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Changes in knee biomechanics after a hip-abductor strengthening protocol for runners with patellofemoral pain syndrome.
J Athl Train 2011 Mar-Apr; 46(2):142-9JA

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.

Authors+Show Affiliations

Faculty of Kinesiology, University of Calgary, AB, Canada. rferber@ucalgary.caNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

21391799

Citation

Ferber, Reed, et al. "Changes in Knee Biomechanics After a Hip-abductor Strengthening Protocol for Runners With Patellofemoral Pain Syndrome." Journal of Athletic Training, vol. 46, no. 2, 2011, pp. 142-9.
Ferber R, Kendall KD, Farr L. Changes in knee biomechanics after a hip-abductor strengthening protocol for runners with patellofemoral pain syndrome. J Athl Train. 2011;46(2):142-9.
Ferber, R., Kendall, K. D., & Farr, L. (2011). Changes in knee biomechanics after a hip-abductor strengthening protocol for runners with patellofemoral pain syndrome. Journal of Athletic Training, 46(2), pp. 142-9. doi:10.4085/1062-6050-46.2.142.
Ferber R, Kendall KD, Farr L. Changes in Knee Biomechanics After a Hip-abductor Strengthening Protocol for Runners With Patellofemoral Pain Syndrome. J Athl Train. 2011;46(2):142-9. PubMed PMID: 21391799.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Changes in knee biomechanics after a hip-abductor strengthening protocol for runners with patellofemoral pain syndrome. AU - Ferber,Reed, AU - Kendall,Karen D, AU - Farr,Lindsay, PY - 2011/3/12/entrez PY - 2011/3/12/pubmed PY - 2011/9/21/medline SP - 142 EP - 9 JF - Journal of athletic training JO - J Athl Train VL - 46 IS - 2 N2 - 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. SN - 1938-162X UR - https://www.unboundmedicine.com/medline/citation/21391799/Changes_in_knee_biomechanics_after_a_hip_abductor_strengthening_protocol_for_runners_with_patellofemoral_pain_syndrome_ L2 - https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/21391799/ DB - PRIME DP - Unbound Medicine ER -