To Allow For Flexion, The Quadriceps Unlocks The Knee Joint

The knee joint is an incredible joint that is designed to provide stability and a wide range of motion. In order for the knee joint to be able to flex, it must first be unlocked by the quadriceps muscle group. The quadriceps, or quad muscles, are four large muscles located in the front of the thigh.

The primary purpose of the quadriceps is to act as the main extensor muscles of the knee. This means they are responsible for extending the knee joint, allowing us to stand and walk. In order for the knee to flex, or move in the opposite direction, the quadriceps must first relax and unlock the knee joint.

Flexion of the knee occurs when the lower leg and foot are raised posteriorly at the knee joint. This action is made possible by the hamstring muscles located in the back of the thigh. The hamstring muscles work in opposition to the quadriceps, and as the quadriceps relax, they unlock the knee joint allowing the hamstring muscles to bend and flex the knee.

The knee joint is an incredible joint that can move both forwards and backwards as well as rotate. It requires cooperation between the quadriceps and hamstring muscles, as well as other muscles and ligaments. To allow for flexion, the quadriceps unlocks the knee joint, allowing the hamstring muscles to take over and bend the knee joint.