Table 2 Preoperative demographic data of the patients

Age ^a (years)

70.1 ± 6.9

69.0 ± 7.0

0.42

Gender^b (male: female)

9: 41

7: 43

0.59

Surgical side^b (left: right)

28: 22

22: 28

0.23

BMI^a (kg/m²)

25.4 ± 2.6

24.5 ± 2.5

0.09

ASA^b (I: II: III)

0: 35: 15

4: 35: 11

0.10

Underlying disease

 Hypertension^b

39

31

0.08

 Diabetes mellitus^b

8

7

0.78

 Dyslipidemia^b

25

32

0.16

 Others^b

11

9

0.71

Thigh circumference^a (cm)

42.5 ± 3.1

42.5 ± 4.3

0.99

Knee circumference^a (cm)

37.7 ± 2.6

37.9 ± 2.8

0.71

Calf circumference^a (cm)

32.6 ± 2.7

32.5 ± 3.3

0.86

Mechanical axis^a (^o)

varus 10.3 ± 10.1

varus 9.5 ± 6.3

0.67

Preoperative KSS^a

41.8 ± 12.1

43.5 ± 13.6

0.53

Hemoglobin^a (g/dL)

12.8 ± 0.9

12.7 ± 1.1

0.88

Hematocrit^a (%)

38.7 ± 2.8

38.6 ± 3.0

0.86