A simple mixed lubrication model has been developed to predict the asperity contact and wear for the metal-on-metal bearing couple for total hip joint replacements. It has been shown that the femoral head radius has a large effect on the predicted asperity contact and wear depending on the lubrication regime. An increase in the femoral head radius can lead to an increase in wear under a predominantly boundary lubrication regime, but this trend can be reversed under a mixed lubrication regime towards fluid film lubrication. These observations are consistent with the recent experimental findings from hip simulator studies by Smith and co-workers.
McKellopH.ParkS. H.ChiesaR.DoornP.LuB.NormandP.GrigorisP.AmstutzH.In vivo wear of 3 types of metal on metal hip prostheses during 2 decades of useClin. Orthop. (Suppl.), 1996, 29S, 128–140.
2.
ChanF. W.BobynJ. D.MedleyJ. B.KrygierJ. J.TanzerM.The Otto Aufranc Award—wear and lubrication of metal-on-metal hip implantsClin. Orthop. Related Res., 1999, 369, 10–24
3.
McMinnD.TreacyR.LinK.PynsentP.Metal on metal surface replacement of the hip. Experience of the McMinn prosthesisClin. Orthop., (Suppl.), 1996, 29S, 89–98.
4.
SmithS. L.DowsonD.GoldsmithA. A.The effect of femoral head diameter upon the lubrication and wear of metal-on-metal total hip replacementsProc. Instn Mech. Engrs, Part H, Journal of Engineering in Medicine, 2001, 215 (H2), 161–170.
5.
JohnsonK. L.GreenwoodJ. A.PoonS. Y.A simple theory of asperity contact in elastohydrodynamic lubricationWear, 1972, 19, 91–108.
6.
HamrockB. J.DowsonD.Elastohydrodynamic lubrication of elliptical contacts for materials of low elastic modulus. 1: Fully flooded conjunctionTrans. ASME, J. Lubric. Technol., 1978, 100, 236–245.
7.
GreenwoodJ. A.TrippJ. H.The contact of two nominally flat rough surfacesProc. Instn Mech. Engrs, Part H, Journal of Engineering in Medicine, 1971, 185, 623.
8.
PatirN.ChengH. S.Effect of surface roughness orientation on the central film thickness in E.H.D. contacts In Proceedings of the 5th Leeds-Lyon Symposium on Tribology, 1971, pp. 15–21 (Institution of Mechanical Engineers, London).
