Table 2 Results of univariate analysis for supplementary posterior instrumentation in treating thoracolumbar burst fractures
Risk factors | Number of SPI ( n = 27) | Number of no SPI ( n = 211) | p value |
|---|---|---|---|
Gender | Â | Â | Â |
 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 | Â | Â | Â |
 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 | Â | Â | Â |
 Autograft | 17 | 145 |  |
 Artificial graft | 10 | 66 | 0.221 |
Fracture age (days) | 12.4 ± 8.1 | 9.5 ± 4.1 | 0.081 |