I want rush my recovery , I took real good care of my first replacement and it works real good now( had it in Feb. 2011). I met people in rehab today that are having lots of issues with replacements that were done over a year ago. I certainly don't want that. I have a wonderful Dr. in Nashville tn. that did both of mine an I have had very little pain. My therapist said they get lots of his patients and do they really good, so i will sit back and be patient , my machine will still be there whe i get well.