Capt. Steve,
I had total knee replacement surgery on March 3, 2012. I did physical therapy at a rehab center, two-hours a day, four days a week, for 5 months and finally got my right knee to bend 120 degrees.
The only thing I can add to what others said, is that you get out of physical therapy what you put into it. Do all the exercises that they tell you to do. I used a "Stretch Out Strap" made by DKSA every day while sitting on the couch watching TV.
The only things I notice now is it's hard to kneel on my right knee and a pair of cowboy boots that use to fit me, no longer do.
My orthopedic surgeon told me that it takes up to one year for the knee to totally heal after surgery.
I have no problems climbing ladders to get into my treestands while hunting and the arthritc pain is now gone for the knee. The only thing I was told not to do is RUN; I have no problem hiking three miles with a 50 pound pack right now.
Good luck with the surgery!

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"Life is short, hunt hard"