A sprain is a joint injury that causes a stretch or tear in a ligament, a strong band of tissue connecting one bone to another. The lateral collateral ligament is located on the outer side of the knee. It attaches the thighbone (femur) to the outside bone in the lower leg (fibula).
Sprains are graded 1, 2, or 3 depending on their severity:
The lateral collateral ligament can be injured by twisting or from getting hit on the inner side of the knee.
Symptoms may include the following:
Your healthcare provider will ask how you injured your knee. He or she will examine your knee for tenderness on the outer side of your knee. He or she will gently move your knee around to see if the joint is stable and if the ligament is stretched or torn. You may have X-rays or an MRI of your knee.
To treat this condition:
You may need surgery to repair a complete tear.
How long it takes to recover depends on your age, health, and if you have had a previous knee injury. Recovery time also depends on the severity of the sprain. A mild sprain may recover within a few weeks, but a severe sprain may take 6 weeks or longer to recover. If the ligament is torn, you may need surgery. If you have surgery to repair a torn ligament, your recovery may take 1 to 3 months. Ask your healthcare provider when you will be able to resume your normal activities.
Everyone recovers from an injury at a different rate. Return to your activities depends on how soon your knee recovers, not by how many days or weeks it has been since your injury has occurred. In general, the longer you have symptoms before you start treatment, the longer it will take to get better. The goal of rehabilitation is to return you to your normal activities as soon as is safely possible. If you return too soon you may worsen your injury.
You may safely return to your normal activities when, starting from the top of the list and progressing to the end, each of the following is true:
Return to your prior level of activity gradually. Talk to your healthcare provider about a knee brace to wear during sports. If pain occurs, contact your healthcare provider and decrease your activity to a pain-free level. If you feel that your knee is giving way or if you develop pain or have swelling in your knee, you should see your healthcare provider.
You may be able to avoid these injuries by having strong thigh and hamstring muscles, as well as by gently stretching your legs before and after exercising. In activities such as skiing, be sure your ski bindings are set correctly by a trained professional so that your skis will release when you fall.