Development of mapped stress-field boundary conditions based on a Hill-type muscle model
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|Title:||Development of mapped stress-field boundary conditions based on a Hill-type muscle model||Authors:||Cardiff, Philip
FitzPatrick, David P.
|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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