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Table 2 Results of univariate analysis for supplementary posterior instrumentation in treating thoracolumbar burst fractures

From: Multivariate analysis of risk factors for predicting supplementary posterior instrumentation after anterolateral decompression and instrumentation in treating thoracolumbar burst fractures

Risk factors Number of SPI ( n = 27) Number of no SPI ( n = 211) p value
Gender    
 Male 7 53  
 Female 20 158 0.564
Age 67.1 ± 11.5 57.3 ± 14.5 0.021
BMI 29.4 ± 15.5 26.4 ± 8.5 0.712
ASIA in admission 4.1 ± 1.0 4.0 ± 1.0 0.340
ASIA in follow-up 4.5 ± 0.7 4.4 ± 0.7 0.181
Residual canal (%) 43.1 ± 13.4 45.6 ± 14.5 0.091
Angulation in admission 5.6 ± 12.5 7.4 ± 12.1 0.440
Angulation in follow-up 1.5 ± 6.1 1.4 ± 4.2 0.500
Disruption of PLC 19 42 0.000
Fracture level    
 T10 1 14  
 T11 5 46 0.109
 T12 5 51 0.337
 L1 14 64 0.015
 L2 2 36 0.260
Kinds of graft    
 Autograft 17 145  
 Artificial graft 10 66 0.221
Fracture age (days) 12.4 ± 8.1 9.5 ± 4.1 0.081
  1. SPI supplementary posterior instrumentation, PLC posterior longitudinal ligament complex, BMI body mass index, ASIA America Spinal Injury Association, PLC posterior longitudinal ligament complex, T thoracic, L lumbar.