Osteoarthritis is a condition characterized by the abnormal functioning of the joint cartilage and synovial fluid that causes the rubbing of bones, thereby causing pain, stiffness and loss joint movement. While cure for osteoarthritis has not yet been found, the only management available for this condition is focused on controlling joint pain. Hyalgan works by increasing the synovial fluid in the knee, thus performing 2 purposes: as lubricant and shock absorber.