Bridwell and DeWald’s Textbook of Spinal Surgery Fourth Edition • Volume 1 • Volume 2 Editors in Chief M C. G UNISH UPTA Mildred B. Simon Distinguished Professor of Orthopaedic Surgery Professor, Neurological Surgery Co-Director, Pediatric and Adult Spinal Deformity Service Department of Orthopaedic Surgery Washington University School of Medicine St. Louis, Missouri K H. B EITH RIDWELL J. Albert Key Distinguished Professor of Orthopaedic Surgery Professor, Neurological Surgery Founder, Pediatric/Adult Spinal Deformity Service Founder, Washington University Spine Fellowship Department of Orthopaedic Surgery Washington University School of Medicine St. Louis, Missouri Associate Editors Paul A. Anderson Peter D. Angevine Barrett S. Boody Jacob M. Buchowski Kenneth M.C. Cheung Bryan W. Cunningham Christopher L. Hamill Michael P. Kelly John M. Rhee Paul D. Sponseller Alexander R. Vaccaro Jeffrey C. Wang Burt Yaszay Lukas P. 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Contributing Authors Kariman Abelin-Genevois, MD, PhD Centre Medico Chirurgical des Massues-Croix Rouge Francaise CMCR Des Massues Croix Rouge Francaise Service de Chirurgie Rachidienne Lyon, France Oussama Abousamra, MD Assistant Professor, Orthopaedic Surgery Children’s Hospital Los Angeles University of Southern California Los Angeles, California Kuniyoshi Abumi, MD, Dr Med Sci Director in Chief Center for Spinal Disorders Sapporo Orthopaedic Hospital Sapporo, Japan Owoicho Adogwa, MD, MPH Clinical Fellow and Instructor Department of Orthopedic Surgery Washington University School of Medicine St. Louis, Missouri Michael C. Ain, MD Professor, Orthopedics Johns Hopkins Hospital and Health System Owings Mills, Maryland Remi M. Ajiboye, MD Spine Surgeon Sports and Spine Orthopedics Los Angeles, California Muhammad Ali Akbar, MD, PhD Candidate Resident Division of Neurosurgery University of Toronto Toronto, Ontario Behrooz A. Akbarnia, MD Clinical Professor, Orthopedic Surgery University of California San Diego San Diego, California Todd J. Albert, MD Surgeon-in-Chief and Medical Director, Orthopedic Surgery Hospital for Special Surgery New York, New York Vincent J. Alentado, MD Neurological Surgery Resident Indiana University School of Medicine Indianapolis, Indiana Howard S. An, MD Professor, Orthopedic Surgery Rush University Medical Center Chicago, Illinois Neel Anand, MD Professor of Orthopedic Surgery Department of Orthopedic Surgery Minimally Invasive Spine Surgery Director, Spine Trauma Spine Center Cedars-Sinai Medical Center Los Angeles, California Paul A. Anderson, MD Professor, Orthopedic Surgery Orthopedic Surgery and Rehabilitation University of Wisconsin–Madison Madison, Wisconsin Peter D. Angevine, MD, MPH Assistant Professor, Neurological Surgery Columbia University College of Physicians and Surgeons New York, New York M. Darryl Antonacci, MD Spine Surgeon Institute for Spine and Scoliosis Lawrenceville, New Jersey Jetan H. Badhiwala, MD Resident Physician Division of Neurosurgery University of Toronto Toronto, Ontario Ori Barzilai, MD Assistant Attending, Neurosurgery Memorial Sloan Kettering Cancer Center New York, New York Jennifer M. Bauer, MD, MS Assistant Professor, Orthopedic Surgery Seattle Children’s Hospital University of Washington Seattle, Washington Carlo Bellabarba, MD Chief of Orthopaedics Harborview Medical Center Professor and Vice Chair, Department of Orthopedics & Sports Medicine Joint Professor, Department of Neurological Surgery University of Washington School of Medicine Seattle, Washington Chase Bennett, MD Spine Surgeon Novant Health Brain & Spine Surgery Winston-Salem, North Carolina James T. Bennett, MD Clinical Instructor Pediatric Orthopaedic Surgery Children’s Hospital Los Angeles Los Angeles, California Clara Berlin, MD Resident for Orthopedics and Spine Surgery Departement of Spine Surgery with Scoliosis Center Schön Clinic Neustadt i.H. Neustadt in Holstein, Germany Mark Bernhardt, MD Chairman & Rex L Diveley Professor Orthopedic Surgery University of Missouri-Kansas City Kansas City, Missouri John Berry-Candelario, MD, MPH Neurosurgery/Spine Oncology Fellow Memorial Sloan Kettering Cancer Center New York, New York Sigurd Berven, MD Professor in Residence Chief, Spine Service Department of Orthopaedic Surgery UC San Francisco San Francisco, California Randal R. Betz, MD Pediatric Scoliosis and Spine Surgeon Institute for Spine and Scoliosis Lawrenceville, New Jersey Mark H. Bilsky, MD