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EnglishThe impact of femoral head surface roughness on wear of gamma-irradiation sterilized (3 MRad in nitrogen crosslinked) and nonsterilized (not crosslinked) UHNWPE acetabular cups has been evaluated. Gravimetric wear testing was performed in a hip joint simulator for 2x106 cycles. CoCrMo heads were used with different surface roughness (Ra=15 nm and Ra=400 nm). 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.
| Titolo: | Effect of head surface roughness and sterilization on wear of UHMWPE acetabular cups |
| Autore/i: | A. Jedenmalm; S. Affatato; TADDEI, PAOLA; W. Leardini; U. W. Geddel; FAGNANO, CONCEZIO; M. Viceconti |
| Autore/i Unibo: | |
| Anno: | 2009 |
| Rivista: | |
| Digital Object Identifier (DOI): | http://dx.doi.org/10.1002/jbm.a.32161 |
| Abstract: | The impact of femoral head surface roughness on wear of gamma-irradiation sterilized (3 MRad in nitrogen crosslinked) and nonsterilized (not crosslinked) UHNWPE acetabular cups has been evaluated. Gravimetric wear testing was performed in a hip joint simulator for 2x106 cycles. CoCrMo heads were used with different surface roughness (Ra=15 nm and Ra=400 nm). 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. |
| Data prodotto definitivo in UGOV: | 2009-11-25 11:39:42 |
| Appare nelle tipologie: | 1.01 Articolo in rivista |
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