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Muscle activation patterns in patients with recurrent shoulder instability
PURPOSE: The aim of this study is to present muscle patterns observed with the direction of instability in a series of patients presenting with recurrent shoulder instability. MATERIALS AND METHODS: A retrospective review was carried out on shoulder instability cases referred for fine wire dynamic e...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Medknow Publications & Media Pvt Ltd
2012
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3590699/ https://www.ncbi.nlm.nih.gov/pubmed/23493512 http://dx.doi.org/10.4103/0973-6042.106221 |
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author | Jaggi, Anju Noorani, Ali Malone, Alex Cowan, Joseph Lambert, Simon Bayley, Ian |
author_facet | Jaggi, Anju Noorani, Ali Malone, Alex Cowan, Joseph Lambert, Simon Bayley, Ian |
author_sort | Jaggi, Anju |
collection | PubMed |
description | PURPOSE: The aim of this study is to present muscle patterns observed with the direction of instability in a series of patients presenting with recurrent shoulder instability. MATERIALS AND METHODS: A retrospective review was carried out on shoulder instability cases referred for fine wire dynamic electromyography (DEMG) studies at a specialist upper limb centre between 1981 and 2003. An experienced consultant clinical neurophysiologist performed dual needle insertion into four muscles (pectoralis major (PM), latissimus dorsi (LD), anterior deltoid (AD) and infraspinatus (IS)) in shoulders that were suspected to have increased or suppressed activation of muscles that could be contributing to the instability. Raw EMG signals were obtained while subjects performed simple uniplanar movements of the shoulder. The presence or absence of muscle activation was noted and compared to clinical diagnosis and direction of instability. RESULTS: A total of 140 (26.6%) shoulders were referred for fine wire EMG, and 131 studies were completed. Of the shoulders tested, 122 shoulders (93%) were identified as having abnormal patterns and nine had normal patterns. PM was found to be more active in 60% of shoulders presenting with anterior instability. LD was found to be more active in 81% of shoulders with anterior instability and 80% with posterior instability. AD was found to be more active in 22% of shoulders with anterior instability and 18% with posterior instability. IS was found to be inappropriately inactive in only 3% of shoulders with anterior instability but in 25% with posterior instability. Clinical assessment identified 93% of cases suspected to have muscle patterning, but the specificity of the clinical assessment was only correct in 11% of cases. CONCLUSION: The DEMG results suggest that increased activation of LD may play a role in both anterior and posterior shoulder instability; increased activation of PM may play a role in anterior instability. |
format | Online Article Text |
id | pubmed-3590699 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2012 |
publisher | Medknow Publications & Media Pvt Ltd |
record_format | MEDLINE/PubMed |
spelling | pubmed-35906992013-03-14 Muscle activation patterns in patients with recurrent shoulder instability Jaggi, Anju Noorani, Ali Malone, Alex Cowan, Joseph Lambert, Simon Bayley, Ian Int J Shoulder Surg Original Article PURPOSE: The aim of this study is to present muscle patterns observed with the direction of instability in a series of patients presenting with recurrent shoulder instability. MATERIALS AND METHODS: A retrospective review was carried out on shoulder instability cases referred for fine wire dynamic electromyography (DEMG) studies at a specialist upper limb centre between 1981 and 2003. An experienced consultant clinical neurophysiologist performed dual needle insertion into four muscles (pectoralis major (PM), latissimus dorsi (LD), anterior deltoid (AD) and infraspinatus (IS)) in shoulders that were suspected to have increased or suppressed activation of muscles that could be contributing to the instability. Raw EMG signals were obtained while subjects performed simple uniplanar movements of the shoulder. The presence or absence of muscle activation was noted and compared to clinical diagnosis and direction of instability. RESULTS: A total of 140 (26.6%) shoulders were referred for fine wire EMG, and 131 studies were completed. Of the shoulders tested, 122 shoulders (93%) were identified as having abnormal patterns and nine had normal patterns. PM was found to be more active in 60% of shoulders presenting with anterior instability. LD was found to be more active in 81% of shoulders with anterior instability and 80% with posterior instability. AD was found to be more active in 22% of shoulders with anterior instability and 18% with posterior instability. IS was found to be inappropriately inactive in only 3% of shoulders with anterior instability but in 25% with posterior instability. Clinical assessment identified 93% of cases suspected to have muscle patterning, but the specificity of the clinical assessment was only correct in 11% of cases. CONCLUSION: The DEMG results suggest that increased activation of LD may play a role in both anterior and posterior shoulder instability; increased activation of PM may play a role in anterior instability. Medknow Publications & Media Pvt Ltd 2012 /pmc/articles/PMC3590699/ /pubmed/23493512 http://dx.doi.org/10.4103/0973-6042.106221 Text en Copyright: © International Journal of Shoulder Surgery http://creativecommons.org/licenses/by-nc-sa/3.0 This is an open-access article distributed under the terms of the Creative Commons Attribution-Noncommercial-Share Alike 3.0 Unported, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. |
spellingShingle | Original Article Jaggi, Anju Noorani, Ali Malone, Alex Cowan, Joseph Lambert, Simon Bayley, Ian Muscle activation patterns in patients with recurrent shoulder instability |
title | Muscle activation patterns in patients with recurrent shoulder instability |
title_full | Muscle activation patterns in patients with recurrent shoulder instability |
title_fullStr | Muscle activation patterns in patients with recurrent shoulder instability |
title_full_unstemmed | Muscle activation patterns in patients with recurrent shoulder instability |
title_short | Muscle activation patterns in patients with recurrent shoulder instability |
title_sort | muscle activation patterns in patients with recurrent shoulder instability |
topic | Original Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3590699/ https://www.ncbi.nlm.nih.gov/pubmed/23493512 http://dx.doi.org/10.4103/0973-6042.106221 |
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