Osteoarthritis of the knee (osteoarthrosis) is one of the most common joint diseases in the elderly, and is also the main cause of lower limb disability in the elderly, seriously affecting their daily activities and quality of life. Therefore, actively preventing the occurrence of osteoarthrosis and slowing down the progress of osteoarthrosis should become a mandatory daily course for the elderly. Patients with osteoarthrosis of the knee should try to pay attention to less stairs, less hiking, less hiking, less standing, less holding children and less lifting heavy objects in daily life to avoid aggravating the disease by overloading the knee joint. 2. Maintain a proper weight to prevent obesity and increase the burden on the joints of the lower limbs. Once you are overweight, you should actively lose weight, pay attention to diet regulation and weight control. 3, try to avoid wearing high heels for long walks, high heels will change the force line of the lower limbs. The elderly should prefer thick-soled and flexible soft-soled shoes in their daily activities to reduce the impact on the knee joint and to avoid impact and wear on the knee cartilage. 4. Before participating in outdoor sports (such as Yangtze, Taijiquan, etc.), you should do preparatory activities to gently stretch the knee joint, increase the flexibility and agility of the lower limbs, and let the knee joint move before participating in sports. When practicing leg press, do not lift your legs too high to prevent excessive strain on knee ligaments and muscle tissue; when playing taijiquan, the range of motion should not be too large and the squatting position should not be too low to prevent injury to the knee joint from being overloaded. 5, cycling is a good way to exercise the knee joint under non-weight bearing. However, when riding a bicycle, the height of the seat should be adjusted to sit on the seat with both feet in the pedals, both legs can be straight or slightly bent, the seat is too high, too low or uphill when pedaling hard, the knee joint have adverse effects, should be careful to avoid. 6, when the temperature drops in winter, the knee joint is cold vasoconstriction, blood circulation becomes poor, often making the joint stiff, pain aggravated, so in cold weather should pay attention to keep warm, if necessary, wear a knee brace to prevent the knee joint cold. 7. Pay attention to your body posture when walking, do not twist your waist to work, walk with your legs skimming, and avoid squatting for a long time. Daily squatting movements (such as washing clothes, choosing vegetables, mopping the floor) is best to sit on a small bench instead. Avoid maintaining a posture for a long time, pay attention to often change posture. For example, after standing for a period of time, you can stretch your legs, tie the horse stance, and develop good habits in daily life to protect the joints. 8. For early and mid-stage patients with osteoarthrosis of the knee, it is important to avoid overexertion of the knee joint and to carry out appropriate functional exercises to increase the stability of the knee joint. Exercising the muscles of the legs not only relieves joint pain, but also prevents the progression of the disease. Do not assume that the only way to protect the diseased knee joint is to rest and not be active. According to studies, swimming and walking are the best exercises for patients with osteoarthrosis of the knee, which do not increase the weight on the knee joint but also allow the muscles and ligaments around the knee joint to be exercised. Secondly, supine leg lifts and empty pedal bicycles are the best exercises for patients. 9, diet, should eat more food containing protein, calcium, collagen, isoflavones, such as milk and dairy products, beans and soy products, fish and shrimp, kelp, black fungus, chicken claws, pig’s feet, lamb leg, hoof tendons, etc. These can not only supplement protein, calcium, prevent osteoporosis, but also nourish cartilage and joint fluid, but also supplement estrogen, so that bones and joints better metabolize calcium and reduce arthritis symptoms. 10, treatment, once the knee joint pain, to actively treat, take heat, physical therapy and other simple therapy to control the symptoms, such as pain relief is not effective, under the guidance of a doctor, can take Fotarim, ibuprofen, Fenbid and other drugs, while the external use of some pain relief sprays and creams. If the pain does not improve with medication and affects walking and daily life, the knee joint should be cleaned up with arthroscopic technology at a major hospital. Patients with severe osteoarthrosis who do not do well with arthroscopic treatment can choose arthroplasty to restore joint function and maintain a good quality of life.