Development of mapped stress-field boundary conditions based on a Hill-type muscle model

Title: Development of mapped stress-field boundary conditions based on a Hill-type muscle model
Authors: Cardiff, Philip
Karac, Aleksandar
FitzPatrick, David P.
et al.
Permanent link: http://hdl.handle.net/10197/5921
Date: 7-Apr-2014
Abstract: Forces generated in the muscles and tendons actuate the movement of the skeleton. Accurate estimation and application of these musculotendon forces in a continuum model is not a trivial matter. Frequently, musculotendon attachments are approximated as point forces; however, accurate estimation of local mechanics requires a more realistic application of musculotendon forces. This paper describes the development of mapped Hill-type muscle models as boundary conditions for a finite volume model of the hip joint, where the calculated muscle fibres map continuously between attachment sites. The applied muscle forces are calculated using active Hill-type models, where input electromyography signals are determined from gait analysis. Realistic muscle attachment sites are determined directly from tomography images. The mapped muscle boundary conditions, implemented in a finite volume structural OpenFOAM (ESI-OpenCFD, Bracknell, UK) solver, are employed to simulate the mid-stance phase of gait using a patient-specific natural hip joint, and a comparison is performed with the standard point load muscle approach. It is concluded that physiological joint loading is not accurately represented by simplistic muscle point loading conditions; however, when contact pressures are of sole interest, simplifying assumptions with regard to muscular forces may be valid.
Type of material: Journal Article
Publisher: Wiley Blackwell (John Wiley & Sons)
Copyright (published version): 2014 Wiley Blackwell (John Wiley & Sons)
Keywords: Active hill muscle models;Mapped muscle boundary conditions;Finite volume method;OpenFOAM;Electromyography;Contact stress analysis
DOI: 10.1002/cnm.2634
Language: en
Status of Item: Peer reviewed
Appears in Collections:Mechanical & Materials Engineering Research Collection

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