Development and application of stereo camera-based upper extremity workspace evaluation in patients with neuromuscular diseases.

<h4>Background</h4>The concept of reachable workspace is closely tied to upper limb joint range of motion and functional capability. Currently, no practical and cost-effective methods are available in clinical and research settings to provide arm-function evaluation using an individual&#...

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Autores principales:	Gregorij Kurillo, Jay J Han, Richard T Abresch, Alina Nicorici, Posu Yan, Ruzena Bajcsy
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2012
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/fb704b9f04a8404e99351cff221aa4c9
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spelling	oai:doaj.org-article:fb704b9f04a8404e99351cff221aa4c92021-11-18T07:05:21ZDevelopment and application of stereo camera-based upper extremity workspace evaluation in patients with neuromuscular diseases.1932-620310.1371/journal.pone.0045341https://doaj.org/article/fb704b9f04a8404e99351cff221aa4c92012-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/23028947/pdf/?tool=EBIhttps://doaj.org/toc/1932-6203<h4>Background</h4>The concept of reachable workspace is closely tied to upper limb joint range of motion and functional capability. Currently, no practical and cost-effective methods are available in clinical and research settings to provide arm-function evaluation using an individual's three-dimensional (3D) reachable workspace. A method to intuitively display and effectively analyze reachable workspace would not only complement traditional upper limb functional assessments, but also provide an innovative approach to quantify and monitor upper limb function.<h4>Methodology/principal findings</h4>A simple stereo camera-based reachable workspace acquisition system combined with customized 3D workspace analysis algorithm was developed and compared against a sub-millimeter motion capture system. The stereo camera-based system was robust, with minimal loss of data points, and with the average hand trajectory error of about 40 mm, which resulted to ~5% error of the total arm distance. As a proof-of-concept, a pilot study was undertaken with healthy individuals (n = 20) and a select group of patients with various neuromuscular diseases and varying degrees of shoulder girdle weakness (n = 9). The workspace envelope surface areas generated from the 3D hand trajectory captured by the stereo camera were compared. Normalization of acquired reachable workspace surface areas to the surface area of the unit hemi-sphere allowed comparison between subjects. The healthy group's relative surface areas were 0.618±0.09 and 0.552±0.092 (right and left), while the surface areas for the individuals with neuromuscular diseases ranged from 0.03 and 0.09 (the most severely affected individual) to 0.62 and 0.50 (very mildly affected individual). Neuromuscular patients with severe arm weakness demonstrated movement largely limited to the ipsilateral lower quadrant of their reachable workspace.<h4>Conclusions/significance</h4>The findings indicate that the proposed stereo camera-based reachable workspace analysis system is capable of distinguishing individuals with varying degrees of proximal upper limb functional impairments.Gregorij KurilloJay J HanRichard T AbreschAlina NicoriciPosu YanRuzena BajcsyPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 7, Iss 9, p e45341 (2012)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Gregorij Kurillo Jay J Han Richard T Abresch Alina Nicorici Posu Yan Ruzena Bajcsy Development and application of stereo camera-based upper extremity workspace evaluation in patients with neuromuscular diseases.
description	<h4>Background</h4>The concept of reachable workspace is closely tied to upper limb joint range of motion and functional capability. Currently, no practical and cost-effective methods are available in clinical and research settings to provide arm-function evaluation using an individual's three-dimensional (3D) reachable workspace. A method to intuitively display and effectively analyze reachable workspace would not only complement traditional upper limb functional assessments, but also provide an innovative approach to quantify and monitor upper limb function.<h4>Methodology/principal findings</h4>A simple stereo camera-based reachable workspace acquisition system combined with customized 3D workspace analysis algorithm was developed and compared against a sub-millimeter motion capture system. The stereo camera-based system was robust, with minimal loss of data points, and with the average hand trajectory error of about 40 mm, which resulted to ~5% error of the total arm distance. As a proof-of-concept, a pilot study was undertaken with healthy individuals (n = 20) and a select group of patients with various neuromuscular diseases and varying degrees of shoulder girdle weakness (n = 9). The workspace envelope surface areas generated from the 3D hand trajectory captured by the stereo camera were compared. Normalization of acquired reachable workspace surface areas to the surface area of the unit hemi-sphere allowed comparison between subjects. The healthy group's relative surface areas were 0.618±0.09 and 0.552±0.092 (right and left), while the surface areas for the individuals with neuromuscular diseases ranged from 0.03 and 0.09 (the most severely affected individual) to 0.62 and 0.50 (very mildly affected individual). Neuromuscular patients with severe arm weakness demonstrated movement largely limited to the ipsilateral lower quadrant of their reachable workspace.<h4>Conclusions/significance</h4>The findings indicate that the proposed stereo camera-based reachable workspace analysis system is capable of distinguishing individuals with varying degrees of proximal upper limb functional impairments.
format	article
author	Gregorij Kurillo Jay J Han Richard T Abresch Alina Nicorici Posu Yan Ruzena Bajcsy
author_facet	Gregorij Kurillo Jay J Han Richard T Abresch Alina Nicorici Posu Yan Ruzena Bajcsy
author_sort	Gregorij Kurillo
title	Development and application of stereo camera-based upper extremity workspace evaluation in patients with neuromuscular diseases.
title_short	Development and application of stereo camera-based upper extremity workspace evaluation in patients with neuromuscular diseases.
title_full	Development and application of stereo camera-based upper extremity workspace evaluation in patients with neuromuscular diseases.
title_fullStr	Development and application of stereo camera-based upper extremity workspace evaluation in patients with neuromuscular diseases.
title_full_unstemmed	Development and application of stereo camera-based upper extremity workspace evaluation in patients with neuromuscular diseases.
title_sort	development and application of stereo camera-based upper extremity workspace evaluation in patients with neuromuscular diseases.
publisher	Public Library of Science (PLoS)
publishDate	2012
url	https://doaj.org/article/fb704b9f04a8404e99351cff221aa4c9
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Development and application of stereo camera-based upper extremity workspace evaluation in patients with neuromuscular diseases.

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