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Injuries & Diseases of the Lateral Meniscus

According to arthroscopy.com, the knee is one of the most complex joints in the body. It requires stability from several different ligaments to support the upper body and provide multi-directional mobility. The lateral meniscus is a c-shaped cartilage component on the outer side of the knee that protects the tibia and femur from rubbing against each other. Damage in this area creates instability in the joint.

  1. Torn Lateral Mensiscus

    • The lateral meniscus can become torn due to trauma or overuse. The tears can be microscopic or large enough to tear the C-shape meniscus in two. Sports or activities that require twisting or rotating are often a cause of this injury. When twisting is combined with pressure, such as in pivoting to change direction in a football game, the injury may be more severe. However, this is not the only cause of a torn lateral meniscus. Age and degenerative conditions can contribute to a tear in the lateral meniscus. Treatment for a torn meniscus ranges from rest with ice to surgery to repair the tear.

    Cystic Meniscus

    • Degenerative cystic meniscus disease is a condition in which lesions develop in the menisci of the knee. According to PathologyOutlines.com, this disease is most commonly found in the lateral meniscus and can extend beyond the meniscus into the knee joint. As a result, fluid may be released, creating pressure and immobility in the knee. This condition may also be acquired through trauma and can lead to other issues in the knee such as a Baker's cyst, which is a protrusion behind the knee resulting from fluid buildup. Treatment may start with anti-inflammatory medication, but surgery may be required to remove the cyst.

    Osteoarthritis

    • Osteoarthritis is a degenerative joint condition in which cartilage in joints wears down over time. This condition commonly occurs in knees and can lead to excessive wear on the lateral meniscus. Osteoarthritis may develop as a result of aging, chronic injury to the knee or residual scar tissue from surgical procedures. As the lateral meniscus wears, the femur and the tibia have less cushioning between them and can start to grind against each other. Many people living with osteoarthritis manage the pain with ice, anti-inflammatory medications and exercise regimens. In other instances, surgery may be required to rebuild the knee structure.

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