Ellipse Fitting for Planar Hip Morphology and Kinematics
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Authors
Desroche, Chloe
Date
Type
thesis
Language
eng
Keyword
hip , ellipse , morphology , kinematics
Alternative Title
Abstract
Although the human hip is commonly thought to be a ball-and-socket
joint, recent 3D studies suggest that the hip translates as well as
rotates. This is of interest not only for biomechanics but also
clinically, because hip translation may be important to physiotherapy
and to computer-assisted surgery for total hip replacement. Previous
3D studies have evaluated hip kinematics as well as morphology by CT,
MRI and surgical intervention. A minimally invasive, inexpensive, and
accurate way of measuring hip shape and motion may be useful in basic
science and clinical application. This work used prototype software
to quantify planar hip morphology and kinematics from plain 2D
radiographs.
Ellipses were fit to the articular contours of the femoral head and
acetabulum of plain 2D radiographs of arthritic and dysplastic
patients. The prototype software was validated in a study performed
by three board-certified orthopedic surgeons. It was found to be
efficient and reliable, taking less than one minute to quantify planar
hip morphology and having no statistical difference between the
observers.
The prototype software was used in a clinical study to quantify planar
hip kinematics. Preoperative AP pelvic radiographs were taken of 11
THA patients in 4 different positions. The semi-automated fits
detected a mean femoral head translation of 3.42mm, with no
discernible directional pattern. Every one of these arthritic
patients exhibited substantial planar hip translation.
The findings are consistent with the hypothesis that hip morphology
and kinematics can be quantified from plain 2D radiographs.
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Copying and Preserving Your Thesis
This publication is made available by the authority of the copyright owner solely for the purpose of private study and research and may not be copied or reproduced except as permitted by the copyright laws without written authority from the copyright owner.
ProQuest PhD and Master's Theses International Dissemination Agreement
Intellectual Property Guidelines at Queen's University
Copying and Preserving Your Thesis
This publication is made available by the authority of the copyright owner solely for the purpose of private study and research and may not be copied or reproduced except as permitted by the copyright laws without written authority from the copyright owner.