What role do fibrocartilage structures such as disks, menisci, and labrums play in joints?

• A. Nerve endings abundant
• B. Blood supply abundant
• C. Primary energy source
• D. Shock absorbers and improve congruency

Answer: (D)

Fibrocartilage structures in joints act as shock absorbers and improve congruency between articulating surfaces. By distributing load over a larger area, they reduce peak stresses on the cartilage and help the surfaces fit together more smoothly during movement. This improves joint stability and allows for more efficient motion. In the knee, the menisci spread load between femur and tibia; in the shoulder and hip, the labrum deepens the socket to enhance stability and seal in lubrication. These tissues are tough and designed to handle compression and shear, but they have limited blood supply and nerve innervation, which is why they aren’t energy sources and injuries don’t heal quickly.