John D Willson1, Irene S Davis. 1. Physical Therapy Program, University of Wisconsin-LaCrosse, LaCrosse WI 54601, USA.
Abstract
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.
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.
Authors: Isaac Wouters; Thomas Almonroeder; Bryan Dejarlais; Andrew Laack; John D Willson; Thomas W Kernozek Journal: Int J Sports Phys Ther Date: 2012-12
Authors: Daniel K Schneider; Brian Grawe; Robert A Magnussen; Adrick Ceasar; Shital N Parikh; Eric J Wall; Angelo J Colosimo; Christopher C Kaeding; Gregory D Myer Journal: Am J Sports Med Date: 2016-02-12 Impact factor: 6.202