what is an mcl tear
MCL Tear. An MCL tear is where the medial collateral ligament on the inner side of the knee gets overstretched and damaged. It is most commonly caused by a sudden twisting force through the knee, which damages some or all the fibres of the ligament.It can lead to swelling, pain and instability.n MCL tear is where the medial collateral ligament on the inner side of the knee gets overstretched and damaged. It is most commonly caused by a sudden twisting force through the knee, which damages some or all the fibres of the ligament. It can lead to swelling, pain and instability.