Sodium vitrate is not a closed needle; these are two different drugs and can have very different indications for disease treatment. The former is a drug that affects joint cartilage and lubricates joints, mainly for the treatment of early and mid-stage osteoarthritis, and is generally taken as a joint cavity injection treatment plan. The closed-joint injection is a certain anesthetic with corresponding hormonal drugs, mainly for the treatment of aseptic inflammation. These diseases also include arthritis treatment, but currently in clinical practice, the application of closed needle method of arthritis treatment is relatively small. Closed needle is mainly for the injection of painful points, such as sterile inflammation, Achilles tendonitis, or pelvic inflammatory disease, chronic soft tissue strain and other diseases, closed needle selection will be more cautious in the clinic, because this treatment method if treated well, the effect is good, but also not recommended for a long time application.