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Annals of Biomedical Engineering

, Volume 41, Issue 8, pp 1787–1799 | Cite as

Consistency Among Musculoskeletal Models: Caveat Utilitor

  • David W. Wagner
  • Vahagn Stepanyan
  • James M. Shippen
  • Matthew S. DeMers
  • Robin S. Gibbons
  • Brian J. Andrews
  • Graham H. Creasey
  • Gary S. Beaupre
Article

Abstract

Musculoskeletal simulation software and model repositories have broadened the user base able to perform musculoskeletal analysis and have facilitated in the sharing of models. As the recognition of musculoskeletal modeling continues to grow as an engineering discipline, the consistency in results derived from different models and software is becoming more critical. The purpose of this study was to compare eight models from three software packages and evaluate differences in quadriceps moment arms, predicted muscle forces, and predicted tibiofemoral contact forces for an idealized knee-extension task spanning −125 to +10° of knee extension. Substantial variation among models was observed for the majority of aspects evaluated. Differences among models were influenced by knee angle, with better agreement of moment arms and tibiofemoral joint contact force occurring at low to moderate knee flexion angles. The results suggest a lack of consistency among models and that output differences are not simply an artifact of naturally occurring inter-individual differences. Although generic musculoskeletal models can easily be scaled to consistent limb lengths and use the same muscle recruitment algorithm, the results suggest those are not sufficient conditions to produce consistent muscle or joint contact forces, even for simplified models with no potential of co-contraction.

Keywords

Musculoskeletal models Muscle moment arm Joint contact force Muscle recruitment Musculoskeletal simulation Knee flexion 

Notes

Acknowledgments

Funding for this work was provided by the Dept of Veterans Affairs, Rehab R&D (Proj. A6816R) and by the Paralyzed Veterans of America Endowment for Spinal Cord Injury at Stanford University.

Conflict of interest

Matthew S. DeMers collaborated on the development of the Steele 2012 model evaluated in this manuscript. James M. Shippen is the primary developer of the Biomechanics of Bodies software used in this manuscript.

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Copyright information

© BMES (Outside the U.S.) 2013

Authors and Affiliations

  • David W. Wagner
    • 1
  • Vahagn Stepanyan
    • 2
  • James M. Shippen
    • 3
  • Matthew S. DeMers
    • 2
  • Robin S. Gibbons
    • 4
  • Brian J. Andrews
    • 5
  • Graham H. Creasey
    • 6
  • Gary S. Beaupre
    • 1
    • 2
  1. 1.Center for Tissue Regeneration, Repair, and RestorationVA Palo Alto Health Care SystemPalo AltoUSA
  2. 2.Department of Mechanical EngineeringStanford UniversityStanfordUSA
  3. 3.Industrial DesignCoventry UniversityWorcestershireUK
  4. 4.School of Sport and EducationBrunel UniversityMiddlesexUK
  5. 5.Nuffield Department of Surgical SciencesOxford UniversityOxfordUK
  6. 6.Spinal Cord Injury ServiceVA Palo Alto Health Care SystemPalo AltoUSA

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