What is the perioperative period? The perioperative period is a collective term that refers to the period of preparation before surgery, during surgery, and recovery after surgery in the hospital. Our perioperative analgesia Our perioperative analgesia encompasses preoperative hyper-analgesia, intraoperative analgesia with the cocktail of analgesia taught by Professor Ranawat at the New York Hospital for Special Surgery, and a gradient of postoperative analgesics. At the same time, postoperative pain will be minimized because our artificial total hip replacement and artificial total knee replacement techniques conform to the internationally advanced minimally invasive features and cause minimal damage to soft tissues such as muscles, and the use of postoperative analgesic drugs is minimized to reduce the side effects of analgesics and improve postoperative comfort.