You can have a pseudoarthrosis of the cervical spine and it can be so stable that you would not know it. Along comes a force greater than the pseudoarthrosis can withstand (an impact with another vehicle) and it becomes painful.
Bone spurs that are new are an indication of motion.
I am not sure why you did not fuse as your own bone has a much higher fusion rate but even autograft (your own bone) occasionally does not fuse.
Dr. Corenman
PLEASE REMEMBER, THIS FORUM IS MEANT TO PROVIDE GENERAL INFORMATION ON SPINE ANATOMY, CONDITIONS AND TREATMENTS. TO GET AN ACCURATE DIAGNOSIS, YOU MUST VISIT A QUALIFIED PROFESSIONAL IN PERSON.
Donald Corenman, MD, DC is a highly-regarded spine surgeon, considered an expert in the area of neck and back pain. Trained as both a Medical Doctor and Doctor of Chiropractic, Dr. Corenman earned academic appointments as Clinical Assistant Professor and Assistant Professor of Orthopaedic Surgery at the University of Colorado Health Sciences Center, and his research on spine surgery and rehabilitation has resulted in the publication of multiple peer-reviewed articles and two books.