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Lateral Collateral Ligament Injury

Lateral Collateral Ligament Injury

Alternate Names

  • LCL injury


The lateral collateral ligament is the main supporting structure on the outside of the knee. It provides stability to the joint when the knee is pushed outward. A lateral collateral ligament (LCL) injury is usually a mild problem.


What are the causes and risks of the injury?

A force applied to the inside of the knee causes this type of injury. This most often happens while playing sports. An LCL injury can also be caused by overuse of the joint, or by a fall in an elderly individual.


What can be done to prevent the injury?

Many LCL injuries cannot be prevented. However, to reduce the risk of injury, a person should be in good physical shape before engaging in sporting activities. Sports safety guidelines for adults, adolescents and children should be followed. Proper stretching exercises should be done prior to athletic activity.


How is the injury recognized?

A healthcare professional can often diagnose the problem based on a physical exam and the person's description of how the injury occurred. Joint X-rays of the knee are usually ordered. A special X-ray called an MRI is used in some cases to reveal the amount of damage and to look for other injuries.


What are the treatments for the injury?

The treatment for LCL injuries depends on the severity of the injury and on the kinds of activities the person is likely to do in the future. RICE, which stands for rest, ice, compression with an ace bandage, and elevation of the leg, is the standard initial treatment.
Medicines, such as the nonsteroidal anti-inflammatory drugs (NSAIDs) ibuprofen (i.e. Advil, Motrin) or naproxen (Naprosyn, Aleve, Anaprox, Naprelan), can be used for pain. Crutches can be helpful until motion and strength in the joint have improved. Occasionally, a brace is used for a few days to immobilize the knee.
The person also needs to do knee exercises to regain flexibility in the joint and strength in the thigh muscle. Physical therapy is sometimes needed to help with this. The individual should also take care to avoid reinjuring the joint before it has completely healed. Surgery may be needed in severe cases where the ligament has been torn and the knee is unstable.

Side Effects

What are the side effects of the treatments?

The knee can be come stiff and weak if it is immobilized for too long. Medicines may cause allergic reactions and stomach upset. Surgery can be complicated by bleeding, infection, or reactions to the anesthesia.

After Treatment

What happens after treatment for the injury?

After proper treatment and rehabilitation, there are usually no long-term effects from a first-degree LCL injury. If treatment and physical therapy go well, a person can often return to normal activities. A person may suffer some mild to moderate long-term knee problems after a second-degree injury. Joint instability may result from a third-degree injury.
The individual is checked to make sure he or she recovers adequate stability and function in the injured knee. The person will also be followed to make sure that the joint is pain free and that strength and mobility have returned. Any new or worsening symptoms should be reported to the healthcare professional.

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