To my mind, “significant partial osseous incorporation” is most likely a solid fusion meaning a successful immobilization of this level. This would mean that local neck pain generation should not be possible at C5-6. It is interesting to note that he does not comment on the decompression of the spinal canal or nerve roots at C5-6 or at any other level.
This means that either you have pain generation at another level, you still have compression at this level or you have a chronic nerve injury that continues to cause pain even though it has been decompressed. The only way to find this out is to undergo diagnostic testing with facet blocks and nerve root blocks. See here:
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.