The best treatment for meniscus grade III injury is arthroscopic surgery to suture the meniscus to restore the flatness and most of the meniscus function. A Grade III meniscal injury is often referred to as a meniscal tear. Once a Grade III meniscal injury occurs, it can cause secondary damage to the articular cartilage and can also lead to traumatic synovitis. Patients may experience significant joint pain and limited joint movement, such as joint entrapment, especially when walking on flat surfaces, walking up and down stairs, and squatting. Longer duration of the disease may also lead to secondary atrophy of the quadriceps muscle and weakness of the lower extremities, or even intermittent unilateral lower extremity claudication. Early surgical treatment can restore the flatness of the meniscus and prevent secondary damage to the articular cartilage and synovium. Surgery is usually performed with meniscal sutures, and the number of stitches is usually chosen according to the area and extent of the injury, usually 2-3 stitches. Post-operatively, with reasonable rehabilitation, the function of the knee joint can be restored, as well as the strength of the quadriceps and other muscles and joint stability.