Lubrication Model of an Artificial Hip Joint: Pressure Profile Versus Inclination Angle of the Acetabular Cup

[+] Author and Article Information
Donna M. Meyer, John A. Tichy

Department of Mechanical Engineering, Aerospace Engineering and Mechanics, Rensselaer Polytechnic Institute, Troy, NY 12180

J. Tribol 121(3), 492-498 (Jul 01, 1999) (7 pages) doi:10.1115/1.2834094 History: Received January 23, 1998; Revised July 09, 1998; Online January 24, 2008


Formulation of a three-dimensional, quasi-static lubrication model of an artificial hip joint is proposed which includes the inclination angle of the acetabular cup. This is performed by deriving a transformed Reynolds equation accounting for this cup tilt angle. The numerical simulation also addresses mass conservation at the location of film rupture. A 3-D spherical representation of the articulating surfaces of the hip prosthesis is mapped onto a cartesian coordinate system of the entire geometry of the “ball and socket” joint. Results include the lubricating fluid pressure distributions for various inclination angles of the acetabular cup demonstrating that the greatest pressures occur for large eccentricities in the upward vertical direction.

Copyright © 1999 by Journal of Tribology
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