Michael, as you noted from my note to Claudia, my mother had a knee replace- ment. I can't recall her age exactly, but she was in her 60s. She had bad arthritis there. After the joint replacement (rt knee), she didn't have the motivation to exercise it. It hurt a lot and she neveer worked it through. At the same time, her physician had both knee joints replaced and I would talk to him about the progress. His too hurt a lot, but he was determined to get his exercise. He did, and eventually they worked out OK. It seemed to me that the critical factor in their not working for mother was the motivation problem. We tried everything we could think of, a stationary bike, walking with her, sitting exercises, a jacuzzi, etc. In her instance we didn't know that it was PD that she had. Only til much much later did that become recognized. What do you think are the specific considerations in your situation? Bob Newbrough