”The knee is one of the first areas of pain for many middle-aged and older adults. Why do middle-aged and older adults experience pain in the knee joint? Many times it is due to sports injuries. Sports injuries, as the name implies, are injuries to joints, muscles, ligaments and other tissues caused during sports activities. For older adults, not only is physical exercise a sport, but everyday walking, going up and down stairs and running can damage our joints. Many middle-aged and elderly people come to the clinic with joint pain, and when asked about the cause, most of them suffer from sprains caused by walking, chasing cars and turning around, and sometimes the pain is longer and they forget how the injury occurred. Why is the knee joint of middle-aged and elderly people easily injured during sports? First of all, we need to understand the structure of our own knee joint. In addition to bones, there is cartilage, meniscus and cruciate ligaments inside our joints, and each of these tissues has its own function. Once an injury occurs, normal physiological functions will be lost and inflammatory factors will form in the injured area, causing pain or sinking, astringency and stiffness in the knee joint. In some cases, free bodies are formed, which can cause compression and strangulation of the joint. While young people only cause damage to the internal structures of the joint during intense exercise, why do injuries in older people occur during light exercise, even a turn? This is due to the aging of the joints. Human aging is manifested in every part of the body, our meniscus, cartilage, and ligaments all age with age, and the aging of these tissues is manifested in dehydration, embrittlement, and hardening. The strength of the muscles and nerve response of the elderly is much less than that of the young, which, together with the aging of the tissues, can easily cause injury under minor external forces. The acute period of injury is very short, with swelling and pain in the joint within 2-3 days after the injury, sometimes not very noticeable. Some of these pains may be relieved after rest or self-treatment. The condition may change from time to time, worsening with exertion or excessive exercise and relieving with rest or medication. In the early stages of the disease, doctors often unconsciously assume that the disease is a geriatric arthritis because the patient is elderly, and conservative treatment masks the nature of the joint injury, thus compromising early treatment. By the time the injury is advanced, the final manifestation of the disease is consistent with geriatric osteoarthritis, and thus the treatment is transferred to the same level. Therefore, the treatment of the joint should be diagnosed early and treated early so that it does not turn into age-related osteoarthritis. How can middle-aged and elderly people prevent sports injuries to the knee joint? Many middle-aged and elderly people like to participate in various kinds of sports for the purpose of strengthening their bodies. However, we must first choose the right sports according to our own conditions and habits. For example, we seldom climb mountains, but after retirement, there are such senior groups that organize mountain climbing activities, which are not very suitable for us, and the damage to the knee joint far outweighs the benefits of the exercise. There are also the popular brisk walking, long-distance running, dancing, shuttlecock, etc. Even if we usually have the basis for certain exercises, as we grow older, we should control the time and frequency of exercise to the extent that we can tolerate it without strain. And to do a good warm-up and preventive measures before exercise. If their own heart disease, hypertension and other chronic diseases, in the exercise should also pay attention, do not compete, to fitness for the purpose of participation as the main. Once we middle-aged and elderly people have knee injuries during sports, we should do the three early, early examination, early diagnosis and early treatment. Even though sometimes medical treatment can be delayed by various circumstances, it is important to remember that it is never too late to mend the fold and not to wait until the joint injury forms osteoarthritis and then treat it. Minimally invasive knee arthroscopy has been transformed from a sports injury application for athletes to a more widespread medical application for all types of knee injuries, such as meniscus repair, cartilage injury, and cruciate ligament reconstruction. The biggest advancement is the use of knee arthroscopy, which has allowed us to achieve maximum efficacy in the treatment of knee disorders with minimal trauma. Ultimately, we hope that middle-aged and elderly people will choose the right sports for themselves, so that they can stay fit, live longer and reduce sports injuries. We hope that the elderly will choose the right sports for themselves, to strengthen their bodies, to prolong their lives, to reduce sports injuries, to recognize their own joints, to seek medical treatment for problems, to control diseases at an early stage, and to minimize the damage caused by diseases.