Which structure acts as a cushion between the femur and tibia in the knee?

The menisci are two crescent-shaped fibrocartilaginous structures located between the femur and tibia in the knee joint. Their primary role is to act as a cushion, providing shock absorption during weight-bearing activities. This cushioning function helps to distribute the load across the knee joint and protect the underlying bone surfaces from stress and injury during movement, such as walking, running, or jumping.

Additionally, the menisci enhance the stability of the knee joint by improving the fit between the femur and tibia. They also play a role in joint lubrication and nutrition by facilitating the movement of synovial fluid, which nourishes and lubricates the cartilage and other tissues within the joint.

Articular cartilage, while it does cover the ends of the femur and tibia to reduce friction, lacks the shock-absorbing properties of the menisci. The patella, or kneecap, is a bone that protects the knee joint but does not function as a cushion in the same way as the menisci. Synovial fluid provides lubrication and nourishes the joint but does not serve as a physical cushion between the bones.

Thus, the menisci are the correct answer as they specifically provide the essential cushioning function within the knee