Journal of Sports Science and Medicine
Journal of Sports Science and Medicine
ISSN: 1303 - 2968   
Ios-APP Journal of Sports Science and Medicine
Androit-APP Journal of Sports Science and Medicine
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©Journal of Sports Science and Medicine (2008) 07, 480 - 485

Research article
Position-Specific Deficit of Joint Position Sense in Ankles with Chronic Functional Instability
Shigeki Yokoyama,1 , Nobuou Matsusaka2, Kazuyoshi Gamada3, Makoto Ozaki1, Hiroyuki Shindo1
Author Information
1 Department of Orthopaedic Surgery, Graduate School of Medicine, Nagasaki University, Nagasaki, Japan
2 Department of Health Sciences, Graduate School of Biomedical Sciences, Nagasaki University, Nagasaki, Japan
3 Department of Physical Therapy, Faculty of Health Sciences, Hiroshima international University, Hiroshima, Japan

Shigeki Yokoyama
✉ 8 Iga-machi, Takahashi-city, Okayama, 716-8508, Japan.
Email: shigekiy@kiui.ac.jp
Publish Date
Received: 28-04-2008
Accepted: 10-09-2008
Published (online): 01-12-2008
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ABSTRACT

The present study was aimed to test a hypothesis that individuals with functional ankle instability (FAI) underestimate the joint angle at greater plantarflexion and inversion. Seventeen males with unilateral FAI and 17 controls (males without FAI) consented for participation in this IRB-approved, case-control study. Using a passive reproduction test, we assessed ankle joint position sense (JPS) for test positions between 30 and -10 degrees plantarflexion with an inclement of 10 degrees with or without 20° inversion at each plantarflexion angle. The constant error (CE) was defined as the value obtained by subtracting the true angle of a test position from the corresponding perceived angle. At plantarflexed and inverted test positions, the CE values were smaller in negative with greater in the FAI group than in the control group. That is, in the FAI group, the FAI group underestimated the true plantarflexion angle at combined 30° plantarflexion and 20° inversion. We conclude that the ankle with FAI underestimate the amount of plantarflexion, which increases the chance of reaching greater planterflexion and inversion than patients' intention at high risk situations of spraining such as landing.

Key words: Functional ankle instability, lateral ankle sprain, proprioception, joint position sense, constant error


           Key Points
  • Joint position sense (JPS) of the ankle with functional ankle instability was investigated utilizing a passive reproduction test.
  • The FAI group demonstrated greater error of the joint position than the control group only when the ankle was positioned at combined inversion and plantarflexion.
  • The FAI group underestimated plantarflexion angle when the ankle was placed at combined inversion and plantarflexion.
 
 
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