The Medial Collateral ligament (MCL) is a ligament that runs along the inside of your knee. It can be injured with twisting movements that can lead to symptoms of instability, pain and giving way. The best way to diagnose an MCL injury is to seek an assessment by a Chartered Physiotherapist. They can diagnose the injury and differentiate the problem from other possible causes. Hinged Knee Supports can help reinforce and protect the MCL after injury.