Table 2 Radiographic parameters of recruited patients preoperatively, at immediate erect and at final follow-up

Proximal thoracic curve

27.2 ± 13.3

16.5 ± 8.2

14.8 ± 7.7

< 0.001

< 0.001

0.393

Main thoracic curve

44.1 ± 7.7

13.6 ± 7.8

13.8 ± 8.0

< 0.001

< 0.001

0.886

Lumbar curve

24.1 ± 9.3

8. 2 ± 9.2

7.0 ± 9.2

< 0.001

< 0.001

0.486

Thoracic AVT

33.0 ± 9.1

12.7 ± 6.8

14.0 ± 7.3

< 0.001

< 0.001

0.398

Lumbar AVT

13.9 ± 7.1

11.2 ± 7.6

11.4 ± 7.9

0.074

0.102

0.876

CB (C7PL-CSVL)

11.2 ± 7.9

10.7 ± 8.0

9.3 ± 7.7

0.652

0.951

0.697

L1/2 disc wedge angle

2.86 ± 4.32

0.16 ± 3.89

0.98 ± 4.80

0.002

< 0.001

0.189

L2/3 disc wedge angle

3.53 ± 4.22

0.72 ± 3.47

0.45 ± 3.16

< 0.001

< 0.001

0.706

L3/4 disc wedge angle

2.71 ± 4.55

0.49 ± 2.46

0.41 ± 3.16

0.002

0.001

0.904

L4/5 disc wedge angle

0.36 ± 3.40

0.57 ± 3.25

0.48 ± 2.78

0.735

0.843

0.888

L5/S1 disc wedge angle

2.03 ± 2.57

1.44 ± 3.12

0.67 ± 2.29

0.269

0.011

0.147

Upper coronal lumbar curve

15.87 ± 6.64

10.33 ± 5.71

5.34 ± 6.16

< 0.001

< 0.001

0.010

Lower coronal lumbar curve

5.08 ± 3.93

5.15 ± 3.70

4.46 ± 3.79

0.917

0.276

0.433