The meniscus consists of fibrous cartilage and is located in the joint space of the knee, one on the inside and one on the outside. The meniscus is a crescent-shaped fibrous cartilage that fills the joint space between the femur and tibia, with the medial meniscus being “C” shaped and the lateral meniscus being “O” shaped. The structure of meniscus is semi-circular, with a thick outer circumference and a thin, sharp inner edge, which is concave on top and adapts to the femoral condyles, and flat on the bottom and adapts to the tibial plateau, which has the function of cushioning, protecting and stabilizing the knee joint. The special shape of the meniscus and its structure make it have the function of maintaining the stability of the knee joint, cushioning shock, lubricating the joint, and coordinating the flexion, extension and rotation activities of the knee joint. In sports, attention should be paid to the protection of the knee joint to avoid meniscus injury, and when knee pain occurs, it is necessary to consult a doctor in a timely manner, and actively cooperate with the doctor’s diagnosis and treatment.