The meniscus is an important part of the knee joint. It is a sickle-shaped fibrocartilage located between the femur and tibia, and is divided into the medial and lateral meniscus. The lateral meniscus is more mobile, while the medial meniscus is less mobile and vulnerable to injury. The meniscus has a certain degree of elasticity, which can absorb shock, disperse synovial fluid, reduce friction on the joint surface, and maintain joint balance. Meniscus Injury When our legs are flexed and rotated or when the knee joint changes suddenly during movement, the meniscus movement and the knee joint movement are not coordinated, and there is a contradictory movement, then the meniscus will be easily torn. Meniscus injury is mostly caused by trauma, when we are in a semi-squatting position, we suffer a sudden joint inversion and abduction after the rotation of the knee joint, which causes swelling and pain, and the activity is aggravated, especially when squatting or kneeling pain should be highly suspected of meniscus injury, there are also many patients in the early stage of injury is not treated, after a certain period of time, the pain is relieved, but feel that the knee joint is weak and unstable This is also a sign of meniscus injury, such as a weak leg when walking up and down stairs or a popping sound when extending the joint. Therefore, people engaged in sports are more likely to damage the meniscus, such as soccer players, etc. There are also people who work in squatting position for a long time, such as car mechanics, miners, etc. Due to chronic strain injury can also be secondary to meniscal injury, and osteoarthritis in the elderly, due to the degeneration of the meniscus aging can also turn into meniscal injury. If the above symptoms occur in our daily life, especially after obvious trauma, it is recommended to ask the doctor and do the relevant examination, especially MRI examination, in order to confirm the diagnosis, so as not to delay the disease!