My husband has knee OA but not a surgery candidate yet. He goes to the ortho and gets an injection on Kenalog when needed. The first shot lasted a year with no pain. He went in several months ago now and had the second shot when the shot was less effective at the end of the first year. He just calls for an appointment, gets the shot and walks out. He may need a knee replacement eventually, but at least he's not getting cortisone shots.