Estimation of musculotendon parameters for scaled and subject specific musculoskeletal models using an optimization technique

Journal of Biomechanics
Luca ModeneseDavid G Lloyd

Abstract

A challenging aspect of subject specific musculoskeletal modeling is the estimation of muscle parameters, especially optimal fiber length and tendon slack length. In this study, the method for scaling musculotendon parameters published by Winby et al. (2008), J. Biomech. 41, 1682-1688, has been reformulated, generalized and applied to two cases of practical interest: 1) the adjustment of muscle parameters in the entire lower limb following linear scaling of a generic model and 2) their estimation "from scratch" in a subject specific model of the hip joint created from medical images. In the first case, the procedure maintained the muscles׳ operating range between models with mean errors below 2.3% of the reference model normalized fiber length value. In the second case, a subject specific model of the hip joint was created using segmented bone geometries and muscle volumes publicly available for a cadaveric specimen from the Living Human Digital Library (LHDL). Estimated optimal fiber lengths were found to be consistent with those of a previously published dataset for all 27 considered muscle bundles except gracilis. However, computed tendon slack lengths differed from tendon lengths measured in the LHDL cadaver, suggesting tha...Continue Reading

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Jul 9, 2016·Gait & Posture·David J SaxbyDavid G Lloyd
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Oct 19, 2016·Medicine and Science in Sports and Exercise·David John SaxbyDavid G Lloyd
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Jan 31, 2021·Journal of Biomechanics·Luca Modenese, Jean-Baptiste Renault
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