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A common knee injury, a posterior horn meniscus tear causes pain and swelling in the knee joint, impairing movement and often requiring surgery to correct. Trauma, typically through bending or twisting, and degenerative effects of aging are the two main causes of posterior horn meniscus tears.
Fact
The knee joint has two menisci, which are crescent-shaped wedges of cartilage between the tibia and femur. The posterior horn refers to the back portion of the meniscus.
Function
The menisci act as stabilizers, lubricators and shock absorbers for the knee joint. The posterior horn meniscus, in particular, serves to reduce the overall stress and weight load on the joint.
Effects
A posterior horn meniscus tear causes pain, swelling and instability in the knee joint. A bone-on-bone sensation is often felt when walking.
Diagnosis
The first step in diagnosing a posterior horn meniscus tear is a physical examination, in which the physician applies pressure to bend and straighten the knee. X-rays and MRIs may also be ordered to confirm diagnosis.
Treatment
Small meniscus tears may heal on their own with rest, reduced activities and perhaps the wearing of a knee brace. In more serious instances, surgery is required to mend, reattach or even remove the damaged meniscus.
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