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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