Osteoarthritis of the knee, also known as degenerative arthritis of the knee, is a chronic osteoarthropathy caused by the destruction of articular cartilage due to degeneration of the joint, with the main lesions being degenerative lesions of the articular cartilage and secondary osteophytes. It is a common clinical disease characterized by progressive degeneration and loss of articular cartilage in the elderly, and its incidence is on the rise as the population lives longer and the aging society approaches. The causative factors of this disease are complex, and it is difficult to effectively control the development of the disease by relying on drugs or surgery alone. The knee joint is the most weight-bearing and active joint in the human body, with a complex structure. The activities and stability of the knee joint mainly depend on the muscles, ligaments, bursa and other structures around the joint, which are vulnerable to acute and chronic injuries and the attack of wind, cold and dampness. Its occurrence is closely related to the climate. Therefore, the elderly should first pay attention to the warmth of the knee joint to prevent cold (with knee pads or elastic bandages). The first step is to convince the patient that the prognosis is good, and that the patient can eliminate or reduce the symptoms and live and work normally as long as the treatment is timely and reasonable, the lifestyle is changed, and the atrophied knee muscles are actively exercised under the guidance of the rehabilitation teacher. In addition, patients should be instructed to cultivate interest in life, increase social interaction, overcome depression, tension, fear and other negative emotions, and establish a positive and optimistic attitude, which is conducive to the recovery of the disease. Weight loss Weight gain is directly proportional to the onset of osteoarthritis of the knee. Obesity is also a factor that aggravates the disease. Weight loss in obese people can reduce the incidence of osteoarthritis of the knee. Data show that the incidence of osteoarthritis of the knee can increase or decrease by 40% for every 4-5 kg increase or decrease in weight in obese women and 4-8 times in obese men. If weight loss is successful, the incidence of symptomatic arthritis can be reduced by 26%-52% in men and 28%-53% in women. Therefore, weight loss should be achieved by controlling diet, improving food structure (low-fat, low-sugar, low-sodium diet), and strengthening non-weight-bearing exercise. After the pain is relieved, walk slowly on flat ground 1-2 times a day for 30-50 min each time. Try to reduce up and down steps, running and other exercises that put weight on the knee joint to avoid and reduce the wear and tear of joint cartilage. Older people should not take a half-squatting position, making the knee joint sway back and forth. The pressure on the patellar surface is greatest when half squatting, and rocking will increase wear and tear, resulting in osteoarthritis of the knee joint. 5, exercise therapy The body due to physiological aging muscle atrophy, muscle strength decreased, the protection of the joint function is reduced, resulting in joint instability, articular cartilage is vulnerable to damage and cause osteoarthritis of the knee. The patient’s pain causes a decrease in mobility, which leads to the disuse of muscles and other motor organs, further muscle atrophy, and further development of the disease, and so on, in a vicious circle. Exercise therapy can increase the muscle strength of the muscles around the knee joint to break the vicious cycle and promote improvement. I personally recommend swimming, there are many international clinical randomized controlled trials to confirm that the analgesic effect of exercise therapy is no less than that of drug therapy, even for terminal patients, exercise therapy is also very effective in improving the patient’s mobility. 6.Muscle exercise: straight leg raise, lateral leg lift and prone knee flexion can be performed 2-3 times a day with 20-30 strokes each time.