<i>In Vivo</i> Strains in the Femur of the Nine-Banded Armadillo (<i>Dasypus novemcinctus</i>)

<i>In Vivo</i> Strains in the Femur of the Nine-Banded Armadillo (<i>Dasypus novemcinctus</i>)

Bibliographic Details
Main Author: Copploe, Joseph V., II
Language:English
Published: Youngstown State University / OhioLINK 2014
Subjects:
Biomechanics
Bone
Bending
Torsion
Safety factor
Locomotion
Mammal
Stress
Online Access:http://rave.ohiolink.edu/etdc/view?acc_num=ysu1403533523
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spelling ndltd-OhioLink-oai-etd.ohiolink.edu-ysu14035335232021-08-03T06:25:31Z <i>In Vivo</i> Strains in the Femur of the Nine-Banded Armadillo (<i>Dasypus novemcinctus</i>) Copploe, Joseph V., II Biomechanics Bone Bending Torsion Safety factor Locomotion Mammal Stress Understanding of the interplay between bone loading patterns and bone material properties in mammals has been based primarily on evidence from upright eutherians, which show limb bones that are loaded predominantly in anteroposterior (AP) bending with minimal torsion. However, loading patterns from the femora of marsupial opossums using crouched limb posture, show appreciable torsion while the bone experiences mediolateral (ML) bending. These data indicated greater locomotor loading diversity than was previously recognized, and suggested the possibility that ancestral loading patterns found in sprawling reptiles might have been retained among basal mammals. To further test this hypothesis, <i>in vivo</i> locomotor strains were recorded from the femur of the nine-banded armadillo (<i>Dasypus novemcinctus</i>). Orientations of principal strains and magnitudes of shear strains indicate that their femora are exposed to a limited amount of torsion, while loading is dominated by ML bending that places the medial aspect of the femur in compression and the lateral aspect in tension. This orientation of bending is similar to that found in opossums, but planar strain analyses indicate much more of the armadillo femur experiences tension during bending, potentially due to the actions of large muscles attached to the robust third trochanter (T3). Comparisons of peak locomotor loads to evaluations of femoral mechanical properties lead to estimates of limb bone safety factors between 2.3--5.0 in bending, similar to other eutherians, but lower than opossums and most sprawling taxa. Thus, femoral loading patterns in armadillos show a mixture of similarities to both opossums (ML bending) and eutherians (limited torsion and low safety factors), along with unique features (high axial tension) that likely relate to their distinctive hindlimb anatomy. 2014-06-24 English text Youngstown State University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=ysu1403533523 http://rave.ohiolink.edu/etdc/view?acc_num=ysu1403533523 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.
collection NDLTD
language English
sources NDLTD
topic Biomechanics
Bone
Bending
Torsion
Safety factor
Locomotion
Mammal
Stress
spellingShingle Biomechanics
Bone
Bending
Torsion
Safety factor
Locomotion
Mammal
Stress
Copploe, Joseph V., II
<i>In Vivo</i> Strains in the Femur of the Nine-Banded Armadillo (<i>Dasypus novemcinctus</i>)
author Copploe, Joseph V., II
author_facet Copploe, Joseph V., II
author_sort Copploe, Joseph V., II
title <i>In Vivo</i> Strains in the Femur of the Nine-Banded Armadillo (<i>Dasypus novemcinctus</i>)
title_short <i>In Vivo</i> Strains in the Femur of the Nine-Banded Armadillo (<i>Dasypus novemcinctus</i>)
title_full <i>In Vivo</i> Strains in the Femur of the Nine-Banded Armadillo (<i>Dasypus novemcinctus</i>)
title_fullStr <i>In Vivo</i> Strains in the Femur of the Nine-Banded Armadillo (<i>Dasypus novemcinctus</i>)
title_full_unstemmed <i>In Vivo</i> Strains in the Femur of the Nine-Banded Armadillo (<i>Dasypus novemcinctus</i>)
title_sort <i>in vivo</i> strains in the femur of the nine-banded armadillo (<i>dasypus novemcinctus</i>)
publisher Youngstown State University / OhioLINK
publishDate 2014
url http://rave.ohiolink.edu/etdc/view?acc_num=ysu1403533523
work_keys_str_mv AT copploejosephvii iinvivoistrainsinthefemuroftheninebandedarmadilloidasypusnovemcinctusi
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