Cartilage damage occurs in all types of arthritis, focal loss of blood supply, and injuries in which patient complain of pain, stiffness, swelling and difficulty in performing daily activities. All the structures around the knee joint can get damaged due to aging, sports injury, accident etc. Ligament and meniscus damage can occur following injury by twisting and angular forces. Meniscus injury causes locking of knee apart from pain, swelling and stiffness. Ligament injury causes instability and giving way.