Acetabular labrum: A ring of fibrocartilage (fibrous cartilage) that runs around the acetabulum (cup) of the hip joint and increases its depth. The head of the femur (the bone in the thigh) fits in the acetabulum. The labrum deepens this cavity and effectively increases the surface (and strength) of the hip joint.
Signs and symptoms of a acetabular labrum injury include pain accompanying hip motion, occasional pain in the hip at night or during daily activities, decreased range of motion and loss of strength in the hip.
In medicine, a labrum is a ring of fibrocartilage around the edge of the articular (joint) surface of a bone. The Latin "labrum" means "lip." The term is used generally to designate a lip, edge, or brim. Plural, labra.