After vitreous acid sodium injection in the knee joint, care includes the following items: 1, to do a good job of local skin care of the puncture point or needle entry point, if there is local redness, swelling, heat, pain, or even pus outflow, it may be a puncture point infection, in order to prevent infection, need to clean and change medication; 2, after the vitreous acid sodium injection appropriate brake rest, for the joint is helpful. It is good for the patient’s recovery to give the joint time to buffer; 3. After sodium vitrate, some may have allergic reactions or adverse reactions to the drug, which may cause swelling and pain in the knee joint, painful joint movement limitation and other related manifestations. In the case of similar diseases, local physiotherapy, hot compresses, and baking can be used to increase local blood circulation for proper relief. If there is no relief, a hospital visit should be made to see if there is an infectious arthritis.