There are many different names for osteoarthritis of the knee. Many people in China believe that the disease occurs mostly in the elderly and has “bone spurs”, so it is called geriatric arthritis. However, academically it is mostly called “osteoarthritis”. In addition, because these patients have joint deformation, it is also called “deformational arthritis” or “hypertrophic arthritis”. In Europe and the United States, the disease is called degenerative arthritis because it is caused by the body type of the person. Although these names are different, pathologically, it is due to degenerative changes in the cartilage of the joints. The bone, including the synovial membrane, joint capsule and other structures of the joint, when orientation and levels of chronic inflammation of varying degrees. The incidence of osteoarthritis is very high, are accounted for 1/2 – 3/4 of the patients with knee pain. causes of this disease is very many, but according to yet no local causes, can be divided into secondary and primary two: primary: age: is with age, the cartilage surface after long-term wear and tear, while the metabolic capacity is reduced, degeneration accelerates and cartilage breakage is caused. This change generally occurs after the age of 20, some people have certain symptoms after the age of 30, 60% after the age of 50, 90% above the age of 60, and 100% of cartilage has degeneration after the age of 70. While >20% show symptoms, only 5% seek medical attention. Synovial secretion function is reduced and the ability to lubricate and nourish articular cartilage is reduced. Gender: More women than men, especially postmenopausal women. This is caused by the decreased level of hormone secretion in postmenopausal women, osteoporosis, obesity, coupled with a wide pelvis in women, gait inner tube walking, and pressure pain on the inside of both knees, causing joint stability. Heredity: related to heredity, such as parents, aunts have the disease is more likely to occur in the children. Weight: Overweight is more likely to occur. As the name implies, increased weight increases the load on the articular cartilage and aggravates degeneration. Diet: Poor nutrition is also a cause of joint disease because cartilage has no blood vessels and relies on joint fluid for nutrition, while inadequate nutrition leads to poor cartilage value-added and insufficient new cartilage, causing wear and tear in the weight-bearing area, which worsens with age. Climate: People who live in wet and cold environments for long periods of time tend to have symptoms. This is mainly due to the fact that the knee joint is “skin and bone” and there is no muscle tissue around the joint to keep it warm, and heat is often in short supply. Combined with the joint surface of the cartilage tissue more and blood vessels sparse blood circulation is poor if the knee joint for a long time by cold or cold stimulation, can cause vascular spasm, poor blood supply, so that the cartilage metabolism and immune defense ability. So that the blood circulation in the bone is poor, the pressure in the bone is increased, and the pressure in the joint is increased, causing symptoms. Secondary factors: such as acute traumatic joint hemorrhage. Cartilage block avulsion, joint dislocation, chronic strain knee inversion, meniscal injury, congenital dislocation. Secondary to inflammatory arthropathy, acute and chronic septic inflammation, tuberculosis, rheumatism, diabetes, etc. All of the above adverse stimuli in life can lead to permanent damage to the cartilage and cause a variety of discomfort in the joint.