The RFA is radio frequency ablation which is the long way of saying rhizotomies. I would recommend this treatment next as long as you had an adequate trial (facet blocks or medial branch blocks that gave you great temporary relief).
Finally, if nothing else is effective, a fusion could be in your future. There are certain appearances on the X-ray and MRI that can indicate a better success rate but your history does indicate you could be a candidate for fusion surgery.
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.