...and for people that may have no other choices. That said, fusion technology has evolved significantly over the past 100 years (yes, I said one-hundred years), while many other treatment methods have been introduced.
What's the medical director's issue with preserving motion? Does he support any new treatments to help spine patients other than fusion?
BTW: Laurie Todd (Insurance Warrior) gives some good advice about people like this -- it's in her book and in the posts on this site...search with either term. This $20 investment has helped some patients on this site win BACK the cost of their ADR procedure! Not a bad ROI.