Analysis of Center of Mass and Gravity-Induced Vertebral Axial Torque on the Scoliotic Spine by Barycentremetry release_myxdrqmoevcztimgnhymppux7m

by Thomas Thenard, Claudio Vergari, Thibault Hernandez, Raphael Vialle, Wafa Skalli

Published in Spine Deformity by Elsevier BV.

2019   Volume 7, Issue 4, p525-532

Abstract

Retrospective observational study. To determine the mass distribution along the scoliotic trunk using barycentremetry and its relationship with vertebral axial rotation and torque. Deformity progression in adolescent idiopathic scoliosis (AIS) is not yet fully understood, but gravity load on the spine could play a role. Barycentremetry allows to characterize body mass distribution in standing position, which could provide a better understanding the mechanisms of progression. 81 subjects (27 healthy adolescents and 53 AIS patients) underwent biplanar radiography and 3D reconstruction of the spine and body envelope. Position of the gravity line was estimated, as well as trunk segmental centers of mass COMs at each vertebral level and resulting axial torques to each vertebra. The COM of all trunk segments was less than 1 cm from the gravity line in the frontal plane for healthy subjects, and less than 1.5 cm for AIS patients. Vertebral axial torque was 0.7 ± 0.5 Nm in healthy subjects, 2.9 ± 2.1 Nm at the junctional vertebrae of AIS patients and 0.5 ± 0.5 at the apex. A strong association was found between high torque and high intervertebral rotation at junctions, with low torque and low intervertebral axial rotation at the apex. Results suggest that AIS patients can maintain the COM of each body segment close to their gravity line, irrespective of the severity and asymmetry of their deformity. Moreover, torque analysis shed some light on the importance of junctional vertebrae in the spinal deformity and, potentially, in the vicious cycle determining scoliosis progression. Level III.
In text/plain format

Archived Files and Locations

application/pdf  2.2 MB
file_gt5io65aojbq3c7i3ttily3n3e
hal.archives-ouvertes.fr (web)
web.archive.org (webarchive)
application/pdf  2.2 MB
file_7vmynurpcnc7xif2ttngogwn7m
sam.ensam.eu (web)
web.archive.org (webarchive)
Read Archived PDF
Preserved and Accessible
Type  article-journal
Stage   published
Date   2019-12-30
Language   en ?
Container Metadata
Not in DOAJ
In Keepers Registry
ISSN-L:  2212-134X
Work Entity
access all versions, variants, and formats of this works (eg, pre-prints)
Catalog Record
Revision: f9b1d4bf-3714-448c-9efb-882d1dccfc62
API URL: JSON