I find that no X-rays ordered after your surgery to be remarkable. The X-ray is the basic tool for understanding how the ACDF surgery is progressing. Flexion/extension views are the only way to compare stress films to understand how this action affects the fusion. The MRI is a great tool for looking at nerve or cord compression but will do nothing to help with the understanding of a solid fusion.
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.