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Imaging Signs of Posterior Glenohumeral Instability

¹ Present address: Musculoskeletal Division, Department of Radiology, Brigham and Women's Hospital, 75 Francis St., ASB-1, L-1, Rm. 003E, Boston, MA 02115.
² Department of Diagnostic Imaging, Rhode Island Hospital, The Warren Alpert Medical School of Brown University, Providence, RI.

OBJECTIVE. The purpose of this article is to review mechanisms of injury leading to posterior glenohumeral instability and the correlated imaging findings on CT and MRI.

CONCLUSION. In patients with suspected posterior glenohumeral instability, imaging of the affected shoulder can show abnormalities of the bone, labrum, and joint capsule. Accurate detection and characterization of these lesions aid in both diagnosis and management.

Keywords: Bennett lesion • glenohumeral instability • humeral avulsion of the posterior glenohumeral ligament • POLPSA lesion • reverse Bankart fracture • reverse Hill-Sachs fracture • shoulder instability • sports medicine

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