I had knee revision surgery three years ago. My prosthetic has become dislocated 9 times since then. Each time I can't walk and have to be driven to the nearest emergency room where they put me to sleep with propofol and two or three doctors get on top of me and pull the knee joint back into place. That has happened to me, for example, sitting at my desk or eating in a restaurant. If I move the wrong way, it can cause the pin to get dislocated. My surgeon said that is almost unheard of but there you go. The only option is for a hinge to replace that prosthetic but he says that will cause me more problems. It hasn't happened in more than a year but twice in the last week it has become dislocated but I managed to pop it back into place. I used to walk three miles but can't now and have put on weight. Not sure what to do.