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dc.contributor.authorGrassi, Lorenzo
dc.contributor.authorKok, Joeri
dc.contributor.authorGustafsson, Anna
dc.contributor.authorZheng, Yi
dc.contributor.authorVäänänen, Sami P
dc.contributor.authorJurvelin, Jukka S
dc.contributor.authorIsaksson, Hanna
dc.date.accessioned2020-07-01T11:44:11Z
dc.date.available2020-07-01T11:44:11Z
dc.date.issued2020
dc.identifier.urihttps://erepo.uef.fi/handle/123456789/8217
dc.description.abstractAn 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.
dc.language.isoenglanti
dc.publisherElsevier BV
dc.relation.ispartofseriesJournal of biomechanics
dc.relation.urihttp://dx.doi.org/10.1016/j.jbiomech.2020.109826
dc.rightsCC BY-NC-ND https://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectdigital image correlation
dc.subjectfemurs
dc.subjectsideways fall
dc.subjectstrain distribution
dc.subjectdirection of principal strain
dc.subjecthip fractures
dc.subjectmechanical testing
dc.titleElucidating failure mechanisms in human femurs during a fall to the side using bilateral digital image correlation
dc.description.versionfinal draft
dc.contributor.departmentDepartment of Applied Physics, activities
dc.contributor.departmentFaculty of Science and Forestry, shared activities
uef.solecris.id71238094en
dc.type.publicationTieteelliset aikakauslehtiartikkelit
dc.rights.accessrights© 2020 Elsevier Ltd.
dc.relation.doi10.1016/j.jbiomech.2020.109826
dc.description.reviewstatuspeerReviewed
dc.relation.articlenumber109826
dc.relation.issn0021-9290
dc.relation.volume106
dc.rights.accesslevelopenAccess
dc.type.okmA1
uef.solecris.openaccessEi


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