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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