title: Effect of simplifications of bone and components inclination on the elastohydrodynamic lubrication modeling of metal-on-metal hip resurfacing prosthesis.
abstract: It is important to study the lubrication mechanism of metal-on-metal hip resurfacing prosthesis in order to understand its overall tribological performance, thereby minimize the wear particles. Previous elastohydrodynamic lubrication studies of metal-on-metal hip resurfacing prosthesis neglected the effects of the orientations of the cup and head. Simplified pelvic and femoral bone models were also adopted for the previous studies. These simplifications may lead to unrealistic predictions. For the first time, an elastohydrodynamic lubrication model was developed and solved for a full metal-on-metal hip resurfacing arthroplasty. The effects of the orientations of components and the realistic bones on the lubrication performance of metal-on-metal hip resurfacing prosthesis were investigated by comparing the full model with simplified models. It was found that the orientation of the head played a very important role in the prediction of pressure distributions and film profiles of the metal-on-metal hip resurfacing prosthesis. The inclination of the hemispherical cup up to 45° had no appreciable effect on the lubrication performance of the metal-on-metal hip resurfacing prosthesis. Moreover, the combined effect of material properties and structures of bones was negligible. Future studies should focus on higher inclination angles, smaller coverage angle and microseparation related to the occurrences of edge loading.
authors: Institute of Medical and Biological Engineering, School of Mechanical Engineering, University of Leeds, Leeds, UK.
authors: Qingen
authors: Q
authors: Meng
authors: Feng
authors: F
authors: Liu
authors: John
authors: J
authors: Fisher
authors: Zhongmin
authors: Z
authors: Jin
mesh_terms: D000077:Acetabulum / Q000737:chemistry / Q000502:physiology* / Q000601:surgery; D003198:Computer Simulation; D017076:Computer-Aided Design; D055119:Elastic Modulus / Q000502:physiology; D019544:Equipment Failure Analysis; D005269:Femur / Q000737:chemistry / Q000502:physiology* / Q000601:surgery; D017276:Friction / Q000502:physiology; D006622:Hip Prosthesis; D006801:Humans; D057446:Hydrodynamics; D008153:Lubrication / Q000379:methods; D008670:Metals / Q000737:chemistry*; D008954:Models, Biological; D011474:Prosthesis Design; D013499:Surface Properties; D013718:Tensile Strength / Q000502:physiology
chemical_list: D008670:Metals
keywords: Hip resurfacing arthroplasty; bone; lubrication analysis; metal on metal; orientations of cup and head