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Table 3 Comparison of radiological parameters between PJK and non-PJK patients with low PI

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

Low PI (PI < 45°) n=32 Non-PJK Group n=25 PJK Group n=7 p
PI 37.8±6.2 34.3±4.4 0.169
SS
 Preoperative 33.1±6.2 32.7±1.6 0.688
 Postoperative 31.5±4.5 33.5±5.5 0.336
 Final 31.4±6.3 34.4±5.4 0.266
PT
 Preoperative 4.7±6.8 1.6±5.2 0.267
 Postoperative 6.4±6.8 0.7±6.8 0.059
 Final 6.6±8.3 0.1±5.1 0.059
LL
 Preoperative 47.3±11.4 55.5±8.9 0.095
 Postoperative 45.7±6.9 53.6±8.5 0.017
 Final 45.5±6.2 54.8±7.7 0.003
 Δ LL (post-pre) -1.6±11.4 -1.8±9.0 0.958
 Δ LL (final-pre) -1.8±11.0 -0.6±7.7 0.804
GTK (T1-12)
 Preoperative 24.5±11.8 42.2±13.4 0.002
 Postoperative 25.9±9.6 37.8±6.0 0.004
 Final 27.4±10.9 41.5±8.7 0.004
 Δ T1-12 (post-pre) 1.3±10.9 -4.3±15.6 0.273
 Δ T1-12 (final-pre) 2.9±9.9 -0.7±13.3 0.438
TK (T5-12)
 Preoperative 18.8±9.1 36.2±15.8 0.001
 Postoperative 17.3±8.2 31.0±6.6 0.004
 Final 21.3±8.7 36.2±11.4 0.001
 Δ T5-12 (post-pre) -1.4±8.1 -5.1±13.1 0.105
 ΔT5-12 (final-pre) 2.4±8.0 0.01±11.0 0.514
SVA (mm)
 Preoperative -9.2±30.5 -15.2±33. 0.654
 Postoperative -11.4±25.5 1.5±29.5 0.262
 Final -15.4±20.4 -4.8±23.5 0.251
PJA
 Preoperative 9.3±4.0 9.2±1.8 0.941
 Postoperative 9.9±4.5 17.1±5.2 0.001
 Final 11.3±5.2 27.2±8.1 <0.001
 Δ PJA (final-pre) 1.9±4.2 18.0±7.7 <0.001
PI-LL
 Preoperative -9.5±11.5 -21.1±10.9 0.024
 Postoperative -7.8±9.5 -19.4±10.6 0.009
 Final -7.5±8.7 -20.3±9.3 0.002
 Δ PI-LL (post-pre) 1.7±11.0 1.7±9.0 0.987
 Δ PI-LL (final-pre) 1.9±10.8 0.8±7.8 0.804
UIV    0.401
 UIV above apex of TK 9 4  
 UIV below apex of TK 16 3  
  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; UIV upper instrumented vertebra