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 ...

The medial collateral ligament (MCL) is located on the inner aspect, or part, of your knee, but it’s outside the joint itself. Ligaments hold bones together and add stability and strength to a joint.