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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.
Updated June 23, 2016. The labrum is a type of cartilage that surrounds the socket of ball-and-socket joints. A labrum is found in both the shoulder and the hip joint. The labrum forms a ring around the edge of the bony socket of the joint. It helps to provide stability to the joint by deepening the socket, yet unlike bone, it also allows flexibility and motion.