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Lower extremity strength and mechanics during jumping in women with patellofemoral pain
John D Willson1, Irene S Davis
1Physical Therapy Program, University of Wisconsin-LaCrosse, LaCrosse WI 54601, USA.
Context:
Lower extremity (LE) weakness might be associated with altered mechanics during weight bearing in subjects with patellofemoral pain syndrome (PFPS).
Objective:
To analyze LE strength, mechanics, and the association between these variables among women with and without PFPS during a simulated athletic task.
Design:
Case control.
Setting:
Motion-analysis laboratory.
Subjects:
20 women with PFPS and 20 healthy women.
Main Outcome Measures:
Peak isometric lateral trunk-flexion, hip-abduction, hip external-rotation, knee-flexion, and knee-extension strength, as well as hip- and knee-joint excursions and angular impulses during single-leg jumps.
Results:
PFPS subjects produced less hip-abduction, hip external-rotation, and trunk lateral-flexion force than the control group. The PFPS group also demonstrated greater hip-adduction excursion and hip-abduction impulses. The association between the strength measurements and LE mechanics was low.
Conclusions:
Women with PFPS demonstrate specific weaknesses and altered LE mechanics. Weakness is not, however, highly correlated with observed differences in mechanics.
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