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Table 4 The analysis of risk factors for L4/5 and L5S1 discs

From: Risk factor analysis of disc and facet joint degeneration after intersegmental pedicle screw fixation for lumbar spondylolysis

  L4/5 L5S1
Degeneration No change   p value Degeneration No change   p value
Age (y) 25.60 ± 5.46 22.47 ± 4.42 1.479 0.145 23.00 ± 5.15 22.73 ± 4.55 0.123 0.903
BMI 22.34 ± 1.97 22.86 ± 0.91  − 1.070 0.290 22.69 ± 0.51 22.82 ± 1.08  − 0.257 0.799
Fixed time (m) 17.60 ± 1.97 16.98 ± 6.51 0.202 0.841 15.20 ± 4.97 17.29 ± 6.61  − 0.684 0.497
Vertebral slip (n) 5 49 0.117 0.732 5 49 0.000* 1.000
yes 1 19    2 18   
no 4 30    3 31   
Facet grade pre-operation 5 49 2.305 0.310    1.870 0.641
Grade 4 0 13    4 7   
Grade 3 5 28    7 14   
Grade 2 0 8    4 9   
Grade 1 0 0    1 8   
Grade 0 0 0    0 0   
Disc grade pre-operation 5 49 3.094 0.347 5 49 6.854 0.113
Grade 1 2 9    3 10   
Grade 2 2 26    0 22   
Grade 3 0 10    2 10   
Grade 4 1 4    0 6   
Grade 5 0 0    0 1   
  1. BMI, Body Mass Index
  2. *Test was considered statistically significant at p < 0.05