Perthes lesion is a variant of Bankart lesion, presenting as an anterior glenohumeral injury that occurs when the scapular periosteum remains intact but is stripped medially and the anterior labrum is avulsed from the glenoid but remains partially attached to the scapula by intact periosteum.

Additional views in ABER (ABduction and External Rotation) of the shoulder aid in this diagnosis.

Differential diagnoses include: Treatment is surgical re-attachment of the labrum preferably via arthroscopy.

[citation needed] It is named after Georg C. Perthes (1869-1927), a German Surgeon and X-Ray diagnostic pioneer who first described the lesion in 1905.

Perthes Lesion (A Variant of the Bankart Lesion): MR Imaging and MR Arthrographic Findings with Surgical Correlation Thorsten K. Wischer, Miriam A. Bredella, Harry K. Genant, David W. Stoller, Frederic W. Bost, and Phillip F. J. Tirman AJR January 2002 178:233-237 2.