Sphericity related contact mechanics in ceramic-on-ceramic hip joint replacements

Leyen, S.; Köbel, S.; Weber, Wolfram

doi:10.1016/s0021-9290(06)85176-6

Cited by 2 publications

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Quesada et al [15] and Udofia et al [16] investigated the contact mechanics of MOM hipresurfacing prostheses. The contact mechanics of COC THR was conducted by Leyen et al [17] and Mak and Jin [18]. However, all of these studies were only carried out under static or quasi-static conditions rather than a dynamic state.…”

Section: Introductionmentioning

confidence: 99%

Coupling of dynamics and contact mechanics of artificial hip joints in a pendulum model

Liu

Ellison

et al. 2010

Proc Inst Mech Eng H

View full text Add to dashboard Cite

To date, fully coupled dynamics and contact mechanics analysis is still limited by expensive computational cost and long computing time and has not been addressed comprehensively, particularly in the hip joint. To understand the influence of different parameters on the biomechanics of the total hip replacement (THR) and improve its design, two numerical approaches were developed and implemented in finite element models to investigate the coupling between the dynamics response and the contact mechanics for three different THR configurations, metal-on-polyethylene (MOP), metal-on-metal (MOM), and ceramic-on-ceramic (COC). The dynamic force and the contact pressure distribution at the bearing surfaces from the two methods were predicted and compared. The influences of various parameters (motion angle, load applied in the pendulum, friction coefficient, geometry, and material properties) were subsequently investigated. From the comparisons, the decoupled method, based on the rigid-body dynamics and the quasi-static elastic contact mechanics, was adequate to predict the performance of the THRs efficiently. The load had the greatest influence on the dynamics/contact mechanics among other factors.

show abstract

Section: Introductionmentioning

confidence: 99%

Coupling of dynamics and contact mechanics of artificial hip joints in a pendulum model

Liu

Ellison

et al. 2010

Proc Inst Mech Eng H

View full text Add to dashboard Cite

show abstract

Nonsphericity of Bearing Geometry and Lubrication in Hip Joint Implants

Wang

Zhao

Quiñonez

et al. 2009

Journal of Tribology

View full text Add to dashboard Cite

A general elastohydrodynamic lubrication model was developed to consider the nonsphericity of the bearing geometry in hip joint implants, both under the steady and transient conditions. The articulation between the femoral head and the acetabular cup was represented by a nominal ball-in-socket configuration. The nonsphericity was introduced on the acetabular cup and femoral head bearing surfaces in the form of an ellipsoidal surface represented by variations of the radii of curvature given by the three semi-axis lengths of the ellipsoid with regard to a nominal spherical surface. An appropriate spherical coordinate system and solution domain discretization were used to facilitate the numerical simulations. Both the equivalent discrete spherical convolution model and the corresponding spherical fast Fourier transform technique were used to evaluate the elastic deformation of either the spherical or nonspherical bearing surfaces. A fixed-tracked method was also developed to simulate the complex morphology introduced by moving the interface of the nonspherical bearing surfaces. The general methodology for the nonspherical bearing was first applied to investigate the steady-state elastohydrodynamic lubrication of an ellipsoidal cup articulating against a spherical head in a typical metal-on-metal hip joint implant. Subsequently, the problem of an ellipsoidal head articulating against a spherical cup was considered under the transient conditions. The significance of nonsphericity of bearing geometry in hip joint implants due to manufacturing, designing, and wear was discussed. The results obtained showed that the effect of a nonspherical bearing surface geometry on elastohydrodynamic lubrication was dependent on the orientation, the magnitude, and the deviation direction of the nonsphericity. A well-controlled nonsphericity was seen to be beneficial for improving the lubrication.

show abstract

Sphericity related contact mechanics in ceramic-on-ceramic hip joint replacements

Cited by 2 publications

References 0 publications

Coupling of dynamics and contact mechanics of artificial hip joints in a pendulum model

Coupling of dynamics and contact mechanics of artificial hip joints in a pendulum model

Nonsphericity of Bearing Geometry and Lubrication in Hip Joint Implants

Contact Info

Product

Resources

About