Presentation
Instability after an anterior glenohumeral joint dislocation.
Patient Data
Extensive chondrolabral separation involving the anterior half the labrum and extending across the AP length of the superior labrum. The anteroinferior labrum periosteum attachment is intact. Findings in keeping with Perthes lesion and a SLAP tear. Small Hill-Sachs defect.
Case Discussion
There are various descriptions of labral injuries which are identified in glenohumeral arthrography. A SLAP tear involves the origin of the long head of the biceps and its attachment on the superior labrum, and differentiating with a sublabral sulcus is one aspect in interpreting shoulder MRIs. A Perthes lesion will have an intact periosteum.
Clock face terminology is used in the descriptions of labral injuries, but one should bare in mind 3 o'clock can mean both anterior and posterior positions at the equator. Therefore if clock face descriptions are used, the 3 o'clock position should be referenced in the report.
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