In Vivo MRI Measurement of Spinal Cord Displacement in the Thoracolumbar Region of Asymptomatic Subjects with Unilateral and Sham Straight Leg Raise Tests
| Autor: | Marinko Rade, Markku Kankaanpää, Jarkko Marttila, Olavi Airaksinen, Ritva Vanninen, M. Könönen, Michael Shacklock |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Straight leg raise
Male Vertebrae Knees lcsh:Medicine Nervous System Diagnostic Radiology 0302 clinical medicine Medicine and Health Sciences lcsh:Science Musculoskeletal System Multidisciplinary Lumbar Vertebrae medicine.diagnostic_test Nerves Radiology and Imaging Anatomy Magnetic Resonance Imaging medicine.anatomical_structure Spinal Cord Legs Female Research Article Adult animal structures Imaging Techniques Movement Lumbar vertebrae Research and Analysis Methods Spinal Cord Diseases Thoracic Vertebrae Pelvis 03 medical and health sciences Sciatic Nerves Diagnostic Medicine medicine Humans Spinal canal Displacement (orthopedic surgery) Knee 030203 arthritis & rheumatology Leg Hip business.industry lcsh:R Limbs (Anatomy) Thoracolumbar Region Biology and Life Sciences Spinal cord Spine Conus medullaris Neuroanatomy Spinal Nerves SLR Sciatica low back pain MR Spinal cord nerve root Thoracic vertebrae lcsh:Q business 030217 neurology & neurosurgery Neuroscience |
| Zdroj: | PLoS ONE PLoS ONE, Vol 11, Iss 6, p e0155927 (2016) |
| ISSN: | 1932-6203 |
| Popis: | Background Normal displacement of the conus medullaris with unilateral and bilateral SLR has been quantified and the "principle of linear dependence" has been described. Purpose Explore whether previously recorded movements of conus medullaris with SLRs are i) primarily due to transmission of tensile forces transmitted through the neural tissues during SLR or ii) the result of reciprocal movements between vertebrae and nerves. Study design Controlled radiologic study. Methods Ten asymptomatic volunteers were scanned with a 1.5T magnetic resonance (MR) scanner using T2 weighted spc 3D scanning sequences and a device that permits greater ranges of SLR. Displacement of the conus medullaris during the unilateral and sham SLR was quantified reliably with a randomized procedure. Conus displacement in response to unilateral and sham SLRs was quantified and the results compared. Results The conus displaced caudally in the spinal canal by 3.54±0.87 mm (mean±SD) with unilateral (p≤.001) and proximally by 0.32±1.6 mm with sham SLR (p≤.542). Pearson correlations were higher than 0.99 for both intra- and inter-observer reliability and the observed power was 1 for unilateral SLRs and 0.054 and 0.149 for left and right sham SLR respectively. Conclusions Four relevant points emerge from the presented data: i) reciprocal movements between the spinal cord and the surrounding vertebrae are likely to occur during SLR in asymptomatic subjects, ii) conus medullaris displacement in the vertebral canal with SLR is primarily due to transmission of tensile forces through the neural tissues, iii) when tensile forces are transmitted through the neural system as in the clinical SLR, the magnitude of conus medullaris displacement prevails over the amount of bone adjustment. |
| Databáze: | OpenAIRE |
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