Posterior shoulder instability

Case contributed by Dr Mohammad A. ElBeialy


Recurrent shoulder dislocation with shoulder pain and limited movement.

Patient Data

Age: 30
Gender: Male
  • posterior dislocation of the left shoulder joint with posterior translation of the humerus relative to the glenoid. 
  • the humeral head shows internal rotation with light-bulb appearance on the CT scout view.
  • depression fracture antero-medial humerus is noted (Trough's sign).
  • fracture posterior inferior glenoid bone (reversed Bankart's lesion) 
  • Bennet's lesion with linear calcification adjacent to a focal sclerosis in the posterior osseous glenoid as well as posterior labro-capsular periosteal sleeve avulsion (POLPSA) lesion.
  • mild joint effusion.

Case Discussion

Posterior shoulder instability (dislocation) with fracture of the antero-medial humerus (Trough sign), reversed osseous Bankart's lesion as well as Bennet's lesion of the posterior inferior labrum with POLPSA lesion and joint effusion.

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Case information

rID: 25227
Published: 13th Oct 2013
Last edited: 14th Aug 2019
Inclusion in quiz mode: Included

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