Wear of Retrieved UHMWPE Hip Liners
Yonsei Medical Journal
;
: 293-299, 2004.
Artículo
en Inglés
| WPRIM
| ID: wpr-162563
ABSTRACT
After the gamma-irradiation sterilization, the most widely used orthopaedic grade polymer bearing liner material for the total joint replacement, ultra-high molecular weight polyethylene (UHMWPE), degrades through the progressive in vivo oxidation. The oxidative degradation makes UHMWPE brittle and leads to reduction of its mechanical properties. In this study, the effect of the in vivo post-irradiation ageing time on the wear of UHMWPE was investigated. Twelve retrieved polyethylene hip liners implanted for 3-16 years and then stored in the air for 1.5-8 years were used. Two types of the pin-on-disk wear testing were conducted. The uni-directional repeat pass rotating and the linear reciprocating wear testing were done with stainless steel disks against stationary polyethylene pins under 4MPa at 1Hz with bovine serum lubrication. Wear of the retrieved polyethylene hip liners does not have significant correlation with the in vivo or total ageing time. The linear reciprocal sliding motion generated a more pronounced wear than the uni-directional repeat pass sliding motion. This indicates that the kinematic motion significantly affects the wear of aged UHMWPE, having a brittle, white band region.
Texto completo:
Disponible
Índice:
WPRIM (Pacífico Occidental)
Asunto principal:
Oxidación-Reducción
/
Polietilenos
/
Fenómenos Biomecánicos
/
Técnicas In Vitro
/
Ensayo de Materiales
/
Artroplastia de Reemplazo de Cadera
/
Rayos gamma
Límite:
Humanos
Idioma:
Inglés
Revista:
Yonsei Medical Journal
Año:
2004
Tipo del documento:
Artículo
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