First of all, it is important to know that there is a medial and lateral meniscus, which means that there are two menisci in a knee joint, and that the shape of the medial and lateral menisci is different. Figuratively speaking, the meniscus is a “gasket” between the femur and tibia that acts as a cushion, but of course, the meniscus does more than that. The lower end of the femur and the upper end of the tibia are covered with hyaline cartilage, forming the tibiofemoral joint. The cartilage surface of the joint is a dense and very smooth material that allows the joint surfaces to slide against each other without wearing out. The presence of the meniscus not only makes the joint surfaces more compatible with each other in shape, but also distributes the stresses transmitted from top to bottom during human activity evenly, preventing excessive stresses from being concentrated in one area of the joint surface. Without the meniscus, stresses are concentrated in a small area of the joint surface, which over time can lead to degeneration of the joint. The meniscus also contributes to the stability of the knee joint. The meniscus covers the surface of the tibia forming a shallow fossa that fits into the rounded shape of the lower femur, and a fossa-shaped structure is obviously more stable than a flat surface. Without the meniscus, the rounded lower end of the femur could slide at will on the flat tibial surface and the stability of the knee joint would be greatly compromised. In conclusion, the meniscus has the role of bearing load, absorbing shock, and increasing the stability of the knee joint, and in this words also has the role of lubrication and proprioception.