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

2003 ◽  
Vol 217 (5) ◽  
pp. 397-402 ◽  
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.

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

CORROSION ◽  
10.5006/2514 ◽  
2017 ◽  
Vol 73 (12) ◽  
pp. 1510-1519 ◽  
Author(s):  
Shoufan Cao ◽  
Anna Igual Muñoz ◽  
Stefano Mischler
Keyword(s):  
Hip Joints ◽  
Metal On Metal ◽  
Artificial Hip ◽  
Artificial Hip Joints ◽  
In Vivo Degradation

scholarly journals Transient analysis of isothermal elastohydrodynamic circular point contacts

2001 ◽  
Vol 215 (10) ◽  
pp. 1159-1172 ◽  
Author(s):  
D Jalali Vahid ◽  
H Rahnejat ◽  
Z M Jin ◽  
D Downson
Keyword(s):  
Transient Analysis ◽  
Solution Method ◽  
Numerical Solutions ◽  
Flat Glass ◽  
Point Contact ◽  
Elastohydrodynamic Lubrication ◽  
Point Contacts ◽  
Good Qualitative Agreement ◽  
Circular Point ◽  
Good Agreement

In this paper a solution method is presented for the transient isothermal elastohydrodynamic lubrication of point contact conjunctions, based upon the Newton-Raphson scheme and low iteration relaxation. The numerical results are compared with the numerical and experimental observations of others for the circular point contact of a ball against a flat glass disc under oscillating conditions. Good agreement has been found with other numerical solutions. The comparison with the experimental results shows good qualitative agreement.

Elastohydrodynamic Lubrication of Aspherical Metal-on-Metal Artificial Hip Joints

2009 ◽  
pp. 833-834
Author(s):  
Qingen Meng ◽  
Leiming Gao ◽  
Feng Liu ◽  
Peiran Yang ◽  
Fisher John ◽  
...  
Keyword(s):  
Elastohydrodynamic Lubrication ◽  
Hip Joints ◽  
Metal On Metal ◽  
Artificial Hip ◽  
Artificial Hip Joints

scholarly journals In vivo and in vitro outcomes of alumina, zirconia and their composited ceramic-on-ceramic hip joints

2013 ◽  
Vol 121 (1412) ◽  
pp. 382-387 ◽  
Author(s):  
Herman Shah Abd RAHMAN ◽  
Dipankar CHOUDHURY ◽  
Noor Azuan Abu OSMAN ◽  
Hanie Nadia SHASMIN ◽  
Wan Abu Bakar Wan ABAS
Keyword(s):  
Hip Joints ◽  
Ceramic On Ceramic

Influence of particulate and dissociated metal-on-metal hip endoprosthesis wear on mesenchymal stromal cells in vivo and in vitro

Biomaterials ◽  
2016 ◽  
Vol 98 ◽  
pp. 31-40 ◽  
Author(s):  
Anastasia Rakow ◽  
Janosch Schoon ◽  
Anke Dienelt ◽  
Thilo John ◽  
Martin Textor ◽  
...  
Keyword(s):  
Mesenchymal Stromal Cells ◽  
Stromal Cells ◽  
Hip Endoprosthesis ◽  
Metal On Metal

Wear of Historical Polyethylenes in Hip Prostheses. Biomechanical Success and a Biological Failure

2003 ◽  
Vol 13 (2_suppl) ◽  
pp. 17-27 ◽  
Author(s):  
E. Ingham ◽  
J. Fisher ◽  
M.H. Stone
Keyword(s):  
Polyethylene Wear ◽  
Simulation Models ◽  
Hip Joints ◽  
Hip Prostheses ◽  
Artificial Hip ◽  
Cause Of Failure ◽  
Artificial Hip Joints ◽  
Gamma Irradiated ◽  
Biological Simulation

Polyethylene wear debris induced osteolysis is a major cause of failure in artificial hip joints. Sub micrometre size particles are taken up by macrophages which are stimulated to release osteolytic cytokines such as TNFα. This leads to bone resorption, loosening and failure. In vitro cell culture studies have shown particles in the size range 0.1 to 1 micrometre to be at least six times more reactive than larger particles. Studies of historically used gamma irradiated in air polyethylene show increased wear rate with damaged femoral heads and with aged and oxidised polyethylene. The aged and oxidised polyethylene also produced a greater percentage of smaller particles leading to increased osteolytic potential. Combined tribological and biological simulation models have been developed for pre-clinical assessment of osteolytic potential of artificial hip joints.

TRIBOLOGY OF METAL-ON-METAL ARTIFICIAL HIP JOINTS

2009 ◽  
pp. 279-307
Author(s):  
ZHONG MIN JIN ◽  
SOPHIE WILLIAMS ◽  
JOANNE TIPPER ◽  
EILEEN INGHAM ◽  
JOHN FISHER
Keyword(s):  
Hip Joints ◽  
Metal On Metal ◽  
Artificial Hip ◽  
Artificial Hip Joints

The Elastohydrodynamic Lubrication of Heavily Loaded Point Contacts

1980 ◽  
Vol 22 (4) ◽  
pp. 183-187 ◽  
Author(s):  
C. J. Hooke
Keyword(s):  
Exact Solution ◽  
Film Thickness ◽  
Close Agreement ◽  
Numerical Solutions ◽  
Elastohydrodynamic Lubrication ◽  
Substantial Part ◽  
Line Contact ◽  
Point Contacts ◽  
Contact Width ◽  
Inlet Zone

It is shown that the film thickness in heavily loaded point contacts can be accurately calculated by comparing the inlet and exit zones of the contact with those of an equivalent line contact. The results become increasingly accurate as the extent of the inlet and exit regions is reduced and in the limit yields an exact solution. Even for moderately loaded contacts in which the inlet zone occupies a substantial part of the contact width the results are in close agreement with existing numerical solutions.

Metal-on-Metal Bearings and Hypersensitivity in Patients with Artificial Hip Joints

2005 ◽  
Vol 87 (1) ◽  
pp. 28-36 ◽  
Author(s):  
Hans-Georg Willert ◽  
Gottfried H. Buchhorn ◽  
Afshin Fayyazi ◽  
Renata Flury ◽  
Markus Windler ◽  
...  
Keyword(s):  
Hip Joints ◽  
Metal On Metal ◽  
Artificial Hip ◽  
Artificial Hip Joints
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