Do the therapy and stick to it...
Len,
My wife's doctor told her he could replace her knee but if she didn't do the therapy all she would have is a new knee that still hurt and wouldn't function properly. She had some wonderful in house visits by a therapist and then several sessions at the office. Plus I had my whip and chair nearby if needed - it wasn't! Doc said most folks make it to about 90% to 100% as far as bending the knee and they like to see about 110% or better. My wife made it to 130%! Good luck with the surgery but that's the easy part of the battle. Be looking for more on stream photos in a couple of months. :D