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Measurement of three-dimensional scapular kinematics Choo, Anthony Min Te
Abstract
It has been well recognized that the scapula and the humerus work in concert to enable the shoulder joint to achieve its high mobility in three-dimensions. Pathologies such as impingement and instability are focused at the glenohumeral junction between the two bones. Other authors have attempted to measure scapulothoracic and scapulohumeral rhythms as a means of better understanding the shoulder joint. However, at present, the inability to practically measure scapular kinematics in a clinical setting constitutes a significant problem in the rehabilitation of shoulder pathologies. This thesis addresses the issue of measuring three-dimensional scapular kinematics non-invasively. A novel method using a grid of skin surface markers was developed. The method was found to show promising results in a pilot study and a pre-clinical test on a cadaver. An accuracy of better than 5° was achieved for all three cardan angles used to describe changes in scapular attitudes. The method quantified the regional variations encountered with surface markers and identified the optimal regions for measurement. Additionally, a prototype method utilizing two-dimensional Fourier analysis was investigated to measure scapular upward rotation through image analysis of surface features. The results were not conclusive but merit further investigation. The gold standard used to assess accuracy of the non-invasive method was roentgen stereophotogrammetric analysis (RSA). The accuracy of the RSA system was investigated with computer simulations and benchtop analyses. System accuracy ranged from 0.21-mm to 0.67-mm for reconstruction of marker coordinates, from 0.23- mm to 0.86-mm for translation, and from 0.19° to 1.05° for rotations. The stereophotogrammetric calibration method was an important factor in the resultant accuracy. The accuracy was also affected by the reconstruction algorithm used. Direct Linear Transformation (DLT) was found more favorable than traditional RSA methods described by Selvik. Finally, low x-ray scanning resolution (150-ppi) was a principal hardware limitation contributing to lower accuracy. This thesis has demonstrated a scapular measurement technique and presented some novel ideas that should contribute to the long-term development of a clinically practical, non-invasive, accurate method for measuring human scapular kinematics.
Item Metadata
Title |
Measurement of three-dimensional scapular kinematics
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
2001
|
Description |
It has been well recognized that the scapula and the humerus work in concert to enable
the shoulder joint to achieve its high mobility in three-dimensions. Pathologies such as
impingement and instability are focused at the glenohumeral junction between the two
bones. Other authors have attempted to measure scapulothoracic and scapulohumeral
rhythms as a means of better understanding the shoulder joint. However, at present, the
inability to practically measure scapular kinematics in a clinical setting constitutes a
significant problem in the rehabilitation of shoulder pathologies.
This thesis addresses the issue of measuring three-dimensional scapular kinematics
non-invasively. A novel method using a grid of skin surface markers was developed.
The method was found to show promising results in a pilot study and a pre-clinical test
on a cadaver. An accuracy of better than 5° was achieved for all three cardan angles
used to describe changes in scapular attitudes. The method quantified the regional
variations encountered with surface markers and identified the optimal regions for
measurement. Additionally, a prototype method utilizing two-dimensional Fourier
analysis was investigated to measure scapular upward rotation through image analysis
of surface features. The results were not conclusive but merit further investigation.
The gold standard used to assess accuracy of the non-invasive method was roentgen
stereophotogrammetric analysis (RSA). The accuracy of the RSA system was
investigated with computer simulations and benchtop analyses. System accuracy
ranged from 0.21-mm to 0.67-mm for reconstruction of marker coordinates, from 0.23-
mm to 0.86-mm for translation, and from 0.19° to 1.05° for rotations. The
stereophotogrammetric calibration method was an important factor in the resultant
accuracy. The accuracy was also affected by the reconstruction algorithm used. Direct
Linear Transformation (DLT) was found more favorable than traditional RSA methods
described by Selvik. Finally, low x-ray scanning resolution (150-ppi) was a principal
hardware limitation contributing to lower accuracy.
This thesis has demonstrated a scapular measurement technique and presented some
novel ideas that should contribute to the long-term development of a clinically
practical, non-invasive, accurate method for measuring human scapular kinematics.
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Extent |
26666984 bytes
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Genre | |
Type | |
File Format |
application/pdf
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Language |
eng
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Date Available |
2009-07-29
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0080878
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
2001-05
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.