Arthritis is a condition of diseased cartilage (not bone). Cartilage covers the ends of all bones involving a joint. This cartilage coating allows the bones to glide over one another. When this surface coating starts to wear thin, or wear out—arthritis sets in. Unfortunately, cartilage is unique in that it cannot regenerate like bone, hair, skin, etc. Arthritis is a progressive degenerative joint disease with no current mechanism to reverse its damage. READ MORE