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Brandie Wilde
08-27-2002, 04:55 AM
The following is a posting I sent out as well as the responses I received.
I appreciate all who were willing to help out and wish you the best in your
work!

At present I am doing a bit of research in the area of artificial joint
testing and am having a hard time finding an answer to my question. I
thought maybe someone out there may have information that would help.
Earlier in the month I heard of the testing of joints being done in
solution. I am wondering about the procedure, make-up of the solution, if a
type of membrane is used what is the material etc. The only info I have
found thus far was from Yoshinori SAWAE and Teruo MURAKAMI. If you have any
other information, know of articles written or someone I could contact
regarding this matter, I would greatly appreciate it. Thank you for your
time. I'll be sure to post any info I receive.

Brandie Wilde
wilde@arc.ab.ca or wildbm@uleth.ca
Alberta Research Council
Calgary, Alberta, Canada
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Dear Brandie,

It depends a lot on what is the research question you are addressing.
If you are looking at corrosion of coupled surfaces or wear, you
cannot neglect the effect of the fluids. Conversly, if you are
looking at phenomena such as load transfer or static failure, in
most cases you can neglect the effect of the fluids.

Best regards,

Luca Cristofolini
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I design prosthetic hips, and am required to test the hip stems according to
ISO 7206, which calls out the testing to be done in a fluid test medium
which is a solution of analytical grade sodium chloride, (NaCl = 9g/l),
continuously aerated, in distilled or deionized water of grade 3 as
specified in ISO 3696.

Erica
Walsh ----------------------------------------------------------------------
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Hi Brandie,

If you mean testing of total joint replacement materials, they are usually
packaged in sterile bags inside of which is placed about 16 ounces of bovine
serum. This is fairly standard.

If you mean, prosthetics, then I don't think I can help.

Andrew Mahar, MS
Orthopedic Biomechanics Research Center

Children's Hospital - San Diego
MC5054
3020 Children's Way
San Diego, CA
92123-4282
P: 858-495-4975 "For want of a nail,
F: 858-614-7494 the empire was lost."
amahar@chsd.org -proverb
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Hi Brandie

I'm working with a group researching the wear of UHMWPE as it relates to
total knee prostheses, and we also have found that there is a grey area
regarding appropriate lubrication.

ISO standard 14243 (test protocol for TKRs) specifies diluted bovine serum
with protein content within a fairly wide range (I don't have the numbers
at my fingertips). There is also some discussion within the community
about whether it is necessary to add EDTA and bactericide and fungicide to
the solution. The answer to this latter question seems to depend on
whether you are an engineer (and can't keep anything sterile) or a
bioscientist (and sterility is a matter of course)


The attached .pdf file includes a really short version of the lubricant
recipe that we are using. If you decide you like our recipe, let me know
and I'll get you more details.

There are lots of papers discussing lubricant effects on UHMWPE wear, and a
standard search using "UHMWPE", "wear" as keywords should turn up a bunch.

Some to start with are

Blanchet, Peterson, Rosenburg, Serum lubricant absorption by UHMWPE
orthopaedic bearing implants, 2002

Wang A, Essner, Polineni, Stark Dumbleton, Lubrication and wear of ultra
high molecular weight polyethylene in total joint replacements, 1998

Affatato, Vandelli, Bordini, Toni, Fluid absorption study in ultra high
molecular weight polyethylene sterilized and unsterilized acetabular cups,
2001

Bell, Besong, Tipper, Ingham, Wroblewski, Stone, Fisher, Influence of
gelatin and bovine serum lubricants on ultra high molecular weight
polyethylene wear debris generated in in vivo simulations, 2000.

Paul Ostic
Queen's University
Kingston ON
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Brandie,
For many years we have investigated mainly the influence of lubricants and
testing conditions on tribological behavior of artificial joints.
Recent reports are shown as bellow.

Yoshinori SAWAE and Teruo MURAKAMI
Role of Synovia in Wear Mechanism of UHMWPE
Tribology in Biomechanical Systems, Science and Applications, Ed. by F.
Franek
et al., Expert Verlag, pp. 31-45?September, 2001

Teruo MURAKAMI and Shunichiro DOI
Influence of Material Combinations and Lubricants on Friction and Wear in
Ceramic-on-Ceramic Sliding Pairs for Joint Prostheses
Bioceramics, Vol. 14, pp.521-524, November, 2001

Teruo Murakami,
Kyushu University

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