The meniscus is a semilunar fibrocartilage structure in the knee joint space, located between the femoral condyle and the tibial plateau, with one on the inside and one on the outside. Qinfeng Yin, Department of Orthopaedic Surgery, Second Hospital of Shandong University In the daily activities of the knee joint, the meniscus plays a role in cushioning stress, reducing cartilage friction, and lubricating synovial fluid, and is a structure similar to the “rubber gasket” of the joint. Meniscus injury occurs when the knee joint is twisted and overflexed, such as during basketball, soccer, squatting and other sports. Typical case: Male patient, 43 years old, had pain in both knees for six months, with “locking” and “don’t get stuck” sensations, and painful joint effusion. MRI revealed a meniscal tear: Diagnosis: Torn meniscus of the knee joint, curled and stuck between the knee joints. It affects the patient’s knee movement and causes joint wear and fluid accumulation. Minimally invasive arthroscopic treatment: (mark minimally invasive surgical incision) Intraoperative situation: meniscal damage was clear, wear and seizure of the joint was given and trimmed Postoperative The minimally invasive incision of the knee was less than 1 cm and only one stitch was needed. He was able to go down to the ground the day after surgery.