History of spine osteotomy.- Clinical and radiographic evaluation.- How to determine the levels of osteotomy.- Indications for spinal osteotomy .- Anesthesia for spine osteotomy surgery.- History of Spinal Osteotomy for Thoraco-Lumbar Kyphosis in Ankylosing Spondylitis.- Smith-Peterson osteotomy and Ponte osteotomy.- Pedicle Subtraction Osteotomy (PSO).- Posterior Vertebral Column Resection (VCR) for Complex Spinal Deformities.- Posterior vertebral column decancellation.- Hemivertebrae Excision: Technique for Congenital Spine Deformity.- The Management of Thoracolumbar Kyphotic Deformity in Ankylosing Spondylitis.- Rod Link Reducer Posterior System for Vertebral Column Resection: A Porcine Model.- Proximal and Distal Junctional Fixation Technique.- Optimizing Safety in Spinal Deformity Surgery.- Outcomes of treatment of severe spinal deformity using spinal Outcomes of Treatment of Severe Spinal Deformity Using Spinal Osteotomy.- Preoperative and Postoperative Care Including Use of Halo Gravity Traction.- Functional Evaluation of Spinal Osteotomy.- Neurological deficit after spinal osteotomy.- Revision Surgery following Osteotomy.- Important Research Principles in the field of Spinal Osteotomy.