This comprehensive text is the most current and definitive source for information related to the care of adult and pediatric patients with spondylolisthesis.  It contains a complete analysis of this common, yet intricate spinal condition, including basic science, diagnosis, non-surgical management, surgical techniques (including minimally invasive options) and outcomes. The management of the various types of spondylolisthesis requires a thorough understanding of both fundamental principles and subtle nuances, which are highlighted here in three sections. Part I details the basic principles, diagnosis and non-surgical management of spondylolisthesis