Isthmic spondylolisthesis lower back pain generally emanates from the disc and the pars fractures. Leg pain originates from the foraminal stenosis. Radio frequency ablation generally does not yield relief. I cannot count how many patients have come into my office after having this procedure without relief.
In my opinion, based upon your history and symptoms, you will need surgery for stabilization of this level. The most typical surgery is a TLIF. See the website for a description.
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.