The Associations of Hip Strength, Lower Extremity Kinematics and Functional Activity among Female Adults With and Without Patellofemoral Pain Syndrome
Date Issued
2009
Date
2009
Author(s)
Hsu, Chih-Chung
Abstract
Backgroundatellofemoral pain is a common knee disorder. Conservative treatment could decrease pain and improve function efficiently. However, none of them could totally cure patients. The researcher focus then shift toward the hip joint from patellofemoral joint. Evidence showed decreased hip abductor and external rotator strength existed in patients with patellofemoral pain, however, we have no idea if the deficit of hip muscle strength would influence the lower-extremity kinematics and result in pain. Furthermore, there is no study focus on the relationship between hip muscle strength and kinematics, and the functional activity.The purpose of this study was to investigate the association of hip strength, lower extremity kinematics, and the functional activity among female with and without patellofemoral pain.urpose o compare the hip strength (hip abductor, external rotator, and extensor) and lower extremity kinematics (frontal and transverse plane of hip joint) between female with and without patellofemoral pain, and to investigate the relationship between hip strength and lower extremity kinematics to see if these parameters could predict the functional activity. ethodswenty female subjects with patellofemoral pain, and 20 matched healthy controls participated. All subjects underwent muscle strength testing of hip muscles by hand-held dynamometer, and lower extremity kinematics testing during functional ascend and descend stairs by Fastrak. The functional activity was measured by anterior knee pain scale and ascend/descend stairs.esultsemale subjects with patellofemoral pain showed significantly decreased hip external rotator and extensor strength (P< .05), and lower hip abductor strength (P= .06) compared to the matched control group. They also demonstrated more hip adduction and internal rotation during functional ascend and descend stairs (P< .01) compared to the matched control. The functional activity performance was significantly different between patients and controls (P< .01). There was no relationship between hip strength and lower extremity kinematics (P> .05), and between hip strength, lower extremity kinematics, and anterior knee pain scale (P> .05). However, hip extensor strength was significantly associated with functional activity (r= - .34~ - .39, P< .03). The hip adduction angle during up stairs was correlated with ascend stairs performance (r= .53, P< .001), while the hip internal rotation angle during descend stairs was correlated with descend stairs performance (r= .43, P= .005). Multiple regressions showed ascend stairs time= 5.99 – 0.04* hip extensor strength + 0.25* hip adduction angle; descend stairs time= 3.25 – 0.04* hip extensor strength + 0.18* hip internal rotation angle.onclusionoung female subjects with patellofemoral pain demonstrated decreased hip external rotator and extensor strength, and showed greater hip adduction and internal rotation during functional ascend and descend stairs compared to the healthy controls. Hip extensor strength, hip adduction and internal rotation angle were associated with ascend / descend stairs of functional activity.
Subjects
Patellofemoral pain syndrome
Hip muscle
Lower extremity kinematics
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