The operation is characterized by easy cutting and peeling at the treatment site by stabbing deep into the lesion to relieve pain and eliminate disease. Its indications are mainly soft tissue injury lesions and bone and joint lesions. The advantage of small needle knife therapy is that the treatment process is simple, the incision is small, only a few needles like the thickness of the acupuncture needle eye, no suture, and the damage to human tissue is also small, and it is not easy to cause infection, no adverse reactions, no obvious pain and fear of the patient, no need to rest after surgery, short treatment time, short course of treatment, easy for patients to accept. In June 2012, a patient with osteoarthritis of both knees, Cao, a 59-year-old female with a fat body type, was admitted to the comprehensive third treatment area. The patient had swelling and pain in both knees, especially in the left knee, and the pain increased with activity and was more obvious when going up and down stairs. On examination, he found obvious swelling in both knees, positive pressure pain at the upper and lower patellar margins, positive floating patella test in the left knee, and obvious limitation of knee flexion and extension, especially in the passive flexion position of the left knee, which could not be straightened and placed flat on the bed, and friction sounds could be detected. The frontal and lateral radiographs of the knee suggested that the joint margins of the patella, femoral condyles and tibial plateau showed lip-like osteophytes, the intercondylar bulge of the tibia became sharp and the joint space became narrow. Based on the above symptoms, signs and plain films, a definite diagnosis could be made. The patient had been seen in many major hospitals in the city for more than 10 years, and the conservative application of drugs and physiotherapy were not effective, and he was advised to undergo knee replacement surgery. The patient could hardly walk. By chance, the patient learned from the TV that Dr. Jin Guoying, the chief physician of our treatment area, was good at treating various orthopedic soft injury diseases with acupuncture, and the patient came to our treatment area with the attitude of trying. The patient was in poor health, suffering from hypertension, diabetes and coronary heart disease. On the second day he came to our clinic, the blood test showed that the coagulation function was normal and there was no infection, which roughly met the conditions for acupuncture treatment, and in the afternoon of the same day, Dr. Jin Guoying, the chief physician, performed an acupuncture treatment for the patient after strict sterilization. After the operation, the patient’s pain in both knees was significantly reduced after 2 days, and the symptoms of limited joint movement were significantly improved. 1 week after the operation, the patient’s pain completely disappeared, and the left knee could be freely extended and placed flat on the bed, and the pain was no longer present when walking up the stairs. The patient’s symptoms disappeared within 7 days after just 1 acupuncture treatment during his hospitalization, and the patient left the hospital with great gratitude. With the aging of the population, there are more and more patients with osteoarthritis. According to statistics, 50% of people over 50 years of age suffer from arthritis, and osteoarthritis of the knee is a common disease with extensive degenerative changes in the structure of the bone and joint, so the painless, non-adverse, economical and affordable small acupuncture treatment is extremely worth promoting.