The meniscus is a necessary component of the complex biomechanical structure of the knee joint, and an intact meniscal structure is essential for knee function, which has the function of expanding the stress area, absorbing shock, preventing cartilage surface wear, maintaining joint stability, and lubricating the joint. Total or partial removal of the meniscus will lead to early structural and functional degeneration of the knee joint. For a long time, people have been searching for effective treatment methods and approaches after meniscal injury, including meniscal suture, meniscal arrow, meniscal replacement, and meniscal tissue engineering, and discussions have focused on how to preserve the meniscus and what repair methods to take to reconstruct the intact meniscus, but neglected the three early treatments of early diagnosis, early diagnosis, early braking, and early adjunctive treatment based on medical history. However, the three early principles of early diagnosis, early diagnosis, early braking, and early adjuvant therapy were neglected, resulting in meniscal injury obsolescence, expansion, and aggravation of clinical manifestations, which eventually resulted in surgical treatment. Early meniscus injury has a self-repairing function at its wounded edge. The general process of repair is as follows: blood exudates, synovial spikes rich in vascular network cover the fissure, synovial spikes grow into the meniscus, synovial cells, fibroblasts, mesenchymal cells, fill along the edge of the fissure, repair in the form of granulation tissue, turn into dense original connective tissue under certain biological stress, some fibroblasts transform into cartilage The cells synthesize and secrete collagen, glycoprotein-like complexes, form collagen fibers and matrix, and eventually heal with fibrocartilage. The meniscus injury has not attracted the attention of patients and medical personnel, delayed diagnosis, without effective foot-time braking, and the meniscus injury surface obsolescence, trauma edge retraction, vascular degeneration occlusion, all kinds of cell inhibition, so that the trauma edge can not heal, resulting in discontinuity. The main reason is that the meniscus injury area is squeezed by the femoral condyles and tibial plateau, so that the cleft is separated many times. When this squeezing pressure exceeds the bearing force at the junction of the two ends of the cleft, the cleft will be torn again and enlarged, which can make the short cleft become a long cleft and the incomplete fracture develop into a complete fracture, leading to the appearance of new clinical symptoms and signs such as interlocking signs, suggesting that the injury is aggravated and surgical treatment becomes necessary. Suture repair of the meniscus provides a prerequisite for its healing. After suturing, the wound can counteract a certain amount of crushing pressure, which makes the wound edge relatively contact stable and does not lead to an increase in the size of the cleft, and moderate knee movement helps to improve blood flow. Arthroscopic suturing of the meniscus is an active treatment. Advantages: It can determine the diagnosis of the injury, the site and type of injury, estimate the prognosis and time, and promote early functional recovery with early joint movement. Disadvantages: an additional surgical trauma, higher treatment costs, most injuries cannot be sutured (e.g., comminuted meniscus injuries, horizontal fracture injuries, etc.). External fixation of the knee is a passive treatment: advantages, no surgery, economical and painless, does not interfere with or aggravate the knee injury, convenient and easy to perform, and can be applied to meniscal injuries in any situation (including primary care); disadvantages, long external fixation time, no early movement, and difficulty in determining the site and type of injury. Regardless of which of the above two methods of treatment is taken, it is important to recognize the changes in the trabecular margin after meniscal injury, and early diagnosis and early treatment should be given sufficient attention by orthopedic surgeons and patients. However, we have found that after a knee injury, many patients as well as health care providers are often unaware of the accompanying meniscus injury and begin weight-bearing activities before a definitive diagnosis and treatment is obtained. Patients are usually seen 2 months after the injury, by which time they tend to have new signs of increased clinical symptoms such as knee instability, interlocking, and extra-gap bulges, which eventually necessitate surgery. This indicates that early weight-bearing activities can lead to meniscal injury obsolescence, aggravation of the injury, and expansion of the range. Strengthening the awareness of the three early principles of early diagnosis, early braking, and early adjuvant treatment of meniscal injury can significantly increase the diagnosis and cure rate of meniscal injury, avoiding the aggravation of meniscal injury due to wrong diagnosis or treatment plan, and eventually having to remove the meniscus by surgery, which increases the unnecessary burden on individuals, families and society.