Table of Contents
Journal of Computational Medicine
Volume 2015, Article ID 945379, 9 pages
http://dx.doi.org/10.1155/2015/945379
Research Article

A Hertzian Integrated Contact Model of the Total Knee Replacement Implant for the Estimation of Joint Contact Forces

Sorbonne Universités, Université de Technologie de Compiègne, CNRS, UMR 7338 Biomécanique et Bioingénierie, Centre de Recherche Royallieu, CS 60 319, 60 203 Compiègne, France

Received 26 August 2015; Revised 17 September 2015; Accepted 29 September 2015

Academic Editor: Darryl D. D’Lima

Copyright © 2015 Tien Tuan Dao and Philippe Pouletaut. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The prediction of lower limb muscle and contact forces may provide useful knowledge to assist the clinicians in the diagnosis as well as in the development of appropriate treatment for musculoskeletal disorders. Research studies have commonly estimated joint contact forces using model-based muscle force estimation due to the lack of a reliable contact model and material properties. The objective of this present study was to develop a Hertzian integrated contact model. Then, in vivo elastic properties of the Total Knee Replacement (TKR) implant were identified using in vivo contact forces leading to providing reliable material properties for modeling purposes. First, a patient specific rigid musculoskeletal model was built. Second, a STL-based implant model was designed to compute the contact area evolutions during gait motions. Finally, a Hertzian integrated contact model was defined for the in vivo identification of elastic properties (Young’s modulus and Poisson coefficient) of the instrumented TKR implant. Our study showed a potential use of a new approach to predict the contact forces without knowledge of muscle forces. Thus, the outcomes may lead to accurate and reliable prediction of human joint contact forces for new case study.