Abstract
Human musculoskeletal models have revealed the general patterns of muscle recruitment during daily activities. Nonetheless, the consistency of dynamics calculations from different musculoskeletal simulation packages is not well understood. The objective of this study was to understand the effect of the simulation solver and simulation model on the musculoskeletal simulation results using lower limb models in OpenSim and AnyBody modeling system. Matched musculoskeletal model and generic model in both systems were simulated using the external forces and joint kinematics measured at the Fourth and Sixth Grand Challenge Competitions to Predict In-Vivo Knee Loads. Muscle activation levels in lower limb were compared between the packages, and against the electromyography signals from the aforementioned competitions. The muscle activation levels were very similar between the two packages when matched models were simulated, indicating high consistency between the solvers. In the generic models, the root mean square (RMS) difference in the muscle activation levels was high at 0.15 and 0.19 for ideal force generator muscles and modified Hill-type muscles, respectively. The RMS and phase differences were high between the muscle activations and electromyography signals. Comparisons will help understand the similarities and differences between the musculoskeletal simulation packages and the effects of the model differences on simulation results.
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Recommended by Associate Editor Moon Ki Kim
Younguk Kim received his B.S. degree in 2013 from Seoul National University. He is currently pursuing his Ph.D. in Mechanical Engineering at Seoul National University under the supervision of Professor Kunwoo Lee. His research interests include human musculoskeletal simulation based on multibody system dynamics.
Yihwan Jung received his B.S., M.S., and Ph.D. in 2012, 2014, and 2018 from Chung-Ang University, Seoul, Republic of Korea, respectively. His research interests include human musculoskeletal simulation and joint soft tissue.
Woosung Choi received his B.S. degree in 2014 from Soongsil University. He received his M.S. degree in 2016 from Seoul National University. His research interests include human musculoskeletal simulation based on multibody system dynamics.
Kunwoo Lee received his B.S. degree in 1978 from Seoul National University. He received his M.S. and Ph.D. in Mechanical Engineering in 1981 and 1984, respectively, from MIT. He is currently a Professor at Seoul National University, Seoul, Republic of Korea. His research interests include human-centered computer- aided systems and 3D printers.
Seungbum Koo received his B.S. and M.S. degrees in 2000 and 2002 from Seoul National University, respectively. He received his Ph.D. in Mechanical Engineering in 2006 from Stanford University. He is currently an Associate Professor at Korea Advanced Institute of Science and Technology, Daejeon, South Korea. His research interests include human musculoskeletal dynamics simulation.
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Kim, Y., Jung, Y., Choi, W. et al. Similarities and differences between musculoskeletal simulations of OpenSim and AnyBody modeling system. J Mech Sci Technol 32, 6037–6044 (2018). https://doi.org/10.1007/s12206-018-1154-0
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DOI: https://doi.org/10.1007/s12206-018-1154-0