Intra-articular Application is More Effective Than Intravenous Application of Tranexamic Acid in Total Knee Arthroplasty: A Prospective Randomized Controlled Trial.

BACKGROUND: The optimal administration route of tranexamic acid (TXA) in total knee arthroplasty (TKA), and the effect of TXA on hidden blood loss and total blood loss are undetermined. The purpose of this study was to compare the effectiveness of intravenous versus intra-articular application of tranexamic acid in patients undergoing knee arthroplasty.

METHODS: A total of 150 patients undergoing primary unilateral total knee arthroplasty were randomly distributed to 3 groups (IV, intra-articular, and control group; each 50 patients) and administrated TXA (1 g IV and 50 mL intra-articular saline, 1 g intra-articularly and 50 mL intra-articular saline, and 0 g and 50 mL intra-articular saline, respectively). The amount of total and hidden blood loss (HBL), drainage, transfusion, changes in hemoglobin levels, and complications were recorded.

RESULTS: Intra-articular use of TXA reduced more total blood loss (P = .011) and reduced more total 48 hours drainage volume than IV use of TXA (P < .001). Two patients received transfusion in IV and control group. No deep venous thrombosis or other severe complications had occurred. The HBL volume had no significant difference among the control, IV, and intra-articular groups (708.6 ± 308.2, 651.7 ± 302.9, and 625.2 ± 252.1 mL, respectively; which was 65.6%, 70.8%, and 81.1% of the total loss).

CONCLUSION: Intra-articular administration of TXA significantly reduced total blood loss and drainage volume to a greater degree than IV injection in total knee arthroplasty without reduction of HBL.