i've had reflex sympathetic dystrophy since August of 1997. over that time i've fallen n had reinjuries in diff. places on my body and now have no probs with it. however i have pinched nerve on my lumbar L4 L5 region n it still hasn't healed i continue to have injections. the RSD however began with surgery on left knee from n old softball injury when i was a kid. i would continue to have flareups that would clearup till the next time i'd bend, turn a certain way whatever n it would cause it to feel as though i had sprang it again. it was the primary surgery that did the lt. knee; thanx linda