The thing I found so interesting when I went thru the replacements is that NOT ONE person I dealt with, including a half dozen PT associates, had experienced a replacement. Their entire wealth of knowledge is what they read in a book. They don't have a clue, same for most of the docs. I found the drug that helped me most was gabupenrtin. Dilaudid worked great for first two weeks, then the oxy was used for two months. They'll never have to worry I'd become addicted to these drugs, hated having to take them, made me feel horrible but it was the only way to work thru the PT. Weaned myself off over 3 days. Hope you're feeling better and able to work out those knees. I hated for the PT folks to massage my knees, I couldn't stand anything to touch my knees for about 6 months. The massaging was the worst in my opinion!