The lateral collateral ligament (LCL) is the main supporting ligament on the outside of the knee. It provides stability to the joint when the knee is pushed outward. An LCL injury involves the stretching or tearing of this ligament.
There are 3 degrees of lateral collateral ligament injury:
- First-degree injury – mild stretching of the ligament with no looseness
- Second-degree injury – partial tear of the ligament
- Third-degree injury – the ligament is completely torn and the joint is unstable