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Table 2 Comparative analysis of pre- versus post-operative paraspinal muscle volume on MRI and CT

From: Paraspinal muscle changes after single-level posterior lumbar fusion: volumetric analyses and literature review

 MRI (n = 24)p-valueCT (n = 16)p-value
prepostprepost
MF (cm3 ± SD)
 Right33.08 ± 3.8919.66 ± 1.690.003a34.25 ± 3.6527.63 ± 3.650.005a
 Left33.83 ± 3.4520.11 ± 2.08< 0.001a34.67 ± 3.5326.71 ± 3.28< 0.001a
ES (cm3 ± SD)
 Right90.83 ± 6.7982.90 ± 6.960.12171.47 ± 9.0549.54 ± 6.88< 0.001a
 Left85.24 ± 6.4578.76 ± 6.190.24466.15 ± 9.7053.75 ± 8.600.019
Psoas (cm3 ± SD)
 Right59.96 ± NA59.82 ± NA0.511b68.25 ± NA72.77 ± NA0.352b
 Left63.59 ± 5.2464.41 ± 5.930.76863.79 ± 7.0867.60 ± 7.440.142
Height of vertebrae5.73 ± 0.485.81 ± 0.380.1775.58 ± 0.395.63 ± 0.370.181
  1. MRI magnetic resonance imaging, CT computed tomography, SD, standard deviation, MF multifidus, ES erector spinae, NA not applicable
  2. a Statistically significant difference was defined as p < 0.00714 (0.05/7) by Bonferroni correction
  3. b Wilcoxon signed ranks test was used because the data was not normally distributed