You note “Complete fusion of the D12, L1 and L2 vertebral bodies resulting in a gibbus deformity and causing indentation over the conus medullaris as described”.
Tuberculosis (Pott’s Disease) causes erosion of the front of the spine allowing the spine to “get stuck” in the bent forward position (Kyphosis or Gibbus formation). This “bent forward” position tethers the end of the spinal cord (the conus medularis) and causes malfunction of bowel, bladder and leg nerves (“Minor jolt like in left leg, some part of left leg skin sensation is gone. Waist pain most of the time… suffering from constipation which is still increasing…Doctor diagnosed neurogenic bladder as it was found that bladder neck is not opening properly”).
While no guarantees are available from surgery results, it would seem that the better chance of having a more reasonable life might be an osteotomy and refusiom of your deformed thoracolumbar spine. A surgery here is not without some significant risk due to scarring. Try and find a major university program who would agree to see you.
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.