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 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 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) is located on the inner side of your knee, and it’s eight to 10 centimeters in length. It connects your thigh bone (femur) to your shin bone (tibia). Your MCL also provides strength and stability to your knee joint.

The medial collateral ligament (MCL) of the knee is a flat, triangular band on its medial aspect that resists valgus forces. It forms part of the medial capsuloligamentous complex of the knee. The medial collateral ligament measures 8-10 cm in length and has superficial and deep portions 4.