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Abstract #5134

Dynamic Morphometric Changes in Degenerative Lumbar Spondylolisthesis: A Pilot Study of Standing Magnetic Resonance Imaging

Raphaële charest-morin1, Honglin Zhang2, Michael Bond3, Amy Phillips4, Shannon Patterson5, David Wilson3, and John Street3

1Department of Orthopaedics, Centre Hospitalier Universitaire de Québec, Quebec, QC, Canada, 2Department of Orthopaedics, University of British Columbia, Vancouver, BC, Canada, 3Department of Orthopaedics, University of British Columbia, 4Center for Hip Health and Mobility, University of British Columbia, 5Department of Radiology, Vancouver General Hospital

The planning of spine surgery for degenerative lumbar spondylolisthesis (DLS) is currently based on supine MR images while patients experience symptoms in the upright posture. This study employed an upright Open MRI to determine whether the MRI-based measurements of the spinal and neural elements used in planning surgery are different in the symptomatic, upright posture than in the supine posture. We found upright MRI scanning detected dynamic morphometric differences in a number of clinically important radiographic parameters in patients with DLS. Upright MRI may help in planning minimally invasive surgeries for DLS.

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