Sodium vitrate is primarily lubricating and nutritive to the knee joint. Sodium vitrate knee intracavitary injection is mainly used for osteoarthritis of the knee joint. As the cartilage in the joint will produce wear and tear, degeneration and unevenness, patients may experience pain during activities, limited activities or even deformity. Sodium vitrate has a certain molecular weight and viscoelasticity, which can fill the gaps in the joints, lubricate the articular cartilage and meniscus, and reduce the friction between the cartilage, which can help to alleviate the patient’s pain symptoms. In addition, sodium vitrate can play a certain nutritional effect on cartilage and repair, but the recovery effect is not clear. Sodium vitrate is generally used for moderate and mild osteoarthritis of the knee, which needs to be injected into the joint cavity, so it is recommended to use it under the guidance of a doctor and avoid self-medication. In addition, for severe osteoarthritis, this drug is less effective, so it is recommended to consult a doctor and get treatment as soon as possible.