Table 3 Comparison of radiological parameters in the Consistent and Contralateral groups

K-line (+)^a

6

10

0.376(χ² = 0.784)

ISI of spinal cord^a

4

7

0.465(χ² = 0.533)

Coronal canal diameter

C3

22.94 ± 1.04

22.83 ± 1.00

0.799

C4

25.24 ± 1.15

25.12 ± 1.14

0.739

C5

26.14 ± 0.78

26.08 ± 0.82

0.891

C6

25.98 ± 0.72

25.96 ± 0.74

0.922

C7

25.69 ± 1.78

25.75 ± 1.81

0.953

Center sagittal canal diameter

C3

13.71 ± 0.52

13.81 ± 0.47

0.544

C4

14.01 ± 0.94

14.06 ± 0.83

0.860

C5

13.42 ± 0.70

13.52 ± 0.75

0.830

C6

13.81 ± 0.64

13.93 ± 0.62

0.597

C7

13.77 ± 1.21

13.92 ± 1.21

0.570

Pavlov ratio

C3

0.85 ± 0.03

0.85 ± 0.03

0.922

C4

0.82 ± 0.50

0.82 ± 0.47

0.830

C5

0.82 ± 0.04

0.81 ± 0.04

0.544

C6

0.81 ± 0.04

0.82 ± 0.04

0.625

C7

0.81 ± 0.04

0.81 ± 0.04

0.922

Ossification occupancy area (mm²)

Less serious side

21.79 ± 8.59

20.94 ± 8.42

0.769

More serious side

40.07 ± 11.83^#

40.65 ± 9.56^#

0.681

C2-7 Cobb angle

Preoperative

−2.50 ± 7.15

−1.94 ± 6.76

0.830

2-year follow-up

−1.29 ± 10.46

−1.00 ± 9.65

0.922

Ossification length

Preoperative

68.77 ± 11.13

70.11 ± 9.92

0.681

2-year follow-up

74.70 ± 11.22*

76.30 ± 9.38*

0.597

Laminoplasty opening angle

C3

46.86 ± 7.31

50.18 ± 10.77

0.316

C4

49.36 ± 10.63

48.47 ± 11.63

0.860

C5

48.57 ± 10.62

48.18 ± 11.34

0.922

C6

45.36 ± 10.48

47.29 ± 11.06

0.681

C7

41.93 ± 9.77

44.76 ± 10.40

0.493

Laminoplasty opening width

C3

13.89 ± 1.68

13.94 ± 1.58

0.953

C4

14.41 ± 2.34

14.07 ± 1.93

0.769

C5

14.69 ± 2.34

14.55 ± 2.40

0.769

C6

14.68 ± 2.40

14.45 ± 2.36

0.681

C7

14.83 ± 1.76

14.48 ± 1.76

0.544

Diameter of spinal cord ratio

preoperative

0.63 ± 0.03

0.62 ± 0.03

0.297

2 years follow-up

0.90 ± 0.11*

0.77 ± 0.21*

0.000

Spinal cord shift

1.17 ± 0.33

0.80 ± 0.21

0.001