Table 1 Parameters of S1-AI screw trajectory measurements (mean ± standard deviation)

57.21 ± 5.24*

55.68 ± 5.75*

0.455

59.52 ± 6.27

59.41 ± 5.35

0.760

53.06 ± 9.09

53.71 ± 9.56

0.853

57.35 ± 7.45

57.11 ± 6.78

0.927

37.01 ± 2.39

37.10 ± 2.77

0.929

36.49 ± 2.79

37.24 ± 3.56

0.538

120.96 ± 4.03*

119.27 ± 4.34*

0.281

113.25 ± 6.11

111.69 ± 6.22

0.496

41.50 ± 5.18*

42.91 ± 4.38*

0.425

39.90 ± 7.10

41.42 ± 5.58

0.520

21.64 ± 4.17*

21.83 ± 3.76*

0.897

16.83 ± 1.59

17.25 ± 1.12

0.411

8.31 ± 1.87*

8.46 ± 2.16*

0.850

5.69 ± 1.27

5.78 ± 0.86

0.687

27.50 ± 1.51*

28.04 ± 2.47*

0.486

26.20 ± 2.92

26.67 ± 2.41

0.532

27.41 ± 4.24*

27.48 ± 3.89*

0.964

22.30 ± 5.73

22.39 ± 5.41

0.851