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THE INFLUENCE OF PATELLOFEMORAL JOINT
LOADING ON PATELLA STRAIN AND PATELLA
WATER CONTENT IN FEMALES WITH
PATELLOFEMORAL PAIN
by
Kai-Yu Ho
A Dissertation Presented to the
FACULTY OF THE USC GRADUATE SCHOOL
UNIVERSITY OF SOUTHERN CALIFORNIA
In Partial Fulfillment of the
Requirements for the Degree
DOCTOR OF PHILOSOPHY
(BIOKINESIOLOGY)
December 2012
Copyright 2012 Kai-Yu Ho
Object Description
| Title | The influence of patellofemoral joint loading on patella strain and patella water content in females with patellofemoral pain |
| Author | Ho, Kai-Yu |
| Author email | kaiyuho@usc.edu;kaiyuho@usc.edu |
| Degree | Doctor of Philosophy |
| Document type | Dissertation |
| Degree program | Biokinesiology |
| School | School of Dentistry |
| Date defended/completed | 2012-10-19 |
| Date submitted | 2012-11-21 |
| Date approved | 2012-11-21 |
| Restricted until | 2012-11-21 |
| Date published | 2012-11-21 |
| Advisor (committee chair) | Powers, Christopher M. |
| Advisor (committee member) |
Colletti, Patrick M. Hu, Houchun H. Keyak, Joyce H. Salem, George |
| Abstract | Recent research has suggested that patellofemoral pain (PFP) may be the result of elevated loading of highly-innervated subchondral bone during weight-bearing activities. Furthermore, excessive bone strain level resulting from elevated patellofemoral joint stress is believed to cause bone injury, increased bone water content, and patellofemoral symptoms. The purpose of this dissertation was to study potential mechanism(s) of PFP by exploring the influence of patellofemoral joint loading on pain, patella bone strain, and patella water content. To accomplish this objective, 3 studies were undertaken. ❧ The purpose of Chapter III was to determine whether individuals with PFP exhibit elevated patella bone strain magnitudes when compared to pain-free controls. The secondary objective was to determine the influence of patella cartilage thickness on patella strain magnitude. Findings revealed that individuals with PFP demonstrated increased magnitudes of peak and average minimum and maximum principal strain values within the patella. Additionally, decreasing cartilage thickness was associated with higher levels of peak minimum principal strain and peak maximum principal strain. ❧ The purpose of Chapter IV was to compare patella water content between female runners with and without PFP using chemical-shift-encoded water-fat magnetic resonance imaging (MRI). Results indicated that subjects with PFP demonstrated significantly greater total patella water content when compared to pain-free controls. ❧ The purpose of Chapter V was to quantify changes in pain and patella water content following an acute bout of loading in female runners with PFP. Findings revealed that persons with PFP demonstrated significant increases in pain and patella water content immediately following a running protocol. Pain and patella water content decreased to pre-running levels following 48 hours of rest. ❧ The primary finding of this dissertation was that PFP was associated with increases in patella bone strain magnitude and patella water content. The higher resting patella water content observed in female runners with PFP is suggestive of venous engorgement and elevated extracellular fluid due to chronic overloading. Additionally, transient changes in patella water content associated with repetitive impact loading (i.e., running) may contribute to patellofemoral symptoms. |
| Keyword | bone strain; bone water content; cartilage thickness; patella; patellofemoral pain |
| Language | English |
| Part of collection | University of Southern California dissertations and theses |
| Publisher (of the original version) | University of Southern California |
| Place of publication (of the original version) | Los Angeles, California |
| Publisher (of the digital version) | University of Southern California. Libraries |
| Provenance | Electronically uploaded by the author |
| Type | texts |
| Legacy record ID | usctheses-m |
| Rights | Ho, Kai-Yu |
| Access conditions | The author retains rights to his/her dissertation, thesis or other graduate work according to U.S. copyright law. Electronic access is being provided by the USC Libraries in agreement with the author, as the original true and official version of the work, but does not grant the reader permission to use the work if the desired use is covered by copyright. It is the author, as rights holder, who must provide use permission if such use is covered by copyright. The original signature page accompanying the original submission of the work to the USC Libraries is retained by the USC Libraries and a copy of it may be obtained by authorized requesters contacting the repository e-mail address given. |
| Repository name | University of Southern California Digital Library |
| Repository address | USC Digital Library, University of Southern California, University Park Campus MC 7002, 106 University Village, Los Angeles, California 90089-7002, USA |
| Repository email | cisadmin@usc.edu |
| Archival file | uscthesesreloadpub_Volume6/etd-HoKaiYu-1330.pdf |
Description
| Title | Page 1 |
| Full text | THE INFLUENCE OF PATELLOFEMORAL JOINT LOADING ON PATELLA STRAIN AND PATELLA WATER CONTENT IN FEMALES WITH PATELLOFEMORAL PAIN by Kai-Yu Ho A Dissertation Presented to the FACULTY OF THE USC GRADUATE SCHOOL UNIVERSITY OF SOUTHERN CALIFORNIA In Partial Fulfillment of the Requirements for the Degree DOCTOR OF PHILOSOPHY (BIOKINESIOLOGY) December 2012 Copyright 2012 Kai-Yu Ho |
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