The knee has three layers of cartilage. There is lining or articular cartilage on both sides of the bone. In between the articular cartilage (like meat in the sandwich) is floating or meniscal cartilage. There are two menisci, the medial (inside) and lateral (outside).
When injured, the articular cartilage tends to wear, whereas the meniscal cartilage tends to tear. Meniscal tears can be treated with a knee arthroscope .
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