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Three-dimensional computer model of the human buttocks, in vivo
1University of Alabama, Tuscaloosa 35487-0278.
Journal of Rehabilitation Research and Development
|January 1, 1994
Summary
This study used finite element analysis to assess wheelchair cushion pressure on the body. Results quantified interface stress, aiding in the design of pressure-reducing cushions for preventing decubitus ulcers.
Area of Science:
- Biomedical Engineering
- Biomechanics
- Rehabilitation Engineering
Background:
- Decubitus ulcers are a significant risk for wheelchair users.
- Current cushion design focuses on minimizing buttock-cushion interface pressure.
- Understanding tissue stress distribution is crucial for effective cushion design.
Purpose of the Study:
- To utilize finite element analysis (FEA) to model stress distribution in soft tissues.
- To quantify interface pressure and stress at the buttock-cushion interface.
- To inform the design of improved wheelchair cushions for pressure ulcer prevention.
Main Methods:
- Generation of linear three-dimensional finite element models of perituberosity tissues.
- Utilizing infinitesimal deflection theory for model analysis.
- Experimental validation using magnetic resonance imaging (MRI) and interface pressure measurements.
Main Results:
- FEA models predicted minimal principal stresses at the buttock-cushion interface.
- Calculated stresses were 17 kPa for male and 15 kPa for female subjects.
- Computational findings were corroborated by experimental data.
Conclusions:
- Finite element analysis provides valuable insights into tissue stress under seating pressure.
- FEA can guide the development of advanced wheelchair cushions.
- This approach aids in reducing the incidence of decubitus ulcers in wheelchair users.