Article Figures & Data
Figures
- Figure 1
Scheme of the spinal canal areas measurement: 1. Cross-sectional area of lateral channel; 2. Cross-sectional area of dural sac.
- Figure 2
Measurements of linear sizes of the spinal canal. 1. Depth of the lateral recess; 2. Ligamentous interfacet distance; 3. Anterio-posterior diameter of dural sac; 4. Transverse diameter of dural sac; 5. Angle of the lateral recess.
Tables
Criteria Total cross-sectional area Cross-sectional area of dural sac Cross-sectional area of left lateral canal Cross-sectional area of right lateral canal Total cross-sectional area of lateral canals Anterio-posterior diameter of dural sac Transverse diameter of dural sac Ligamentous interfacet distance Depth of the right lateral recess Depth of the left lateral recess Angle of the right lateral recess Angle of the left lateral recess Level of measuring Total cross-sectional area 1 0.97 0.75 0.71 0.84 0.69 0.57 0.64 0.54 0.65 0.07 0.02 -0.51 Cross-sectional area of dural sac 0.97 1 0.64 0.62 0.73 0.73 0.53 0.64 0.53 0.62 0.1 0.01 -0.52 Cross-sectional area of left lateral channel 0.75 0.64 1 0.51 0.89 0.4 0.48 0.36 0.33 0.61 -0.1 0.18 -0.27 Cross-sectional area of right lateral channel 0.71 0.62 0.51 1 0.84 0.34 0.48 0.48 0.53 0.4 0.01 -0.1 -0.28 Total cross-sectional area of lateral canals 0.84 0.73 0.89 0.84 1 0.43 0.55 0.48 0.48 0.59 0 0.03 -0.32 Anterio-posterior diameter of dural sac 0.69 0.73 0.4 0.34 0.43 1 0.21 0.42 0.14 0.23 0.07 -0.1 -0.28 Transverse diameter of dural sac 0.57 0.53 0.48 0.48 0.55 0.21 1 0.59 0.48 0.53 0.26 0.15 -0.31 Ligamentous interfacet distance 0.64 0.64 0.36 0.48 0.48 0.42 0.59 1 0.3 0.3 0 -0.1 -0.47 Depth of the right lateral recess 0.54 0.53 0.33 0.53 0.48 0.14 0.48 0.3 1 0.72 0.4 0.13 -0.15 Depth of the left lateral recess 0.65 0.62 0.61 0.4 0.59 0.23 0.53 0.35 0.72 1 0.2 0.14 -0.37 Angle of the right lateral recess 0.07 0.1 -0.1 0.01 0 0.07 0.26 0 0.4 0.2 1 0.25 -0.12 Angle of the left lateral recess 0.02 0.01 0.18 -0.2 0.03 -0.1 0.15 -0.1 0.13 0.14 0.25 1 -0.14 Level of measuring -0.51 -0.52 -0.27 -0.28 -0.32 -0.28 -0.31 -0.48 -0.15 -0.37 -0.12 -0.14 1 Group 1 Group 2 Group 3 Patients 19 16 1 Mean CS 0.15 0.21 0.26 Mean ODI 0.62 0.59 0.4 Mean SSQ 0.76 0.74 0.42 Ranks Subgroup No. N Mean Rank Sum of Ranks ODI 1.00 20 21.93 438.50 2.00 16 14.22 227.50 Total 36 SSS 1.00 20 21.80 436.00 2.00 16 14.38 230.00 Total 36 mCS 1.00 20 10.50 210.00 2.00 16 28.50 456.00 Total 36 Test Statisticsq ODI SSS mCS Mann-Whitney U 91.50 94.00 000 Wilcoxon W 227.500 230.000 210.000 Z -2.191 -2.108 -5.116 Asymp. Sig (2-tailed) .028 .035 .000 ↵a Grouping Variable: Subgroup Number
ODI – Oswestry Disability Index. SSQ – Swiss Spinal Stenosis Questionnaire. mCS – Mean Coefficient of Stenosis.
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