Intravenous Use of Tranexamic Acid in Total Knee Arthroplasty with no Tourniquet.

 To identify blood transfusion requirements and postoperative complications in patients undergoing total knee arthroplasty (TKA) with no tourniquet and intraoperative intravenous administration of tranexamic acid.  This retrospective observational study analyzed 49 preopeative and postoperative medical records of patients undergoing TKA. A paired t-test compared changes in hemoglobin (HB) and packed cell volume (PCV), and an independent t-test with Welch correction compared HB and PCV changes between genders.