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Lateral Meniscus Tear
Each knee joint has two crescent shaped cartilage menisci which cushion and support the knee. They can be injured by twisting or traumatic injury as well as degenerating over time.
Lateral meniscus tear symptoms
Symptoms of a lateral meniscus tear include tenderness and pain around the outside surface of the knee, particularly along the joint line. There is usually swelling which appears within 24 to 48 hours of the injury occurring. Pain will also be felt when bending the knee or squatting down. A doctor or athletic trainer will do a full knee assessment including McMurrays' test to confirm the diagnosis.
Lateral meniscus injury explained
Each knee joint has two crescent-shaped cartilage menisci. These lie on the inside (medial) and outside (lateral) edges of the top of the tibia or shin bone, also known as the tibial plateau. They act as shock absorbers for the knee as well as providing support and stability for the joint. Injuries to either meniscus can prevent normal use of the knee.
The lateral meniscus is less prone to injury than the medial meniscus because it doesnt attach to the lateral ligament in the same way the medial cartilage meniscus attaches to the deeper part of the medial knee ligament. A tear of the lateral meniscus can occur during twisting movements, direct impact to the knee joint, deep squats or due to degeneration of the cartilage in older athletes.
A cartilage meniscus tear can occur happen in different ways and result in different types of injury. Degenerative Changes may lead to edges of the menisci becoming frayed and jagged. A longitudical meniscus tears is a tear that occurs along the length of the meniscus. A bucket handle tear is an exaggerated form of a longitudical tear where a portion of the meniscus becomes detached from the tibia forming a flap that looks like a bucket handle.
Lateral meniscus tear treatment
Treatment for a lateral cartilage tear would initially be conservative meaning the athlete would try the easy simple things first including rest. If this approach doesnt work then a doctor may recommend surgery.
What can the athlete do?
If there is swelling you should apply RICE (Rest, Ice, Compression, Elevation) to the injured knee. Gentle exercises to maintain quadriceps strength, although care should be taken not to aggravate the symptoms. Wear a heat retainer or support. Take a glucosamine / joint healing supplement. See a sports injury specialist or doctor for professional advice on treatment and rehabilitation.
What can a Sports Injury Professional do?
The first aim of the sports injury specialist will be to correctly diagnose the injury. He/she may do this by utilizing specific tests for meniscal tears such as a 'McMurrays' test. Once diagnised the practitioner may consider two different modes of treatment depending on the extent of the injury.
Conservative meniscus tear treatment
This may be indicated in the case of a small tear or a degenerative meniscus and may involve:
Ice, compression and recommendation of NSAIDs e.g. Ibuprofen. Try wearing a knee support or brace if the knee feels unstable. Electrotherapy i.e ultrasound, laser therapy and TENS. Once pain has subsided, exercises to increase range of movement, balance and maintain quadriceps strength may be prescribed. These may include: squating, single calf raises and later, wobble-board techniques.
Lateral meniscus tear surgery
In the event of more severe meniscal tears such as a bucket handle tear, arthroscopic surgical procedures may be necessary to repair the lesion. The aim of surgery is to preserve as much of the meniscus cartilage as possible. The procedure itself will normally invlove stitching of the torn cartilage. The success of the surgery depends not only on the severity of the tear but also on the age and physical condition of the patient. Younger and fitter patients are known to have better outcomes.
Following surgery a rehabilitive exercise program will be outlined for the patient which may include strenghtening and balance training. Full co-operation with the rehabilitive technique will be necessary to maximise recovery. See expert interview with surgeon on knee cartilage surgery.