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Functional estimation of bony segment lengths using magneto-inertial sensing: Application to the humerus

Inertial sensor technology has assumed an increasingly important role in the field of human motion analysis. However, the reliability of the kinematic estimates could still be critical for specific applications in the field of functional evaluation and motor rehabilitation. Within this context, the...

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Autores principales: Crabolu, Michele, Pani, Danilo, Raffo, Luigi, Conti, Maurizio, Cereatti, Andrea
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6135500/
https://www.ncbi.nlm.nih.gov/pubmed/30208109
http://dx.doi.org/10.1371/journal.pone.0203861
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author Crabolu, Michele
Pani, Danilo
Raffo, Luigi
Conti, Maurizio
Cereatti, Andrea
author_facet Crabolu, Michele
Pani, Danilo
Raffo, Luigi
Conti, Maurizio
Cereatti, Andrea
author_sort Crabolu, Michele
collection PubMed
description Inertial sensor technology has assumed an increasingly important role in the field of human motion analysis. However, the reliability of the kinematic estimates could still be critical for specific applications in the field of functional evaluation and motor rehabilitation. Within this context, the definition of subject-specific multi-body kinematic models is crucial since it affects the accuracy and repeatability of movement reconstruction. A key step for kinematic model calibration is the determination of bony segment lengths. This study proposes a functional approach for the in vivo estimation of the humerus length using a single magneto-inertial measurement unit (MIMU) positioned on the right distal posterior forearm. The humerus length was estimated as the distance between the shoulder elevation axis and the elbow flexion–extension axis. The calibration exercise involved five shoulder elevations in the sagittal plane with the elbow completely extended and five elbow flexion–extensions with the upper arm rigidly aligned to the trunk. Validation of the method was conducted on five healthy subjects using the humerus length computed from magnetic resonance imaging as the gold standard. The method showed mean absolute errors of 12 ± 9 mm, which were in the estimate of the humerus length. When using magneto-inertial technology, the proposed functional method represents a promising alternative to the regressive methods or manual measurements for performing kinematic model calibrations. Although the proposed methodology was validated for the estimation of the humerus length, the same approach can be potentially extended to other body segments.
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spelling pubmed-61355002018-09-27 Functional estimation of bony segment lengths using magneto-inertial sensing: Application to the humerus Crabolu, Michele Pani, Danilo Raffo, Luigi Conti, Maurizio Cereatti, Andrea PLoS One Research Article Inertial sensor technology has assumed an increasingly important role in the field of human motion analysis. However, the reliability of the kinematic estimates could still be critical for specific applications in the field of functional evaluation and motor rehabilitation. Within this context, the definition of subject-specific multi-body kinematic models is crucial since it affects the accuracy and repeatability of movement reconstruction. A key step for kinematic model calibration is the determination of bony segment lengths. This study proposes a functional approach for the in vivo estimation of the humerus length using a single magneto-inertial measurement unit (MIMU) positioned on the right distal posterior forearm. The humerus length was estimated as the distance between the shoulder elevation axis and the elbow flexion–extension axis. The calibration exercise involved five shoulder elevations in the sagittal plane with the elbow completely extended and five elbow flexion–extensions with the upper arm rigidly aligned to the trunk. Validation of the method was conducted on five healthy subjects using the humerus length computed from magnetic resonance imaging as the gold standard. The method showed mean absolute errors of 12 ± 9 mm, which were in the estimate of the humerus length. When using magneto-inertial technology, the proposed functional method represents a promising alternative to the regressive methods or manual measurements for performing kinematic model calibrations. Although the proposed methodology was validated for the estimation of the humerus length, the same approach can be potentially extended to other body segments. Public Library of Science 2018-09-12 /pmc/articles/PMC6135500/ /pubmed/30208109 http://dx.doi.org/10.1371/journal.pone.0203861 Text en © 2018 Crabolu et al http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
spellingShingle Research Article
Crabolu, Michele
Pani, Danilo
Raffo, Luigi
Conti, Maurizio
Cereatti, Andrea
Functional estimation of bony segment lengths using magneto-inertial sensing: Application to the humerus
title Functional estimation of bony segment lengths using magneto-inertial sensing: Application to the humerus
title_full Functional estimation of bony segment lengths using magneto-inertial sensing: Application to the humerus
title_fullStr Functional estimation of bony segment lengths using magneto-inertial sensing: Application to the humerus
title_full_unstemmed Functional estimation of bony segment lengths using magneto-inertial sensing: Application to the humerus
title_short Functional estimation of bony segment lengths using magneto-inertial sensing: Application to the humerus
title_sort functional estimation of bony segment lengths using magneto-inertial sensing: application to the humerus
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6135500/
https://www.ncbi.nlm.nih.gov/pubmed/30208109
http://dx.doi.org/10.1371/journal.pone.0203861
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