The MCL (medial collateral ligament) is an 8-10 centimeter band of tissue that runs along the inner edge of your knee. It helps keep your knee stable and working properly when you move.

The medial collateral ligament (MCL), also called the superficial medial collateral ligament (sMCL) or tibial collateral ligament (TCL), [1] is one of the major ligaments of the knee. It is on the medial (inner) side of the knee joint and occurs in humans and other primates.

The medial collateral ligament (MCL) is one of four ligaments that keep the knee joint stable. The MCL spans the distance from the end of the femur (thigh bone) to the top of the tibia (shin bone) and is on the inner side of the knee joint.

The medial collateral ligament (MCL) is a flat band of connective tissue that runs from the medial epicondyle of the femur to the medial condyle of the tibia and is one of four major ligaments that supports the knee.

The medial collateral ligament (MCL) is an important structure that provides stability to the inside of your knee. Running from the thigh bone (the femur) to the lower leg bone (the tibia), this ligament prevents the knee from buckling inward into a knock-kneed (valgus) position.