Osteoarthritis of the knee is a common and prevalent disease among middle-aged and elderly people. Based on his years of clinical experience, professor Wang Chunlin, who specializes in the theory of tendons and bones, believes that tendon injuries can damage bones, and damaged bones can also injure tendons. He emphasizes the importance of both tendons and bones, treating the tendons throughout the process, and uses the "stretching and loosening method" to treat knee osteoarthritis, which is divided into three steps: loosening the tendons to untie knots, moving the bones to correct deviations, and strengthening the tendons to protect the bones. At the same time, he takes a holistic approach, combining prevention and treatment, and pays attention to the supplementation of liver and kidney Qi and blood, with internal and external treatments combined to achieve the state of bones straight and tendons flexible, with Qi and blood flowing smoothly. This method has significant clinical effects and provides objective evidence for the techniques through basic research. An example of a medical case is included in the article.