It sounds like you need to get another opinion from another spine surgeon that also does ADR.
Do you have a copy of the written report on your mylogram? Could there be a different interpretation between your doctor and the radiologist reading?
I don't know a whole lot about ADR other than what I have read about them on line, but have read that problems can occur if the wrong size was used or if they are not perfectly line up.
I wonder if either of those are a possibility for you?
I wonder if the term "Pristine" being used by your doctor to describe the Myleogram is only in reference to the ADR and your doctor is ignoring anything else that could be showing.
Did your doctor you BMP with your bone grafts? There have been many reports of excess bone growth caused by BMP.
Could that be a problem and excess bone is pressing on the nerves 10 months post op?
I wonder if it would be a good idea to have an MRI done as well?
In any event, it is time for you to get a second opinion. Whatever the reason for your pain, your present doctor based on your post, doesn't know what is causing it and is just filling you with pain meds, not doing anything further to determine the cause.
Get all your test results, pre and post op, your myelogram results, your operative reports etc. and go see another spine surgeon that does ADR and see what a fresh set of eyes will say.
Good luck
Fran