Skip to main contentSkip to search and navigation

UEF eREPOSITORY

    • English
    • suomi
  • English 
    • English
    • suomi
  • Login
View Item 
  •   Home
  • Artikkelit
  • Luonnontieteiden ja metsätieteiden tiedekunta
  • View Item
  •   Home
  • Artikkelit
  • Luonnontieteiden ja metsätieteiden tiedekunta
  • View Item
JavaScript is disabled for your browser. Some features of this site may not work without it.

Elucidating failure mechanisms in human femurs during a fall to the side using bilateral digital image correlation

Thumbnail
Files
Item embargoed until 2021-06-09. Restrictions imposed by the publisher
Self archived version
final draft
Date
2020
Author(s)
Grassi, Lorenzo
Kok, Joeri
Gustafsson, Anna
Zheng, Yi
Väänänen, Sami P
Jurvelin, Jukka S
Isaksson, Hanna
Unique identifier
10.1016/j.jbiomech.2020.109826
Metadata
Show full item record
More information
Research Database SoleCris

Self-archived article

Citation
Grassi, Lorenzo. Kok, Joeri. Gustafsson, Anna. Zheng, Yi. Väänänen, Sami P. Jurvelin, Jukka S. Isaksson, Hanna. (2020). Elucidating failure mechanisms in human femurs during a fall to the side using bilateral digital image correlation.  Journal of biomechanics, 106, 109826. 10.1016/j.jbiomech.2020.109826.
Rights
© 2020 Elsevier Ltd.
Licensed under
CC BY-NC-ND https://creativecommons.org/licenses/by-nc-nd/4.0/
Abstract

An improved understanding of the mechanical properties of human femurs is a milestone towards a more accurate assessment of fracture risk. Digital image correlation (DIC) has recently been adopted to provide full-field strain measurements during mechanical testing of femurs. However, it has typically been used to measure strains on the anterior side of the femur, whereas in both single-leg-stance and sideways fall loading conditions, the highest deformations result on the medial and lateral sides of the femoral neck. The goal of this study was to measure full-field deformations simultaneously on the medial and lateral side of the femoral neck in a configuration resembling a fall to the side. Twelve female cadaver femurs were prepared for DIC measurements and tested in sideways fall at 5 mm/s displacement rate. Two pairs of cameras recorded the medial and lateral side of the femoral neck, and deformations were calculated using DIC. The samples exhibited a two-stage failure: first, a compressive collapse on the superolateral side of the femoral neck in conjunction with peak force, followed by complete femoral neck fracture at the force drop following the post-elastic phase. DIC measurements corroborated this observation by reporting no tensile strains above yield limit for the medial side of the neck up to peak force. DIC measurements registered onto the bone micro-architecture showed strain localizations in proximity of cortical pores due to, for instance, blood vessels. This could explain previously reported discrepancies between simulations and experiments in regions rich with large pores, like the superolateral femoral neck.

Subjects
digital image correlation   femurs   sideways fall   strain distribution   direction of principal strain   hip fractures   mechanical testing   
URI
https://erepo.uef.fi/handle/123456789/8217
Link to the original item
http://dx.doi.org/10.1016/j.jbiomech.2020.109826
Publisher
Elsevier BV
Collections
  • Luonnontieteiden ja metsätieteiden tiedekunta [1109]
University of Eastern Finland
OpenAccess
eRepo
erepo@uef.fi
OpenUEF
Service provided by
the University of Eastern Finland Library
Library web pages
Twitter
Facebook
Youtube
Library blog
 sitemap
Search

Browse

All of the ArchiveResource types & CollectionsBy Issue DateAuthorsTitlesSubjectsFacultyDepartmentFull organizationSeriesMain subjectThis CollectionBy Issue DateAuthorsTitlesSubjectsFacultyDepartmentFull organizationSeriesMain subject

My Account

Login
University of Eastern Finland
OpenAccess
eRepo
erepo@uef.fi
OpenUEF
Service provided by
the University of Eastern Finland Library
Library web pages
Twitter
Facebook
Youtube
Library blog
 sitemap