Table 1 Preoperative demographic data

Number of patients

50

58

Gender (female/male)

38/12

39/ 19

0.429

Age (years)

72.1 ± 7.4

71.7 ± 10.8

0.805

Body mass index (kg/m²)

25.5 ± 3.5

26.0 ± 4.4

0.533

Hip-knee-ankle angle (°)

173.3 ± 2.9

173.0 ± 3.5

0.724

Maximum extension (°)

 − 3.2 ± 3.1

 − 3.5 ± 3.7

0.706

Maximum flexion (°)

129.9 ± 7.9

128.5 ± 9.5

0.368

2011KSS

 Symptom

8.4 ± 6.4

9.1 ± 5.2

0.511

 Satisfaction

13.0 ± 7.1

13.4 ± 7.0

0.781

 Expectation

14.0 ± 1.5

13.5 ± 1.8

0.108

 Activity

46.6 ± 18.7

44.3 ± 17.0

0.517

KOOS

 Pain

48.2 ± 18.4

54.5 ± 17.3

0.071

 Symptom

57.9 ± 17.1

48.7 ± 19.5

0.009

 ADL

58.4 ± 18.1

59.3 ± 16.4

0.802

 Sports

25.4 ± 22.5

27.5 ± 21.35

0.621

 QOL

27.9 ± 16.3

30.4 ± 17.7

0.452