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Scapular dyskinesis study by principal component analysis applied to 3-Dimensional kinematics scapulothoracic data

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Author(s):
Denise Martineli Rossi
Total Authors: 1
Document type: Doctoral Thesis
Press: Ribeirão Preto.
Institution: Universidade de São Paulo (USP). Faculdade de Medicina de Ribeirão Preto (PCARP/BC)
Defense date:
Examining board members:
Anamaria Siriani de Oliveira; Paula Rezende Camargo; Marisa de Cássia Registro Fonseca; Juliana de Melo Ocarino; Paulo Roberto Pereira Santiago
Advisor: Anamaria Siriani de Oliveira
Abstract

The relationship between shoulder pain and scapular dyskinesis (SDK) is still unclear. Differences between participants with and without SDK have been demonstrated, focusing on the amount of scapular motion at specific degrees of humeral elevation. However, this approach does not consider the shape of the scapular motion temporal series. Principal Component Analysis (PCA) may advance current understanding of \'abnormal\' movement patterns by considering the collinearity and the variability present in the kinematic temporal series. This study aimed to evaluate the scapular kinematics in patients with shoulder pain and in asymptomatic participants with and without SDK using PCA. Data were collected in 98 participants separated in four groups: Pain+SDK (n=24), Pain (n=25), No Pain+SDK (n=24), and No Pain (n=25). Scapulothoracic kinematic data were measured with an electromagnetic tracking device during arm elevation and lowering phases. PCA and analysis of variance were used to compare the groups. The No Pain+SDK group had a progressive increasing in anterior tilt over the elevation phase compared to the Pain (effect size=0.79) and No Pain (effect size=0.80) groups. During the arm-lowering, the Pain+SDK group had a progressive increasing in anterior tilt over this phase in comparison to the No Pain+SDK group (effect size=0.68). Therefore, PCA demonstrated differences in the scapular anterior tilt related to SDK and shoulder pain. The presence of SDK revealed a scapular pattern with progressive increasing in anterior tilt over the elevation phase. However, during the arm-lowering phase, asymptomatic participants with SDK changed their motion pattern, unlike the symptomatic group, reinforcing the suggested association between scapular modifications and shoulder symptoms. (AU)

FAPESP's process: 14/09485-0 - Scapular dyskinesis study by principal component analysis applied to 3-dimensional kinematics scapulotoracic data
Grantee:Denise Martineli Rossi
Support Opportunities: Scholarships in Brazil - Doctorate