The meniscus is one of the most vulnerable tissues in the knee joint. Meniscus injuries are most common in young people, and those who engage in strenuous sports and special occupations have a higher chance of tearing their meniscus. Since meniscal injuries can affect the quality of life of patients, physicians caution that daily exercise should be controlled and age-appropriate to prevent meniscal injuries. The meniscus is located between the femoral and tibial condyles and has a stabilizing and shock-absorbing effect on the knee joint. Meniscal tears can occur during daily work, when picking and lifting heavy objects, when standing unsteadily in a hurry to get off a bicycle, or during intense soccer and basketball sports. Long-term squatting or semi-squatting work can also damage the meniscus with severe wear and tear. Meniscus tears are divided into stable and unstable types. Generally, stable meniscus tears can be treated conservatively with physical therapy and medication. Unstable meniscus tears require surgery. The reporter learned that the meniscus is extremely difficult to heal after injury, because its blood supply is extremely poor, most of it is avascular area, only the outer side of the joint capsule near the side of 25-30% of the blood supply, so it is difficult to repair. Dr. Yang told reporters that conservative therapy is generally used for meniscal tears, and minimally invasive arthroscopic surgery is feasible for those whose conservative treatment is ineffective, with microscopic trimming, partial resection and suturing to avoid premature hyperplasia and degeneration of the knee joint after all meniscal injuries are removed. If the meniscal injury is severe, surgery should be performed promptly to avoid aggravating the knee injury. If the knee is damaged, prompt medical attention should be sought. Since meniscal injuries are extremely difficult to heal, Dr. Yang reminds that in order to effectively avoid meniscal injuries, attention should be paid to controlling the intensity of exercise in daily life, and the choice of exercise should be based on age. Those who are not strong in sports should not engage in basketball, soccer, taekwondo and other strenuous sports.