I think knees are harder than hips. My cabal of friends have almost all had at least one knee done - they had a much harder time than I did with my hip. My only advice would be not to over-do it just because the pain is not bad anymore. I went a little overboard the third week and set healing back a bit = I am okay now but it did make pt more painful than it needed to be. I really recommend pt -it helped me a lot. I am still working to get range of motion back but I had been compensating for a number of years