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Design of monolimb using finite element modelling and statistics-based Taguchi method
1Jockey Club Rehabilitation Engineering Centre, The Hong Kong Polytechnic University, Hong Kong, PR China.
Clinical Biomechanics (Bristol, Avon)
|June 21, 2005
Summary
This study optimized transtibial prosthesis (monolimb) design using finite element analysis and the Taguchi method. The anteroposterior shank dimension is key for balancing flexibility and structural integrity in monolimb prostheses.
Area of Science:
- Biomechanics
- Prosthetics Engineering
- Materials Science
Background:
- Monolimb is a one-piece thermoplastic transtibial prosthesis.
- Its shank can simulate ankle motion through controlled deflection.
- Design lacks clear guidance on balancing shank flexibility and structural integrity.
Purpose of the Study:
- To optimize the structural design of monolimb transtibial prostheses.
- To identify key design factors influencing shank flexibility and structural integrity.
- To establish design criteria for improved prosthesis performance.
Main Methods:
- Finite element analysis (FEA) simulated structural tests (ISO10328).
- Taguchi method identified significant design factors (thickness, dimensions, seam depth).
- FEA model was validated through experimental structural testing.
Main Results:
- Anteroposterior shank dimension most significantly impacts stress, deformation, and dorsiflexion.
- Seam line depth had minimal influence compared to other factors.
- An optimized monolimb configuration meeting design requirements was proposed.
Conclusions:
- FEA combined with the Taguchi method is effective for prosthesis structural design optimization.
- Understanding factor importance facilitates future prosthetic design.
- Further research requires gait analysis of amputees using the optimized monolimb.