Rationalizing the In Vivo Degradation of Metal-on-Metal Artificial Hip Joints Using Tribocorrosion Concepts

A comparison is made between the lubrication mechanisms believed to occur in normal human hip joints, and artificial hip joints. A review of the literature and some new experimental data is used to highlight many of the characteristics of human joint lubrication. Specimens of artificial joints removed from patients after various periods of service were studied, and deductions made about the modes of lubrication and wear. Both metal-on-metal and metal-on-plastic joints were considered. It was concluded that human joints operated mainly by fluid film lubrication while artificial joints displayed principally boundary lubrication.

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A Mixed Elasto-Hydrodynamic Lubrication Model for Wear Calculation in Artificial Hip Joints

Lubricants ◽

10.3390/lubricants8070072 ◽

2020 ◽

Vol 8 (7) ◽

pp. 72 ◽

Cited By ~ 1

Author(s):

Alessandro Ruggiero ◽

Alessandro Sicilia

Keyword(s):

Hydrodynamic Lubrication ◽

Acetabular Cup ◽

Hip Joints ◽

Total Hip Replacements ◽

Artificial Hip ◽

Hip Replacements ◽

Volume Wear ◽

Wear Calculation ◽

Artificial Hip Joints

The aim of this paper was to propose a novel in silico mixed elasto-hydrodynamic lubrication model with the purpose of wear prediction in Total Hip Replacements (THRs). The model considers the progressive wear contribution in the calculation of the meatus filled by the non-Newtonian synovial fluid. The results were referred to the gait cycle kinematics, calculated by using musculoskeletal multibody software, while the loading was assumed by literature in vivo measurements. The simulations allow evaluating the fluid and the contact pressure fields and the acetabular cup wear over the time. The results were obtained considering a Ultra High Molecular Weight PolyEthylene, UHMWPE, cup and were compared with results from the literature, showing a good agreement in terms of total volume wear of the cup.

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Adjustment of wear particle size distribution . of DLC coatings for tribological metal-on-metal pairing in artificial hip joints

Materialwissenschaft und Werkstofftechnik ◽

10.1002/mawe.200800374 ◽

2009 ◽

Vol 40 (1-2) ◽

pp. 98-100 ◽

Cited By ~ 4

Author(s):

B. Stamm ◽

B. Küzün ◽

O. Filipov ◽

S. Reuter ◽

I. Erdmann ◽

...

Keyword(s):

Particle Size ◽

Particle Size Distribution ◽

Size Distribution ◽

Wear Particle ◽

Hip Joints ◽

Dlc Coatings ◽

Metal On Metal ◽

Artificial Hip ◽

Artificial Hip Joints

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Elasto-Hydrodynamic Lubrication Modelling of Spherical Metal-on-Metal Artificial Hip Joints

World Tribology Congress III, Volume 1 ◽

10.1115/wtc2005-63556 ◽

2005 ◽

Cited By ~ 1

Author(s):

F. C. Wang ◽

Z. M. Jin ◽

I. J. Udofia

Keyword(s):

Hip Joint ◽

Hydrodynamic Lubrication ◽

Hip Joints ◽

Hip Implant ◽

Metal On Metal ◽

Artificial Hip ◽

Joint Implants ◽

Artificial Hip Joints

A full numerical methodology was developed for the elasto-hydrodynamic lubrication analysis of hip joint implants for the lubrication problem in spherical and conformal contacts. Typical results of a metal-on-metal hip implant were obtained to illustrate the applicability of the numerical methodology developed in the present study.

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Friction and lubrication modelling of metal-on-metal artificial hip joints

Journal of Biomechanics ◽

10.1016/s0021-9290(06)83461-5 ◽

2006 ◽

Vol 39 ◽

pp. S139 ◽

Cited By ~ 1

Author(s):

F. Wang ◽

C. Brockett ◽

S. Williams ◽

Z. Jin ◽

J. Fisher

Keyword(s):

Hip Joints ◽

Metal On Metal ◽

Artificial Hip ◽

Artificial Hip Joints ◽

Friction And Lubrication

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Isoviscous elastohydrodynamic lubrication of circular point contacts with particular reference to metal-on-metal hip implants

Proceedings of the Institution of Mechanical Engineers Part J Journal of Engineering Tribology ◽

10.1243/135065003322445313 ◽

2003 ◽

Vol 217 (5) ◽

pp. 397-402 ◽

Cited By ~ 6

Author(s):

D Jalali- Vahid ◽

Z. M. Jin ◽

D Dowson

Keyword(s):

Numerical Solutions ◽

Elastohydrodynamic Lubrication ◽

Hip Implants ◽

Point Contacts ◽

Hip Joints ◽

Circular Point ◽

Metal On Metal ◽

Artificial Hip Joints

A full numerical analysis of elastohydrodynamic lubrication (EHL) of circular point contacts was carried out in the present study under isoviscous conditions with particular reference to metal-on-metal artificial hip joints, using a modified Newton-Raphson method. It was found to be possible to incorporate directly the physiological conditions, representative of typical metal-on-metal hip implants under in-vivo walking or in-vitro simulator testing, in the present numerical solutions. The predicted minimum and central film thicknesses were compared favourably with those estimated from various formulae available in the literature. In particular, it was shown that both the minimum and the central film thickness expressions derived by Hamrock and Dowson were reasonably accurate for all the conditions considered in the present study.

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