Using of three dimensional motion analysis for evaluation of equilibrium function

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It is difficult to detect the disability in activities of daily living (ADL) in patients with unilateral vestibular disorders using the current methods. The purpose of this research was to make it possible detecting patients' disabilities in ADL by 3-dimensional motion analysis. In this research, we focused on the standing posture with two kinds of manner and stepping motion in the patients with unilateral vestibular disorders and healthy subjects.Small reflective markers were attached on the right and left sides of subjects' head, shoulder and trochanter. The performance was recorded with two CCD cameras. The position of the marker was detected using computer. Healthy subjects and patients were instructed to do three kinds of performances as follows. Condition 1: standing with putting one foot in front of the other for 30 seconds with the eyes closed Condition 2: standing on one foot with the eyes closed for 30 seconds Condition 3: stepping with the eyes closed for 30 secondsWe measured the rotation angle and/or deviation angle of the head, shoulder and trochanter. We could find distinct difference between patients and healthy subjects. Patients showed the remarkable correlation between head and trochanter in rotation angle and/or deviation angle in condition 1 and condition 2. Similarly, patients showed the high correlation between head and shoulder in rotation angle in condition 3. On the other hand, healthy subjects did not show the definite correlation between head and other parts of the body in all three conditions. In this study, three dimensional motion analysis was useful for detecting abnormalities in the performance of the patients with unilateral vestibular disorders.