Your surgery goes way beyond Bertolotti’s syndrome, which is a sacralization of L5-S1 with a transverse/alar articulation that moves and causes pain (not common). The fusion of L5-S1 (if successful), would have stopped the pain generator. You have had artificial disc replacements (ADR) at L3-5, a revision for a pseudoarthrosis (I assume at L5-S1) and eventually bilateral fusions of your sacroiliac joints. Discograms are designed to determine if an intact disc (not surgically fused or replaced ADR) is a pain generator and your lower 3 discs have been removed. I would be highly auspicious that future surgery will help unless you have an obvious non-union or adjacent segment breakdown at L2-3. My impression is that you have a chronic pain syndrome (based upon very incomplete data) and you need a second (and even third) opinion before further surgery is contemplated.
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.