Effect of head surface roughness and sterilization method on wear of UHMWPE acetabular cups: preliminary hip joint simulator results

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Jedenmalm, AnneliKTH,Materialvetenskap (författare)

Effect of head surface roughness and sterilization method on wear of UHMWPE acetabular cups : preliminary hip joint simulator results

Artikel/kapitelEngelska2006

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2008-09-05
ASMEDC,2006
printrdacarrier

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LIBRIS-ID:oai:DiVA.org:kth-14266
https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-14266URI
https://doi.org/10.1115/esda2006-95512DOI

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Språk:engelska
Sammanfattning på:engelska

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Anmärkningar

QC 20100729
More than one million hip joint replacements are performed each year in the world. However, the implants do not last forever due to material limitations, even though the operation is successful. The most common material combination used today is a CoCr head articulating against an UHMWPE (Ultra High Molecular Weight Polyethylene) acetabular cup. Several investigations have shown that the metal head is roughened inside the body and thus accelerating wear of the polymer cup. The sterilization method is also known to have effect on the wear properties. In vitro wear tests are however usually performed with as new implants. This investigation aimed at study the impact of head surface roughness on wear of both sterilized and non-sterilized acetabular cups. A total of nine acetabular cup and head pairs were wear tested in a hip joint simulator for 2Million cycles (Mc) with bovine calf serum as lubricant. Wear was determined by weighing of all cups. The heads were of CoCrMo and the average initial head surface roughness was 15nm (R-a), measured with a white light interference profilometer. The roughening was produced with a SiC paper producing circular multidirectional wear tracks to a surface roughness of about 400nm (R-a). The cups were of UHMWPE and the sterilized cups were 3Mrad gamma-radiated in nitrogen. The surface roughness after wear test was unchanged for the roughened heads, while the initially smooth heads were slightly roughened. Preliminary results show that the rough heads increase the wear of the cups 2-fold. The gamma-irradiation affected both wear- and soak rate.

Ämnesord och genrebeteckningar

TEKNIK OCH TEKNOLOGIER Medicinteknik Medicinsk laboratorie- och mätteknik hsv//swe
ENGINEERING AND TECHNOLOGY Medical Engineering Medical Laboratory and Measurements Technologies hsv//eng
Hip prostheses; Hip simulator; Roughened femoral heads; Surface roughness; UHMWPE; Wear
Medical engineering
Medicinsk teknik

Biuppslag (personer, institutioner, konferenser, titlar ...)

Leardini, WaltherLaboratorio di Tecnologia Medica, Istititi Ortppedci Rizzoli, Bologna (författare)
Zavalloni, MaraLaboratorio di Tecnologia Medica, Istititi Ortppedci Rizzoli, Bologna (författare)
Affatato, SaverioLaboratorio di Tecnologia Medica, Istititi Ortppedci Rizzoli, Bologna (författare)
KTHMaterialvetenskap (creator_code:org_t)

Sammanhörande titlar

Ingår i:Proceedings of 8th Biennial ASME Conference on Engineering Systems Design and Analysis, ESDA2006, Vol. 3: ASMEDC9780791837795

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