LCL injuries can be grouped into classes. Grade 1 injuries show normal or up to 5 mm of joint space opening with a solid endpoint. A similar solid endpoint is observed with grade 2 injuries, but opening up to 10mm. Grade 3 injuries demonstrate greater than 10 mm of joint space opening and often are associated with other ligament injuries. There are differences in treatment in the classes. With grade I and II injuries, a brace at 45 degrees for 4-6 weeks is enough. Progressive range of motion after 3 weeks as comfort allows enables progression in rehabilitation. But with an injury grade III there is a surgery necessary due to rotational instability, because they usually involve the posterolateral cornor of the knee. After the surgery, you need a brace and physical therapy for prevent the instability.
Periodic evaluations at 2 to 4 weeks are required for operative and nonoperative management