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Table 2 Postoperative data for all patients

From: Intra-articular injection of tranexamic acid via a drain plus drain-clamping to reduce blood loss in cementless total knee arthroplasty

Parameter Study group (n = 70) Control group (n = 70) P value
Operative time (min) 68.8 ± 14.2 82.7 ± 16.8 < 0.001
Postoperative Hb (g/dl)
POD 1 11.3 ± 1.2 11.1 ± 1.3 NS
POD 7 10.7 ± 1.3 10.1 ± 1.1 < 0.001
POD 14 10.9 ± 1.1 10.7 ± 1.0 NS
Blood loss (ml)
Drained 271.1 ± 201.8 506.4 ± 256.8 < 0.001
Total 633.8 ± 317.2 1276.0 ± 327.1 < 0.001
Transfusions    
Autologous (ml) 40.0 ± 120.9 264.1 ± 195.5 < 0.001
Allogeneic (units) 0.2 ± 0.7 1.1 ± 1.7 < 0.001
Transfusion rate (%)
Autologous 10.0 65.7 < 0.001
Allogeneic 10.0 31.4 < 0.001
D-dimer level 7days after surgery (μg/ml) 6.8 ± 2.4 7.7 ± 3.8 0.042
  1. Results are the mean ± SD.