Mohd Azizan G, and Karis M, and Noordin Y, (2013) Spinal anaesthesia with bupivacaine and intrathecal morphine versus combined spinal-epidural anaesthesia using bupivacaine and epidural infusion of bupivacaine plus fentanyl for postoperative analgesia after hip and knee arthroplasty. Journal of Surgical Academia, 3 (2). pp. 46-53. ISSN 2231-7481