The meniscus of the knee is located between the femoral condyle and the tibial plateau and plays a vital role in the knee joint. The following is a detailed description of the role of the meniscus. First, weight-bearing function: It can relieve the pressure of gravity on the tibial plateau, especially in the case of weight-bearing, and play a role in protecting the articular cartilage. Second, to maintain the coordination and stability of the knee joint movement: in the process of knee movement, due to the existence of the meniscus, it can maintain the geometry of the knee joint, with the assistance of the cruciate ligament in the knee joint, not to appear tibial displacement, which plays an important role in maintaining the stability of the joint. Thirdly, cushioning: it can cushion the knee joint pressure under weight bearing or when the knee joint is over flexed or straightened, absorbing the shock generated by the movement and avoiding injury. Fourth, the role of lubrication: meniscus and lubrication of the joint and other functions, meniscus surface uniform distribution of a layer of synovial membrane, to provide lubrication for the joint, so that the friction coefficient of the joint is greatly reduced. Fifth, the role of nutrition: when bearing weight, the meniscus will be rich in nutrient synovial fluid squeezed into the joint cavity, into the joint cartilage matrix, to provide nutritional role for the joint. Since the meniscus of the knee is easily damaged by various causes, especially chronic strain, this has a more serious impact on the function of the knee joint, and can even affect the function of the knee joint, so you should pay attention to protecting the meniscus of the knee joint. In general, the function of the meniscus is to stabilize the knee joint, relieve the load on the knee joint, and promote intra-articular nutrition.