A multitude of leading international authorities provide fresh insights and approaches for patient evaluation and treatment of Anterior knee pain syndrome and patellofemoral instability. Included are new chapters featuring clinical cases and detailed descriptions of the most important surgical techniques used for the knee extensor mechanism, each being described by the surgeon who developed it. The book is divided in four sections, the first section focuses on the etiopathogenic bases, the second section focuses on emerging technologies, the third section includes difficult clinical cases studied, and the fourth section provides a description of the most important surgical techniques for the knee extensor mechanism.