Peter B, this is not my personal opinion, it is that of the medical community. Consider this link: http://www.espalda.org/english/divul.../rizolisis.asp
At the bottom of the page, it indicates "Even when it is successful, the effect of rhizotomy tends to diminish with time." I've also seen a neurosurgeon who told me the same thing so check with your doctor. The link above also references the selection criteria which are necessary steps and the US guidelines I've read indicate a lesser percent than that article states regarding the elimination of pain. I have several other links book marked discussing the same thing, but I can't locate them at the moment. I'll keep looking for them, but if you Google the subject, I'm sure you'll find them also, and note that I haven't had the RFA done directly to the occipital nerve, only to the facet joint nerves in the hopes it would free up the occipital nerves. Take care.