Posterolateral hip muscle strengthening versus quadriceps strengthening for patellofemoral pain: a comparative control trial.
OBJECTIVE
To compare the efficacy of posterolateral hip muscle strengthening versus quadriceps strengthening in reducing pain and improving health status in persons with patellofemoral pain (PFP).


METHODS
Comparative control trial.


METHODS
Rehabilitation facility.


METHODS
Persons with a diagnosis of PFP (N=36; 18 men, 18 women).


METHODS
Patients were alternately assigned to a posterolateral hip muscle strengthening group (9 men and 9 women) or a quadriceps strengthening group (9 men and 9 women). The posterolateral hip muscle strengthening group performed hip abductor and external rotator strengthening exercises, whereas the quadriceps strengthening group performed quadriceps strengthening exercises (3 times a week for 8wk).


METHODS
Pain (visual analog scale [VAS]) and health status (Western Ontario McMaster Universities Osteoarthritis Index [WOMAC]) were assessed at baseline, postintervention, and 6-month follow-up.


RESULTS
Significant improvements in VAS and WOMAC scores were observed in both groups from baseline to postintervention and baseline to 6-month follow-up (P<.001). Improvements in VAS and WOMAC scores in the posterolateral hip exercise group were superior to those in the quadriceps exercise group postintervention and at 6-month follow-up (P<.05).


CONCLUSIONS
Although both intervention programs resulted in decreased pain and improved function in persons with PFP, outcomes in the posterolateral hip exercise group were superior to the quadriceps exercise group. The superior outcomes obtained in the posterolateral hip exercise group were maintained 6 months postintervention.
College of Sport Sciences, University of Isfahan, Isfahan, Iran.
Khalil
K
Khayambashi
College of Sport Sciences, University of Isfahan, Isfahan, Iran.
Alireza
A
Fallah
College of Sport Sciences, University of Isfahan, Isfahan, Iran.
Ahmadreza
A
Movahedi
Jacquelin Perry Musculoskeletal Biomechanics Research Laboratory, Division of Biokinesiology and Physical Therapy, University of Southern California, Los Angeles, CA.
Jennifer
J
Bagwell
Jacquelin Perry Musculoskeletal Biomechanics Research Laboratory, Division of Biokinesiology and Physical Therapy, University of Southern California, Los Angeles, CA. Electronic address: powers@usc.edu.
Christopher
C
Powers
D000328:Adult; D005080:Exercise Test; D005081:Exercise Therapy / Q000379:methods*; D005260:Female; D005500:Follow-Up Studies; D006615:Hip / Q000503:physiopathology*; D006801:Humans; D008297:Male; D053580:Muscle Strength / Q000502:physiology*; D010147:Pain Measurement / Q000379:methods*; D046788:Patellofemoral Pain Syndrome / Q000503:physiopathology / Q000534:rehabilitation*; D052097:Quadriceps Muscle / Q000503:physiopathology*
Clinical trial [publication type]; Patella; Patellofemoral pain syndrome; Rehabilitation