"On thing that the surgeon told me right after the surgery was to take the pain meds and stay ahead of the pain. He assured me that I was not going to become addicted, and that I needed to start working the knee right away so that it didn't stiffen up and make the PT more difficult. It worked for me. "

This in spades.....do not get behind pain meds....my wife had it 2 years ago and learned real quick to not do that. She is much tougher than I and thought she could do it drug free...
HAH!
Not gonna happen.

Good luck!