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Table 2 L3 lower endplate CSA, fat-free muscle CSA (mean of left and right side), intramuscular fat area (mean of left and right side), and mean normalized fat free muscle CSA of the psoas (PS), lumbar erector spinae (LES) and multifidus (MF) in lumbar discectomy patients with and without pain

From: Computed tomographic analysis of the quality of trunk muscles in asymptomatic and symptomatic lumbar discectomy patients

  Section   Muscle Discectomy, no pain Discectomy with pain
Bony CSA L3 lower endplate cm2   15,98 ± 2.70 15.30 ± 2.65
Fat-free muscle CSA L3 lower endplate Cm2 PS 21.37 ± 6.65 18.71 ± 5.56
    LES 34.57 ± 8.36 28.62 ± 6.31
    MF 13.25 ± 3.38 10.95 ± 3.44
  L4 lower endplate   PS ± ±
    LES 25.69 ± 7.16 21.79 ± 5.06
    MF 17.22 ± 3.59 14.38 ± 3.97
  L5 lower endplate   PS ± ±
    LES 14.17 ± 6.31 10,78 ± 5.03
    MF 19.49 ± 3.79 15.56 ± 3.32
Normalized fat-free L3 lower endplate   PS 1.33 ± 0.29 1.21 ± 0.24
muscle CSA    LES 2.21 ± 0.44 1.87 ± 0.34
    MF 0.83 ± 0.17 0.71 ± 0.16
  L4 lower endplate   PS ± ±
    LES 1.64 ± 0.39 1.44 ± 0.32
    MF 1.08 ± 0.18 0.94 ± 0.20
  L5 lower endplate   PS ± ±
    LES 0.90 ± 0.43 0.72 ± 0.30
    MF 1.23 ± 0.21 1.02 ± 0.15
Fat area L3 lower endplate cm2 PS 0.73 ± 0.45 0.91 ± 0.53
    LES 3.26 ± 1.28 4.34 ± 2.13
    MF 2.52 ± 1.16 3.52 ± 1.84
  L4 lower endplate   PS ± ±
    LES 1.21 ± 0.80 1.54 ± 0.87
    MF 3.65 ± 1.61 5.08 ± 2.46
  L5 lower endplate   PS ± ±
    LES 3.56 ± 1.43 5.22 ± 3.05
    MF 5.41 ± 1.87 7.19 ± 3.00
Normalized fat CSA L3 lower endplate   PS 0.05 ± 0.03 0.06 ± 0.03
    LES 0.22 ± 0.09 0.29 ± 0.17
    MF 0.16 ± 0.09 0.24 ± 0.16
  L4 lower endplate   PS ± ±
    LES 0.27 ± 0.18 0.33 ± 0.19
    MF 0.24 ± 0.12 0.35 ± 0.21
  L5 lower endplate   PS ± ±
    LES 0.22 ± 0.09 0.37 ± 0.26
    MF 0.35 ± 0.14 0.49 ± 0.25