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Related Experiment Video

Updated: Jun 14, 2025

Subject-specific Musculoskeletal Model for Studying Bone Strain During Dynamic Motion
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Effects of Using Generic vs. Subject-Specific Muscle Properties on Spinal Load Prediction Across Different Posture

Nima Ashjaee1, Sidney Fels2, John Street3

  • 1School of Biomedical Engineering, University of British Columbia, Vancouver, BC, Canada; International Collaboration on Repair Discoveries (ICORD), University of British Columbia, Vancouver, BC, Canada.

Journal of Biomechanics
|May 25, 2025
PubMed
Summary

Subject-specific musculoskeletal models are crucial for spinal deformity management. Generic muscle properties significantly alter spinal compression loads, especially in flexed postures, highlighting the need for patient-specific data.

Keywords:
Geometry-pathMaximum isometric forceMuscle line of actionMuscle parameter sensitivityMusculoskeletal modelingOpenSimOptimal fiber lengthSubject-specific muscle propertiesTendon slack length

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Area of Science:

  • Biomechanics
  • Musculoskeletal modeling
  • Spinal deformity management

Background:

  • Subject-specific musculoskeletal models offer potential for adult spinal deformity management.
  • Generic properties in models are accessible but may reduce accuracy.
  • Lack of subject-specific soft-tissue properties is a clinical limitation.

Purpose of the Study:

  • To determine which muscle biomechanical properties and body positions show significant differences between generic and subject-specific models.
  • To assess the impact of these differences on spinal compression loads.

Main Methods:

  • Analyzed 250 subject-specific musculoskeletal models using OpenSim software.
  • Focused on four muscle parameters: geometry-path, maximum-isometric-force, optimal-fiber-length, and tendon-slack-length.
  • Evaluated 11 postures, including standing and flexed positions, using linear mixed-effects and non-parametric statistical models.

Main Results:

  • Subject-specific geometry-path (13%) and maximum-isometric-force (8%) significantly impacted spinal compression loads.
  • These differences were posture-dependent, with flexed postures showing greater sensitivity to generic parameters (17% and 6% differences, respectively).
  • Optimal-fiber-length and tendon-slack-length had minimal impact on spinal compression loads.

Conclusions:

  • Subject-specific muscle properties, particularly geometry-path and maximum-isometric-force, are essential for accurate musculoskeletal simulations, especially in flexed postures.
  • Generic properties can lead to significant deviations in spinal compression load predictions.
  • When subject-specific data is unavailable, standing posture simulations are least affected by using generic muscle properties.