Safety and efficacy of intra-articular tranexamic acid injection without drainage on blood loss in total knee arthroplasty: A randomized clinical trial

Abstract Background Major blood loss is unavoidable after primary total knee arthroplasty (TKA). The aim of this study was to determine if tranexamic acid (TXA) can reduce major blood loss following TKA. Methods In this double-blind, randomized, placebo-control trial, 60 patients treated with unilateral primary cement TKA between August 1st 2013 and September 30th 2013 were randomized into TXA 500 mg intra-articular injection without drainage (test group, 30 knees) and 30 patients with saline intra-articular injection (control group, 30 knees). Results There was a significant reduction in mean blood loss (560.55 mL) between the groups at postoperative day (POD) 5 (999.22 mL vs. 1559.77 mL, P = 0.001). The maximum hemoglobin drop was identified at POD 3 (10.51 g/dL vs. 9.10 g/dL, mean difference = 1.41 g/dL). Also, there was a significant reduction in red blood cell and hematocrit loss ( P = 0.001). The transfusion rates (0% vs. 23.3%, P = 0.011) and average amount transfused (0.00 ± 0.00 units vs. 0.53 ± 1.04 units, P = 0.009) were significantly lower in the TXA group compared with control group. No significant difference in coagulation marker changes were found between TXA and control groups ( P > 0.05), but the D-dimer levels at 3 and 5 days post-TKA were statistically lower in the TXA group ( P