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Comparative evaluation of different spinal stability metrics.

Amir Hossein Eskandari1, Farshid Ghezelbash2, Aboulfazl Shirazi-Adl2

  • 1Institut de recherche Robert Sauvé en santé et en sécurité du travail, Montréal, Canada; Division of Applied Mechanics, Department of Mechanical Engineering, Polytechnique Montréal, Canada.

Journal of Biomechanics
|December 30, 2023
PubMed
Summary

Computational spinal stability assessments vary significantly. This study found distinct dynamical and structural measures, with limited correlation, highlighting the need for improved evaluation techniques for spine biomechanics.

Keywords:
Floquet multipliersMaximum Lyapunov exponentMusculoskeletal modelSpine stability

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Area of Science:

  • Biomechanics
  • Spinal Stability
  • Computational Modeling

Background:

  • Direct in vivo measurement of spinal stability is not feasible.
  • Computational methods like dynamic time series and structural analyses are used for estimation.
  • Clarity on differences between various stability assessment approaches and metrics is lacking.

Purpose of the Study:

  • To compare dynamical and structural stability assessment metrics during repetitive lifting.
  • To investigate the influence of cycle, phase, and load on these stability measures.
  • To determine the correlation between different stability metrics.

Main Methods:

  • 32 participants performed repetitive lifts with and without load.
  • EMG signals and 3D kinematics were collected.
  • Three dynamical (Lyapunov exponents, Floquet multipliers) and four structural stability measures were computed using an EMG-assisted musculoskeletal model.

Main Results:

  • Dynamical and structural stability outcomes varied noticeably across lifting cycles.
  • Short-term Lyapunov exponents and all structural measures were influenced by posture.
  • Weak to moderate correlations were found between structural and dynamical metrics, indicating distinct natures.

Conclusions:

  • Dynamical and structural stability metrics are largely independent and theoretically distinct.
  • Current dynamic measures show low sensitivity to posture and load, requiring further investigation.
  • There is a need for improved computational techniques for evaluating musculoskeletal stability.