Hi GW, good to hear you are improving.
I don't know if it is the same thing or not but... when I had my spinal surgery a few years back, they took a bone graft from my pelvis, mashed it up with something and stuck it inside a titanium cage and inserted that into my spine in the hope that the bone would grow out through the cage and fuse the vertebrae.
Sadly for me it didnt grow quite enough, but I have heard from others that it has been very successful. I would certainly say give it a go, although I'm no expert and don't know your circumstances.
Ps, If it's bone marrow they are taking I'm not sure how painful that is, but bone grafting can hurt a lot - my donor site for my bone graft is still giving me problems 13 years later :'(
Good luck with whichever path you choose, and keep us updated. GWS :-*
