Knee pain in young people after sports sprains, walking up and down stairs or squatting pain in women, knee pain and walking inconvenience in the elderly, all these knee problems are caused by damage to soft tissues such as cartilage and ligaments in the joints. In the past, it was not easy to diagnose these problems correctly, and after a clear diagnosis, the only way to treat them was to cut open the knee joint and operate, but the cut-open surgical treatment had a large wound, the patient suffered a lot of pain, and it took several months for the knee joint function to recover. Nowadays, there is a reliable diagnosis and treatment technique, arthroscopic surgery, which can avoid the incision surgery. Arthroscopic surgery is a minimally invasive technique in the field of orthopedics, which has been used in clinics in foreign countries since the 1970s and was introduced in China in the 1980s. Tang Hengtao, Department of Orthopaedics, First Affiliated Hospital of Zhengzhou University When doing arthroscopic surgery, the doctor under anesthesia cuts two to three 4-6mm incisions around the corresponding joints, and puts the arthroscope, which is thinner than the head of chopsticks, into the joints from one of the incisions, and connects it to the extra-articular monitor through the optical fiber, so that you can see almost all the parts of the joints on the monitor, which is more comprehensive than the incision of the joints; as the image is enlarged, it can be more accurate than the incision of the joints. As the image is magnified, the doctor can make a clear diagnosis of the condition inside the joint, which is more accurate than cutting through the joint. At the same time, through another incision into the slim surgical instruments, you can treat the lesions in the joint, such as removing the swollen synovial membrane, removing the joint activity of the bone, suture torn meniscus, reconstruction of intra-articular ligaments and so on. It can be seen that arthroscopic surgery does not require extensive incision and exposure of the joint, so it is naturally less traumatic than incision surgery, with fewer complications and quicker recovery. Patients can walk on the ground on the same day after the surgery, and the hospitalization time is significantly shortened, which correspondingly reduces hospitalization costs. Moreover, due to the small incision, the scar after surgery is almost invisible, which eliminates the fear of many patients, especially female patients, about the scar left after surgery, and makes it easier for them to accept the surgical treatment. Arthroscopy has a wide range of applications. Large joints such as hip, knee, ankle, shoulder, elbow, wrist, and even finger joints can undergo arthroscopic surgery. Currently, the most common applications of arthroscopic treatment are knee and shoulder joints. Osteoarthritis, joint free bodies, meniscus injuries, and cruciate ligament injuries are the most common indications. In short, arthroscopic surgery can be used for both diagnosis and treatment; it can treat both chronic diseases such as arthritis and acute trauma such as fractures. President Clinton had arthroscopic ACL reconstruction surgery. Minimally invasive arthroscopic surgery has become the method of choice for the diagnosis and treatment of joint diseases.