Figure 1. Mean pain intensity measured with visual analog scale (VAS) 1, 2, 3, 7 and 10 days after surgery in patients undergoing spinal anaesthesia alone (group 1, n=27) or combined with local anaesthesia of periarticular soft tissue (group 2, n=20), periarticular soft tissue anesthesia and postoperative femoral nerve block (group 3, n=20) and pre-emptive infiltration anaesthesia and local periarticular soft tissue anaesthesia. Possible score range 0 to 10, with 10 representing the biggest pain. *P<0.05 compared to group 3.