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Table 1 Comparison of preoperative demographic and radiological data between PJK group and non-PJK group

From: Proximal junctional kyphosis is a compensation for post-operative negative C2-FH in ASD patients: a cross-sectional study

Parameters

Non-PJK group (n = 44)

PJK group (n = 24)

p value

Age

57.27 ± 6.51

62.25 ± 5.62

0.200

Female (%)

40 (90.9%)

22 (91.7%)

0.835

BMI (kg/m2)

25.21 ± 3.58

26.95 ± 3.46

0.057

HU value

150.0 ± 56.02

138.0 ± 59.19

0.411

Menopause

26 (65.0%)

18 (81.8%)

0.176

Follow-up (years)

3.67 ± 1.05

3.92 ± 0.87

0.428

LIV

   

 L5

24 (54.5%)

8 (33.3%)

 S1

12 (27.3%)

4 (16.7%)

 S2

8 (18.2%)

12 (50%)

 S1 + S2

20 (45.5%)

16 (66.7%)

0.094

Fusion levels

6.91 ± 1.81

8.33 ± 1.37

0.115

C2-FH (mm)

− 6.93 ± 42.15

11.63 ± 35.91

0.116

TK (°)

21.49 ± 12.69

18 ± 13.83

0.652

CL (°)

16.17 ± 11.81

31.8 ± 25.78

0.114

LL (°)

27.4 ± 15.51

14.2 ± 30.14

0.276

SVA (mm)

39.64 ± 41.79

72.08 ± 62.02

0.022***

TPA (°)

21.58 ± 6.94

27.9 ± 5.75

0.384

PI (°)

49.67 ± 9.33

46.55 ± 4.36

0.538

PT (°)

24.23 ± 6.41

31.33 ± 4.77

0.416

SS (°)

25.45 ± 11.15

15.23 ± 5.46

0.215

  1. C2-FH the distance between C2 vertical line to the femoral heads, CL cervical lordosis, TK thoracic kyphosis, LL lumbar lordosis, PT pelvic tilt, PI pelvic incidence, SS sacral slope, SVA sagittal vertical axis, TPA T1-Pelvic angle, HU Hounsfield unit, *** p<0.05