Segmental variations in facet joint translations during in vivo lumbar extension

Journal of Biomechanics
Ryan M ByrneXudong Zhang

Abstract

The lumbar facet joint (FJ) is often associated with pathogenesis in the spine, but quantification of normal FJ motion remains limited to in vitro studies or static imaging of non-functional poses. The purpose of this study was to quantify lumbar FJ kinematics in healthy individuals during functional activity with dynamic stereo radiography (DSX) imaging. Ten asymptomatic participants lifted three known weights starting from a trunk-flexed (∼75°) position to an upright position while being imaged within the DSX system. High resolution computed tomography (CT) scan-derived 3D models of their lumbar vertebrae (L2-S1) were registered to the biplane 2D radiographs using a markerless model-based tracking technique providing instantaneous 3D vertebral kinematics throughout the lifting tasks. Effects of segment level and weight lifted were assessed using mixed-effect repeated measures ANOVA. Superior-inferior (SI) translation dominated FJ translation, with L5S1 showing significantly less translation magnitudes (Median (Md) = 3.5 mm, p < 0.0001) than L2L3, L3L4, and L4L5 segments (Md = 5.9 mm, 6.3 mm and 6.6 mm respectively). Linear regression-based slopes of continuous facet translations revealed strong linearity for SI translation (r...Continue Reading

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Citations

Feb 6, 2019·Computer Methods in Biomechanics and Biomedical Engineering·Emily A BermelArin M Ellingson
May 26, 2020·Journal of Orthopaedic Surgery and Research·Ming YangZhonghai Li
Jun 3, 2021·The Spine Journal : Official Journal of the North American Spine Society·Song KeZhonghai Li

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