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ISSLS PRIZE IN BIOENGINEERING SCIENCE 2018: dynamic imaging of degenerative spondylolisthesis reveals mid-range dynamic lumbar instability not evident on static scientific radiographs.
Eur Backbone J. 2018 Feb 22;:
Authors: Dombrowski ME, Rynearson B, LeVasseur C, Adgate Z, Donaldson WF, Lee JY, Aiyangar A, Anderst WJ
Summary
PURPOSE: Degenerative spondylolisthesis (DS) within the setting of symptomatic lumbar spinal stenosis is usually handled with spinal fusion along with decompression with laminectomy. Nonetheless, current research have proven comparable scientific outcomes after decompression alone, suggesting subset of DS sufferers might not require spinal fusion. Identification of dynamic instability may show helpful for predicting which sufferers are at greater threat of post-laminectomy destabilization necessitating fusion. The aim of this research was to find out if static scientific radiographs adequately characterize dynamic instability in sufferers with lumbar degenerative spondylolisthesis (DS) and to match the rotational and translational kinematics in vivo throughout steady dynamic flexion exercise in DS versus asymptomatic age-matched controls.
METHODS: Seven sufferers with symptomatic single stage lumbar DS (6 M, 1 F; 66 ± 5.zero years) and 7 age-matched asymptomatic controls (5 M, 2 F age 63.9 ± 6.four years) underwent biplane radiographic imaging throughout steady torso flexion. A volumetric model-based monitoring system was used to trace every vertebra within the radiographic photos utilizing subject-specific 3D bone fashions from high-resolution computed tomography (CT). In vivo steady dynamic sagittal rotation (flexion/extension) and AP translation (slip) have been calculated and in comparison with scientific measures of intervertebral flexion/extension and AP translation obtained from normal lateral flexion/extension radiographs.
RESULTS: Static scientific radiographs underestimate the diploma of AP translation seen on dynamic in vivo imaging (1.zero vs three.1 mm; p = zero.03). DS sufferers demonstrated three main movement patterns in comparison with a single kinematic sample in asymptomatic controls when analyzing steady dynamic in vivo imaging. three/7 (42%) of sufferers with DS demonstrated aberrant mid-range movement.
CONCLUSION: Steady in vivo dynamic imaging in DS reveals a spectrum of aberrant movement with considerably better kinematic heterogeneity than beforehand realized that isn’t readily seen on present scientific imaging.
LEVEL OF EVIDENCE: Degree V information These slides could be retrieved underneath Digital Supplementary Materials.
PMID: 29470715 [PubMed – as supplied by publisher]