Knee meniscus injury is a very common cause of knee pain and discomfort, can occur in the knee sprain, car accident injuries and other clear trauma induced, can also occur in the knee chronic strain, especially in welders, masons, car mechanics and other people who need to bend the knee position weight-bearing activities, with social progress, the prevalence of sports, meniscus injuries occurring in sports is particularly common The high incidence of meniscal injuries in another group of people should not be overlooked: tai chi practitioners and square dance participants, who tend to be older and usually did not exercise their knees too much when they were younger, but after middle age as the national fitness boom and the desire to get in good physical and mental condition through exercise The sudden increase in knee weight and activity can make it difficult for the knee to adapt to the sudden increase in load for a short period of time, causing knee meniscus damage. The symptoms of knee meniscus injury are mainly pain, but also often accompanied by knee popping, playing soft leg or even interlocking, some patients appear to have limited knee extension, while the knee can not be overflexed, squatting is also one of the most common symptoms. In the acute phase of meniscal injury, the pain is usually more intense and the knee movement is significantly limited, accompanied by swelling and fluid accumulation in the knee joint. However, after a period of braking and rest, the symptoms can be relieved. When the meniscus rupture is not treated for a long time, complications such as quadriceps atrophy and articular cartilage wear can occur, and in severe cases, joint replacement is required due to severe damage to the articular cartilage.