title: Experimental validation of finite element modelling of a modular metal-on-polyethylene total hip replacement.
abstract: Finite element models are becoming increasingly useful tools to conduct parametric analysis, design optimisation and pre-clinical testing for hip joint replacements. However, the verification of the finite element model is critically important. The purposes of this study were to develop a three-dimensional anatomic finite element model for a modular metal-on-polyethylene total hip replacement for predicting its contact mechanics and to conduct experimental validation for a simple finite element model which was simplified from the anatomic finite element model. An anatomic modular metal-on-polyethylene total hip replacement model (anatomic model) was first developed and then simplified with reasonable accuracy to a simple modular total hip replacement model (simplified model) for validation. The contact areas on the articulating surface of three polyethylene liners of modular metal-on-polyethylene total hip replacement bearings with different clearances were measured experimentally in the Leeds ProSim hip joint simulator under a series of loading conditions and different cup inclination angles. The contact areas predicted from the simplified model were then compared with that measured experimentally under the same conditions. The results showed that the simplification made for the anatomic model did not change the predictions of contact mechanics of the modular metal-on-polyethylene total hip replacement substantially (less than 12% for contact stresses and contact areas). Good agreements of contact areas between the finite element predictions from the simplified model and experimental measurements were obtained, with maximum difference of 14% across all conditions considered. This indicated that the simplification and assumptions made in the anatomic model were reasonable and the finite element predictions from the simplified model were valid.
authors: Institute of Medical and Biological Engineering, School of Mechanical Engineering, University of Leeds, Leeds, UK x.hua@leeds.ac.uk xijinhua@outlook.com.
authors: Xijin
authors: X
authors: Hua
authors: State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an, Shanxi, China.
authors: Ling
authors: L
authors: Wang
authors: Institute of Medical and Biological Engineering, School of Mechanical Engineering, University of Leeds, Leeds, UK.
authors: Mazen
authors: M
authors: Al-Hajjar
authors: Institute of Medical and Biological Engineering, School of Mechanical Engineering, University of Leeds, Leeds, UK State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an, Shanxi, China.
authors: Zhongmin
authors: Z
authors: Jin
authors: Institute of Medical and Biological Engineering, School of Mechanical Engineering, University of Leeds, Leeds, UK.
authors: Ruth K
authors: RK
authors: Wilcox
authors: Institute of Medical and Biological Engineering, School of Mechanical Engineering, University of Leeds, Leeds, UK.
authors: John
authors: J
authors: Fisher
mesh_terms: D003198:Computer Simulation; D019544:Equipment Failure Analysis; D020342:Finite Element Analysis; D017276:Friction; D006622:Hip Prosthesis; D008670:Metals / Q000737:chemistry*; D008962:Models, Theoretical; D020959:Polyethylene / Q000737:chemistry*; D011474:Prosthesis Design; D013314:Stress, Mechanical; D013499:Surface Properties
chemical_list: D008670:Metals; D020959:Polyethylene
keywords: Total hip replacement; contact mechanics; experimental validation; finite element; metal-on-polyethylene