The lateral collateral ligament (LCL) is the other main ligament on the outside of the knee joint. This ligament also helps to limit the amount the knee moves from side to side.
If you feel that you may have a knee ligament injury, you should see a doctor. Your doctor will usually start by asking you questions about the injury, what happened and where you are feeling any pain. They may then examine your knee to look for signs of swelling of your knee joint. They may also move your leg into different positions to test your knee ligaments. From this examination, they may be able to get an idea of the possible injury that you have.
If your doctor is concerned that you may have a more serious knee ligament injury, they may refer you for further tests such as an ultrasound scan or an MRI scan. Such tests should be able to show up any tears or rupture of your ligaments. Sometimes, an X-ray of your knee may be suggested.