What structure serves as a shock absorber and stabilizes a joint?

The meniscus plays a crucial role in joint function, particularly in the knee. It is a crescent-shaped fibrocartilaginous structure that provides cushioning between the bones of the joint, acting as a shock absorber during weight-bearing activities and movements. By distributing load and providing stability, the meniscus helps prevent injuries and wear on the joint surfaces, enhancing overall joint function and reducing the risk of osteoarthritis.

Each of the other structures serves different functions within the musculoskeletal system. The bursa is a fluid-filled sac that reduces friction between tissues, but it does not provide the same shock-absorbing capabilities as the meniscus. A tendon sheath is a layer that encases tendons, reducing friction as they move, but it does not stabilize the joint itself. The synovial membrane lines the joint capsule and produces synovial fluid, which lubricates the joint but does not directly serve as a shock absorber or stabilizing structure. Thus, the meniscus is specifically designed to provide both shock absorption and stability in joint function.