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Principal component analysis of the relationship between pelvic inclination and lumbar lordosis

BACKGROUND: The purpose of this study was to describe the relationship between pelvic inclination (PI) and lumbar lordosis (LL). Pelvic inclination and pelvic tilt are two different names for the same metric. The geometrical parameters of the spine and pelvis were measured using surface topography s...

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Autores principales: Dakin, Geoff, Turner, Raymond J., Cherak, Stephana J.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: BioMed Central 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6375125/
https://www.ncbi.nlm.nih.gov/pubmed/30783632
http://dx.doi.org/10.1186/s13013-019-0175-5
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author Dakin, Geoff
Turner, Raymond J.
Cherak, Stephana J.
author_facet Dakin, Geoff
Turner, Raymond J.
Cherak, Stephana J.
author_sort Dakin, Geoff
collection PubMed
description BACKGROUND: The purpose of this study was to describe the relationship between pelvic inclination (PI) and lumbar lordosis (LL). Pelvic inclination and pelvic tilt are two different names for the same metric. The geometrical parameters of the spine and pelvis were measured using surface topography scanning, and the data was explored for any physical relationships using principal component analysis. Once widely assumed to be a direct correlation, research in the 1980s first cast doubt upon the PI to LL relationship. And yet, other studies have suggested a relationship does exist. Decades later, the rehabilitation professionals often still rely on this supposed correlation when making decisions about rehabilitation treatment interventions. This theoretical relationship requires further clarification, which is explored herein. METHODS: Surface topography imaging is a technology that has proven to be a radiation-free way to produce accurate, reliable skeletal alignment measures. Patient data from one physical rehabilitation clinic was collected at the time of initial assessment. Patients presented with a wide range of musculoskeletal complaints. Surface topography scans were performed on 107 patients at the commencement and completion of their therapy. Principal component analysis was performed on the collected data to determine how these spine and pelvic alignment parameters changed between the two points in time and what trends and/or relationships exist between the parameters. Our analysis evaluated eight spinal and pelvic measurements as input and focused on LL and PI as the two principal components at time points of beginning and completion of treatment. RESULTS: Pelvic inclination and lumbar lordosis changed during treatment but were not correlated. CONCLUSION: Our data demonstrates that pelvic inclination and lumbar lordosis do not have a predictable relationship as previously assumed.
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spelling pubmed-63751252019-02-19 Principal component analysis of the relationship between pelvic inclination and lumbar lordosis Dakin, Geoff Turner, Raymond J. Cherak, Stephana J. Scoliosis Spinal Disord Research BACKGROUND: The purpose of this study was to describe the relationship between pelvic inclination (PI) and lumbar lordosis (LL). Pelvic inclination and pelvic tilt are two different names for the same metric. The geometrical parameters of the spine and pelvis were measured using surface topography scanning, and the data was explored for any physical relationships using principal component analysis. Once widely assumed to be a direct correlation, research in the 1980s first cast doubt upon the PI to LL relationship. And yet, other studies have suggested a relationship does exist. Decades later, the rehabilitation professionals often still rely on this supposed correlation when making decisions about rehabilitation treatment interventions. This theoretical relationship requires further clarification, which is explored herein. METHODS: Surface topography imaging is a technology that has proven to be a radiation-free way to produce accurate, reliable skeletal alignment measures. Patient data from one physical rehabilitation clinic was collected at the time of initial assessment. Patients presented with a wide range of musculoskeletal complaints. Surface topography scans were performed on 107 patients at the commencement and completion of their therapy. Principal component analysis was performed on the collected data to determine how these spine and pelvic alignment parameters changed between the two points in time and what trends and/or relationships exist between the parameters. Our analysis evaluated eight spinal and pelvic measurements as input and focused on LL and PI as the two principal components at time points of beginning and completion of treatment. RESULTS: Pelvic inclination and lumbar lordosis changed during treatment but were not correlated. CONCLUSION: Our data demonstrates that pelvic inclination and lumbar lordosis do not have a predictable relationship as previously assumed. BioMed Central 2019-02-13 /pmc/articles/PMC6375125/ /pubmed/30783632 http://dx.doi.org/10.1186/s13013-019-0175-5 Text en © The Author(s). 2019 Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.
spellingShingle Research
Dakin, Geoff
Turner, Raymond J.
Cherak, Stephana J.
Principal component analysis of the relationship between pelvic inclination and lumbar lordosis
title Principal component analysis of the relationship between pelvic inclination and lumbar lordosis
title_full Principal component analysis of the relationship between pelvic inclination and lumbar lordosis
title_fullStr Principal component analysis of the relationship between pelvic inclination and lumbar lordosis
title_full_unstemmed Principal component analysis of the relationship between pelvic inclination and lumbar lordosis
title_short Principal component analysis of the relationship between pelvic inclination and lumbar lordosis
title_sort principal component analysis of the relationship between pelvic inclination and lumbar lordosis
topic Research
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6375125/
https://www.ncbi.nlm.nih.gov/pubmed/30783632
http://dx.doi.org/10.1186/s13013-019-0175-5
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