There is no maximum number of times a year that you can get sodium vitrate injections in the knee. For patients with effective treatment, a course of treatment is about 3 to 5 times, with a week between sessions. Sodium vitrate is one of the components of synovial fluid and cartilage matrix, which plays an important role in reducing inter-tissue friction, cushioning stress, and protecting articular cartilage, etc. It can be used for the treatment of osteoarthritis, gouty arthritis, and so on. It has fewer adverse effects, mainly knee pain and other and less common, so there is no limit to the maximum number of shots a year. Generally, it is applied as needed, and those with effective treatment will have improvement in symptoms after 1 or 2 doses. Pregnant women, the elderly, children, liver insufficiency should be used with caution, nursing women should stop breastfeeding when using the drug. Sodium vitrate should be applied under the supervision of a physician.