The Dr. wouldn't do both of DH's knees at once but he had them done within a yr of each other. Did great with one and not so good on the other. Bad one first and then changed Dr. Do all of the rehab and every exercise they give you. Walk as much as possible and I'm sure it will be fine. They have come so far with all of this. He's in such better shape now and you'll be grateful you did it.