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. Knee extension increases the angle between your thigh and the lower leg and occurs when you straighten your leg, and is necessary to stand up, climb steps, or kick a ball. Electromyographic (EMG) activity was recorded in 10 muscles during the concentric and eccentric contraction phase of a knee extension exercise performed with elastic tubing and in training machine and normalized to maximal voluntary isometric contraction (MVC) EMG (nEMG). The muscles that affect the knee’s movement run along the thigh and calf. Extension (bringing thigh behind body) Produced by the gluteus maximus, adductor magnus, and biceps femoris. It also allows limited medial rotation in a flexed position and in the last stage of extension, as well as lateral rotation when “unlocking” and flexing the knee. Tendons attach the muscles to each other. This superficial muscle covers a large part of the posterior thorax. Below are some anatomic terms doctors use to describe location (as applied to the knee): 1. The patellar tendon on the front of the knee is part of the quadriceps mechanism. The rectus femoris is the only quad muscle that crosses two joints: the hip and the knee. So the leg extension machine, because it isolates the quads and eliminates other muscles’ involvement, plays a critical role in rehab. hamstrings. Muscles propel the knee joint back and forth. Standing hamstring curls. Knee strengthening exercises for seniors and the elderly are important for maintaining balance and avoiding falls. For knee extension the muscles involved are quadriceps. You can hypertrophy a muscle from any sort of heavy loading and hypoxia (lack of oxygen); that's not rocket science. The knee is vulnerable to injury and to the development of osteoarthritis. They include the hamstrings and gastrocnemius at the back, which bend (flex) then knee. Anterior Muscles of the Thigh The knee joint allows for flexion and extension of the leg as well as a certain degree of internal rotation and external rotation. Anatomical termsallow us to describe the body and body motions more precisely. They are made of four individual muscles; rectus femoris, vastus intermedius, vastus lateralis, and vastus medialis. Written by the Healthline Editorial Team. Muscles that generate movement across the knee are mainly located in the thigh and can be split into anterior and posterior compartments. Extending along the anterior surface of the thigh are the four muscles of the quadriceps femoris group … This is a group of four muscles: (vastus lateralis, vastus intermedius, vastus medialis, and rectus femoris) located on the front of the thigh. Physical therapy and knee braces also can help relieve knee pain. It is important to try to keep your swelling down after surgery. 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