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Load transfer mechanics between trans-tibial prosthetic socket and residual limb--dynamic effects
Xiaohong Jia1, Ming Zhang, Winson C C Lee
1Jockey Club Rehabilitation Engineering Center, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China.
Journal of Biomechanics
|July 28, 2004
Summary
Inertial loads significantly impact residual limb and prosthetic socket interface stresses during walking. Accounting for material inertia in finite element models is crucial for accurate mechanical analysis.
Area of Science:
- Biomechanics
- Biomedical Engineering
- Orthopedics
Background:
- Trans-tibial prosthetics require understanding residual limb-socket interaction.
- Interface stresses are critical for prosthetic comfort and function.
Purpose of the Study:
- To investigate the effects of inertial loads on interface stresses.
- To compare stress predictions with and without material inertia consideration.
Main Methods:
- Vicon motion analysis and force platform measurements.
- 3D nonlinear finite element (FE) modeling of residual limb and socket.
- Simulation of friction/slip boundary conditions using surface-to-surface contact.
Main Results:
- Interface pressure and shear stress showed similar double-peaked waveforms during the stance phase.
- Average differences in interface stresses were 8.4% (stance) and 20.1% (swing) when including inertial forces.
- Maximum stress difference reached 19% during the stance phase.
Conclusions:
- Material inertia significantly affects interface stresses between the residual limb and prosthetic socket.
- FE models should incorporate material inertia for accurate dynamic analysis of prosthetic use.