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Lumbar dorsal root ganglion displacement between supine and prone positions evaluated with 3D MRI – Lumbar Spinal Stenosis

A recent study investigated the displacement of the dorsal root ganglion (DRG) in the lumbar spine between supine and prone positions during MRI. The study involved 18 subjects who were scheduled for lumbar spine surgery. MRI scans were taken in both positions, and the displacement and cross-sectional area (CSA) of the DRGs were measured. The results showed that there was minimal displacement between the two positions, with the mean absolute displacement of less than 1 mm. The largest directional displacement was observed in the dorsal-to-ventral direction. The study concluded that there were no significant soft tissue displacement or morphological area differences between the supine and prone positions during 3D lumbar spine MRI

Summarised by Mr Mo Akmal – Lead Spinal Surgeon
The London Spine Unit : most established spine centre in UK

Published article

CONCLUSIONS: Minimal, non-statistically significant soft tissue displacement and morphological area differences were demonstrated between supine and prone positions during 3D lumbar spine MRI.

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Magn Reson Imaging. 2023 Sep 26:S0730-725X(23)00163-7. doi: 10.1016/j.mri.2023.09.006. Online ahead of print.ABSTRACTOBJECTIVE: Pre-operative lumbar spine MRI is usually acquired with the patient supine, whereas lumbar spine surgery is most commonly performed prone. For MRI to be used reliably and safely for intra-operative navigation for foraminal and extraforaminal decompression, the magnitude of dorsal root ganglion (DRG),

Magn Reson Imaging. 2023 Sep 26:S0730-725X(23)00163-7. doi: 10.1016/j.mri.2023.09.006. Online ahead of print.

ABSTRACT

OBJECTIVE: Pre-operative lumbar spine MRI is usually acquired with the patient supine, whereas lumbar spine surgery is most commonly performed prone. For MRI to be used reliably and safely for intra-operative navigation for foraminal and extraforaminal decompression, the magnitude of dorsal root ganglion (DRG) displacement between supine and prone positions needs to be understood.

METHODS: A prospective study of a degenerative lumbar spine cohort of 18 subjects indicated for lumbar spine surgery. Three-dimensional T2-weighted fast spin echo and T1-weighted spoiled gradient echo sequences were acquired at 3 T. Displacement and cross-sectional area (CSA) of the bilateral DRGs at 5 motion levels (L1-2 to L5-S1) were determined via 3D segmentation by 2 independent evaluators. Wilcoxon rank-sum tests without correction for multiple comparison were performed against hypothesized 1-mm absolute displacement and corresponding 24% CSA change.

RESULTS: DRG mean absolute displacement was <1 mm (p > 0.99, mean = 0.707 mm, 95% confidence interval (CI) = 0.659 to 0.755 mm), with the largest directional displacement in the dorsal-to-ventral direction from supine to prone (mean = 0.141 mm, 95% CI = 0.082 to 0.200 mm). Directional displacements caudal-to-cephalad were 0.087 mm (95% CI = 0.022 to 0.151 mm), and left-right were – 0.030 mm (95%CI = -0.059 to -0.001 mm). Mean CSA change was within 24% (p > 0.99, mean = -8.30%, 95% CI = -10.5 to -6.09%). Mean absolute displacement was largest for the L1 (mean = 0.811 mm) and L2 (mean = 0.829 mm) DRGs.

CONCLUSIONS: Minimal, non-statistically significant soft tissue displacement and morphological area differences were demonstrated between supine and prone positions during 3D lumbar spine MRI.

PMID:37769881 | DOI:10.1016/j.mri.2023.09.006

The London Spine Unit : most established spine centre in UK

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Lumbar dorsal root ganglion displacement between supine and prone positions evaluated with 3D MRI

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Magn Reson Imaging. 2023 Sep 26:S0730-725X(23)00163-7. doi: 10.1016/j.mri.2023.09.006. Online ahead of print.ABSTRACTOBJECTIVE: Pre-operative lumbar spine MRI is usually acquired with the patient supine, whereas lumbar spine surgery is most commonly performed prone. For MRI to be used reliably and safely for intra-operative navigation for foraminal and extraforaminal decompression, the magnitude of dorsal root ganglion (DRG)

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