The meniscus is 2 crescent-shaped fibrocartilages that lie on the medial and lateral articular surfaces of the tibial plateau. Its cross-section is triangular in shape, thick on the outside and thin on the inside, slightly concave on top so as to conform to the femoral condyles and flat on the bottom, where it abuts the tibial plateau. Such a structure precisely allows the femoral condyles to form a deeper depression in the tibial plateau, thus increasing the stability of the spherical femoral condyles to the tibial plateau. The anterior and posterior ends of the meniscus attach to the middle non-articular surface of the tibial plateau, anterior and posterior to the intercondylar spine, respectively. This area can also be referred to as the anterior and posterior angles of the meniscus. When not bearing weight, the tibia and femur are not in contact and the meniscus is lined between them. During weight bearing, approximately 70% of the weight bearing area is on the meniscus, which greatly reduces the stress on the tibial plateau and thus protects the cartilage. The function of the meniscus is therefore primarily to bear weight, maintain coordination of knee motion, maintain stability and absorb shock. The meniscus has its own characteristics in terms of blood flow, with the outer third of the meniscus being more vascular (red zone), while the middle third has only few capillaries (red-white zone) and the medial side is bloodless (white zone). Red zone injury is the part of the meniscus that is relatively on the outer side, adjacent to the joint capsule, and rich in blood supply. The white zone injury is the free edge of the meniscus, which is less likely to heal on its own than the medial part, and usually requires arthroscopic surgery. Regardless of the location and the extent of the injury, strict rest and braking is required, and too much activity is detrimental to the repair of the injured meniscus.