I was wonderful how does one get an meniscus tear in the knee also my knee is out of place leaning towards the left what causes this to happen?

Turning, twisting...: turning, twisting , squatting maneuvers are common mechanisms of injury for meniscus tears.As we age the meniscus can become more ' brittle' as it loses its water content and ' degenerative' tears are quite common w/ getting in/ out of a a car and other simple mechanisms.Sounds like you have a valgus( 'knock- kneed')knee and is a normal 'variant', esp.in women.Best of Luck!