I never thought of the connection, but since the kinee surgery in 02/08 I have had a flare-up of pain and other issues from my immune system taking a hit, which I believe, from the anesthesia. Now I have been experienceing pain in the right butt muscle. the right knee was the one operated on. It comes and goes and now starts to have my leg give out. Could this be related? which specialty would this be? My SS hearing is next month. Thanks much for all the help I have received throughtout the years on this board.