Ive had 2 of them. The 1st gave me 9 months probably 5o% pain reduction. The 2nd didnt get much benefit. Had neck problems after the 2nd that have only gotten worse, and now the RSD has spread to my L neck & L jaw, with major jaw/neck issues. It sux!! Knowing what I know now, the nerve rhizotomy causes "trauma" to whatever nerve....so theres a good chance of spreading, and I doubt your Doc will tell u this.