A knee ligament injury can take place when one or more of the four main knee ligaments get injured. The four main ligament that make up the knee are:
1) Anterior Cruciate Ligament (ACL), 2) Posterior Cruciate Ligament (PCL), 3) Medial Collateral Ligament (MCL), 4) Lateral Collateral Ligament (LCL).
Any four of these ligaments can become injured. A knee ligament injury can vary in severity from a minor stretch, to a partial tear and in the worse case scenario, a full tear. These knee ligament injuries can cause knee pain, swelling, tenderness, bruising, affect the movement in your knee and ultimately prevent normal function, activity or sport participation.