The main effects of closed injections are anti-inflammatory and analgesic, among others. Closed injections generally consist of local anesthetic and hormonal drugs. Commonly used local anesthetic drugs include lidocaine, which mainly plays an analgesic role, but the action time is relatively short. Commonly used hormonal drugs are betamethasone, trimethoprim and so on. Betamethasone is a long-acting anti-inflammatory drug, and triamcinolone acetonide is a short-acting anti-inflammatory drug, which mainly plays the role of reducing inflammation and edema. Closed injections are mainly used for the treatment of tenosynovitis, synovitis, tendonitis, chronic sports injuries and other diseases. Although the closed needle can relieve the patient’s pain, but long-term use will lead to femoral head necrosis, osteoporosis and other effects, although the injection of closed needle is not addictive, patients should be used under the guidance of a doctor to avoid the adverse consequences of long-term use.