The knee joint is the largest flexion-extension joint in the body. Due to its structure, it is not inherently stable. Ligament structures within the knee joint play a significant role in maintaining its normal function and stability. Despite primarily being a hinge joint, the knee joint allows slight gliding and rotation during flexion. Its main functions include bearing weight, transmitting loads, and providing the torque for lower leg movement. Unlike the hip joint, the knee joint is less flexible and is prone to injury due to its central location between the two longest levers in the body, making it susceptible to strains and fractures. Ligament and meniscal injuries are particularly common in sports activities.