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JOURNAL
OF
SPORTS SCIENCE &
MEDICINE
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Research
article
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POSITION-SPECIFIC DEFICIT OF JOINT POSITION SENSE IN ANKLES WITH CHRONIC FUNCTIONAL INSTABILITY |
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Shigeki Yokoyama1  ,
Nobuou Matsusaka2, Kazuyoshi Gamada3, Makoto Ozaki1
and Hiroyuki Shindo1 |
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1Department of Orthopaedic Surgery, Graduate School of Medicine, Nagasaki University, Nagasaki, Japan 2Department of Health Sciences, Graduate School of Biomedical Sciences, Nagasaki University, Nagasaki, Japan, 3Department of Physical Therapy, Faculty of Health Sciences, Hiroshima international University, Hiroshima, Japan |
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© Journal of Sports Science and Medicine (2008) 7, 480 - 485 Search Google Scholar for Citing Articles |
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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. |
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