Background: Postoperative pain remains a challenging problem in part because the underlying mechanisms are still not well understood. There is a compelling need for translational studies in human models of postoperative pain to bridge the gap between animal models und human clinical studies. Methods: Somatosensory changes using Quantitative Sensory Testing for up to 72 h after an experimental 4-mm incision were characterized in 20 male volunteers. Results: During incision, perceived pain was 29 on a 100-point numeric rating scale and declined rapidly over the next 60 min. After incision, thresholds at the site of incision were lowered to painful heat (primary heat hyperalgesia; P Ͻ 0.01, effect size: 0.68) but not to painful cold (P Ͼ 0.05, effect size: 0.00). Remote to the incision, mechanical pain thresholds were lowered, pain ratings were increased, and an area of hyperalgesia occurred (P Ͻ 0.05, effect size: 0.56; P Ͻ 0.01, effect size: 0.70; P Ͻ 0.01, respectively; secondary mechanical hyperalgesia). All signs of heat and mechanical hyperal-
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