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Vertebral strength prediction under anterior compressive force using a finite element model for osteoporosis assessment

Article dans une revue avec comité de lecture
Author
CHOISNE, Julie
484605 LBM/institute de Biomécanique humaine Georges Charpak
VALIADIS, Jean-Marc
484605 LBM/institute de Biomécanique humaine Georges Charpak
TRAVERT, Christophe
484605 LBM/institute de Biomécanique humaine Georges Charpak
KOLTA, Sami
300123 Hôpital Cochin [AP-HP]
ROUX, Christian
300123 Hôpital Cochin [AP-HP]
ccSKALLI, Wafa
484605 LBM/institute de Biomécanique humaine Georges Charpak

URI
http://hdl.handle.net/10985/18195
DOI
10.1080/10255842.2015.1069562
Date
2015
Journal
Computer Methods in Biomechanics and Biomedical Engineering

Abstract

Vertebral fractures are one of the most common clinical manifestations with the major adverse consequences of osteoporosis as they usually occur under non-traumatic loading conditions. Height loss, back pain and func-tional disability are the most encountered consequences of vertebral fractures with repetitive fracture experience more likely occurring within a year after the first fracture. Early diagnosis of osteoporosis is therefore important for vertebral fracture prevention as drug treatments are more effective before perforation of the trabeculae (Mc Donnell et al. 2007). Bone mineral density (BMD) measured by dual energy X-ray absorptiometry (DXA) is the most clinically used method to diagnose osteopo-rosis. However this technique can only predict 40–70% of vertebral fractures as it only measures areal BMD which does not account for three dimensional (3D) geometry and BMD distribution (Sornay-Rendu et al. 2005). The combination of patient-specific 3D geometry and 3D BMD distribution is necessary to predict vertebral strength. Finite element models (FEM) derived from quantitative computed tomography (qCT) images are used to predict failure strength of vertebral bodies (Crawford et al. 2003; Imai et al. 2006; Buckley et al. 2007). Most of these models were validated under axial compressive forces to the vertebral body while vertebral fractures are more associated with eccentric compres-sion (Lunt et al. 2003). The purpose of this study was to compare the performance of the aBMD from DXA and qCT-based FEM in predicting experimen-tal vertebral strength. The experimental set up allowed for anterior compression testing on isolated vertebral bodies to ensure repeatable loading condition simulat-ing an anterior wedge-shape fracture.

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