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Posterior glenohumeral joint dislocation

Case contributed by Dr Dai Roberts


Epileptic. Seizure and shoulder pain.

Patient Data

Age: 20 years

'Lightbulb' sign of the humeral head, with the axillary view confirming a posterior glenohumeral joint dislocation with an engaging reverse Hill-Sachs defect.  An entonox device overlies the chest.  

Case Discussion

The lightbulb sign occurs when the humeral head is posteriorly dislocated causing humeral head internal rotation giving this appearance.  A second view should be used to confirm these findings, or CT when positioning can be difficult due to pain and/or associated fracture.  

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Case information

rID: 80397
Published: 22nd Jul 2020
Last edited: 25th Jul 2020
Inclusion in quiz mode: Included
Institution: St. Paul's Hospital

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