Thanks Gene and Cheryl!
Ya, I have been told by both Clavel and Bierstedt that I'll need a fusion at L5-S1 due to my spondy, it has a fairly decent amount of slippage, so an adr there wouldn't do much unfortunately
I hope I'm making the right choice, as I could have a double fusion (or single fusion done here for free), but when it comes to standard of living and health, I think it would probably be best to have it done right the first time...