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Paper Abstract and Keywords
Presentation 2014-05-24 13:25
Improvement of a Musculoskeletal Model of the Shoulder in Consideration of the Muscular Overlap on the Bones
Yosuke Fujii, Toyohiko Hayashi (Niigata Univ.), Hiroshi Tanaka, Hiroki Ninomiya, Hiroaki Inui, Masahiko Komai, Katsuya Nobuhara (Nobuhara Hospital) MBE2014-5
Abstract (in Japanese) (See Japanese page) 
(in English) Stability of the glenohumeral joint of human beings is known to be achieved partly by the activities of the shoulder muscles. Their coordinative activities, however, have yet to be clarified. Then, computer simulations have been applied to the estimation of the muscle forces, due to the difficulty of electro-myographic analysis. Our musculoskeletal model of the shoulder consists of three different components as follows: 1) bone models; 2) muscle models; and 3) a movement model of the abduction. Because our previous muscle model is represented as line segments connecting the origin to the insertion, some of the segments have a problem of penetrating the bone models. In order to solve this problem, we improved our model into that in which the humerus model is simplified as a combination of a sphere and a cylinder, and the muscle models run along the surface of the bone models when the two models come into contact with each other. Additionally, the model of the infraspinatus, one of the shoulder muscles, was also improved into one more life-like in anatomy. Results of computer simulations demonstrated that 1) the effects of the positional change of the insertion on the muscle activities were slight; and 2) the posterior portion of the infraspinatus was activated even in the late phase of the abduction, affecting the generation of the abduction torque throughout the motion.
Keyword (in Japanese) (See Japanese page) 
(in English) shoulder / musculoskeletal model / computer simulation / estimation of muscle force / / / /  
Reference Info. IEICE Tech. Rep., vol. 114, no. 51, MBE2014-5, pp. 19-24, May 2014.
Paper # MBE2014-5 
Date of Issue 2014-05-17 (MBE) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
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reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
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Conference Information
Committee MBE  
Conference Date 2014-05-24 - 2014-05-24 
Place (in Japanese) (See Japanese page) 
Place (in English) University of Toyama 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To MBE 
Conference Code 2014-05-MBE 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Improvement of a Musculoskeletal Model of the Shoulder in Consideration of the Muscular Overlap on the Bones 
Sub Title (in English)  
Keyword(1) shoulder  
Keyword(2) musculoskeletal model  
Keyword(3) computer simulation  
Keyword(4) estimation of muscle force  
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1st Author's Name Yosuke Fujii  
1st Author's Affiliation Niigata University (Niigata Univ.)
2nd Author's Name Toyohiko Hayashi  
2nd Author's Affiliation Niigata University (Niigata Univ.)
3rd Author's Name Hiroshi Tanaka  
3rd Author's Affiliation Nobuhara Hospital and Institute of Biomechanics (Nobuhara Hospital)
4th Author's Name Hiroki Ninomiya  
4th Author's Affiliation Nobuhara Hospital and Institute of Biomechanics (Nobuhara Hospital)
5th Author's Name Hiroaki Inui  
5th Author's Affiliation Nobuhara Hospital and Institute of Biomechanics (Nobuhara Hospital)
6th Author's Name Masahiko Komai  
6th Author's Affiliation Nobuhara Hospital and Institute of Biomechanics (Nobuhara Hospital)
7th Author's Name Katsuya Nobuhara  
7th Author's Affiliation Nobuhara Hospital and Institute of Biomechanics (Nobuhara Hospital)
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Speaker Author-1 
Date Time 2014-05-24 13:25:00 
Presentation Time 25 minutes 
Registration for MBE 
Paper # MBE2014-5 
Volume (vol) vol.114 
Number (no) no.51 
Page pp.19-24 
#Pages 6 
Date of Issue 2014-05-17 (MBE) 

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