Knee joint playing sodium glass acid, most patients can maintain 6-12 months, while some patients can only maintain 3-6 months, the details are as follows: First, maintain 6-12 months: for mild to moderate degenerative osteoarthritis of the knee joint, the patient does not have obvious joint effusion, after the injection of sodium glass acid can significantly improve the nutrition of joint cartilage, and lubricate the joint surface, reduce friction, the patient’s joint pain symptoms The patient’s joint pain symptoms and joint stiffness will be significantly relieved, and generally the better effect can be maintained for 6-12 months. Second, the maintenance of 3-6 months: severe osteoarthritis of the knee, even if a course of sodium glass acid, can only be maintained for 3-6 months, the patient will be 3-6 months after the joint pain again, limited activity and joint stiffness. Therefore, repeated courses of treatment can be administered repeatedly and can provide significant relief to such patients.