What is the influence of using generic material properties on the estimation of the pelvis sagging when sitting from a Finite Element model of the buttock region?
Communication sans acte
Date
2018Résumé
Ischial pressure sores are painful, slow healing wounds that develop during prolonged sitting. Its formation is associated with the high internal strains induced by the compression of the soft tissues under the ischium [1]. 3D Finite Element (FE) models have been developed to estimate internal strains in the subdermal soft tissues. Some authors have also investigated the influence of the material properties of the soft tissues [2]. However, the interval of variation of the parameters in these sensitivity studies are not necessarily representative of the variability of subgroups of population. In this contribution, we investigate the influence of using the material properties of one given individual (generic material properties) as representative of a population. The generic material properties were obtained by Finite Element Updating to fit the experimental sagging of the pelvis of one subject when sitting. The 3D subject-specific FE model was generated from the combination of bi-planar Radiography, ultrasound imaging and optical scanner and is composed of the pelvis (rigid body) and 3 homogeneous layers representing the muscle tissue, fat and skin. The adipose tissue and the muscle layer were modelled as an Ogden quasi-incompressible hyperelastic material. The same material parameters were used to estimate the pelvis sagging of 7 healthy subjects. The estimated sagging was compared to the experimental one measured by computing the vertical displacements of both ischial tuberosities visible on the radiographs before and after sitting (Figure 1). For 5 subjects, the differences between both were below 1mm. For the two other subjects, the differences were 4 and 6 mm. These findings suggest that using generic material properties allow to reproduce the biomechanical response of the buttock when sitting for healthy subjects. The same approach could be applied to spinal cord injury population, which will allow to clarify the necessity of personalizing the material properties in models developed for this population.
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Communication sans acteIschial pressure sores are painful, slow healing wounds that develop during prolonged sitting. Its formation is associated with the high internal strains induced by the compression of the soft tissues under the ischium ...
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Article dans une revue avec comité de lectureMACRON, Aurélien; DORIDAM, Jennifer; VERNEY, Alexandre; ROHAN, Pierre-Yves; PILLET, Helene (Elsevier, 2018)The occurrence and management of Pressure Ulcers remain a major issue for patients with reduced mobility and neurosensory loss despite significant improvement in the prevention methods. These injuries are caused by biological ...
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Article dans une revue avec comité de lectureMACRON, Aurélien; DORIDAM, Jennifer; RIVALS, Isabelle; SADEGHINIA, Mohammad Javad; VERNEY, Alexandre; ROHAN, Pierre-Yves; PILLET, Helene (Elsevier, 2020)Internal soft tissue strains have been shown to be one of the main factors responsible for the onset of Pressure Ulcers and to be representative of its risk of development. However, the estimation of this parameter using ...
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Article dans une revue avec comité de lectureDORIDAM, Jennifer; MACRON, Aurélien; VERNEY, A.; ROHAN, Pierre-Yves; PILLET, Helene; VERGARI, Claudio (Elsevier, 2018)Pressure Ulcer (PU) prevention remains a main public health issue. The physio-pathology of this injury is not fully understood, and a satisfactory therapy is currently not available. Recently, several works suggested that ...
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Article dans une revue avec comité de lectureFOUGERON, Nolwenn; MACRON, Aurélien; TRAVERT, Christophe; SKALLI, Wafa; ROHAN, Pierre-Yves; PILLET, Helene (Taylor & Francis, 2018)Several Finite Element (FE) models of the pelvis have been developed to comprehensively assess the onset of pathologies and for clinical and industrial applications. However, because of the difficulties associated with the ...