Viscosupplementation is a therapeutic injection that is frequently used to treat osteoarthritis. Although it was only approved for treatment of mild osteoarthritis of the knee by the FDA in 1997, it has been used in Asia and Europe for years and several preparations of it are available commercially. Viscosupplementation involves injecting a gel-like fluid called hyaluronic acid into the knee joint. This hyaluronic acid is normally found in the synovial fluid that surround healthy joints. It works as a shock absorber and lubricant allowing bones to move smoothly over each other. Those with osteoarthritis have very low amount of it in their joints. By injecting more hyaluronic acid into arthritic joints the hope is joints will be able to move more smoothly, pain will be reduced and functionality increased. There are several different viscosupplements commercially available for treatment of osteoarthritis of the knee. Depending on which product is used, the treatment typically requires a series of injections given one to five times over a few weeks to months. Some may not feel significant improvement until after the first injection or two. The Procedure The procedure is done in the clinic with only local anesthetic. If there is any swelling in the knee, excess fluid will be removed before injecting the hyaluronic acid. The aspiration and the injection are typically done using only one needle although some providers may prefer to use two separate syringes. Movement of the knee is recommended to help disperse the viscosupplement, however, it is recommended that you avoid excessive weight bearing on the leg such as standing for long periods, jogging or heavy lifting for the few days. For those who report pain relief with the procedure, it may take several weeks to notice an improvement. However, for those who do respond, they often find pain relief and improved function for months after the series of injections. If the injections are effective they may be repeated after a period of approximately 6 months. *Individual Result May Vary*