This Monograph is a compilation of clinical experience and basic research by the author on the function and anatomy of the shoulder joint, with particular emphasis on biomechanics. The book provides deep and comprehensive knowledge about the shoulder based on the author s over forty years of career. This book is unique in that it emphasizes the process of discovering new knowledge through searching for clinical questions or  whys  and solving them. The author shows how he tackled various problems with a great deal of medical curiosity. The chapters place much space on anatomy, function, and pathology, for correct treatment through an accurate understanding of the pathology. The first part of this book explains the basic examination methods as clearly as possible, with abundant figures taken during patient consultations.