Viscosupplementation is a procedure in which hyaluronic acid is injected into a joint. Hyaluronic acid is a lubricant found in healthy knees, but is reduced in knees with mild to moderate osteoarthritis.
Injections are typically done 1 to 3 times over several weeks, and may provide relief of arthritis symptoms for several months. This can be repeated. It is FDA approved for the knee, but can be used in other joints as well with good results.