I've heard very mixed things about stem cell treatment for spinal injuries. In fact, one of the leader/pioneers of that industry, Dr. Neil Riordan, has stated publicly that "we weren't there yet" in terms of how to use stem cells for lower back injuries.
Interesting... my "stem cell" doc who has won multiple awards has great success with back/spine injuries... but that back/spine/ribs* is one region he almost always does with Prolo of all things. *Ribs are a HUGE part of a back/spine treatment.
Needless to say, as someone who typically opts for stem cell, the first time I got my back/spine treated and my doc mentioned Prolo, I was thinking WTF (since stem cell is generally considered the gold standard, then PRP, and Prolo is usually considered the lowest "tier"). My doc mentioned that in his experience, results with Prolo were equal to or better than with stem cell (meaning, NO justification to drill in to one's bone to do a BMAC!). That said, there are ALWAYS exceptions; each patient is different and the spine can be more complex.
For me, the spine was generally pretty darn good and I've never had back pain or injured my back/spine per say; thus, I'm not going to be the best judge of this; but given how my doc's treatments have FIXED, in full, other areas of my body that I had done a number on, I don't doubt his treatments can work miracles for someone with more severe back/spine too.
Bottom Line: I cannot recommend stem cell (non-spine) / prolo (spine) enough! ...and from both my prior and recent experiences: with some HGH thrown in for faster healing!!!
But DO YOUR HOMEWORK: There are other docs in my area who do stem cell/PRP/Prolo (as one of a whole gamut of treatments) and the results are NOT what they are with my doc (not that I can say from personal experience, thank gosh, that those other docs are inferior!); but rather, I've known people who have gone to other docs for mere sprains / stuff that should have been FULLY HEALED (and HEALED BETTER) with my doc... only to continue to have problems / get less than ideal recovery.
If you can find a doc who focuses his/her entire practice around stem cell/prp/prolo (i.e. regenerative injections) that is typically going to be a good sign / much more ideal than a doc that offers stem cell/prp/prolo as ONE of a whole gamut of other treatments. (think specialist VS generalist!!!)