Effect of THR and TKR surgery on postoperative pain. Postoperative pain was measured by a point scoring system with 1 indicating no pain; 2, mild pain; 3, moderate pain and 4, severe pain. The points represent median ± SD, as determined by the Friedman test (P = 0.020 THR, P = 0.012 TKR). Baseline vs day3 (*P = 0.025) postoperative TKR; Baseline vs days 1 and 3 (*P = 0.025 and *P = 0.034, respectively) postoperative TKR, n = 10. SD, standard deviation; THR, total hip replacement; TKR, total knee replacement.