Your surgeon is correct regarding the dangers of straightening the kyphosis with the prior infection and surgeries. There is no guarantee that surgery will return your lost function and complications can and do occur. If however, your surgeon is not experienced with osteotomy, he or she might not be the person to see. Maybe a second opinion would be helpful.
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.