Article Figures & Data
Figures
- Figure 1
Skin to spinous process measurements at L4 on x-ray imaging and magnetic resonance imaging.
- Figure 2
Scatter plot showing linear relationship between BMI and “skin to spinous process” measurements. BMI, body mass index.
Tables
Risk Factor Surgical Site Infection Cohort Control Group P Value Age, y, mean (SD) 48.2 (19.0) 50.1 (19.7) 0.722 Female sex, n (%) 21 (81) 21 (81) 1.00 Body mass index, mean (SD) 33.4 (9.1) 28.9 (6.9) 0.049 No. of levels, mean (SD) 4.1 (4.4) 3.5 (4.3) 0.632 Length of anesthesia, min, mean (SD) 334 (119) 354 (124) 0.552 Estimated blood loss, mL, mean (SD) 571 (459) 400 (265) 0.106 Serum glucose on day 3, mmol/L, mean (SD) 8.58 (3.5) 7.49 (1.9) 0.168 Drain use, n (%) 13 (50) 14 (54) 0.781 Days from initial procedure to reoperation, mean (SD) 21.7 (14.6) N/A N/A Skin to SP on x-ray, mm, mean (SD) 47.9 (14.9) 37.7 (17.1) 0.017 Skin to SP on sagittal MRI, mm, mean (SD) 43.5 (14.9) 35.0 (17.1) 0.062 Skin to SP on axial MRI, mm, mean (SD) 39.3 (14.2) 34.3 (16.1) 0.248 Skin to lamina on MRI, mm, mean (SD) 61.2 (16.7) 55.4 (16.5) 0.213 Abbreviations: MRI, magnetic resonance imaging; SP, spinous process.
Risk Factor OR 95% CI P Value Body mass index 1.114 1.020–1.217 0.016 Skin to SP on x-ray imaging 1.077 1.021–1.135 0.006 Skin to SP on sagittal magnetic resonance imaging 1.057 1.009–1.107 0.020 Abbreviation: SP, spinous process.
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