Torn meniscus

In the knee joint there are two types of cartilage, articular cartilage and meniscal cartilage. The meniscus is a triangular shaped piece of fibro-cartilage that sits between the femur and tibia. The meniscus can tear as a result of injury or secondary degenerative changes that occur over time. Because the meniscus cartilage dies not have it's own blood supply, tears often need surgery to fix.