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Table 2 Comparison of radiological parameters between the low PI group and the high PI group

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

Variables Low PI (<45°) n=32 High PI (≥45°) n=38 p
PJK n=7 n=6 0.514
TL/L Cobb angle
 Preoperative 52.53±8.96 54.14±8.38 0.443
 Postoperative 6.2±5.4 6.8±6.4 0.690
 Final 7.1±6.3 7.6±7.3 0.746
 PI 37.1±6.0 52.6±7.2 <0.001
SS
 Preoperative 33.0±5.5 42.2±6.7 <0.001
 Postoperative 32.0±4.7 39.8±6.4 <0.001
 Final 32.1±6.1 40.9±6.0 <0.001
PT
 Preoperative 4.1±6.5 10.4±6.0 <0.001
 Postoperative 5.1±8.1 12.8±6.3 <0.001
 Final 5.2±8.1 11.7±5.2 <0.001
LL
 Preoperative 49.2±11.4 54.4±9.7 0.043
 Postoperative 47.5±7.9 53.9±8.9 0.002
 Final 47.6±7.6 56.7±9.0 <0.001
GTK (T1-12)
 Preoperative 28.4±14.1 28.3±12.1 0.997
 Postoperative 28.5±10.2 29.7±12.3 0.666
 Final 30.5±11.9 33.5±13.6 0.334
TK (T5-12)
 Preoperative 22.6±12.9 19.9±8.5 0.285
 Postoperative 22.7±9.0 20.42±8.9 0.299
 Final 24.6±11.1 24.1±12.8 0.868
SVA
 Preoperative -10.5±30.7 -3.9±25.1 0.330
 Postoperative -8.6±26.5 -9.6±20.5 0.886
 Final -13.1±21.2 -8.7±27.5 0.466
PJA
 Preoperative 9.3±3.7 9.3±4.4 0.949
 Postoperative 11.5±5.5 10.7±5.9 0.539
 Final 14.8±8.9 15.1±7.2 0.894
PI-LL
 Preoperative -12.1±12.3 -1.7±9.3 <0.001
 Postoperative -10.4±10.8 -1.3±7.8 <0.001
 Final -10.4±10.2 -4.2±9.0 0.009
  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