Comparison of the Bearing Performance of Normal and Artificial Human Joints

1973 ◽  
Vol 95 (3) ◽  
pp. 333-339 ◽  
Author(s):  
P. S. Walker ◽  
B. L. Gold
Keyword(s):  
Hip Joints ◽  
Artificial Joints ◽  
Metal On Metal ◽  
Joint Lubrication ◽  
Artificial Hip ◽  
Normal Human ◽  
Artificial Hip Joints ◽  
Human Joints ◽  
Film Lubrication ◽  
Fluid Film Lubrication

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.

Contact Mechanics of Soft Layer Artificial Hip Joints: Part 1: General Solutions

1994 ◽  
Vol 208 (4) ◽  
pp. 195-205 ◽  
Author(s):  
J Q Yao
Keyword(s):  
Fluid Film ◽  
Contact Radius ◽  
Lubrication Mechanism ◽  
Hip Joints ◽  
Soft Layer ◽  
Synovial Joints ◽  
Artificial Hip ◽  
Artificial Hip Joints ◽  
Film Lubrication ◽  
Fluid Film Lubrication

Unlike natural synovial joints, which are lubricated with a full fluid film lubrication mechanism, conventional artificial hip joints are lubricated with a mixed lubrication mechanism. Recently, however, a new generation of artificial hip joints employing compliant layers to mimic the compliance of articular cartilage in natural synovial joints have been developed to provide fluid film lubrication in these joints. While satisfactory lubrication can be achieved by employing soft layers, compliant thin layers are susceptible to the debonding between the soft layer and its stiffer substrate and long-term mechanical fatigue failure. Stress analyses for different designs of such joints are therefore important. In the present paper, the circular contact between a rigid sphere and an elastomeric layer bonded on to a rigid substrate has been analysed with a novel semi-analytical approach. The detailed contact parameters (the contact radius, the maximum surface deformation, the contact pressure and the contact stress inside the layer) have been examined for a wide range of aspect ratios (0 ≤ a/ht ≤ 100).

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

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

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

The Frictional Behavior of Human Synovial Joints—Part I: Natural Joints

1975 ◽  
Vol 97 (3) ◽  
pp. 369-376 ◽  
Author(s):  
A. Unsworth ◽  
D. Dowson ◽  
V. Wright
Keyword(s):  
Squeeze Film ◽  
Frictional Torque ◽  
Hip Joints ◽  
Artificial Joints ◽  
Frictional Properties ◽  
Plastic Type ◽  
New Type ◽  
Sudden Loading ◽  
Human Joints ◽  
Film Lubrication

Some theoretical consideration has been given to the use of pendulum machines when used to examine the frictional properties of human joints by incorporating them as fulcra. As a result, a new type of pendulum machine has been built which incorporates the facility to apply sudden loads to the joint on starting the swinging motion, and also the ability to measure directly the frictional torque experienced by the joint. The results obtained from natural hip joints (reported in Part I) indicate the presence of squeeze film lubrication under conditions of sudden loading. In addition, a self-generated fluid film process was observed at low loads whilst at high loads boundary lubrication appeared to be important. Artificial joints (Part II) are shown to exhibit similar lubrication properties to the natural joints but with a higher absolute value of friction. The metal on plastic type of joint is shown to exhibit a creeplike phenomenon which recovers with time.

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

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

2005 ◽  
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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