Many times there is knee pain because of loss of cartilage or thinning of cartilage for example controversial patella. Cartilage is the lining that protects the bones when they come into contact with each other so when the cartilage is lost or when the cartilage is thin, bones come into contact with bone which causes severe pain. when associated with degeneration this is known as Osteoarthritis and you might need to do a knee replacement but if there is no degeneration and there is no deformity in the knee like variest formality like which happens to Osteoarthritis. Cartilage grafting procedures can be done which helps in restoration of the knee, restoration of the surfaces of the knee. Cartilage restoration procedures are also used in early Osteoarthritis to prevent progression to severe disease.