What is the primary role of the lateral collateral ligament in knee flexion?

What is the primary role of the lateral collateral ligament in knee flexion?

• A. Resists valgus forces
• B. Resists varus forces
• C. Facilitates tibial internal rotation
• D. Supports patellar movement

Answer: (B)

The lateral collateral ligament (LCL) plays a critical role in stabilizing the knee, particularly in relation to varus forces. Varus forces occur when the knee is subjected to pressure that attempts to push the knee inward toward the midline of the body. The LCL attaches from the lateral femur to the head of the fibula, providing support against this inward motion. During knee flexion, the knee joint is in a position that can make it vulnerable to these varus stresses, especially during dynamic activities where balance and weight shifts occur. The LCL helps to resist this lateral stress and maintains the knee's structural integrity by preventing excessive movement in that direction. Therefore, its primary function is to support the knee against varus forces, ensuring smooth and safe movement while engaging in various physical activities.

The lateral collateral ligament (LCL) plays a critical role in stabilizing the knee, particularly in relation to varus forces. Varus forces occur when the knee is subjected to pressure that attempts to push the knee inward toward the midline of the body. The LCL attaches from the lateral femur to the head of the fibula, providing support against this inward motion.

During knee flexion, the knee joint is in a position that can make it vulnerable to these varus stresses, especially during dynamic activities where balance and weight shifts occur. The LCL helps to resist this lateral stress and maintains the knee's structural integrity by preventing excessive movement in that direction. Therefore, its primary function is to support the knee against varus forces, ensuring smooth and safe movement while engaging in various physical activities.