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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 hip is a ball and socket joint. The labrum is an O-ring cartilage around the socket. It can become torn for a variety of reasons, but the most common is femoroacetabular impingement, wherein bone spurs on either the femur (ball) or acetabulum (socket) rub on the labrum and cause it to tear.