How much correction you gain with surgery has to do with the pre-operative stiffness of the curve and the strength of the bone. This can be determined by the pre-op bending films and a T score from a bone densitometry. You probably do not need a bone density test being a young male.
I do not know if you need an MRI of the lumbar spine but you will need at least a CT scan of your L5-S1 level due to the probable failure of the fusion. Thoracic MRIs normally may not be needed for a scoliosis surgery unless there is a suspected congenital deformity, a compressive lesion or spinal exam findings that make the spinal canal suspect.
I cannot tell you the cost of these surgeries. You can call my scheduling nurse and she may be able to give you some costs.
Dr. Corenman
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.