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Hill-type muscle models are highly preferred as phenomenological models for musculoskeletal simulation studies despite their introduction almost a century ago. The use of simple Hill-type models in simulations, instead of more recent cross-bridge models, is well justified since computationally ‘light-weight’—although less accurate—Hill-type models have great value for large-scale simulations. However, this article aims to invite discussion on numerical instability issues of Hill-type muscle models in simulation studies, which can lead to computational failures and, therefore, cannot be simply dismissed as an inevitable but acceptable consequence of simplification. We will first revisit the basic premises and assumptions on the force–length and force–velocity relationships that Hill-type models are based upon, and their often overlooked but major theoretical limitations. We will then use several simple conceptual simulation studies to discuss how these numerical instability issues can manifest as practical computational problems. Lastly, we will review how such numerical instability issues are dealt with, mostly in an ad hoc fashion, in two main areas of application: musculoskeletal biomechanics and computer animation.more » « less
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Lieber, Richard L. ; Roberts, Thomas J. ; Blemker, Silvia S. ; Lee, Sabrina S. ; Herzog, Walter ( , Journal of NeuroEngineering and Rehabilitation)
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Powers, Krysta ; Joumaa, Venus ; Jinha, Azim ; Moo, Eng Kuan ; Smith, Ian Curtis ; Nishikawa, Kiisa ; Herzog, Walter ( , The Journal of Experimental Biology)
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Xia, Yang ; Darling, Eric M. ; Herzog, Walter ( , Journal of Orthopaedic Research)