Table 1 Baseline characteristics and pre-operative values of outcomes

BMI (kg/m²)

30.1 (±4.5)

28.7 (±4.2)

Side (L/R)

22/28

25/22

AKP during chair rise (VAS 0–10 median)

5 (0–10)

4 (0–8)

AKP during chair rise (yes/no %)

80/20

85.1/14.9

AKP during stair climb (VAS 0–10 median)

5.5 (0–10)

5 (0–9)

AKP during stair climb (yes/no %)

90/10

83/17

Ability to rise from a chair (able/unable %)

72/28

82.9/17.1

Ability to climb stairs (able/unable%)

97.9/2.1

95.3/4.7

 Flexion

110 (85–140)

110 (75–140)

 Extension

−5 (−20–5)

−5 (−35–5)

 Total

105 (70–140)

110 (65–140)

 Pain

48 (11–92)

49 (11–83)

 Function

55 (0–80)

60 (0–90)

 Total

101 (31–157)

106 (25–151)

 Physical functioning

30 (5–75)

35 (5–90)

 Social role functioning

62 (0–100)

62 (0–100)

 Physical role functioning

0 (0–100)

0 (0–100)

 Emotional role functioning

33 (0–100)

50 (0–100)

 Mental health

60 (4–100)

70 (8–96)

 Vitality

50 (15–95)

55 (0–90)

 Bodily pain

40 (0–80)

40 (0–80)

 General health perceptions

60 (15–95)

62.5 (20–100)

 General health change

50 (0–75)

50 (0–100)

 30 degrees flexion

2 (0–25)

2 (−1–13)

 60 degrees flexion

2 (0–13)

2 (0–11)

90 degrees flexion

1 (0–11)

2 (0–10)

 30 degrees of flexion

2.70 ± 4.06

3.0 ± 3.39

 60 degrees of flexion

2.26 ± 2.72

2.72 ± 2.73

 90 degrees of flexion

1.58 ± 2.17

2.29 ± 2.51