I had two selective spinal nerve root injections for herniated discs, which I have in addition to PN. I would not do it again. My current neuro says knowing what we know about me having PN, (sensory and autonomic small fiber) which we didn't know back when I had the injections, he would not recommend me having them. Again, I am not you, and we are all different, so every decision must be made individually, based on your condition.