PREFACE Lumbar degenerative disc disease is one of the most discussed topics in spine surgery. The degeneration is a natural result of aging, and the etiology of the very common symptom, back and leg pain. Problems of diagnosis, indications and the type of surgery are still discussed. This book “Lumbar Degenerative Disc Disease and Dynamic Stabilization” is a very well written text containing answers to those questions. The authors of the textbook stay on the side of dynamic fixation of the spine and find it a very valuable option for the treatment of degenerative disease in comparison to fusion surgery. The authors are from Turkish spine surgeons and also well-known international names. I congratulate the editors Dr.Ali Fahir Özer and Dr.Murat Cosar for creation of this textbook and discussing that very challenging subject. Mehmet Zileli, M.D. Professor of Neurosurgery Past President of the Turkish Neurosurgical Society Past President of the World Spinal Column Society Honorary President of the Middle East Spine Society