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Asynchrony between subtalar and knee joint function during running.

N Stergiou1, B T Bates, S L James

  • 1School of Health, Physical Education and Recreation, University of Nebraska at Omaha, 68182-0216, USA. Nick_Stergiou@unomaha.edu

Medicine and Science in Sports and Exercise
|December 10, 1999
PubMed
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Running coordination between subtalar pronation/supination and knee flexion/extension is key to reducing impact forces. Poor coordination may lead to injuries, and this study explores that link.

Area of Science:

  • Biomechanics
  • Sports Medicine
  • Running Injury Prevention

Background:

  • Proper coordination of subtalar joint pronation/supination and knee joint flexion/extension is crucial for attenuating ground reaction impact forces (GRIF) during running.
  • A lack of this coordination may contribute to various running-related injuries over time.

Purpose of the Study:

  • To investigate the relationship between subtalar joint motion and knee joint motion.
  • To determine how this coordination impacts ground reaction impact forces (GRIF) during distance running.

Main Methods:

  • Eight subjects ran at varying speeds and over different obstacle heights.
  • Kinematic data (sagittal, rear-view) and ground reaction impact forces (GRIF) were collected.
  • Biomechanical data were compared with clinical evaluations.

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Main Results:

  • Increased running speed and obstacle height led to higher GRIF and greater velocity differences between the subtalar and knee joints.
  • A shift from unimodal to bimodal rearfoot angle curves was observed, linked to tibial deviation.
  • Velocity differences between subtalar and knee joint actions correlated strongly with clinical evaluations.

Conclusions:

  • A lack of coordination between subtalar and knee joint actions may be a mechanism underlying running injuries.
  • This coordination deficit shows potential for predicting injury susceptibility in runners.