Soft tissue motion measurement on shank and thigh with MRI
نویسنده
چکیده
Most in vivo knee kinematic analyses are based on external markers attached to the shank and the thigh. However, the positioning of the markers and skin artifacts can affect the kinematic parameters of the bones true movement. The aim of the present study was to develop and to use a protocol and a modeling method that allows the computation of the relative motion between the bones and the markers. MRI acquisitions were performed on the right knee of eleven volunteers without knee injury. The subjects were equipped with external MRIcompatible markers and a foot drive device allowing the subjects to perform an active loaded knee extension. The bones and external markers were modeled from MRI images, a registration algorithm was applied to the bones and finally the relative motion of the thigh and shank markers with respect to their underlying bones was computed semi-automatically. As a result it has been found that the marker movement differs from the bone movement at their maxima 22 mm in translation and 15° in rotation. Soft tissue artifact; MRI; 3D movement
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