I had donor bone with my c4-7 ACDF with instrumentation. The neurosurgeon I does not do autographs because he says there are greater risks of complications with the additional incision and bone removal than there are with using donor material, plus the recovery is easier (less pain from not having a second procedure). Based on limited research before the surgery, it appears that the use of donor material is just as safe as using your own. It's been almost a year since my surgery and I've had no problems with the graft.

Hope that helps! I'm sure there are others here that have more knowledge and experience with this issue. Take care and you'll be in my thoughts and prayers!