Skip to main content

Table 6 Stratification by change in sagittal vertical axis (SVA): comparison of baseline and postoperative spino-pelvic parameters and their respective pre-to post-op change

From: Cervical spine alignment following surgery for adolescent idiopathic scoliosis (AIS): a pre-to-post analysis of 81 patients

 

Stratification by change in SVA

Baseline

Post-OP

Change (Δ)

Decrease

Stable

Increase

p

Decrease

Stable

Increase

p

Decrease

Stable

Increase

p

SS

40.6 ± 10.4

43.7 ± 9.0

37.9 ± 11.9

0.131

40.6 ± 10.6

43.6 ± 10.4

39.1 ± 12.3

0.344

0.1 ± 6.4

−0.2 ± 5.8

1.2 ± 7.8

0.739

PT

9.5 ± 8.2

12.4 ± 9.0

14.3 ± 7.0

0.072

9.2 ± 10.2

12.0 ± 8.3

13.5 ± 8.2

0.195

−0.2 ± 6.6

− 0.5 ± 5.7

− 0.8 ± 7.1

0.940

PI

50.0 ± 12.9

56.2 ± 13.4

52.2 ± 14.5

0.287

49.9 ± 12.4

55.6 ± 12.6

52.6 ± 14.8

0.334

−0.2 ± 1.9

−0.6 ± 1.9

0.3 ± 2.0

0.198

PI-LL

−7.2 ± 17.0

−3.8 ± 9.6

−3.6 ± 10.6

0.512

−10.5 ± 13.3

−5.1 ± 11.5

1.7 ± 11.8

0.001

−3.3 ± 10.4

− 1.3 ± 8.5

5.3 ± 10.7

0.004

LL

57.3 ± 13.8

60.0 ± 9.7

55.8 ± 14.3

0.504

60.4 ± 10.9

60.7 ± 11.8

50.8 ± 15.0

0.006

3.1 ± 10.1

0.7 ± 8.2

−5.0 ± 10.9

0.008

TK

−43.5 ± 22.5

−37.2 ± 9.7

−30.5 ± 13.5

0.012

−45.6 ± 18.5

−41.6 ± 10.1

−33.8 ± 11.9

0.007

−2.0 ± 14.1

−4.4 ± 10.9

−3.4 ± 10.1

0.766

SVA

32.6 ± 44.9

1.4 ± 33.0

−26.3 ± 39.0

0.000

−19.9 ± 36.5

−5.1 ± 36.0

19.6 ± 51.4

0.003

−52.4 ± 25.8

−6.6 ± 7.8

45.9 ± 34.2

0.000

T1SPI

−1.1 ± 4.3

−4.2 ± 3.2

− 6.9 ± 3.1

0.000

−5.7 ± 4.1

− 4.7 ± 3.2

−2.8 ± 4.1

0.022

− 4.6 ± 3.5

−0.5 ± 1.5

4.0 ± 2.9

0.000

TPA

8.4 ± 7.8

8.3 ± 7.8

7.5 ± 7.1

0.897

3.6 ± 8.9

7.3 ± 7.5

10.7 ± 8.5

0.007

−4.8 ± 4.6

−0.9 ± 4.4

3.2 ± 6.2

0.000

T1Slope

26.5 ± 12.9

21.6 ± 8.9

14.6 ± 10.7

0.000

24.7 ± 14.3

25.1 ± 7.5

20.9 ± 10.6

0.311

−1.7 ± 7.9

3.5 ± 6.8

6.3 ± 6.6

0.000

C2-C7

4.0 ± 22.0

−1.7 ± 9.8

−7.0 ± 13.8

0.050

5.5 ± 17.7

4.3 ± 12.4

−0.6 ± 13.5

0.280

2.9 ± 14.1

5.9 ± 14.5

7.6 ± 12.3

0.444

C2-C7 SVA

36.7 ± 13.9

36.1 ± 14.6

25.0 ± 18.2

0.013

35.1 ± 19.0

35.9 ± 12.7

31.7 ± 17.6

0.635

−1.5 ± 13.6

−0.5 ± 14.2

7.6 ± 12.9

0.034

C2-T3

2.0 ± 27.2

−6.8 ± 10.8

−11.1 ± 14.7

0.044

−3.7 ± 22.1

−5.0 ± 12.0

−4.9 ± 13.0

0.954

−4.2 ± 17.7

2.7 ± 14.7

7.1 ± 11.2

0.023

C2-T3 SVA

62.2 ± 23.3

57.3 ± 21.9

40.9 ± 21.2

0.002

61.4 ± 32.7

63.0 ± 17.5

54.5 ± 23.4

0.445

−0.8 ± 18.3

4.8 ± 12.5

14.9 ± 13.0

0.001

C2-T1 – H

13.2 ± 26.8

7.0 ± 10.0

2.1 ± 15.3

0.117

14.5 ± 22.4

16.6 ± 14.0

7.8 ± 14.7

0.189

2.6 ± 17.6

11.0 ± 12.6

6.2 ± 13.1

0.219

C2Slope

21.6 ± 14.8

23.7 ± 9.3

21.0 ± 10.2

0.737

19.7 ± 13.6

20.7 ± 8.4

21.4 ± 11.2

0.860

−3.0 ± 10.5

−3.3 ± 13.1

0.0 ± 10.6

0.515

C0Slope

−1.4 ± 7.6

3.0 ± 6.9

−3.1 ± 5.1

0.054

−1.3 ± 6.8

−1.7 ± 4.5

−4.0 ± 13.2

0.672

−1.0 ± 7.7

−7.3 ± 8.4

−6.8 ± 9.0

0.200

C0-C2

19.1 ± 11.7

24.1 ± 7.4

24.3 ± 6.7

0.238

18.8 ± 11.3

20.8 ± 7.1

24.9 ± 7.4

0.183

−3.6 ± 8.2

−3.8 ± 9.5

1.6 ± 5.5

0.351

MGSlope

2.7 ± 6.4

9.3 ± 6.8

2.1 ± 4.2

0.011

4.3 ± 6.0

4.0 ± 5.2

1.1 ± 13.3

0.593

−0.8 ± 7.6

−8.6 ± 9.0

−8.1 ± 8.7

0.123

  1. SS sacral slope, PT pelvic tilt, PI Pelvic incidence, LL (L1 – S1) lumbar lordosis measured from L1 to S1, PI-LL pelvic incidence minus lumbar lordosis mismatch, TK (TK 2 – TK 12) thoracic kyphosis measured from TK 2 to TK 12, SVA sagittal vertical axis, T1SPi T1 spinopelvic inclination, TPA T1 pelvic angle; cranial: MGS McGregor Slope (line). C0S C0 Slope, C2S C2 Slope, C2-C0 angle; C2-C7 angle, C2-C7 SVA (SVA sagittal vertical axis), C2-T3angle, C2-T3 SVA (SVA sagittal vertical axis), T1 Slope, MGS McGregor Slope (line); Δ parameter change pre- to post-operatively; data expressed as mean ± standard deviation; p statistical significance, p < 0.05