Med Biol Eng Comput - Kinematic description of soft tissue artifacts: quantifying rigid versus deformation components and their relation with bone motion.

Tópicos

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Resumo

This paper proposes a kinematic approach for describing soft tissue artifacts (STA) in human movement analysis. Artifacts are represented as the field of relative displacements of markers with respect to the bone. This field has two components: deformation component (symmetric field) and rigid motion (skew-symmetric field). Only the skew-symmetric component propagates as an error to the joint variables, whereas the deformation component is filtered in the kinematic analysis process. Finally, a simple technique is proposed for analyzing the sources of variability to determine which part of the artifact may be modeled as an effect of the motion, and which part is due to other sources. This method has been applied to the analysis of the shank movement induced by vertical vibration in 10 subjects. The results show that the cluster deformation is very small with respect to the rigid component. Moreover, both components show a strong relationship with the movement of the tibia. These results suggest that artifacts can be modeled effectively as a systematic relative rigid movement of the marker cluster with respect to the underlying bone. This may be useful for assessing the potential effectiveness of the usual strategies for compensating for STA.

Resumo Limpo

paper propos kinemat approach describ soft tissu artifact sta human movement analysi artifact repres field relat displac marker respect bone field two compon deform compon symmetr field rigid motion skewsymmetr field skewsymmetr compon propag error joint variabl wherea deform compon filter kinemat analysi process final simpl techniqu propos analyz sourc variabl determin part artifact may model effect motion part due sourc method appli analysi shank movement induc vertic vibrat subject result show cluster deform small respect rigid compon moreov compon show strong relationship movement tibia result suggest artifact can model effect systemat relat rigid movement marker cluster respect under bone may use assess potenti effect usual strategi compens sta

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