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[Inertial effects on interface pressure between prosthetic socket and residual limb].

Xiaohong Jia1, Ming Zhang, Rencheng Wang

  • 1Division of Intelligent and Biomechanical System, State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China. jiaxh@mail.tsinghua.edu.cn

Sheng Wu Yi Xue Gong Cheng Xue Za Zhi = Journal of Biomedical Engineering = Shengwu Yixue Gongchengxue Zazhi
|July 15, 2005
PubMed
Summary

This study developed a 3D nonlinear finite element model to analyze prosthetic socket interface pressures. Inertial loads significantly impact pressure distribution, especially during the swing phase of walking.

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Area of Science:

  • Biomechanics
  • Biomedical Engineering
  • Prosthetics and Orthotics

Background:

  • Optimal prosthetic socket design requires understanding interface pressure distribution.
  • Traditional finite element (FE) models often lack dynamic considerations.

Purpose of the Study:

  • To develop a 3D nonlinear FE model for predicting residual limb interface pressures.
  • To quantitatively assess the effect of inertial loads on interface pressure distribution.

Main Methods:

  • A 3D nonlinear finite element model was created using data from a transtibial amputee.
  • Interface pressures were predicted, and the influence of inertial loads was analyzed.

Main Results:

  • Interface pressures were highest around the patella tendon, lateral and medial tibia, and popliteal depression.
  • Inertial loads caused an average 8.4% difference in interface pressure during the stance phase.
  • Inertial loads caused up to a 20.1% difference in interface pressure during the swing phase, with altered trends.

Conclusions:

  • Inertial effects are crucial and cannot be disregarded in walking simulations for prosthetic socket design.
  • Dynamic analysis enhances the accuracy of prosthetic interface pressure predictions.