The prevalences of nausea on the night of surgery and postoperative day 1 and of pruritus were significantly lower in the periarticular injection group than in the epidural analgesia group ( 14 % and 45 % , p = 0.0031 ; 14 % and 55 % , p = 0.0003 ; and 0 % and 15 % , p = 0.014 , respectively ) .