My right knee had already been replaced, but due to a fall a bone was out of position. Dr. Grayson replaced the prosthesis that was out of place. Truly, I tell you, my new knee is better than my old one ever hoped to be. There was a minimum of pain/discomfort. He kept careful tabs on me and had my PT start right away. My bending percentage is now more than it ever was. I will not hesitate to have him replace my other knee when the time comes!