Table 1 The patients’ preoperative characteristics data

Demographic characteristics

  Age✝ (year)

66.2 (7.3)

67.6 (8.7)

68.1 (6.2)

0.44

  Female gender◆

43 (95.6%)

42 (93.3%)

40 (88.9%)

0.47

  Body mass index✝ (kg/m2)

26.3 (3.7)

26.2 (3.7)

27.3 (4.7)

0.37

  Estimated blood volume✝ (ml)

3146 (310)

3090 (246)

3227 (401)

0.14

  DM◆

34 (75.6%)

36 (80.0%)

34 (75.6%)

0.9

  ASA classification (II/III) (no. of patients)

29/16

20/25

20/25

0.1

Preoperative laboratory values

  Preoperative hemoglobin✝ (g/dL)

12.1 (1.1)

11.9 (1.0)

12.6 (1.3)*^c

0.02*

Surgical characteristics

  Regional anesthesia◆

42 (93%)

39 (87%)

43 (96%)

0.38

  Right side◆

26 (57.8)

25 (55.6)

23 (51.1)

0.86

  Preoperative mechanical axis◼

4.9 varus (15 varus to 8 valgus)

5.0 varus (16 varus to 13 valgus)

5.2 varus (20 varus to 6 valgus)

0.97

  Operative time✝ (minute)

79.1 (14.3)

78.8 (13.0)

81.1 (13.1)

0.65

  Surgical incision✝ (cm)

12.5 (2.2)

12.3 (2.2)

13.2 (1.2 )

0.09

Functional characteristics

  Preoperative KSK Score✝

77.3 (11.0)

76.8 (11.9)

76.4 (13.3)

0.94

  Preoperative WOMAC score✝

59.8 (9.5)

60.3 (9.8)

60.0 (9.7)

0.98