@sallylang Its exactly what I said in the message. Done by anathesiologists primarily. They use an adapter to make a hole/space. Screw it in, then tighten to your vertabrae. Spreads the vertabrae out so it does not pinch a nerve which causes the pain. This instead of scraping the inside of vertabrae so it doesn't pinch the nerve. Go to, You Tube. Search Spinal Simplicity - Minuteman G5. Lots of videos on it.