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Optimal ankle axis position for articulated boots.

Dustin Bruening1, James G Richards

  • 1Department of Health, Nutrition, and Exercise Sciences, University of Delaware, USA.

Sports Biomechanics
|September 6, 2005
PubMed
Summary
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This study determined the optimal placement for articulated ski and skate boot ankle joints. Accurate placement minimizes friction and improves comfort by accommodating natural foot motion.

Area of Science:

  • Biomechanics
  • Sports Engineering

Background:

  • Articulated boots in skiing and skating offer ankle mobility and stability.
  • Current boot designs vary in articulation placement, leading to suboptimal performance.

Purpose of the Study:

  • Determine the optimal ankle articulation axis position in boots.
  • Calculate the necessary boot tongue expansion for full ankle motion range.

Main Methods:

  • Collected 3D kinematic data from 40 participants during sagittal plane ankle motion.
  • Analyzed data to predict articulation axis position and required tongue expansion based on foot length.

Main Results:

  • Horizontal articulation axis position strongly correlated with foot length (r=0.87).

Related Experiment Videos

  • Vertical axis position showed moderate correlation with foot length (r=0.49).
  • Required boot tongue expansion moderately correlated with foot length (r=0.58).

    • Conclusions:

    • Precise articulation axis placement minimizes boot-cuff friction and resistance.
    • An expandable tongue design accommodates ankle motion, reducing anterior ankle pressure and injury risk.