[So sorry to hear about you needing knee replacement, and not being able to do it. I am in your same boat. I have three torn tendons in left foot including the archilles. this colapsed my foot. I can't have the repair because of the RSD either. Won't touch me. I do limp, and use a new lotion for the RSD that helps. Was so mad about all of it, I asked to be weaned off all narcotic, to try this lotion. It wasn't helping the foot colapse or the RSD. I guess with both of us, it is better to be safe than sorry. I don't think either of us really know what the future will bring unless they find a cure for the RSD. I will keep you in my thought and prayers. ginnie