Similar to familiar “mirrors” such as gastroscopy, cystoscopy, and laparoscopy, knee arthroscopy is also a type of endoscope. Its working principle is that the 4mm diameter high-definition wide-angle rod-shaped optical lens, through a small incision in the skin into the knee joint, and through the fiber optic cable will be transmitted to the structure of the joint monitor, amplified to high-definition images, the doctor can be found in all areas of the knee joint lesion tissue. After accurate diagnosis, the doctor uses special microscopic instruments and probes to perform operations such as cutting, suctioning, suturing, fixing, and repairing the diseased tissues, with little trauma and quick recovery. Most joint injuries and diseases can be treated by arthroscopic surgery. The first is diagnostic examination of all joint diseases, followed by removal of intra-articular free bodies, treatment of synovial lesions of various diseases, cleaning of osteoarthritis, joint debridement of septic arthritis, removal of foci of joint tuberculosis, excision, suture and disc cartilage shaping of meniscus injuries of the knee, and reconstruction of cruciate ligament after injury. Who is suitable for the surgery? The most common indication for knee arthroscopy is osteoarthritis, which is a chronic degenerative disease commonly seen in the elderly, with the most common site of development being the knee joint. It was first called “opera house leg”, which means that after watching a play, the knee joints are painful when you have to stand up, and the symptoms will be alleviated after a little bit of activity. In China, it is called “old cold leg”, which means joint pain that occurs when the weather is cloudy. If the condition is not severe enough to require replacement of the joint surface, arthroscopic surgery can be performed to clean out the free bodies in the joint cavity and repair the joint surface to make it smoother. Common sports traumas in young people are cruciate ligament ruptures, injuries to the meniscus, and meniscal injuries that cause free bodies, which, if present, must be removed with arthroscopic surgery. There is also congenital discoidal cartilage, a congenital meniscus deformity. Early detection can lead to arthroscopic plasty to reshape it into the crescent shape of a normal meniscus, which is gradually shaped into a normal meniscus through future growth and development. What do I need to be aware of when recovering from surgery? Like most diseases, the treatment that the doctor gives to the patient is only one aspect of the recovery, and the postoperative recovery is also critical to the outcome of the surgery. It is important to develop a total body exercise program that takes into account the patient’s actual condition. For post-recovery exercise, it is important to warm up sufficiently before strenuous exercise to allow the body to adapt gradually. Osteoarthritis patients, on the other hand, should adhere to one principle – reduce joint wear and tear and “save”. The first step is to control weight and reduce the burden on the knee joints. The use of joints, to avoid going up and down the stairs, not allowed to weight-bearing, walking before the first weightless activity joints and so on.