Effect of head surface roughness and sterilization on wear of UHMWPE acetabular cups
2009 (English)In: Journal of Biomedical Materials Research, ISSN 0021-9304, E-ISSN 1097-4636, Vol. 90, no 4, 1032-1042 p.Article in journal (Refereed) Published
The impact of femoral head surface roughness on wear of gamma-irradiation sterilized (3 MRad in nitrogen, crosslinked) and nonsterilized (not crosshnked) UHMWPE acetabular cups has been evaluated. Gravimetric wear testing was performed in a hip joint simulator for 2 x 10(6) cycles. CoCrMo heads were used with different surface roughness (R-a = 15 nm and R-a = 400 rim). The surface roughness after wear test was unchanged for the roughened heads, whereas the initially smooth heads showed a few scratches. The roughened heads increased the wear of the acetabular cups 2-fold. The gamma-irradiated cups tested against rough heads underwent the highest wear. The absorption of water was highest for the gamma-irradiated cups (0.0204% compared to 0.0031% after 85 days). Raman spectroscopy showed small but significant crystallinity changes in the wear zone, where the gamma-irradiated cups with the most extensive abrasion increased in crystallinity, whereas the nonsterilized cups underwent a crystallinity decrease.
Place, publisher, year, edition, pages
2009. Vol. 90, no 4, 1032-1042 p.
Crystallinity; Gamma-irradiation; Raman spectroscopy; Roughness; UHMWPE acetabular cups
Medical Laboratory and Measurements Technologies
IdentifiersURN: urn:nbn:se:kth:diva-14275DOI: 10.1002/jbm.a.32161ISI: 000268940100009ScopusID: 2-s2.0-68249152033OAI: oai:DiVA.org:kth-14275DiVA: diva2:331992
QC 201007292010-07-292010-07-292010-07-29Bibliographically approved