Abstract:
:A clear and rigorous definition of muscle moment-arms in the context of musculoskeletal systems modelling is presented, using classical mechanics and screw theory. The definition provides an alternative to the tendon excursion method, which can lead to incorrect moment-arms if used inappropriately due to its dependency on the choice of joint coordinates. The definition of moment-arms, and the presented construction method, apply to musculoskeletal models in which the bones are modelled as rigid bodies, the joints are modelled as ideal mechanical joints and the muscles are modelled as massless, frictionless cables wrapping over the bony protrusions, approximated using geometric surfaces. In this context, the definition is independent of any coordinate choice. It is then used to solve a muscle-force estimation problem for a simple 2D conceptual model and compared with an incorrect application of the tendon excursion method. The relative errors between the two solutions vary between 0% and 100%.
journal_name
Comput Methods Biomech Biomed Enginauthors
Ingram D,Engelhardt C,Farron A,Terrier A,Müllhaupt Pdoi
10.1080/10255842.2013.818666subject
Has Abstractpub_date
2015-01-01 00:00:00pages
506-13issue
5eissn
1025-5842issn
1476-8259journal_volume
18pub_type
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