Femur finite element model instantiation from partial anatomies using statistical shape and appearance models
File(s)
Published version
Author(s)
Nolte, Daniel
Bull, Anthony MJ
Type
Journal Article
Abstract
Accurate models of bone shapes are essential for orthopaedic reconstructions. The commonly used methods of using the contralateral side requires an intact bone and anatomical symmetry. Recent studies have shown that statistical shape and appearance models (SSAMs) as an alternative can predict accurate geometric models, but the accuracy of the mechanical property prediction is typically not addressed. This study compares stress and strain differences under identical loading conditions for reconstructions from partial anatomies.
SSAMs representing shape and grey values were created using 40 female cadaveric X-ray computed tomography scans. Finite element models were created for shape reconstructions from partial bone of various lengths with boundary conditions obtained from musculoskeletal simulations. Commonly used anatomical measures, measures of the surface deviations and maximal stresses and strains were used to compare the reconstruction accuracy to the contralateral side.
Surface errors were smaller compared to the contralateral side for reconstructions with 90% of the bone and slightly bigger when less bone was available. Anatomical measures were comparable. The contralateral side showed slightly smaller relative errors for strains of up to 6% on average.
This study has shown that SSAM reconstructions using partial bone geometry are a possible alternative to the contralateral side.
SSAMs representing shape and grey values were created using 40 female cadaveric X-ray computed tomography scans. Finite element models were created for shape reconstructions from partial bone of various lengths with boundary conditions obtained from musculoskeletal simulations. Commonly used anatomical measures, measures of the surface deviations and maximal stresses and strains were used to compare the reconstruction accuracy to the contralateral side.
Surface errors were smaller compared to the contralateral side for reconstructions with 90% of the bone and slightly bigger when less bone was available. Anatomical measures were comparable. The contralateral side showed slightly smaller relative errors for strains of up to 6% on average.
This study has shown that SSAM reconstructions using partial bone geometry are a possible alternative to the contralateral side.
Date Issued
2019-05-01
Date Acceptance
2019-03-10
Citation
Medical Engineering and Physics, 2019, 67, pp.55-65
ISSN
1350-4533
Publisher
Elsevier
Start Page
55
End Page
65
Journal / Book Title
Medical Engineering and Physics
Volume
67
Copyright Statement
This paper is embargoed until 12 months after publication.
© 2019 The Authors. Published by Elsevier Ltd on behalf of IPEM.ThisisanopenaccessarticleundertheCCBYlicense.(http://creativecommons.org/licenses/by/4.0/)
Sponsor
Engineering and Physical Sciences Research Council
National Institute for Health Research
Engineering & Physical Science Research Council (EPSRC)
Grant Number
GHR Project: 16/137/45
EP/R014248/1
Subjects
Anatomical measures
Musculoskeletal simulation
Orthopaedic reconstruction
Subject-specific modelling
Adult
Biomechanical Phenomena
Female
Femur
Finite Element Analysis
Humans
Middle Aged
Models, Anatomic
Risk
Stress, Mechanical
Tomography, X-Ray Computed
Femur
Humans
Tomography, X-Ray Computed
Risk
Finite Element Analysis
Stress, Mechanical
Models, Anatomic
Adult
Middle Aged
Female
Biomechanical Phenomena
Biomedical Engineering
02 Physical Sciences
09 Engineering
11 Medical and Health Sciences
Publication Status
Published
Date Publish Online
2019-03-20