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Table 2 Comparison of preoperative and postoperative sagittal parameters depending on the preoperative SCA

From: Spino cranial angle as a predictor of loss of cervical lordosis after laminoplasty in patients with cervical myelopathy

 

Total

LS

MS

HS

Pre-SCA (°)

84.08 ± 9.68

72.52 ± 2.21

83.73 ± 4.84

97.01 ± 3.50

Post-SCA (°)

88.22 ± 9.64

78.66 ± 8.72

88.61 ± 6.41

97.58 ± 5.50

Pre-T1s (°)

25.74 ± 6.26

33.23 ± 4.32

23.78 ± 4.63

21.61 ± 3.51

Post-T1s (°)

23.94 ± 5.85

29.12 ± 4.73

22.20 ± 4.85

21.83 ± 5.59

Pre-CL (°)

15.20 ± 6.27

22.87 ± 3.21

14.25 ± 2.72

8.94 ± 5.37

Post-CL (°)

10.76 ± 5.90

14.73 ± 7.13

11.85 ± 4.15

6.95 ± 4.64

Pre-cSVA (mm)

24.66 ± 9.08

14.17 ± 4.54

25.11 ± 5.76

34.89 ± 4.66

Post-cSVA (mm)

28.66 ± 9.17

22.09 ± 5.75

27.92 ± 8.88

37.05 ± 5.88

Incidence of pre-kyphosis

0%

0%

0%

0%

Incidence of post-kyphosis

7.4%(5/68)

11.1% (2/18)

3.0% (1/33)

11.8% (2/17)

 

LS vs. MS

LS vs. HS

MS vs. HS

Pre-SCA (°)

< 0.001#

< 0.001#

< 0.001#

Post-SCA (°)

< 0.001#

< 0.001#

< 0.001#

Pre-T1s (°)

< 0.001#

< 0.001#

0.137#

Post-T1s (°)

< 0.001*

< 0.001*

0.809*

Pre-CL (°)

< 0.001*

< 0.001#

< 0.001#

Post-CL (°)

< 0.001#

< 0.001#

< 0.001#

Pre-cSVA (mm)

< 0.001#

< 0.001#

< 0.001#

Post-cSVA (mm)

< 0.001#

< 0.001#

< 0.001#

Incidence of postoperative kyphosis

0.280

1.000

0.264

  1. SCA spino cranial angle, T1s T1-slope, CL C2–7 lordosis angle, cSVA C2–7 sagittal vertical axis, LS low SCA, MS middle SCA, HS HIGH SCA
  2. *Independent t-test
  3. #Mann–Whitney U test
  4. Fisher’s Exact test