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Related Concept Videos

Ankle Joint01:10

Ankle Joint

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The ankle is formed by the talocrural joint (crural = leg). It consists of the articulations between the talus bone of the foot and the distal ends of the tibia and fibula of the leg. The superior aspect of the talus bone is square-shaped and has three areas of articulation. The top of the talus articulates with the inferior tibia. This is the portion of the ankle joint that carries the body weight between the leg and foot. The sides of the talus are firmly held in position by the articulations...
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Deformable link segment analysis for prosthetic foot-ankle components: Kinematics.

Stacey R Zhao1, J Timothy Bryant1, Qingguo Li2

  • 1Mechanical and Materials Engineering, Queen's University, Kingston, Canada; Human Mobility Research Centre, Queen's University and Kingston Health Sciences Centre, Kingston, Canada.

Journal of Biomechanics
|December 25, 2019
PubMed
Summary
This summary is machine-generated.

A new deformable link segment (DLS) analysis estimates prosthetic foot-ankle deformation velocity without needing angular velocity approximations. This method improves accuracy in calculating prosthetic power and energy performance.

Keywords:
Angular velocityDeformation velocityGaitMechanical powerProsthetic feet

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Area of Science:

  • Biomechanics
  • Prosthetics Engineering
  • Gait Analysis

Background:

  • Estimating prosthetic foot-ankle power traditionally relies on segment deformation velocity, which requires approximating angular velocity.
  • Existing methods face limitations in isolating prosthetic foot-ankle performance due to uncertainties in defining the angular velocity of deformable segments.

Purpose of the Study:

  • To introduce a novel Deformable Link Segment (DLS) analysis for estimating segment deformation velocity without prior angular velocity approximation.
  • To enable simultaneous solving of deformation and angular velocities during the stance phase of gait.
  • To facilitate separate modeling of deformable prosthetic foot-ankle components.

Main Methods:

  • Proposed a Deformable Link Segment (DLS) analysis.
  • Compared DLS analysis with the distal foot (DF) model and unified deformable (UD) segment model.
  • Evaluated the methods during over-ground walking in three trans-tibial prosthesis users.

Main Results:

  • DLS analysis estimates deformation velocity without first approximating angular velocity.
  • DLS and UD segment estimates of deformation velocity were comparable when applied to the UD segment.
  • DLS analysis allows for independent modeling of deformable prosthetic foot-ankle components.

Conclusions:

  • The proposed DLS analysis offers a rigorous approach to estimating angular and deformation velocities of passive prosthetic foot-ankle components.
  • This method allows for accurate calculation of deformation power and energy performance.
  • DLS analysis enhances the ability to isolate and evaluate the performance of prosthetic foot-ankle mechanisms.