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Updated: Sep 4, 2025

Oscillation and Reaction Board Techniques for Estimating Inertial Properties of a Below-knee Prosthesis
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The Effects of Prosthesis Inertial Parameters on Inverse Dynamics: A Probabilistic Analysis.

Brecca M M Gaffney1, Cory L Christiansen2, Amanda M Murray3

  • 1Department of Mechanical and Materials Engineering, Human Dynamics Laboratory, University of Denver, Denver, CO 80208

Journal of Verification, Validation, and Uncertainty Quantification
|July 14, 2022
PubMed
Summary
This summary is machine-generated.

Prosthetic inertial parameters significantly impact joint kinetics calculations in individuals with transtibial amputation (TTA). Accurate shank mass measurement is crucial for reliable inverse dynamics (ID) analysis during walking.

Keywords:
amputeeinverse dynamicsprobabilistic analysisprosthesis inertial parameters

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Area of Science:

  • Biomechanics
  • Prosthetics and Orthotics
  • Human Movement Analysis

Background:

  • Joint kinetic measurement is vital for understanding compensatory movements in individuals with transtibial amputation (TTA).
  • Inverse dynamics (ID) calculations for joint kinetics rely on segment kinematics, external forces, and prosthetic inertial parameters (PIPS).
  • The specific impact of PIPs on ID calculations remains unclear.

Purpose of the Study:

  • To evaluate the significance of parameterizing PIPs in inverse dynamics (ID) calculations.
  • To assess the influence of uncertainty in PIPs on joint kinetic outcomes using probabilistic analysis.

Main Methods:

  • Monte Carlo simulations were employed to analyze the effect of PIP uncertainty on ID.
  • Experimentally measured PIPs (mass, center of mass, moment of inertia) from ten prostheses were used.
  • Hip and knee joint kinetics were calculated, and confidence bounds and sensitivity analyses were performed over a gait cycle.

Main Results:

  • Prosthetic inertial parameters (PIPs) exerted a greater influence on joint kinetics during the swing phase compared to the stance phase.
  • For example, the confidence bound size for hip flexion/extension moment was larger during swing (11.4 N·m) than stance (5.6 N·m).
  • Shank mass was identified as the most sensitive parameter affecting joint kinetics in both stance and swing phases.

Conclusions:

  • Accurate measurement of prosthetic shank mass is essential for precise joint kinetic calculations using ID in TTA individuals.
  • This finding is particularly relevant for passive prostheses with total contact carbon fiber sockets and dynamic elastic response feet during walking analysis.