Journal of Mechanical Science and Technology

, Volume 32, Issue 12, pp 6037–6044 | Cite as

Similarities and differences between musculoskeletal simulations of OpenSim and AnyBody modeling system

  • Younguk Kim
  • Yihwan Jung
  • Woosung Choi
  • Kunwoo Lee
  • Seungbum KooEmail author


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.


Human musculoskeletal simulation Kinematics and kinetics Muscle activation Electromyography 


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Copyright information

© The Korean Society of Mechanical Engineers and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Younguk Kim
    • 1
  • Yihwan Jung
    • 2
  • Woosung Choi
    • 1
  • Kunwoo Lee
    • 1
  • Seungbum Koo
    • 3
    Email author
  1. 1.School of Mechanical and Aerospace EngineeringSeoul National UniversitySeoulKorea
  2. 2.School of Mechanical EngineeringChung-Ang UniversitySeoulKorea
  3. 3.Department of Mechanical EngineeringKorea Advanced Institute of Science and TechnologyDaejeonKorea

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