PRECISION AND REPEATABILITY ANALYSIS OF OPTOTRAK CERTUS AS A TOOL FOR GAIT ANALYSIS

This study introduces a new method of determining precision and repeatability of Optotrak Certus, a tool for gait analysis using a three dimensional (3d) robot. Using 3d robot as a reference of standard, the accuracy and precision of the system in terms of angle and distance were quantitated. Angle and distance among markers showed good agreement between measurements, and comparable measures of precision were reported. Experimental results containing CMC, CV and SD values for variation of angle, volume, circular movement and speed demonstrated, provided a measure of precision and repeatability; hence the repeatability was satisfactory. The investigation is ethical and practical in measurement analysis.