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Table 1 Comparison of detection indexes among groups A, B, and C

From: RETRACTED ARTICLE: The effect of drainage tube on bleeding and prognosis after total knee arthroplasty: a prospective cohort study

  Group A Group B Group C
Patients (M/F) 1/5 3/3 0/6
Operation time (min) 66.17 ± 11.62 66.83 ± 16.50 71.67 ± 13.44
Blood loss    
Total blood loss (mL) 243 ± 51.30 270.50 ± 66.11 252 ± 25.13
Intraoperative blood loss 105 ± 57.95 81.67 ± 57.92 99.17 ± 48.85
Hidden blood loss 121.50 ± 43.32 33 ± 25.44** 71.83 ± 54.66
Drainage volume (mL)   159.17 ± 38.49# 77.5 ± 33.13
VAS    
6 h 2 2 2
12 h 1 1.3 ± 0.47 0.83 ± 0.37
24 h 0.17 ± 0.37 0.5 ± 0.76 0
Complications    
Arthrocele (n) 4 1** 1**
Ecchymosis (n) 2 0 1
ROM (postoperative)    
2 days 27.5° ± 5.59° 32.5° ± 5.59° 32.5° ± 5.59°
3 days 55° ± 7.07° 66.67° ± 9.43°* 63.33° ± 4.71°*
HSS knee score 83 ± 7 82 ± 5 85 ± 5
  1. *P < 0.05 vs. group A; **P < 0.01 vs. group A; #P < 0.05 group B vs. group C. Group A, no placement of drainage tube; group B, negative pressure drainage; group C, 4 h clamping of drainage.