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The effects of deep leg squats on patellofemoral pain syndrome - a single subject design study Open Access


Other title
patellofemoral pain, squats, treatment, exercise, knee pain, physical therapy
Type of item
Degree grantor
University of Alberta
Author or creator
Costa, Larissa A
Supervisor and department
Dr. David Magee (Physical Therapy)
Examining committee member and department
Dr. Sharon Warren (Rehabilitation Medicine)
Dr. Dan Syrotuik (Physical Education and Recreation)
Dr. Douglas Gross (Physical Therapy)
Faculty of Rehabilitation Medicine

Date accepted
Graduation date
Masters of Science
Degree level
Patellofemoral Pain Syndrome (PFPS) is a common knee disorder. Its etiology is not clear and appears to be multifactorial. There are several options of treatment; however none uses total knee flexion since it is thought to increase symptoms. This study was an exploratory multiple baseline-Single Subject Design that used an innovative protocol of deep squats on 11 subjects with PFPS. The objectives were to evaluate: 1) the protocol as treatment for PFPS and its feasibility and 2) how pain and function changed over time. Pain and function changed over the first half of the protocol. All subjects were compliers (20 or more days of squats), but the amount of performance varied. Eight subjects (72.7%) had a clinically relevant pain reduction, 6 performed ≥ 80% however, 2 performed ≤ 32% of the protocol. Overall, deep squats appear to be a promising and feasible intervention for PSPS, however more studies are necessary.
License granted by Larissa Costa ( on 2011-09-26T16:58:38Z (GMT): Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of the above terms. The author reserves all other publication and other rights in association with the copyright in the thesis, and except as herein provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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