Visual Scapular Dyskinesis: Kinematics and Muscle Activity Alterations in Patients With Subacromial Impingement Syndrome

Visual Scapular Dyskinesis: Kinematics and Muscle Activity Alterations in Patients With Subacromial Impingement Syndrome

Autor Lopes, Andrea Diniz Autor UNIFESP Google Scholar
Timmons, Mark K. Google Scholar
Grover, Molly Google Scholar
Ciconelli, Rozana Mesquita Autor UNIFESP Google Scholar
Michener, Lori A. Google Scholar
Instituição Universidade Federal de São Paulo (UNIFESP)
AT Still Univ
Marshall Univ
Virginia Commonwealth Univ
Univ So Calif
Resumo Objective: To characterize scapular kinematics and shoulder muscle activity in patients with subacromial impingement syndrome, with and without visually identified scapular dyskinesis.Design: Cross-sectional study.Setting: Laboratory.Participants: Participants with subacromial impingement syndrome (N=38) were visually classified using a scapular dyskinesis test with obvious scapular dyskinesis (n=19) or normal scapular motion (n=19).Interventions: Not applicable.Main Outcome Measures: An electromagnetic motion capture system measured 3-dimensional kinematics of the thorax, humerus, and scapula. Simultaneously, surface electromyography was used to measure muscle activity of the upper, middle, and lower trapezius; serratus anterior; and infraspinatus during ascending and descending phases of weighted shoulder flexion. Separate mixed-model analyses of variance for the ascending and descending phases of shoulder flexion compared kinematics and muscle activity between the 2 groups. Shoulder disability was assessed with the Pennsylvania Shoulder Score (Penn).Results: the group with obvious dyskinesis reported 6 points lower on Penn shoulder function (0-60 points), exhibited a main group effect of less scapular external rotation of 2.1 degrees during ascent and 2.5 degrees during descent, and had 12.0% higher upper trapezius muscle activity during ascent in the 30 to 60 interval.Conclusions: Patients with obvious dyskinesis and subacromial impingement syndrome have reduced scapular external rotation and increased upper trapezius muscle activity, along with a greater loss of shoulder function compared with those without dyskinesis. These biomechanical alterations can lead to or be caused by scapular dyskinesis. Future studies should determine if correction of these deficits will eliminate scapular dyskinesis and improve patient-rated shoulder use. (C) 2015 by the American Congress of Rehabilitation Medicine
Assunto Electromyography
Shoulder impingement syndrome
Idioma Inglês
Financiador Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Interprofessional Polytrauma and Traumatic Brain Injury Rehabilitation Research Fellowship
VA Advanced Fellowships & Professional Development, Office of Academic Affiliations, Department of Veterans Affairs
Data 2015-02-01
Publicado em Archives of Physical Medicine and Rehabilitation. Philadelphia: W B Saunders Co-Elsevier Inc, v. 96, n. 2, p. 298-306, 2015.
ISSN 0003-9993 (Sherpa/Romeo, fator de impacto)
Editor Elsevier B.V.
Extensão 298-306
Direito de acesso Acesso restrito
Tipo Artigo
Web of Science WOS:000348751800017

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