Biodex Balance System

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Top Contributors - Heba El Saeid, Lucinda hampton and Angeliki Chorti  

Introduction

In recent years, the Biodex Balance System (BBS) has been used to evaluate postural balance. The BBS is a multiaxial device that objectively measures and records an individual’s ability to stabilize the involved joint under dynamic stress. It uses a circular platform that is free to move in the anterior-posterior and medial-lateral axes simultaneously. it can also be used for the purpose of balance training.

Method of use

The BBS allows up to 20° of foot platform tilt, which permits the ankle joint mechanoreceptors to be stimulated maximally. The BBS measures, in degrees, the tilt about each axis during dynamic conditions and calculates a medial-lateral stability index (MLSI), anterior-posterior stability index (APSI), and an overall stability index (OSI). These indexes represent fluctuations around a zero point established prior to testing when the platform is stable. For example, an OSI of 5° would be interpreted to mean that on average, the displacement from the center is 5°. A high score in the for example, OSI, indicates poor balance. The OSI score is believed to be the best indicator of the overall ability of the patient to balance the platform. The stability of the platform can be varied by adjusting the level of resistance given by the springs under the platform. The platform stability ranges from 1–8, with 1 representing the greatest instability. The lower the resistance level the less stable the platform.

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