Figure 2.

Hemoglobin levels in total knee arthroplasty using tranexamic acid. Boxplots showing median and interquartile ranges for hemoglobin levels in each group on each hospital day are shown. Both groups experienced a fall in hemoglobin following; in this case the nonanemic patients had a significant greater fall then the anemic patients at the first postoperative day (but still had a higher median hemoglobin). None of the patients in either group required transfusion. TKA: Total knee arthroplasty.