Finite element analysis of two total knee joint prostheses

被引：26

作者：

Ingrassia T. ^{[1
]}

Nalbone L. ^{[2
]}

Nigrelli V. ^{[1
]}

Tumino D. ^{[3
]}

Ricotta V. ^{[1
]}

机构：

[1] Dipartimento di Ingegneria Chimica, Gestionale, Informatica e Meccanica, Università degli Studi di Palermo, 90128 Palermo, Viale delle Scienze

[2] Ambulatorio di Ortopedia e Traumatologia, Azienda Ospedaliera Universitaria Policlinico Paolo Giaccone di Palermo

[3] Facoltà di Ingegneria, Architettura e delle Scienze motorie, Università degli Studi di Enna Kore, 94100 Enna, Cittadella Universitaria

来源：

Int. J. Interact. Des. Manuf. | 2013年 / 2卷 / 91-101期

关键词：

Contact analysis; FEM simulation; Total knee replacement;

D O I：

10.1007/s12008-012-0167-7

中图分类号：

学科分类号：

摘要：

Aim of this work is to compare two different total knee prostheses that differ mainly in the shape of the polyethylene (PE) component inserted between the femoral and tibial plates. The best solution between them has been originally reshaped in order to reduce stress peaks. The study procedure has been divided into the following steps. First step is the digitalisation of the shape of the prostheses by means of a 3D laser scanner. The morphology of two prototypes of the prostheses has been acquired by elaborating multiple Moirè fringe patterns projected on their surfaces. Second step consisted on the manipulation of these data in a CAD module, that is the interpolation of raw data into NURBS surfaces, reducing singularities due to the typical scattering of the acquiring system. Third step has been the setting up of FEM simulations to evaluate the prostheses behaviour under benchmark loading conditions given in literature. The CAD model of the prostheses has been meshed into solid finite elements. Different flexion angles configurations have been analysed, the load being applied along the femoral axis. FEM analyses have returned stress fields in the PE insert and, in particular, in the stabilizing cam which function is to avoid dislocation. Last step has been the integrated use of CAD and FEM to modify the shape of the stabilizing cam of the best prosthesis, in order to reduce the stress peaks in the original prosthesis without affecting kinematics of the joint. Good results have been obtained both in terms of stress and contact pressure peaks reduction. © 2012 Springer-Verlag.

引用

页码：91 / 101

页数：10

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