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A Hip joint kinematics driven model for the generation of realistic thigh soft tissue artefacts

Camomilla, Valentina and Cereatti, Andrea and Chèze, Laurence and Cappozzo, Aurelio (2013) A Hip joint kinematics driven model for the generation of realistic thigh soft tissue artefacts. Journal of biomechanics, Vol. 46 (3), p. 625-630. eISSN 1873-2380. Article.

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DOI: 10.1016/j.jbiomech.2012.09.018

Abstract

In human movement analysis, accuracy and robustness of the algorithms used to determine the location of centres of rotation from stereophotogrametric data depend mainly on their capacity to deal with the artefacts due to soft tissue deformation (STA). While evaluating these algorithms using a mathematical simulation approach, effectual realizations of STAs are needed. This study aimed at accomplishing this objective by modelling STAs, in twelve selected areas of the thigh, as a linear function of the hip angles, assuming no knee joint movement. The proposed model was calibrated and assessed using ex-vivo experiments. This entailed that only the component of the STA due to skin stretching was accounted for. Photogrammetric data of markers placed on the skin and on hip-bone and femur pins were recorded during passive flexion-extension, ab-adduction, rotation and circumduction of the hip joint. Artefact skin marker displacements were represented in a femur embedded anatomical frame. Model parameters were estimated by minimizing the least squares difference between measured and modelled STAs. The STA affecting a skin marker placed in a given thigh location of a given subject could be modelled with a high accuracy (median root mean square difference over 4 subjects×3 trials×12 markers×3 coordinates: 0.8 mm—inter quartile range 1.0 mm). This was also true for a hip joint movement different from the one used to calibrate the model. High inter-subject variability of the model parameters confirmed the subject-dependency of the phenomenon.

Item Type:Article
ID Code:8766
Status:Published
Refereed:Yes
Uncontrolled Keywords:Hip joint centre, functional method, stereophotogrammetry, soft tissue artefact, soft tissue deformation model
Subjects:Area 09 - Ingegneria industriale e dell'informazione > ING-INF/06 Bioingegneria elettronica e informatica
Divisions:001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Scienze Politiche, Scienze della Comunicazione e Ingegneria dell'Informazione
Publisher:Elsevier
eISSN:1873-2380
Copyright Holders:© 2012 Elsevier Ltd.
Deposited On:06 Mar 2013 10:14

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