Key result
A novel fiber-based muscle model using one-dimensional cables offers a computationally efficient approach that is closer to real physiology than standard Hill-type models.
A novel fiber-based muscle model provides a computationally efficient and physiologically realistic approach for forward dynamics simulations of the musculoskeletal system.
May enhance musculoskeletal simulations in research; leaves open clinical validation and adoption.
This paper presents a novel fiber-based muscle model for the forward dynamics of the musculoskeletal system. While bones are represented by rigid bodies, the muscles are taken into account by means of one-dimensional cables that obey the laws of continuum mechanics. In contrast to standard force elements such as the Hill-type muscle model, this approach is close to the real physiology and also avoids the issue of wobbling masses. On the other hand, the computational cost is rather low in comparison with full 3D continuum mechanics simulations. The cable model includes sliding contact between individual fibers as well as between fibers and bones. For the discretization, cubic finite elements are employed in combination with implicit time stepping. Several validation studies and the simulation of a motion scenario for the upper limb demonstrate the potential of the fiber-based approach.
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Gfrerer et al. (2021) studied Skeletal muscle mechanics. Fiber-based cable model for skeletal muscles vs. Hill-type muscle models and 3D continuum mechanics models was evaluated. A novel fiber-based muscle model using one-dimensional cables offers a computationally efficient approach that is closer to real physiology than standard Hill-type models.
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