108 patients scheduled for total hip arthroplasty under spinal anaesthesia were randomized to postoperative analgesia with either an ultrasound-guided fascia iliaca block, or the addition of 10ug morphine to spinal anaesthesia. All patients were managed with intravenous patient-controlled morphine postoperatively. The fascia iliaca block group demonstrated inferior analgesia to the spinal morphine group, as assessed through cumulative intravenous morphine consumption over the first 24 hours postoperatively. No significant differences in the incidences of opioid-related adverse events were observed.