My husband Dick had a total knee replacement in June of l995. Though the operation was a roaring success, it was shortly thereafter we bagan to notice the changes in his posture, behavior, tremor, etc. that were finally diagnosed as P.D. one year later. If there a possibility that the PD was there lurking and the anesthesia for the surgery was some kind of a trigger? thanks for any thoughts on this. Dorothy, cg for Dick 74/1+ in gorgeous Central New York