14-Mar-07 9:00 AM CST

Meniscus Tears

Meniscus Tears
   The meniscus is a specialized C-shaped cartilage in the knee. The medial (inner) meniscus and the lateral (outer) meniscus act as a cushion in the knee to prevent the joint cartilage surfaces from grinding against each other. Meniscus tears in young patients are usually caused by a traumatic twisting injury to the knee and may be seen in combination with other ligament and cartilage injuries to the knee. In older patients, the meniscus can tear over time without any specific injury.

How are they diagnosed?
   Signs of meniscus tears include pain on the inner or outer part of the knee, swelling, tenderness, popping, locking, and buckling of the knee. Xrays do not show the meniscus, but they can show fractures, arthritis, or other causes of knee pain. MRI can show tears in the meniscus as well as injuries to the ligaments and tendons around the knee.

How are they treated?
   Arthroscopic surgery is usually recommended for painful meniscus tears. Most tears involve the central part of the meniscus and are treated with removal of the torn portion (partial meniscectomy). Some tears in young patients involve the outer rim of the meniscus and can be repaired with sutures (meniscal repair). Full recovery can usually be expected in 4-6 weeks.