This study is designed to compare the effects of different types of anesthesia during Total Knee Arthroplasty and Total Hip Arthroplasty, which are surgical procedures used to replace a damaged knee or hip joint. The research aims to determine if General Anaesthesia, where a patient is completely asleep, or Spinal Anaesthesia, which numbs a specific part of the body, leads to a higher rate of successful discharge on the same day as the surgery. Participants will receive one of these two methods of anesthesia to undergo their joint replacement procedures.

The group receiving General Anaesthesia will be given remifentanil hydrochloride and propofol through an intravenous infusion, which is a method of delivering medication directly into a vein. The group receiving Spinal Anaesthesia will receive medications through intrathecal use, which means the medicine is injected into the fluid surrounding the spinal cord. The medications used for this method include bupivacaine hydrochloride, epinephrine, sufentanil citrate, or fentanyl citrate.

During the course of the study, researchers will observe the time it takes for patients to move from the start of anesthesia through different stages of recovery. Information will be gathered regarding the use of analgesics, which are pain-relieving medicines, and the levels of pain experienced after surgery. The study will also track the ability of patients to move around, such as walking, and will monitor any unwanted side effects or the need for blood transfusions to ensure patient safety and recovery quality.