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Which structure acts as a shock absorber in the knee joint?
Articular facets
Intra-patellar fat pads
Menisci
Infrapatellar and suprapatellar bursae
The correct answer is: Menisci
The menisci play a crucial role in the knee joint by acting as shock absorbers. These C-shaped cartilaginous structures, located between the femur (thigh bone) and tibia (shin bone), help to distribute the load across the knee joint during weight-bearing activities. They enhance stability and provide a cushioning effect that helps to protect the bones from the stresses associated with movement and impact. In addition to shock absorption, the menisci contribute to the congruence of the joint surfaces, allowing for smoother articulation during motion. They also assist in the lubrication of the joint by aiding in the movement of synovial fluid. While other structures listed, such as the articular facets, intra-patellar fat pads, and bursae, have important roles in joint function and stability, they do not specifically serve as the primary shock absorbers like the menisci do.