Only dysplastic (congenital) spondylolisthesis can lead to the complete picture of spondyloptosis. Its therapies are still con- troversially discussed today. The therapeutic palette ranges from therapeutic nihilism to fusion in situ, to complete reduc- tion of the lumbo-sacral junction. The goal of the symposium, which is presented in this book, was to demonstrate the anatomical and biomechanical funda- mental principles which are significant for...