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The glenoid labrum is a fibrocartilaginous rim attached around the margin of the glenoid cavity that serves to deepen the cavity. (The glenoid fossa of the scapula is relatively shallow, contacting at most only a third of the head of the humerus). The labrum is triangular in shape with a broad base and is fixed to the glenoid tapering to a thin free edge. The tendon of the long head of the biceps brachii blends with the labrum at the apex of the glenoid. Labral tears may result from acute injury, especially when the humeral head dislocates or subluxates, but also from traction via the biceps. Many labral tears are degenerative and are discovered incidentally on MRI.
Full Article - https://www.orthopaedia.com/disorder-of-the-glenoid-labrum/
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