Elastohydrodynamic lubrication and wear modelling of the knee joint replacements with surface topography

Biosurface and Biotribology

Leiming Gao¹  Robert Hewson¹  Michael Skipper Andersen²  Zikai Hua³  Zhongmin Jin⁴ 

[1] Department of Aeronautics, Imperial College London;Department of Materials and Production, Aalborg University;School of Mechatronics Engineering and Automation, Shanghai University;Southwest Jiaotong University;

关键词: orthopaedics;    biomechanics;    mechanical contact;    wear;    friction;    lubrication;    lubricants;    hardness;    surface texture;    prosthetics;    surface roughness;    biomedical materials;    steady-state wear;    surface topography;    surface texturing techniques;    wear reduction;    elastohydrodynamic lubrication;    knee joint replacements;    lubricated total knee replacements;    wear model;    metal-on-polyethylene total knee replacement;    medial knee compartments;    lateral knee compartments;    adapted Archard wear;    wear factor;    soft bearing surface;   

DOI  :  10.1049/bsbt.2017.0003

来源: DOAJ

【 摘 要 】

This numerical study predicted wear of lubricated total knee replacements with the existing of textured surface and the possibility of surface designs to reduce wear. In the first part, a wear model of metal-on-polyethylene total knee replacement was developed. The medial and lateral knee compartments was accounted for separately, with the contact force and motion during walking cycles applied. An adapted Archard wear formula was employed where the wear factor was an exponential function of the ‘Lambda ratio’ (film thickness to the average roughness). Wear of the soft bearing surface (polyethylene insert) was simulated with regularly geometry update until a steady-state wear observed. In the second part, the effect of surface topography of the knee replacements was investigated. The surface texturing techniques have shown promising benefit to machine components in many areas of engineering practice. The texture parameters were designed using the Taguchi method for the geometry, size, and distribution of the micro dimples. It was observed that the lateral compartment may benefit from surface texturing if dimples were properly designed, while the texturing showed hardly advantageous effect on the medial surface in terms of lubrication enhancement and wear reduction. Some results were presented in the 6th World Tribology Conference.

【 授权许可】

Unknown