well david
one problem with the fusion is healing time its much greater.and the possbily of a non fusion
althou you are correct in maken the statement about there not being much movement at s1-l5. the other question is and i didnt think much about it before is how much disc height have you lost? as i was bone to bone and i have had god awefull leg pain since about 5 days after surgery it just keeps going day after day its now been going on 9 weeks postop.
but is getting better. thank god.now my room mate in germany was larry he is 26 and didnt have much lost and at 6 weeks postop he only has muscle pain from PT. and i was running cirles arround him in the hospital as apossed to now where im praying to be able to return to work at 12 weeks. you have a tough call. but if you go to dr b cost diff isnt going to be much diff from two adr or adr and a fusion. the charge for the device was 4500 euro.
good luck to you in which ever route you take.
chuck