One hundred sixteen patients with femoroacetabular impingement were randomized to room-temperature irrigation (n=60) or warmed irrigation at 36–38 °C (n=56). The primary outcome was intraoperative hypothermia (<36 °C) detected by either rectal probe or temporal thermometer. Secondary outcomes included monitoring modality performance (rectal vs temporal), time to hypothermia detection, and intraoperative tachycardia characteristics in patients with and without hypothermia. Outcomes were assessed throughout surgery at 15-minute intervals. Overall, the results of the study revealed no difference in hypothermia incidence between warmed and room-temperature fluids, while rectal monitoring detected nearly all events and did so markedly earlier than temporal measurement. Consequently, fluid warming alone did not prevent hypothermia.