Articular cartilage is a crucial layer of the knee joint which makes movements at the joint painless and fluid like. The important factor that makes it all the more important is its inability to regenerate and make new cartilage.
Like other tissues once the normal architechture is lst, its is replaced by a fiberous or scarred cartilage which does not serve normal purpose. the damage to the cartilage has been divided into stages where 0 stands for least and 4 stands for full thickness cartilage loss. The amount of cartilage loss and the area of loss are important for deciding line of treatment and prognosis of the patient.