This book has become necessary as a consequence of the rapid expansion of the surgical procedures and implants available for spinal surgery within the "AO Group". We have not attempted to write an in-depth book on spinal surgery, but one which will help the surgeon in the use of AO concepts and implants. We con sider the practical courses held all over the world essential for the teaching of sound techniques so that technical complications and poor results can be avoid ed for both the surg...