Canonical Correlations between Body Postural Variables in the Sagittal Plane and Scoliotic Variables in School-Children

Jacek Wilczynski,Natalia Habik,Katarzyna Bieniek,Sylwia Janecka,Przemyslaw Karolak

doi:10.5539/mas.v12n2p109

Jacek Wilczynski, Natalia Habik + Show 3 more

Open Access

https://doi.org/10.5539/mas.v12n2p109

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Abstract

The aim of the study was analysis of the canonical correlations between body posture variables in the sagittal plane and scoliotic variables among school-children. The study included 28 girls aged 7-18. The Moiré photogrammetric method was used in the research. On the basis of the value of spine curvature angle, scoliotic posture: 1-9°; and scoliosis: ≥10° were distinguished. There were 21 (75%) with scoliotic posture and 7 (25%) with scoliosis. In the canonical correlation regarding body posture variables in the sagittal plane, the largest shares concerned: trunk inclination angle (0.035), alpha angle (0.072), angle of chest kyphosis (0.383), length of lumbar lordosis-(-0.301), actual angle of lumbar lordosis/total spine length (-1.067). In the canonical correlation regarding scoliotic variables, the largest shares were related to: shoulder asymmetry – right higher (-0.577), shoulder blade asymmetry – left higher (0.202), absolute pelvis tilt angle (-0.811), coefficient of shoulder asymmetry relative to C7 (0.324), depth of primary curvature/total spine length (0.420), primary curvature angle (0.032), length of secondary curvature/total spine length (-0.003). The high value of the canonical correlation coefficient despite lack of significance (R=0.72963; p=0.40075) indicates the possibility of the occurrence of a strong correlation of both sets of variables that can be demonstrated with a larger sample size. In the selection of scoliosis treatment method, the size of the postural variables in the sagittal plane should be taken into account, and each patient’s case should be individually considered.

Highlights

In the second half of the 20th century, works on distal spine deformities in scoliosis patients appeared (Somerville, 1952)
Canonical correlation analysis requires that each canonic variable be independent an variable
As a result of exploratory factor analysis with Varimax rotation, among the 23 normalized variables characterizing the posture of the body in the sagittal plane, 5 orthogonal factors were identified

Summary

Introduction

In the second half of the 20th century, works on distal spine deformities in scoliosis patients appeared (Somerville, 1952). From a functional point of view, it is more important than the external hump as it occupies the space required for internal organs (Tylman & Fiałkowski, 1983; Janssen, de Wilde, Kouwenhoven & Castelein, 2011).It increases with the progression of scoliosis and is responsible for distant chest complications (Negrini S, Negrini F, Fusco & Zaina, 2011; Glowacki et al, 2013). Scoliosis is considered a multi-faceted distortion, in which, apart from deviation in the frontal plane, changes in the size of the curvatures in the sagittal plane as well the rotation and torsion of the vertebrae occur (Glowacki, Misterska, Adamczyk & Latuszewska, 2013; Yaszay et al, 2017).

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