Meniscus injury is not suitable for knee semi-flexion, adduction, or abduction, rotation, gravity compression and other movements. Meniscus is a kind of crescent-shaped fibrous cartilage, filling in the joint space between femur and tibia. There are two menisci in each knee joint, which are divided into medial meniscus and lateral meniscus. The meniscus cooperates with the extension and flexion and rotation of the knee joint. When the knee joint is straightened and flexed, it can move back and forth, and when the knee joint is rotated, the two menisci are one in front of the other, which can easily cause the meniscus to rupture. When the knee is flexed, the contact between the underside of the meniscus and the tibial plateau is relatively fixed, if the knee rotates violently the abrasive force generated by the meniscus will make the meniscus rupture, half-flexion of the knee, inward contraction, or adduction, rotation, gravity extrusion will generate abrasive force, making the meniscus rupture. If you have symptoms of knee discomfort, you need to go to the hospital as soon as possible, the doctor according to the specific conditions, to formulate individualized diagnosis and treatment plan, so as not to delay the condition.