Torsion of the foot

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dc.contributor.advisorStefanyshyn, Darren
dc.contributor.authorGraf, Eveline Silvia
dc.date.accessioned2017-12-18T22:34:20Z
dc.date.available2017-12-18T22:34:20Z
dc.date.issued2012
dc.descriptionBibliography: p. 163-179en
dc.descriptionSome pages are in colour.en
dc.descriptionIncludes copy of ethics approval. Original copy with original Partial Copyright Licence.en
dc.description.abstractTorsion of the foot reduces the coupling between forefoot and rearfoot motion in the frontal plane. While the amount of torsion occurring in running and cutting has previously been described, the exact location of the rotation axis has not been detennined. It is known that footwear restricts torsional movement; it is unknown what effect footwear torsional stiffoess has on lower extremity joint biomechanics. Therefore, the purposes of this thesis were to 1) develop and assess the repeatability of a method to calculate the location of the torsion axis, 2) describe the torsion axis location during cutting movements, 3) determine the influence of footwear torsional stiffness on torsion angles and lower extremity joint biomechanics during running and cutting movements, and 4) quantify the effect of footwear torsional stiffness on perfom1ance during cutting movements. The torsion axis location was calculated usmg a modified finite helical axis approach, which allowed the calculation of the rotation axis between the forefoot and the rearfoot without the influence of forefoot flexion. The repeatability assessment of the modified finite helical axis approach revealed that the torsion axis location can be calculated repeatable for movements with large torsion angles. For movements with small torsion, however, it cannot be quantified due to the susceptibility of the method for error with small rotations. During the stance phase of cutting movements the torsion axis shifted from an initially medial location within the foot to a lateral location during mid-stance when the torsion angle was large. Towards the end of stance, the axis moved back to the medial side of the foot. The average axis calculated over the entire stance phase was located on the lateral aspect of the midfoot. When wearing torsional stiff shoes, the peak torsion angle was reduced for running, a lateral jab and a shuffle cut when compared to a flexible shoe. Even with a flexible shoe, the peak torsion was reduced compared to barefoot. Stiff shoes led to increased peak ankle inversion angles and peak eversion moments for the shuffle cut. No differences in performance during lateral cutting movements were found between footwear with different torsional stiffness.
dc.format.extentxx, 203 leaves : ill. ; 30 cm.en
dc.identifier.citationGraf, E. S. (2012). Torsion of the foot (Doctoral thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca. doi:10.11575/PRISM/4894en_US
dc.identifier.doihttp://dx.doi.org/10.11575/PRISM/4894
dc.identifier.urihttp://hdl.handle.net/1880/105895
dc.language.isoeng
dc.publisher.facultyKinesiology
dc.publisher.institutionUniversity of Calgaryen
dc.publisher.placeCalgaryen
dc.rightsUniversity of Calgary graduate students retain copyright ownership and moral rights for their thesis. You may use this material in any way that is permitted by the Copyright Act or through licensing that has been assigned to the document. For uses that are not allowable under copyright legislation or licensing, you are required to seek permission.
dc.titleTorsion of the foot
dc.typedoctoral thesis
thesis.degree.grantorUniversity of Calgary
thesis.degree.nameDoctor of Philosophy (PhD)
ucalgary.item.requestcopytrue
ucalgary.thesis.accessionTheses Collection 58.002:Box 2108 627942978
ucalgary.thesis.notesUARCen
ucalgary.thesis.uarcreleaseyen
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