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Table 4 Comparison of radiological parameters between PJK and non-PJK patients with high PI

From: Proximal junctional kyphosis in Lenke 5 AIS patients: the important factor of pelvic incidence

High PI (≥45°) n=38

Non-PJK Group n=32

PJK Group n=6

p

PI

52.5±7.6

53.4±4.9

0.779

SS

 Preoperative

41.6±6.4

45.7±7.7

0.169

Postoperative

40.1±6.4

38.2±7.0

0.524

 Final

41.0±6.0

40.7±6.4

0.912

PT

 Preoperative

10.9±5.1

7.7±9.6

0.461

 Postoperative

12.5±5.9

14.5±8.7

0.482

 Final

11.5±5.1

12.7±6.2

0.604

LL

 Preoperative

53.2±9.0

60.3±11.7

0.098

 Postoperative

52.8±8.9

59.5±8.9

0.086

 Final

55.3±8.6

63.8±8.3

0.003

 Δ LL (post-pre)

-0.4±7.9

-0.7±15.2

0.927

 Δ LL (final-pre)

2.1±8.1

3.4±14.4

0.756

GTK (T1-12)

 Preoperative

27.6±12.2

32.2±11.1

0.394

 Postoperative

28.3±12.7

36.4±7.0

0.143

 Final

35.4±12.7

44.4±13.5

0.030

 Δ T1-12 (post-pre)

0.7±7.9

4.20±7.31

0.337

 ΔT1-12 (final-pre)

7.8±8.3

12.1±15.7

0.061

TK (T5-12)

 Preoperative

19.0±8.5

24.3±6.6

0.163

 Postoperative

17.8±8.9

22.2±3.9

0.036

 Final

28.8±10.1

35.8±19.3

0.012

 Δ T5-12 (post-pre)

-1.2±7.6

-2.1±7.7

0.409

 ΔT5-12 (final-pre)

9.8±9.7

11.5±19.7

0.336

SVA (mm)

 Preoperative

-4.5±22.9

-0.7±37.1

0.732

 Postoperative

-9.5±20.5

-10.1±22.5

0.946

 Final

-7.6±27.6

-14.9±28.6

0.555

PJA

 Preoperative

9.4±4.5

8.3±3.0

0.568

 Postoperative

9.8±5.6

15.2±5.5

0.036

 Final

13.1±5.3

25.3±7.5

<0.001

 Δ PJA (final-pre)

3.6±3.8

17.0±8.0

<0.001

PI-LL

 Preoperative

-0.7±8.6

-6.9±11.7

0.135

 Postoperative

-0.2±6.6

-6.8±11.3

0.220

 Final

-2.9±8.5

-10.4±9.2

0.058

UIV

  

0.038

 UIV above apex of TK

11

5

 

 UIV below apex of TK

21

1

 
  1. PJK proximal junctional kyphosis; PI pelvic incidence; SS sacral slope; PT pelvic tilt; LL lumbar lordosis; GTK global thoracic kyphosis; TK thoracic kyphosis; SVA sagittal vertical axis; PJA proximal junctional angle