Viscosupplements are used to treat osteoarthritis of the knee. These medications contain hyaluronic acid. When they're injected directly into the knee, the medications help to lubricate and cushion the joint, reducing pain and improving mobility. Viscosupplements are available only in injectable form. Examples include Hymovis (high molecular weight viscoelastic hyaluronan) and Euflexxa (sodium hyaluronate). You can discuss with your healthcare professional to see whether these treatments are right for you.