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The glenoid labrum (glenoid ligament) is a fibrocartilaginous rim attached around the margin of the glenoid cavity in the shoulder blade.
The labrum can tear as a result of trauma or with wear and tear. The normal labrum is a smooth ring of tissue that surrounds the socket of the shoulder. Labral tears are often caused by a direct injury to the shoulder, such as falling on an outstretched hand. The biceps tendon attaches to the top part of the labrum. The biceps is the large muscle on the front of your upper arm.