According to the statistics of the Ministry of Health and Welfare, about 3.5 million people in the world suffer from knee joint pain, and about 20,000 people need surgery to replace artificial joints every year. The number of cases in their thirties and forties is also increasing. In fact, such problems can be prevented through simple activities. Japanese joint therapists suggest that sitting in a chair and shaking your knees before starting to walk may help prevent degenerative arthritis! Cartilage wear leads to degenerative arthritis, and promoting synovial fluid metabolism is expected to improve. Lvche Sheng, honorary professor of Toho University in Japan and chairman of Japan Artificial Joint Research Institute, said that about 8 million people in Japan suffer from knee pain and must be treated, most of them are degenerative knee arthritis, and simply swinging the knee can not only help to relieve knee pain, avoid continuous deterioration, and even avoid the pain of surgery. Lvche Sheng explained that in the knee joint, there is cartilage between the thigh bone and the calf bone to prevent the bones from rubbing directly, and synovial fluid is responsible for providing nutrition and lubrication to the cartilage. When cartilage is worn, it will reduce the smoothness of joint movement and make bones rub and produce pain, which is called degenerative arthritis. Lvche Sheng believes that proper knee joint movement can make joint synovial fluid more full and knee joint movement smoother; At the same time, cartilage can also get more nutrition through synovial fluid, which is helpful to cartilage regeneration and relieve knee pain. Shin Shimizu Ichi, president of Shimizu Plastic Surgery Clinic in Japan, also said that if the knee is deliberately inactive because of knee pain, it may slow down the metabolism of synovial fluid, and cartilage is not easy to obtain nutrition, resulting in weakened regenerative capacity. Relatively speaking, moderate exercise is helpful to improve synovial fluid metabolism and is expected to improve the problem of degenerative arthritis. However, Shan Ye Qingshu, an emeritus professor at osaka city university Institute and a plastic surgeon, also reminded that moderate exercise is helpful for the normal operation of synovial fluid, but excessive exercise will accelerate cartilage wear. Lvche Sheng suggested that simply moving your knees in a chair before standing up can not only promote the metabolism of synovial fluid, but also gently move the muscles, tendons and skin at the joints, which also helps to relax and make the activities smoother. Sit in a chair and relax. Lift your left knee off the ground with both hands. The calf swings up and down 10 times. Change feet when you're done. Just change it left and right three times. I suggest you practice before you stand up and start walking.