Now Giving Instant Relief And Also Repair Damaged Cartilage. Cartilage is essentially a white shiny material that helps cushion and cover the area where the bones meet the joints. It serves as a lubricating surface as well as a shock absorber. Cartilage damage can be seen as a hole or crater on the otherwise smooth surface of the joint. If left untreated, the joint can become stiff, swollen and painful. Cartilage damage is the most common reason for knee pain. This advanced treatments may repair or restore your damaged cartilage to relieve your joint pain.