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

    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.

    Links

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    Authors+Show Affiliations

    Ferber R
    ,

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

    Kendall KD
    ,
    Farr L

    Source

    MeSH

    Adult
    Athletes
    Biomechanical Phenomena
    Female
    Hip
    Humans
    Knee
    Knee Joint
    Male
    Muscle Strength
    Muscle, Skeletal
    Muscles
    Pain Measurement
    Patellofemoral Pain Syndrome
    Range of Motion, Articular
    Rehabilitation
    Resistance Training
    Running

    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 -