Four Station Knee Simulator Wear Testing Comparing Titanium Niobium Nitride with Cobalt Chrome

An AMTI knee simulator was used to evaluate the wear of UHMWPE tibial inserts which were gamma sterilized in air and displayed a high or low level of oxidation. After 5 million cycles, four out of five samples from the high oxidation group displayed subsurface cracking and/or delamination. The five specimens in the low oxidation group experienced burnishing only. These results indicate that gamma irradiation in air together with high oxidation due to shelf aging can increase susceptibility to wear. The appearance of the wear scars indicates that knee simulator testing is a valid method of producing burnishing, cracking, and delamination similar to that seen in-vivo. [S0742-4787(00)04301-0]

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Biochemical comparisons of osteoarthritic human synovial fluid with calf sera used in knee simulator wear testing

Journal of Biomedical Materials Research Part A ◽

10.1002/jbm.a.32728 ◽

2010 ◽

Vol 9999A ◽

pp. NA-NA ◽

Cited By ~ 1

Author(s):

J.-M. Brandt ◽

L. K. Brière ◽

J. Marr ◽

S. J. MacDonald ◽

R. B. Bourne ◽

...

Keyword(s):

Synovial Fluid ◽

Wear Testing ◽

Knee Simulator ◽

Human Synovial Fluid

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Wear of Artificial Joint Materials III

Engineering in Medicine ◽

10.1243/emed_jour_1981_010_038_02 ◽

1981 ◽

Vol 10 (3) ◽

pp. 137-142 ◽

Cited By ~ 19

Author(s):

R W Treharne ◽

R W Young ◽

S R Young

Keyword(s):

Wear Rate ◽

Contact Area ◽

Inverse Relationship ◽

Wear Testing ◽

Artificial Joint ◽

Knee Prostheses ◽

Wear Rates ◽

Knee Simulator ◽

Total Knee

This paper describes a new method for testing total knee prostheses under simulated in vivo conditions. Previous knee simulator work has been summarized and described. The major variables of testing are also described in detail. The results of wear testing five types of knee prostheses were that the wear rate was nearly an inverse relationship with contact area— knees with a higher contact area had lower wear rates.

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TEM sample preparation of wear-tested room-temperature pulsed-laser-deposited thin films of MoS2 by ultramicrotomy

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100151428 ◽

1993 ◽

Vol 51 ◽

pp. 1118-1119

Author(s):

Pamela F. Lloyd ◽

Scott D. Walck

Keyword(s):

Thin Films ◽

Sample Preparation ◽

Room Temperature ◽

High Vacuum ◽

Pulsed Laser ◽

Ultra High Vacuum ◽

Wear Testing ◽

Preparation Technique ◽

Cross Sectional ◽

Aerospace Applications

Pulsed laser deposition (PLD) is a novel technique for the deposition of tribological thin films. MoS2 is the archetypical solid lubricant material for aerospace applications. It provides a low coefficient of friction from cryogenic temperatures to about 350°C and can be used in ultra high vacuum environments. The TEM is ideally suited for studying the microstructural and tribo-chemical changes that occur during wear. The normal cross sectional TEM sample preparation method does not work well because the material’s lubricity causes the sandwich to separate. Walck et al. deposited MoS2 through a mesh mask which gave suitable results for as-deposited films, but the discontinuous nature of the film is unsuitable for wear-testing. To investigate wear-tested, room temperature (RT) PLD MoS2 films, the sample preparation technique of Heuer and Howitt was adapted.Two 300 run thick films were deposited on single crystal NaCl substrates. One was wear-tested on a ball-on-disk tribometer using a 30 gm load at 150 rpm for one minute, and subsequently coated with a heavy layer of evaporated gold.

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