I have the same diagnosis with my left knee. For some reason most of the cartilage is gone from it. Cortisone injections helped for a bunch of years. Then when those stopped working, I switched to Synvisc injections. They only work for the knee joint. Contact your Dr., you might need to go to an orthopedic Dr. Exercises also help keep the muscles strong around the knee. Riding a bike is one of the best things to do, whether it's stationary or not. It's best to not sit for long periods or stand for long periods of time as well. So no sewing all day at your machine. Good luck!