Cargando…

The sensitivity of a lower limb model to axial rotation offsets and muscle bounds at the knee

Soft tissue artifacts during motion capture can lead to errors in kinematics and incorrect estimation of joint angles and segment motion. The aim of this study was to evaluate the effect of shank segment axial rotation and knee rotator muscle bounds on predicted muscle and joint forces in a musculos...

Descripción completa

Detalles Bibliográficos
Autores principales: Southgate, Dominic FL, Cleather, Daniel J, Weinert-Aplin, Robert A, Bull, Anthony MJ
Formato: Online Artículo Texto
Lenguaje:English
Publicado: SAGE Publications 2012
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3485020/
https://www.ncbi.nlm.nih.gov/pubmed/23025166
http://dx.doi.org/10.1177/0954411912439284
_version_ 1782248218738819072
author Southgate, Dominic FL
Cleather, Daniel J
Weinert-Aplin, Robert A
Bull, Anthony MJ
author_facet Southgate, Dominic FL
Cleather, Daniel J
Weinert-Aplin, Robert A
Bull, Anthony MJ
author_sort Southgate, Dominic FL
collection PubMed
description Soft tissue artifacts during motion capture can lead to errors in kinematics and incorrect estimation of joint angles and segment motion. The aim of this study was to evaluate the effect of shank segment axial rotation and knee rotator muscle bounds on predicted muscle and joint forces in a musculoskeletal model of the lower limb. A maximal height jump for ten subjects was analysed using the original motion data and then modified for different levels of internal and external rotation, and with the upper force bound doubled for five muscles. Both externally rotating the shank and doubling the muscle bounds increased the ability of the model to find a solution in regions of high loading. Muscle force levels in popliteus and tensor fascia latae showed statistically significant differences, but less so in plantaris, sartorius or gracilis. The shear and patellofemoral joint forces were found to be significantly affected by axial rotation during specific phases of the motion and were dependent on the amount of rotation. Fewer differences were observed when doubling the muscle bounds, except for the patellofemoral force and plantaris and sartorius muscle force, which were significantly increased in many of the jump phases. These results give an insight into the behaviour of the model and give an indication of the importance of accurate kinematics and subject-specific geometry.
format Online
Article
Text
id pubmed-3485020
institution National Center for Biotechnology Information
language English
publishDate 2012
publisher SAGE Publications
record_format MEDLINE/PubMed
spelling pubmed-34850202012-11-06 The sensitivity of a lower limb model to axial rotation offsets and muscle bounds at the knee Southgate, Dominic FL Cleather, Daniel J Weinert-Aplin, Robert A Bull, Anthony MJ Proc Inst Mech Eng H Special Issue Articles Soft tissue artifacts during motion capture can lead to errors in kinematics and incorrect estimation of joint angles and segment motion. The aim of this study was to evaluate the effect of shank segment axial rotation and knee rotator muscle bounds on predicted muscle and joint forces in a musculoskeletal model of the lower limb. A maximal height jump for ten subjects was analysed using the original motion data and then modified for different levels of internal and external rotation, and with the upper force bound doubled for five muscles. Both externally rotating the shank and doubling the muscle bounds increased the ability of the model to find a solution in regions of high loading. Muscle force levels in popliteus and tensor fascia latae showed statistically significant differences, but less so in plantaris, sartorius or gracilis. The shear and patellofemoral joint forces were found to be significantly affected by axial rotation during specific phases of the motion and were dependent on the amount of rotation. Fewer differences were observed when doubling the muscle bounds, except for the patellofemoral force and plantaris and sartorius muscle force, which were significantly increased in many of the jump phases. These results give an insight into the behaviour of the model and give an indication of the importance of accurate kinematics and subject-specific geometry. SAGE Publications 2012-09 /pmc/articles/PMC3485020/ /pubmed/23025166 http://dx.doi.org/10.1177/0954411912439284 Text en © IMechE 2012 http://creativecommons.org/licenses/by/2.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Special Issue Articles
Southgate, Dominic FL
Cleather, Daniel J
Weinert-Aplin, Robert A
Bull, Anthony MJ
The sensitivity of a lower limb model to axial rotation offsets and muscle bounds at the knee
title The sensitivity of a lower limb model to axial rotation offsets and muscle bounds at the knee
title_full The sensitivity of a lower limb model to axial rotation offsets and muscle bounds at the knee
title_fullStr The sensitivity of a lower limb model to axial rotation offsets and muscle bounds at the knee
title_full_unstemmed The sensitivity of a lower limb model to axial rotation offsets and muscle bounds at the knee
title_short The sensitivity of a lower limb model to axial rotation offsets and muscle bounds at the knee
title_sort sensitivity of a lower limb model to axial rotation offsets and muscle bounds at the knee
topic Special Issue Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3485020/
https://www.ncbi.nlm.nih.gov/pubmed/23025166
http://dx.doi.org/10.1177/0954411912439284
work_keys_str_mv AT southgatedominicfl thesensitivityofalowerlimbmodeltoaxialrotationoffsetsandmuscleboundsattheknee
AT cleatherdanielj thesensitivityofalowerlimbmodeltoaxialrotationoffsetsandmuscleboundsattheknee
AT weinertaplinroberta thesensitivityofalowerlimbmodeltoaxialrotationoffsetsandmuscleboundsattheknee
AT bullanthonymj thesensitivityofalowerlimbmodeltoaxialrotationoffsetsandmuscleboundsattheknee
AT southgatedominicfl sensitivityofalowerlimbmodeltoaxialrotationoffsetsandmuscleboundsattheknee
AT cleatherdanielj sensitivityofalowerlimbmodeltoaxialrotationoffsetsandmuscleboundsattheknee
AT weinertaplinroberta sensitivityofalowerlimbmodeltoaxialrotationoffsetsandmuscleboundsattheknee
AT bullanthonymj sensitivityofalowerlimbmodeltoaxialrotationoffsetsandmuscleboundsattheknee