Unfortunately, MRIs are unhelpful for interpreting ADRs (artificial disc replacements) due to the large metal mass. The way to interpret ADR dysfunction is with flexion-extension X-rays and a CT scan. I would assume that if the other non-operated levels look “normal” that your problem is with the ADR.
Flexion-extension X-rays are a key piece of information. Does the disc move appropriately and are the endplates intact or had the disc eroded into the endplates or migrated? Most likely, a revision to a fusion will help but more information is needed.
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.