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Br J Sports Med. 2014 Jul;48(14):1088. doi: 10.1136/bjsports-2013-093305. Epub 2014 Mar 31.

Is hip strength a risk factor for patellofemoral pain? A systematic review and meta-analysis.

Author information

1
Orthopaedic Surgery Research Unit, Research and Innovation Center, Aalborg University Hospital, Aalborg, Denmark Institute of Clinical Medicine, Aarhus University, Aarhus, Denmark.
2
Orthopaedic Surgery Research Unit, Research and Innovation Center, Aalborg University Hospital, Aalborg, Denmark.
3
Division of Physiotherapy, School of Health and Rehabilitation Sciences, University of Queensland, Brisbane, Queensland, Australia.
4
Complete Sports Care, Melbourne, Victoria, Australia Pure Sports Medicine, London, UK Centre for Sport and Exercise Medicine, Queen Mary University of London Musculoskeletal Research Centre, La Trobe University, Melbourne, Australia.

Abstract

OBJECTIVE:

To evaluate and synthesise the literature on hip strength among patients with patellofemoral pain (PFP) to address the following: (1) differentiate between hip strength as a risk factor and associated deficit in PFP; (2) describe hip strength in men and women with PFP across different age ranges; (3) investigate the effects of hip strengthening on biomechanical knee variables associated with PFP development.

METHODS:

MEDLINE, CINAHL, Web of Science, SportDiscus and Google Scholar were searched in November 2013 for studies investigating hip strength among patients with PFP. Two reviewers independently assessed papers for inclusion and quality. Means and SDs were extracted from each included study to allow effect size calculations and comparisons of results.

RESULTS:

Moderate-to-strong evidence from prospective studies indicates no association between isometric hip strength and risk of developing PFP. Moderate evidence from cross-sectional studies indicates that men and women with PFP have lower isometric hip musculature strength compared to pain-free individuals. Limited evidence indicates that adolescents with PFP do not have the same strength deficits as adults with PFP.

CONCLUSIONS:

This review highlights a possible discrepancy between prospective and cross-sectional research. Cross-sectional studies indicate that adult men and women with PFP appear to have lower hip strength compared to pain-free individuals. Contrary to this, a limited number of prospective studies indicate that there may be no association between isometric hip strength and risk of developing PFP. Therefore, reduced hip strength may be a result of PFP rather than the cause.

KEYWORDS:

Knee; Strength Isometric Isokinetic

PMID:
24687010
DOI:
10.1136/bjsports-2013-093305
[Indexed for MEDLINE]

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