Backgroud:Literature have reported that topical use of TXA can reduce perioperative blood loss in acetabular fracture surgery.We aim to investigate the effect of intravenous administration of tranexamic acid (TXA) on perioperative blood loss during acetabular fracture surgery Methods:From January 2016 to October 2019, 85 patients undergoing surgical treatment with intravenous TXA administration for acetabular fractures at our department were retrospectively analyzed. The patients were divided into three groups according to dosage of TXA: Single treatment group: patients receiving intravenous infusion of TXA (15 mg/kg) 20 min before surgery (n = 33), repeated treatment group: patients receiving intravenous infusion of TXA (15 mg/kg) 20 min before surgery and intravenous infusion of TXA (10 mg/kg) at 3 h (n = 26), and multiple treatment group: patients receiving intravenous infusion of TXA (15 mg/kg) 20 min before surgery and intravenous infusion of TXA (10 mg/kg) at 3 and 6 h (n = 26). Total blood loss, intraoperative blood loss, postoperative hemoglobin drop, surgery-related transfusion rate, postoperative thrombosis rate, and operation time were compared among these three groups Results:Total blood loss, intraoperative blood loss, postoperative hemoglobin drop, and drainage volume in the single treatment group, repeated treatment group, and multiple treatment group were 932.7.0 ± 181.8 ml, 624.2 ± 138.7 ml, 32.2 ± 5.3 g/l, and 100.1 ± 30.1ml; 843.4 ± 153.0 ml, 567.3 ± 144.1ml, 27.6±3.8 g/l, and 86.1± 42.2 ml; and 748.0 ± 145.2ml, 521.1 ± 98.1ml, 24.4 ± 4.4g/l, and 64.8 ± 29.0 ml, respectively; the values were significantly different between groups (P <0.05). The surgery-related blood transfusion rates in the single treatment, repeated treatment, and multiple treatment groups were 51.5% (17/33), 23.0% (6/26), 19.2% (5/26), respectively. There was no statistically significant difference in surgery-related blood transfusion rates between groups Conclusions:Intravenous administration of TXA in acetabular fracture surgery can reduce total blood loss, intraoperative blood loss, and postoperative hemoglobin drop without increasing the risk of venous thrombosis. Multiple administrations before surgery, and at 3 h and 6 h during surgery are more effective than single and repeated administration