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Experimental and computational analysis of composite ankle-foot orthosis

Experimental and computational analysis of composite ankle-foot orthosis. Dequan Zou, DSc; Tao He, MS; Michael Dailey, MBA, CO; Kirk E. Smith, BS; Matthew J. Silva, PhD; David R. Sinacore, PhD, PT; Michael J. Mueller, PhD, PT; Mary K. Hastings, DPT, MSCI. Aim

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Experimental and computational analysis of composite ankle-foot orthosis

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  1. Experimental and computational analysis of composite ankle-foot orthosis Dequan Zou, DSc; Tao He, MS; Michael Dailey, MBA, CO; Kirk E. Smith, BS; Matthew J. Silva, PhD; David R. Sinacore, PhD, PT; Michael J. Mueller, PhD, PT; Mary K. Hastings, DPT, MSCI

  2. Aim • Develop finite element analysis (FEA) models to predict mechanical behavior of ankle-foot orthoses (AFOs). • Relevance • Carbon fiber (CF) AFOs can improve gait by improving ankle plantar flexor power, joint moment, and energy efficiency. • However, CF AFO fabrication may be expensive and require multiple AFOs.

  3. Method • Fabricated 1 thermoplastic and 2 CF composite AFOs. • Mechanically tested AFOs to produce force-displacement data. • Validated FEA models by comparing model predictions with mechanical testing data performed under same loading and boundary conditions.

  4. Results • Actual mechanical testing: • Demonstrated that CF performs better than thermoplastic. • Simulation results: • Showed that FEA models produced accurate predictions for both AFO types. • Relative error of energy return ratio predicted by CF AFO FEA model is <3%.

  5. Conclusion • Highly accurate FEA models will allow orthotists to improve CF AFO fabrication without wasting time and money on trial and error fabrications that are expensive and do not consistently improve AFO and user performance.

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