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Evaluation of ankle instability using the Biodex Stability System.

C Testerman¹, R Vander Griend

¹Knoxville Orthopaedic Clinic, TN 37909, USA.

Foot & Ankle International

|June 3, 1999

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The Biodex Stability System may objectively measure ankle proprioception. This system showed injured ankles had more difficulty balancing on an unstable platform, suggesting a link to functional lateral instability.

Area of Science:

Orthopedics
Sports Medicine
Rehabilitation Science

Background:

Chronic ankle instability affects proprioception and functional performance.
Objective measures are needed to assess proprioceptive deficits in ankle injuries.

Purpose of the Study:

To evaluate the Biodex Stability System's utility in objectively measuring proprioceptive function in patients with chronic unilateral functional lateral ankle instability.

Main Methods:

Ten patients with chronic unilateral functional lateral ankle instability were assessed.
The Biodex Stability System, a multiaxial testing platform, was used to measure single-limb stance balance.
Stability index was electronically generated and compared between injured and uninjured ankles at two platform stability levels.

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Main Results:

Ankle instability was confirmed in all patients via stress radiographs.
With the platform in its most stable configuration, minimal differences were observed between ankles.
With increased platform instability (20 degrees tilt), 60% of patients exhibited higher stability index values with their injured ankle.

Conclusions:

The Biodex Stability System shows potential as an objective tool for assessing ankle proprioceptive function.
This system may help quantify deficits associated with functional lateral ankle instability.
Further research is warranted to validate these preliminary findings.