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Table 1 The baseline characteristics of the patients underwent routine primary TKA

From: Tourniquet use in routine primary total knee arthroplasty is associated with a higher transfusion rate and longer postoperative length of stay: a real-world study

Baseline Characteristics

No Tourniquet (n = 1423)

Tourniquet use (n = 4902)

All patients (n = 6325)

P values

Demographic characteristics

 Age (M ± SD)

66.67 ± 8.77

66.58 ± 8.74

66.60 ± 8.75

0.722

 Female, N (%)

1099 (77.23%)

3872 (78.99%)

4971 (78.59%)

0.155

 BMI

24.89 ± 3.56

25.83 ± 3.5.36

25.62 ± 5.02

0.000*

 Diagnoses, N (%)

   

0.145

  OA

1321 (92.83%)

4603 (93.90%)

5924 (93.66%)

 

  Inflammatory arthritis

102 (7.17%)

299 (6.10%)

401 (6.34%)

 

 Comorbidities, N (%)

  Hypertension

224 (15.74%)

1483 (30.25%)

1707 (26.99%)

0.000*

  Type 2 diabetes

51 (3.58%)

382 (7.79%)

433 (6.85%)

0.000*

  CHD

15 (1.05%)

202 (4.13%)

217 (3.43%)

0.000*

  COPD

4 (0.28%)

30 (0.61%)

34 (0.54%)

0.133

 Preoperative analgesic use N (%)

241 (16.94%)

1551 (31.64%)

1792 (28.33%)

0.000*

 Preoperative laboratories

  Preoperative Hb (g/L)

128.54 ± 15.24

132.04 ± 16.02

131.25 ± 15.91

0.000*

  Preoperative ALB (g/L)

41.72 ± 2.54

40.86 ± 2.98

40.83 ± 2.89

0.095

 Operative variables

  Anesthesia, N (%)

   

0.000*

   General

1271 (89.32%)

3056 (62.34%)

4327 (68.41%)

 

   Regional

152 (10.68%)

1846 (37.66%)

1998 (31.59%)

 

  ASA class, N (%)

   

0.007*

    < 3

1303 (91.57%)

4367 (89.09%)

5670 (89.64%)

 

    ≥ 3

120 (8.43%)

535 (10.91%)

655 (10.36%)

 

  TXA use N (%)

639 (44.91%)

2758 (56.26%)

3397 (53.71%)

0.000*

  Drain use, N (%)

564 (39.63%)

3976 (81.11%)

4540 (71.78%)

0.000*

  Intraoperative blood loss (mL)

168.43 ± 100.56

166.55 ± 97.71

166.97 ± 98.36

0.526

  Operative time (min)

81.60 ± 27.28

87.32 ± 29.51

86.03 ± 29.12

0.000*

  1. BMI body mass index; OA osteoarthritis; CHD coronary heart disease; COPD chronic obstructive pulmonary disease; Hb hemoglobin; ALB albumin; ASA American Society of Anesthesiologists; TXA tranexamic acid. *: p < 0.05