Knee-simulator testing of conventional and cross-linked polyethylene tibial inserts.
J Arthroplasty
; 19(7): 887-97, 2004 Oct.
Article
em En
| MEDLINE
| ID: mdl-15483806
ABSTRACT
We compared the resistance to delamination and to adhesive/abrasive wear of conventional and highly cross-linked polyethylene tibial inserts of a cruciate-retaining total knee design using a knee simulator. Both groups were tested after aggressive, accelerated aging, and 1 set of conventional inserts was studied without aging. Aging oxidized the conventional, but not the highly cross-linked, inserts. The simulated normal gait testing lasted for 5 and 10 million cycles for the conventional and highly cross-linked inserts, respectively. Aged conventional inserts showed delaminations, whereas none were observed in the unaged conventional and aged cross-linked inserts. Wear rates measured by the gravimetric method were 9 +/- 2 mm3, 10 +/- 4 mm3, and 1 +/- 0 mm3 per million cycles; by the metrologic method, they were 8 +/- 1 mm3, 9 +/- 2 mm3, and 3 +/- 0 mm3 for the unaged conventional, aged conventional, and aged highly crosslinked inserts, respectively. In the test model used, oxidation led to delamination, whereas increased cross-link density resulted in reduced adhesive/abrasive wear of tibial inserts.
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Base de dados:
MEDLINE
Assunto principal:
Polietilenos
/
Análise de Falha de Equipamento
/
Prótese do Joelho
Idioma:
En
Ano de publicação:
2004
Tipo de documento:
Article