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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