I've not heard of this being done with a local!

One of my friends had a full knee replacement last July 27th. She was in hospital 2 weeks, then in Rehab for 3 weeks, then home with PT for another few weeks (I don't recall how long). She had to use a CPM machine - constant passive motion - machine. This started the 2d day after surgery and as long as she was in the hospital, and in the Rehab she had to use it two hours, three times a day. She did not have the machine at home. Here is a link:
http://www.youtube.com/watch?v=uSgJV986Knc

The machine prevents a build up of scar tissue. IT starts with a gentle motion at 15% range of motion, and each day they add more movement to it.

She really credits this machine (along with all the other PT etc) for how well and how quickly she healed. She now has full range of motion and is pain free after 4 years of incredible pain (she put off the surgery quite awhile).

Best wishes to you!