Hello, Barbara, I had a unilateral pallidotomy in 1996. It was on my right side so the side that got the most effect was my left. I was having alot of problems with dystonic pain. That problem was relieved entirely on my left side. My right side seems to have been made a little more mobile. My left leg has been considerably slower since operation but that leg has given me trouble for several years before operation. I am glad i had the operation. I have heard that the second side operations carry a higher risks with side effects--could effect speech. I don't know about the validity of this statement. Hope this info- helps - thanks for sharing--------pete