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J Athl Train. 2011 Mar-Apr;46(2):142-9. doi: 10.4085/1062-6050-46.2.142.

Changes in knee biomechanics after a hip-abductor strengthening protocol for runners with patellofemoral pain syndrome.

Author information

  • 1Faculty of Kinesiology, University of Calgary, AB, Canada. rferber@ucalgary.ca

Abstract

CONTEXT:

Very few authors have investigated the relationship between hip-abductor muscle strength and frontal-plane knee mechanics during running.

OBJECTIVE:

To investigate this relationship using a 3-week hip-abductor muscle-strengthening program to identify changes in strength, pain, and biomechanics in runners with patellofemoral pain syndrome (PFPS).

DESIGN:

Cohort study.

SETTING:

University-based clinical research laboratory.

PATIENTS OR OTHER PARTICIPANTS:

Fifteen individuals (5 men, 10 women) with PFPS and 10 individuals without PFPS (4 men, 6 women) participated.

INTERVENTION(S):

The patients with PFPS completed a 3-week hip-abductor strengthening protocol; control participants did not.

MAIN OUTCOME MEASURE(S):

The dependent variables of interest were maximal isometric hip-abductor muscle strength, 2-dimensional peak knee genu valgum angle, and stride-to-stride knee-joint variability. All measures were recorded at baseline and 3 weeks later. Between-groups differences were compared using repeated-measures analyses of variance.

RESULTS:

At baseline, the PFPS group exhibited reduced strength, no difference in peak genu valgum angle, and increased stride-to-stride knee-joint variability compared with the control group. After the 3-week protocol, the PFPS group demonstrated increased strength, less pain, no change in peak genu valgum angle, and reduced stride-to-stride knee-joint variability compared with baseline.

CONCLUSIONS:

A 3-week hip-abductor muscle-strengthening protocol was effective in increasing muscle strength and decreasing pain and stride-to-stride knee-joint variability in individuals with PFPS. However, concomitant changes in peak knee genu valgum angle were not observed.

PMID:
21391799
[PubMed - indexed for MEDLINE]
PMCID:
PMC3070501
Free PMC Article

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