JinSong,
I had 3 ADRs S1-L3 and because of my Spondylolisthesis at L3, I had a 360 mobility preservation cage put in.......
http://www.dr-bertagnoli.com/360-mot...n-surgery.html
So far so good but it's really early.......Harrison can probably comment better on this as far as others and long term......
It's an option and Bertagnoli is good on C level.....