When Dave had his first set of cervical xrays done at 4 months, the Dr. was very happy with the fusion. He left a message (at 10 p.m last night that I erased by mistake) saying that the 10 month xrays show incomplete fusion and that he needs more xrays in 3 months.
He had a 2 level ACDF. He doesn't smoke. He doesn't take motrin. He is 58.
What could cause him to not fuse completely?