The purpose of this study was to develop and evaluate a non-position fixed compact motion analysis system configured for a small measurement volume and able to zoom while tracking small round flat markers in respect to a fiducial marker which was used for the camera pose estimation. Thereby the disturbance of the measured objects through the marker tracking can be kept at minimum. A stereophotogrammetrical motion analysis system can track wireless, small, light-weight markers attached to the objects. Orthopaedic research projects focusing on small displacements in a small measurement volume require a radiation free, three dimensional motion analysis system.
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