral head behind the posterior glenoid margin; this is seen in the frontal radiographs as the rim sign and trough line sign.
Simple/pseudocyst noted in the proximal humeral metaphysis.
Spondylarthritic changes in the visualized dorsal spine and scoliosis.
Left pulmonary apical fibrosis with cystic changes.
The rest of the bones are unremarkable.
Case Discussion
Posterior shoulder dislocation is an unusual presentation in the setting of a motor vehicle accident. In suspected cases or when there is concomitant advanced bony changes/dysplasia; assessment with computed tomography makes it easier for the diagnosis.
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