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Lateral Knee Ligament Sprain
A lateral ligament sprain is a knee ligament injury involving a tear to the ligament on the outside of the knee and is most likely following a direct blow to the inside of the knee.
Symptoms of an LCL sprain
Symptoms of a lateral colateral ligament sprain or LCL for short can vary from being very mild to a complete rupture of the ligament. Lateral ligament sprains are categorized into grade 1, grade 2 or grade 3 sprains depending on the extent of the injury.
Grade 1 lateral ligament sprain symptoms include tenderness on the outside of the knee over the ligament. Usually there will be little or no swelling. When the knee is bent to 30 degrees and force applied to the inside of the knee which puts the ligament under stress, pain is felt but there is no joint laxity. See knee assessment for more details.
Grade 2 knee ligament injury symptoms consist of significant tenderness on the outside of the knee over the lateral ligament. Some swelling can be seen over the ligament. When the knee is stressed as for grade 1 symptoms, there is pain and some laxity in the joint, although there is a definite end point indicating the ligament is still intact. In other words the knee cannot be bent sideways completely.
Grade 3 lateral ligament sprain is a complete tear of the ligament. Pain can vary and may be actually less than a grade 2 sprain. When stressing the knee there is significant joint laxity. The athlete may complain of having a very unstable knee.
Lateral knee ligament sprain explained
The lateral ligament or lateral collateral ligament or LCL for short connects the femur or thigh bone to the top of the fibula bone in the lower leg. The ligament itself is a narrow strong cord of collagen fibers and its function is to provide stability to the outside of the knee.
The ligament is most commonly injured in sports by a direct impact to the inner surface of the knee joint, such as by a rugby or a football tackle. A lateral ligament sprain is less common than those affecting the medial collateral ligament which commonly occur as a result of trauma to the outside of the knee.
The ligament is not connected to the lateral meniscus in the joint and so unlike medial ligament injuries, they are not normally associated with meniscal tears. However, injury the anterior cruciate or posterior cruciate ligaments can occur at the same time as a lateral ligament sprain. A full examination once any pain and swelling has gone down is required.
Treatment of a lateral knee ligament injury
Treatment is similar for all knee ligament injuries. If there is swelling apply RICE (Rest, Ice, Compression, Elevation). Discontinue with sport that irritates the injury. Wear a hinged knee brace to support the joint, particularly for grade 2 and 3 injuries.
The initial aim of a health professional will be to assess the extent of the damage. This can be carried out by applying a force to the inner surface of the knee joint and comparing its laxity to the unaffected knee (varus knee test). In more serious cases an MRI scan and / or X-Ray may be necessary. Depending on the severity of the injury a number of treatment options are presented to the clinician.
In grade 1 & 2 tears, conservative methods of treatment are usually preferred. These may need to be be carried out for up to 8 weeks and may include ultrasound or laser treatment, prescription of NSAID's (e.g. Ibuprofen), use of manual techniques such as massage and on a full rehabilitation program, which may include strengthening and proprioceptive and balance exercises. Support taping for the lateral ligaments can help with protection, not just following injury but when returning to normal training.
In grade 3 sprains, particularly when other structures such as the ACL or PCL are damaged, surgery may be needed to prevent future instability. This may involve suturing or stitching the torn ends of the LCL or reconstructing the ligament with a part of a tendon e.g. hamstrings tendon.
Recovery from these injuries is a lot slower than conservative methods and it may be a number of months before the athlete is able to return to sports.