Other than the pain you are now suffering I think your Neuro surgeon will suggest a laminectomy.
I can see great results and good long term out come. Saying this only from my over 20 years of my crap but talking to others
when ever I was in hospital, you'll be right, its just a minor scrap/trim of the disc and maybe grind off the spurs
Need to talk just PM
EDIT:: just noticed on the news tonight a break through on back pain, something about injecting the disc with something
Never heard of S1
http://www.paradoja7.com/vertebrae-human-spine/