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Table 1 Comparison of radiological parameters between the PJK group and the Non-PJK group

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

 

Total

(n = 70)

Non-PJK Group

(n = 57)

PJK Group

(n = 13)

P#

TL/L Cobb angle

Preoperative

53.4 ± 8.6

53.9 ± 8.8

51.5 ± 7.9

0.374

Postoperative

6.5 ± 5.9

6.3 ± 6.1

7.5 ± 5.4

0.507

Final

7.3 ± 6.8

7.1 ± 6.9

8.4 ± 6.3

0.515

PI

45.5 ± 10.2

46.1 ± 10.1

43.1 ± 10.8

0.352

SS

Preoperative

38.0 ± 7.7

37.8 ± 7.6

38.7 ± 8.4

0.724

Postoperative

36.2 ± 6.9

36.3 ± 7.0

35.7 ± 6.4

0.761

Final

36.9 ± 7.5

37.0 ± 7.7

37.3 ± 6.5

0.827

PT

Preoperative

7.5 ± 6.9

8.2 ± 6.6

4.4 ± 7.9

0.077

Postoperative

9.3 ± 7.7

9.8 ± 7.0

7.1 ± 10.3

0.247

Final

8.7 ± 7.4

9.3 ± 7.0

5.9 ± 8.4

0.132

LL

Preoperative

52.0 ± 10.7

50.7 ± 10.5

57.7 ± 10.2

0.031

Postoperative

50.9 ± 9.0

50.1 ± 8.6

56.4 ± 8.9

0.015

Final

52.6 ± 9.5

51.1 ± 9.1

58.8 ± 8.9

0.006

GTK (T1-12)

Preoperative

28.3 ± 12.9

26.2 ± 12.0

37.6 ± 12.9

0.003

Postoperative

27.1 ± 11.3

25.3 ± 11.4

37.2 ± 6.3

0.004

Final

32.1 ± 12.9

29.6 ± 12.1

42.8 ± 10.8

< 0.001

TK (T5-12)

Preoperative

21.1 ± 10.7

18.9 ± 8.7

30.7 ± 13.4

0.001

Postoperative

20.4 ± 8.9

17.7 ± 8.5

29.3 ± 5.7

0.001

Final

24.3 ± 11.9

21.6 ± 9.4

36.0 ± 14.8

< 0.001

SVA (mm)

Preoperative

-6.9 ± 27.7

-6.5 ± 26.4

-8.5 ± 34.5

0.825

Postoperative

-9.1 ± 23.2

-10.3 ± 22.6

-3.8 ± 26.1

0.371

Final

-10.7 ± 24.7

-10.9 ± 24.7

-9.5 ± 25.4

0.844

PJA

Preoperative

9.3 ± 4.0

9.3 ± 4.3

8.8 ± 2.4

0.636

Postoperative

11.1 ± 5.7

9.9 ± 5.1

16.2 ± 5.2

< 0.001

Final

14.9 ± 8.0

12.3 ± 5.3

26.3 ± 7.6

< 0.001

PI-LL

Preoperative

-6.5 ± 11.9

-4.6 ± 10.9

-14.6 ± 13.1

0.005

Postoperative

-5.4 ± 10.3

-3.6 ± 8.8

-13.6 ± 12.4

0.001

Final

-7.0 ± 10.0

-5.0 ± 8.8

-15.7 ± 10.3

< 0.001

  1. PJK proximal junctional kyphosis; TL/L thoracolumbar/lumbar; PI pelvic incidence; LL lumbar lordosis; GTK global thoracic kyphosis; TK thoracic kyphosis; SVA sagittal vertical axis; PJA proximal junctional angle
  2. “#” comparison between the PJK group and the Non-PJK group