Multiple Choice 2 points Which of the following structures is a fibrous disc that gives the knee the ability to absorb impact? Joint capsule Meniscus Tendon sheath Bursa
The Correct Answer and Explanation is:
The correct answer is Meniscus.
The meniscus is a C-shaped, fibrous cartilage structure located in the knee joint. It functions as a shock absorber, helping to distribute weight evenly across the knee joint during movement. The knee joint is subjected to various forces, especially during physical activities such as walking, running, and jumping. The menisci (there are two in each knee, medial and lateral) play a crucial role in minimizing the impact on the bones by absorbing shocks and reducing friction. This action helps prevent damage to the bones of the joint and supports smooth, efficient movement.
In addition to impact absorption, the meniscus also helps in stabilizing the knee. It improves the fit between the femur (thigh bone) and the tibia (shin bone) and acts as a cushion to prevent direct contact between these bones. The meniscus also aids in load distribution, reducing the pressure on the articular cartilage, which helps in maintaining the overall health of the joint.
While other structures listed in the options play important roles in joint function, they do not specifically serve as impact absorbers in the same way the meniscus does. The joint capsule encases the knee joint and helps in containing synovial fluid, the tendon sheath surrounds tendons to protect them from friction, and bursae are small fluid-filled sacs that reduce friction between tissues. However, none of these structures specifically function as the primary shock-absorbing discs in the knee like the meniscus.
Injury to the meniscus, such as tears, can significantly affect knee function, leading to pain, instability, and a reduced ability to absorb impact. Surgical procedures like meniscectomy (removal of the damaged meniscus) or meniscus repair are sometimes required to address these injuries.
