Labrum Definition

A labrum is the ring of cartilage covering the rim of a ball-and-socket joint such as the hip or shoulder. Synovial fluid and the labrum provide lubrication and a smooth surface to assist in the joint’s natural movement.

Joint pain originating in the labrum may be due to degeneration of the labrum, leading to osteoarthritis, or an injury such as a hip labral tear.

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