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Published in: BMC Musculoskeletal Disorders 1/2008

Open Access 01-12-2008 | Research article

The relative timing of VMO and VL in the aetiology of anterior knee pain: a systematic review and meta-analysis

Authors: Rachel Chester, Toby O Smith, David Sweeting, John Dixon, Sarah Wood, Fujian Song

Published in: BMC Musculoskeletal Disorders | Issue 1/2008

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Abstract

Background

Anterior knee pain (AKP) is a common musculoskeletal complaint. It has been suggested that one factor that may contribute to the presence of AKP is a delay in the recruitment of the vastus medialis oblique muscle (VMO) relative to the vastus lateralis muscle (VL). There is however little consensus within the literature regarding the existence or nature of any such delay in the recruitment of the VMO within the AKP population. The purpose of this systematic review and meta-analysis was to examine the relative timing of onset of the VMO and VL in those with AKP in comparison to the asymptomatic population.

Methods

The bibliographic databases AMED, British Nursing Index, CINAHL, EMBASE, Ovid Medline, PEDro, Pubmed and the Cochrane Library were searched for studies comparing the timing of EMG onset of the VMO and VL in those with AKP versus the asymptomatic population. Studies fulfilling the inclusion criteria were independently assessed. Heterogeneity across the studies was measured. A meta-analysis of results was completed for those studies where adequate data was supplied. Where comparable methodologies had been used, results were pooled and analysed.

Results

Fourteen studies met the inclusion criteria; one prospective and thirteen observational case control. Eleven compared VMO and VL EMG onset times during voluntary active tasks while four investigated reflex response times. All used convenience sampling and did not state blinding of the assessor. Study methodologies/testing and assessment procedures varied and there was considerable heterogeneity within individual samples. Whilst a trend was identified towards a delay in onset of VMO relative to the VL in the AKP population during both voluntary active tasks and reflex activity, a substantial degree of heterogeneity across the pooled studies was identified (I2 = 69.9–93.4%, p < 0.01).

Conclusion

Findings are subject to substantial and unexplained heterogeneity. A trend was demonstrated towards a delayed onset of VMO relative to VL in those with AKP in comparison to those without. However not all AKP patients demonstrate a VMO-VL dysfunction, and this is compounded by normal physiological variability in the healthy population. The clinical and therapeutic significance is therefore difficult to assess.
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Metadata
Title
The relative timing of VMO and VL in the aetiology of anterior knee pain: a systematic review and meta-analysis
Authors
Rachel Chester
Toby O Smith
David Sweeting
John Dixon
Sarah Wood
Fujian Song
Publication date
01-12-2008
Publisher
BioMed Central
Published in
BMC Musculoskeletal Disorders / Issue 1/2008
Electronic ISSN: 1471-2474
DOI
https://doi.org/10.1186/1471-2474-9-64

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