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Ankle Mechanics in Sidestep Cutting Highlight the Need for 2-Degrees of Freedom Powered Ankle-Foot Prostheses

This study explores the ankle mechanics during sidestep cutting and its implications for designing prostheses with 2-degrees of freedom in order to improve agility in gait for patients with limb loss.

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Ankle Mechanics in Sidestep Cutting Highlight the Need for 2-Degrees of Freedom Powered Ankle-Foot Prostheses

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  1. Ankle mechanics during sidestep cutting implicates need for 2-degrees of freedom powered ankle-foot prostheses Evandro M. Ficanha; Mohammad Rastgaar, PhD; Kenton R. Kaufman, PhD

  2. Aim • Consider requirements of turning in prosthesis design to increase agility. • Relevance • Ankle joint of currently available powered prostheses can control 1 degree of freedom (DOF), focusing on improved mobility in sagittal plane.

  3. Method • Studied ankle kinematics and kinetics during sidestep cutting and straight walking.

  4. Results • Sidestep cutting vs straight walking: • No significant differences between ankle sagittal plane mechanics. • Significant differences in ankle frontal plane mechanics. • Inversion-eversion (IE) angles smaller during straight walking. • IE kinematic changes were most significant during sidestep cutting. • Moments of step that initiated sidestep cutting were always in eversion.

  5. Conclusion • Ankle-foot prosthesis with active DOFs in sagittal and frontal planes will increase agility of gait for patients with limb loss.

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