The book "Elbow Ulnar Collateral Ligament Injury" offers a comprehensive analysis of the biomechanics, assessment, diagnosis, and treatment of ulnar collateral ligament (UCL) injuries in the elbow. It is aimed at professionals who work with athletes frequently affected by this injury. The thematic structure of the book begins with the anatomy and biomechanics of the ligament and progresses to diagnostics, which includes both physical examination techniques and imaging procedures. A central part of the text is dedicated to conservative and surgical treatment methods, including revision and potential complications. Special chapters are devoted to female athletes and student athletes. Another important aspect is rehabilitation, which places a particular focus on sport-specific approaches. Written and edited by leading experts in the field of orthopedics and sports medicine, this book serves as an essential reference for the diagnosis and treatment of UCL injuries.