When I had my TKRs back in 2004 and 2006, they used the passive motion machine, but they no longer use it. I never thought to ask my surgeon the other day this question...if a patient requested its use ...would they pull one out of mothballs and let the patient have access to it? I for sure would ask for it. I have a walking project at the retirement facility I live at, where I have measured (with a measuring wheel) my walks and I just past 100 miles! X-rays last week as a followup, show no signs of wear ....yet, anyway. I got to 134 degrees within 2-3 week of surgery with little or no pain. But I understand that they think the machine shortens the life of the replacement.