What is the role of cartilaginous structures in the lower extremity?

• A. They stabilize the skeletal frame.
• B. They cushion joints and aid in shock absorption.
• C. They assist in the movement of tendons.
• D. They provide nutrients to the bones.

Answer: (B)

Cartilaginous structures play a crucial role in the functionality of joints within the lower extremity by cushioning the joints and aiding in shock absorption. Cartilage, being a smooth and resilient connective tissue, covers the ends of bones at joints, providing a low-friction surface that facilitates movement. Additionally, it acts as a shock absorber during activities such as walking, running, or jumping, preventing damage that could occur from direct impact and stress on the bones. This protective feature is essential for maintaining joint integrity and overall lower extremity health, helping to reduce wear and tear over time and allowing for smooth, efficient movement.

The other options refer to functions that are either inaccurate or not primarily associated with cartilage. For instance, while stabilization of the skeletal frame is important, this role is predominantly fulfilled by ligaments and muscles rather than cartilage. The movement of tendons is more related to muscle function and their attachment points, while the provision of nutrients to bones is mainly a function of blood supply and the involvement of bone marrow, not cartilage.