This book is to provide useful information for clinical diagnosis and treatment of shoulder joint diseases, avoid getting lost and falling into the traps of misdiagnosis and mistreatment. Typical cases are selected from patients with shoulder joint diseases who, despite undergoing minimally invasive arthroscopic surgery, still experience some unfavourable outcomes and adverse events that directly affect postoperative results, and in some cases, even lead to medical disputes. Pitfalls in diagnosis and treatment of shoulder joint diseases are presented, with detailed discussion on countermeasures. It will be a helpful reference for practitioners working in this field.