An accurate diagnosis is the foundation of Good Medical Practice. The inspiration for this work has been to pull together the diagnostic knowledge, skills, and wisdom gathered over generations by the orthopaedic fraternity practising common sense orthopaedics. The relevance and need of such common sense-based clinical practice has been amplifed by the pressures faced by the chaotic Internet information boom, easy access to radiology, corporatization of medical care, and the rapid pace of our life demanding binary answers to complex questions. In routine clinical practice, the diagnosis of a particular shoulder condition is best made on history, clinical examination, and special tests, usually with the help of radiological investigations. It is often the case that all these subcomponents are to be used in conjunction with each other as “clusters” rather than in isolation. Current textbooks are focused on physical examination techniques or radiological examination and do not take into account this cluster approach one needs to use in everyday practice. The purpose of this book is to bridge this gap and serve as a practical guide to diagnosis in modern day clinical practice.