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Kinematic description of soft tissue artifacts: quantifying rigid versus deformation components and their relation with bone motion

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Abstract

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.

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Acknowledgments

This work has been funded by the Spanish Government and co-financed by EU FEDER funds (Grants DPI2009-13830-C02-01, DPI2009-13830-C02-02 and IMPIVA IMDEEA/2012/79 and IMDEEA/2012/80).

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Correspondence to Alvaro Page.

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de Rosario, H., Page, A., Besa, A. et al. Kinematic description of soft tissue artifacts: quantifying rigid versus deformation components and their relation with bone motion. Med Biol Eng Comput 50, 1173–1181 (2012). https://doi.org/10.1007/s11517-012-0978-5

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  • DOI: https://doi.org/10.1007/s11517-012-0978-5

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