When it comes to injections, no one is a stranger to them. Many patients often don’t take injections seriously, thinking that it’s just a shot into the knee joint, which doesn’t sound complicated, so they can just find a clinic and do it. What are the rules for giving knee injections and what should I pay attention to afterwards? For the injection of sodium vitreous acid, a course of treatment requires 3-5 injections, usually once a week. After two or three injections can work, the effect can be maintained for two or three months, but some patients due to heavy disease or too mild disease, the role of the injection is not obvious. Because the injection of sodium vitreous acid has to be injected continuously for 3~5 shots, coupled with the large number of patients in large hospitals, many patients are reluctant to always go to the hospital for injection and return to the small clinics near their homes for injection after a shot in the hospital, which is not recommended. Prof. Cao Yongping explained that although the knee joint cavity is large and it may seem easy to inject drugs into it, it is not. The knee joint is made up of many structures and it is important to not only accurately inject the medication into the joint cavity, but also to avoid other tissues. A common injection site is from the lateral aspect of the suprapatellar capsule (pictured). General clinics and even community hospitals cannot guarantee that the drug will be injected into the joint cavity, which often results in the following consequences: first, the drug is wasted and suffers for nothing; second, it is easy to hit the soft tissues, as the molecular weight of sodium glass is very large, which causes swelling and pain in the soft tissues and is difficult to absorb; third, if the sterilization is not qualified, it is easy to cause infection. So try to inject in big hospitals and have a start and finish. For patients with effective sodium vitreous acid injection, one course of injection in a year is enough, if the number of injections is too many it is easy to increase the risk of joint infection. For patients who are not effective after the injection, there is no need to inject again. Be careful to avoid bathing on the same day after each injection, because after all, there are needle holes that may be infected. Remind patients: If there is slight redness and swelling after vitreous acid sodium injection, it may be caused by the drug stimulating the synovial membrane to secrete joint fluid. If the pain is not serious, you can apply cold compresses appropriately and avoid joint activities; if there is severe swelling and pain, you should seek medical attention as soon as possible to avoid drug injection to other parts of the body.