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Fig. 1B. —Illustrations show glenoid and labrum. G = glenoid, L = labrum. Drawing of Perthes lesion as seen in abduction—external rotation position shows that anterior band of inferior glenohumeral ligament becomes taut and induces stress at glenoid insertion, allowing visualization of loose and only partially healed labrum (arrow). Note stripped scapular periosteum (arrowheads).