Table 2 The radiographic data of “long/short screws” groups

 Pre

− 17.53 ± 5.74

− 18.62 ± 4.72

0.413

− 17.41 ± 6.75

− 17.83 ± 4.13

0.817

− 17.71 ± 3.87

− 19.91 ± 5.52

0.255

 1 month

− 5.72 ± 4.09*

− 7.31 ± 4.29*

0.133

− 4.64 ± 4.51*

− 5.78 ± 2.73*

0.353

− 7.43 ± 2.65*

− 9.82 ± 5.27*

0.152

 Final

− 7.94 ± 4.30*

− 11.14 ± 4.36*

0.004

− 7.05 ± 4.90*

− 9.83 ± 3.29*

0.046

− 9.36 ± 2.73*

− 13.27 ± 5.16*

0.023

 Pre

12.78 ± 6.27

11.17 ± 5.24

0.274

13.45 ± 6.76

11.61 ± 4.62

0.332

11.71 ± 5.47

10.45 ± 6.31

0.598

 1 month

24.22 ± 4.86*

21.79 ± 5.03*

0.053

25.68 ± 4.75*

23.50 ± 4.34*

0.142

21.93 ± 4.23*

19.09 ± 5.09*

0.141

 Final

22.03 ± 5.45*

17.59 ± 6.54*

0.004

23.59 ± 5.18*

19.72 ± 5.71*

0.031

19.57 ± 5.09*

14.09 ± 6.53

0.027

 Pre

31.36 ± 7.27

29.48 ± 7.01

0.297

31.91 ± 7.44

30.33 ± 7.01

0.498

30.50 ± 7.17

28.09 ± 7.12

0.411

 1 month

40.81 ± 6.43*

37.62 ± 7.51*

0.070

42.77 ± 5.71*

39.56 ± 7.49*

0.131

37.71 ± 6.45*

34.45 ± 6.71*

0.230

 Final

39.47 ± 6.20*

34.59 ± 7.71*

0.006

41.18 ± 5.67*

36.94 ± 7.52*

0.049

36.79 ± 6.24*

30.73 ± 6.62

0.028

 Pre

35.33 ± 8.31

34.79 ± 10.60

0.819

34.86 ± 6.69

35.39 ± 10.15

0.845

36.07 ± 10.62

33.82 ± 11.75

0.620

 1 month

34.86 ± 8.35

35.62 ± 10.78

0.750

33.64 ± 6.78

36.83 ± 10.65

0.256

36.79 ± 10.35

33.64 ± 11.19

0.473

 Final

36.56 ± 9.36

35.31 ± 10.97

0.623

35.95 ± 7.13

36.50 ± 10.70

0.848

37.50 ± 12.33

33.36 ± 11.65

0.402

 Pre

18.58 ± 8.98

17.97 ± 7.71

0.770

18.36 ± 8.97

17.17 ± 7.79

0.659

18.93 ± 9.34

19.27 ± 7.75

0.922

 1 month

16.19 ± 8.24

15.72 ± 6.79

0.806

15.82 ± 8.94

15.11 ± 6.68

0.783

16.79 ± 7.29

16.73 ± 7.18

0.984

 Final

15.58 ± 7.65

16.07 ± 6.38

0.785

15.68 ± 8.10

15.39 ± 6.34

0.901

15.43 ± 7.19

17.09 ± 6.50

0.556

 Pre

53.17 ± 13.15

53.41 ± 10.37

0.934

51.86 ± 12.75

53.39 ± 7.16

0.654

55.21 ± 13.98

53.45 ± 14.62

0.762

 1 month

51.28 ± 11.63

51.66 ± 9.57

0.889

50.36 ± 11.27

51.89 ± 7.80

0.629

52.71 ± 12.46

51.27 ± 12.36

0.776

 Final

51.56 ± 11.77

51.38 ± 9.42

0.948

50.14 ± 11.22

51.28 ± 7.55

0.715

53.79 ± 12.67

51.55 ± 12.32

0.661