The menisci are two C-shaped pieces of cartilage that sit in your knee between the thigh-bone (femur) and the shin-bone (tibia). This cartilage acts as shock absorbers for your knees; they provide cushioning and also increase the stability of your knees. A meniscal tear occurs when you get a tear in this cartilage.
Meniscal tears can occur either traumatically or with degenerative changes. Traumatic tears often happen with a sudden twist to the knee on a planted foot or by direct contact to the knee. Degenerative meniscal tears generally occur in older people, as the cartilage weakens over time and becomes more prone to tearing.
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