ALEXANDER R. VACCARO is Professor of Orthopaedics and Neurosurgery at Thomas Jefferson University and the Rothman Institute, Philadelphia, Pennsylvania, and Codirector of the Regional Spinal Cord Injury Center of Delaware Valley. He is also Co-director of the Spine fellowship program and the Spinal Service. Dr Vaccaro has been honored for his research by the American Orthopedic Association, the Cervical Spine Society, and the Eastern Orthopedic Association. He is the recipient of many awards, including the Italien Accademia Europea (2002) and has been awarded the AOA Japanese Traveling Fellowship and the Scoliosis Research Society Traveling Fellowship. He is on the Board of Trustees for the Musculoskeletal Transplant Foundation, the Geoffrey Lance Foundation for Spinal Cord Injury Research and Support, and the American Spinal Injury Association, and a member of countless societies such as the International Society for the Study of the Lumbar Spine, the American College of Physicians and Surgeons, the American Association of Neurologic Surgeons, and the American College of Surgeons. The author of more than 600 book chapters and papers, and over 300 presentations, Dr. Vaccaro serves on Editorial Review Committees for Spine, The Spine Journal, Journal of Bone and Joint Surgery (American and British), The Journal of Neurosurgery Spine, and the Journal of the American Academy of Orthopedic Surgery, among others. Dr. Vaccaro received the M.D. degree from Georgetown University School of Medicine, Washington, D.C. CHRISTOPHER M. BONO is Assistant Professor of Orthopaedic Surgery, Harvard Medical School, and Chief, Orthopaedic Spine Service, Brigham and Women’s Hospital, Boston, Massachusetts. Dr. Bono is also Co-director of the Combined Harvard Orthopaedic Spine Surgery Fellowship at Brigham and Women’s Hospital. A fellow of the American Academy of Orthopaedic Surgeons, and a member of the Spine Arthroplasty Society, the North American Spine Society, and the Orthopaedic Tra