Sodium vitrate in knee joint, most patients can keep 6-12 months, while some patients can only keep 3-6 months, the details are as follows: First, keep 6-12 months: for mild to moderate degenerative osteoarthritis of the knee joint, the patient does not have obvious joint effusion, the injection of sodium vitrate can significantly improve the nutrition of the articular cartilage and lubrication of the joint surfaces, reduce friction, the patient’s joint pain symptoms and joint stiffness symptoms will be significantly relieved. The patient’s joint pain symptoms and joint stiffness symptoms will be significantly relieved, and the general effect of good people can be maintained for 6-12 months. Second, maintain 3-6 months: severe osteoarthritis of the knee joint even if the sodium vitrate a course of treatment, can only be maintained for 3-6 months, the patient will be in 3-6 months after the joint pain, activity limitations and joint stiffness. Therefore, multiple courses of treatment can be repeated and can provide significant relief to such patients.