Knee osteoarthritis (KOA) refers to a degenerative disease in which primary or secondary degeneration and structural disorders occur in the cartilage of the articular surface of the knee, accompanied by subchondral osteophytes and cartilage exfoliation, resulting in gradual destruction and deformation of the joint, and ultimately in knee dysfunction. . As our population gradually enters the ageing era, the incidence of OA is expected to increase. The etiology of the disease is not well understood, but it is closely related to age, gender, occupation, metabolism, and injury. Its pathological changes are a degenerative changes in articular cartilage caused by osteophytes as the main joint lesions, the inflammation of the synovial membrane is a secondary lesion. Diagnostic points】 1. History of repeated strain or trauma. 2. Knee pain and stiffness, more pronounced in the morning when waking up, relieved by activity, aggravated by more activity, and relieved by rest. 3. Late pain persists, joint activity is significantly limited, quadriceps muscle atrophy, joint effusion, and even deformity and intra-articular free body. 4. Friction sounds can be detected during knee flexion and extension activities. 5. Frontal and lateral X-rays of the knee joint show lip-like osteophytes on the joint edges of the patella, femoral condyles and tibial plateau, the intercondylar ridge of the tibia becomes sharp, the joint space becomes narrower, the subchondral bone is dense, and sometimes intra-articular free bodies are seen. Differential diagnosis】 1. Patellar chondromalacia: the greater the knee activity, the more obvious the pain, and there is hyperextension pain and walking weakness. There is pressure pain on the anterior, inferior, medial, lateral and N fossa of the knee. When the knee is extended with pressure on the patella, friction and pain can be palpated. Patellar grinding test is positive. 2. Lateral collateral ligament injury of the knee: there is fixed pressure pain at the site of ligament injury, often at the upper and lower attachment points of the ligament or in the middle. The knee joint is in a semi-flexed position, with limited movement of the joint. Positive lateral squeeze test. 3, knee meniscal injury: history of trauma, post-injury joint pain, swelling, popping and interlocking phenomenon, pressure pain in the internal and external space of the knee. In the chronic phase, the quadriceps muscle atrophy is especially obvious in the medial quadriceps. The McDonald’s sign and grinding test are positive. 4. Subpatellar fat pad injury: history of trauma, strain or cold in the knee. The pain in the knee joint is worse when going down the stairs, the pain is worse in the knee hyperextension position, the pressure pain in the infrapatellar fat pad is obvious, the knee hyperextension test is positive, the patellar tendon relaxation pressure pain test is positive. x-ray lateral knee film, the texture of the fat pad scaffold is thickened, a few can see the fat pad calcification shadow. Acupuncture treatment】 1, acupuncture: acupuncture points: knee eye, A-Ye point, blood sea, Yanglingquan. Operation: Electric acupuncture is connected to the knee eye and A-Ye point. Retain the needle for 30 minutes. 10 times a course of treatment. 2. Acupuncture: AYe point, usually on the attachment point of tendons or ligaments. Operation: pierce and then separate longitudinally and then laterally.