Osteoarthritis of the knee is a chronic joint disease whose main changes are degenerative changes of the articular cartilage surfaces and secondary osteophytes. The main manifestations are joint pain and inflexibility. X-rays show narrowing of the joint space, dense subchondral bone, broken trabeculae, sclerosis and cystic changes. There is lip-like hyperplasia at the edge of the joint. In the later stage, the bone ends are deformed and the joint surface is uneven. The cartilage in the joint peels off and the bone fragments into the joint, forming intra-articular free bodies. Osteoarthritis, also known as degenerative arthritis, is not actually an inflammatory condition, but is primarily a degenerative condition that involves premature aging of the joints, especially the articular cartilage. Osteoarthritis represents the aging of the joints and is therefore called age-related arthritis. The common causes are chronic exertion, obesity, reduced bone density, trauma and genetic factors. Treatment of osteoarthritis of the knee: 1. Non-surgical treatment (conservative therapy) is aimed at relieving pain, delaying the development of the disease and protecting joint function. It includes physical therapy, non-steroidal anti-inflammatory drugs, injection therapy and Chinese herbal medicine. 2. Surgical treatment (1) Knee arthroscopic exploration and cleaning: This is a safe and practical new technique for diagnosing and treating knee diseases, which makes patients suffer less pain and complications, and has the characteristics of fast recovery and remarkable efficacy. (2) Knee joint replacement: Artificial knee joint replacement is a surgical procedure in which the damaged knee joint is partially or completely replaced by an artificially manufactured joint component, which removes the worn and damaged joint surface and implants it with an artificial joint like a dental brace to restore a normal smooth joint surface. Prevention of osteoarthritis of the knee: 1. Patients with osteoarthrosis of the knee should try to pay attention to less stairs, less hiking, less climbing, less standing, less holding children, less lifting heavy objects in their daily lives to avoid aggravating the condition 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 avoid impact and wear on the knee cartilage. 4. When the temperature drops in winter, the knee joint becomes cold and vasoconstricted, and blood circulation becomes poor, which often makes the joint stiff and painful, so pay attention to keeping warm in cold weather and wear knee pads if necessary to prevent the knee joint from getting cold. 5. Pay attention to your body posture when walking, don’t twist your waist, walk with your legs skimming, and avoid squatting for a long time. 6. For early and mid-stage patients with osteoarthrosis of the knee, it is important to avoid overexertion of the knee joint and to perform appropriate functional exercises to increase the stability of the knee joint. Swimming and walking are the best exercises that do not increase the weight of the knee joint, but also allow the muscles and ligaments around the knee joint to be exercised. 7. In terms of diet, you should eat more food containing protein, calcium, collagen and isoflavones.