The knee joint relies heavily on the medial collateral ligament and the lateral collateral ligament for support, which means they’re both very susceptible to injury. These joints help brace the knee against unusual movement, as well as control the sideways motion of your knee. While a lateral collateral ligament tear or sprain is less common than injuring your medial collateral ligament, it tends to be a more serious injury due to the complex anatomy of the outer. An injury like this occurs typically during a contact injury in which the inside of the knee is pushed outwards. Surgery is not recommended for this injury unless other ligaments are involved or the ligament is injured in a way that it cannot heal on its own. Ice, bracing, and most important, physical therapy are common treatments. A physical therapist will focus on strengthening the leg muscles and restoring function to the knee.