Intraoperative Period Patients received intraoperative sedation at the discretion of the consultant anesthesiologist using fentanyl, midazolam and propofol as deemed clinically appropriate. At the conclusion of the procedure, the patients received 30 ml 0.5% bupivacaine diluted with 70 ml 0.9% saline local infiltration analgesia (LIA) injected into the layers of soft tissue around the knee joint by the surgeon. .