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Accuracy of finite element predictions in sideways load configurations for the proximal human femur

Grassi, Lorenzo LU ; Schileo, Enrico; Taddei, Fulvia; Zani, Lorenzo; Juszczyk, Mateusz; Cristofolini, Luca and Viceconti, Marco (2012) In Journal of Biomechanics 45(2). p.394-399
Abstract (Swedish)
Abstract in Undetermined

Subject-specific finite element models have been used to predict stress-state and fracture risk in individual patients. While many studies analysed quasi-axial loading configurations, only few works simulated sideways load configurations, such as those arising in a fall. The majority among these latter directly predicted bone strength, without assessing elastic strain prediction accuracy. The aim of the present work was to evaluate if a subject-specific finite element modelling technique from CT data that accurately predicted strains in quasi-axial loading configurations is suitable to accurately predict strains also when applying low magnitude loads in sideways configurations. To this aim, a... (More)
Abstract in Undetermined

Subject-specific finite element models have been used to predict stress-state and fracture risk in individual patients. While many studies analysed quasi-axial loading configurations, only few works simulated sideways load configurations, such as those arising in a fall. The majority among these latter directly predicted bone strength, without assessing elastic strain prediction accuracy. The aim of the present work was to evaluate if a subject-specific finite element modelling technique from CT data that accurately predicted strains in quasi-axial loading configurations is suitable to accurately predict strains also when applying low magnitude loads in sideways configurations. To this aim, a combined numerical–experimental study was performed to compare finite element predicted strains with strain-gauge measurements from three cadaver proximal femurs instrumented with sixteen strain rosettes and tested non-destructively under twelve loading configurations, spanning a wide cone (0–30° for both adduction and internal rotation angles) of sideways fall scenarios. The results of the present study evidenced a satisfactory agreement between experimentally measured and predicted strains (R2 greater than 0.9, RMSE% lower than 10%) and displacements. The achieved strain prediction accuracy is comparable to those obtained in state of the art studies in quasi-axial loading configurations. Still, the presence of the highest strain prediction errors (around 30%) in the lateral neck aspect would deserve attention in future studies targeting bone failure. (Less)
Please use this url to cite or link to this publication:
author
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Finite element, Sideways fall, Human femur, Experimental validation
in
Journal of Biomechanics
volume
45
issue
2
pages
394 - 399
publisher
Elsevier
external identifiers
  • Scopus:84455208194
ISSN
1873-2380
language
English
LU publication?
no
id
fdbc63c7-ec45-4dd3-b456-d7b6fcea3839 (old id 2298311)
alternative location
http://www.sciencedirect.com/science/article/pii/S0021929011006531
date added to LUP
2012-01-20 13:00:48
date last changed
2016-12-04 04:44:08
@misc{fdbc63c7-ec45-4dd3-b456-d7b6fcea3839,
  abstract     = {<b>Abstract in Undetermined</b><br/><br>
Subject-specific finite element models have been used to predict stress-state and fracture risk in individual patients. While many studies analysed quasi-axial loading configurations, only few works simulated sideways load configurations, such as those arising in a fall. The majority among these latter directly predicted bone strength, without assessing elastic strain prediction accuracy. The aim of the present work was to evaluate if a subject-specific finite element modelling technique from CT data that accurately predicted strains in quasi-axial loading configurations is suitable to accurately predict strains also when applying low magnitude loads in sideways configurations. To this aim, a combined numerical–experimental study was performed to compare finite element predicted strains with strain-gauge measurements from three cadaver proximal femurs instrumented with sixteen strain rosettes and tested non-destructively under twelve loading configurations, spanning a wide cone (0–30° for both adduction and internal rotation angles) of sideways fall scenarios. The results of the present study evidenced a satisfactory agreement between experimentally measured and predicted strains (R2 greater than 0.9, RMSE% lower than 10%) and displacements. The achieved strain prediction accuracy is comparable to those obtained in state of the art studies in quasi-axial loading configurations. Still, the presence of the highest strain prediction errors (around 30%) in the lateral neck aspect would deserve attention in future studies targeting bone failure.},
  author       = {Grassi, Lorenzo and Schileo, Enrico and Taddei, Fulvia and Zani, Lorenzo and Juszczyk, Mateusz and Cristofolini, Luca and Viceconti, Marco},
  issn         = {1873-2380},
  keyword      = {Finite element,Sideways fall,Human femur,Experimental validation},
  language     = {eng},
  number       = {2},
  pages        = {394--399},
  publisher    = {ARRAY(0x99563c0)},
  series       = {Journal of Biomechanics},
  title        = {Accuracy of finite element predictions in sideways load configurations for the proximal human femur},
  volume       = {45},
  year         = {2012},
}