The knee, the body's most complex weight-bearing joint, supports core functions such as standing, walking, and exercise. However, due to its delicate structure and the heavy load it bears, it is also highly susceptible to injury. Problems such as ligament tears, meniscus injuries, and tendonitis not only cause pain but can also negatively impact quality of life over the long term. This book, grounded in anatomy, systematically analyzes the types, causes, and rehabilitation of knee injuries. It offers a phased training program, from the acute phase to functional restoration, covering strength development, balance and coordination, nutritional support, and other aspects. It aims to help readers achieve scientific rehabilitation, restore knee function, and return to a healthy lifestyle.