What is the meniscus? The meniscus is a pair of cartilage-like structures within the knee joint, divided into the medial and lateral sides, forming a cushion in the middle of the calf and thigh bones, in the shape of a crescent. It has two main functions: to stabilize the knee joint and to cushion the impact of leg movements. If the meniscus is damaged or lost, the knee joint will be subjected to excessive pressure, and the meniscus can even become a structure stuck in the middle of the joint, impeding the movement of the joint, which can cause severe pain when the knee joint is bent. Who is prone to meniscus injury? First, young people who love sports. When the knee joint is subjected to excessive impact or shearing forces from a sprained joint, the meniscus may tear and produce a traumatic meniscal injury. For example, when playing basketball or badminton, a sharp turn and stop, a strong impact on the knee due to external forces, a sprain when bouncing in place, etc. Of course, meniscus injury is not only the preserve of young people, but also the middle-aged and elderly people should not be ignored. As we age, the meniscus naturally degenerates and strains under long-term activity, which can cause meniscal tears if we are not careful, if we move too much or if we sprain slightly. Therefore, do not think that knee pain is arthritis, in fact, there may be meniscus injury. What are the general symptoms of meniscus injury? First, it hurts. Pain is felt when squatting and standing up. Second, it will ring. When the joint is in motion, there will be the “click” sound of pressing a ball point pen. Third, it will be stuck. When going up and down stairs, the knee will not be able to move, and it will not be able to bend or straighten. If any of these conditions occur in your daily life, it is recommended that you seek medical attention as soon as possible to identify the cause of the condition and to take the next step in treatment.