Starting with the anatomy of the bones and soft tissues of the knee, this book explains in detail the biomechanical principles of ACL rupture and the repair limitations of meniscus injury, and builds a closed-loop system of "injury pathology - emergency treatment - imaging diagnosis - drug intervention - physical therapy". For special groups such as teenagers, the elderly, and obese people, a phased rehabilitation training program is provided, integrating Western medical rehabilitation technology with traditional Chinese medicine acupuncture and exercise training, and ultimately forming a full-cycle management guide from daily protection to sports injury prevention, helping readers to scientifically protect knee health.