Table 1 The preoperative characteristics are depicted in this table. The p-value shows the homogeneity of the three groups regarding age, BMI, gender and preoperative coronal deformity and significant difference regarding surgeons experience and used implant

n=

159

54

52

53

n.a.

age (years mean (SD))

70 (10.1)

71 (9.1)

69 (10.)5

69 (10.6)

0.56

BMI (kg/m²; mean (SD))

30 (5.8)

30 (5.8)

31 (5.3)

29 (6.2)

0.482

Gender (n = f/m)

98/61

34/20

33/19

31/22

0.632

Varus n=

118

36

41

41

0.292

Varus degrees mean (SD)

13.0 (2.8)

12.6 (2.1)

13.0 (3.0)

13.8 (2.9)

0.13

Valgus n=

41

18

11

12

0.292

Valgus degrees mean (SD)

−13.0 (2.9)

−13.3 (3.6)

−12.8 (2.2)

−11.3 (1.7)

0.13

Surgeon’s experience >100 TKA

104

30

24

50

<0.001

Surgeon’s experience 50 to 100 TKA

55

24

28

3

<0.001

Zimmer NexGen n=

88

39

49

0

<0.001

Zimmer SAL n=

15

15

0

0

< 0.001

Global Medacta Knee n=

56

0

3

53

<0.001