Increase in free radicals on UHMWPE hip prostheses components due to inflamed synovial cell products.
J Biomed Mater Res
; 57(1): 35-40, 2001 Oct.
Article
en En
| MEDLINE
| ID: mdl-11416846
ABSTRACT
Oxidative degradation of artificial UHMWPE joint implants caused by gamma-ray sterilization is thought to be responsible for the production of wear debris resulting in adverse tissue responses. On the other hand, it is well known that inflammation is associated with generation, by inflammatory cells, of free radicals (H(2)O(2) and NO) and destructive proteolytic enzymes (collagenases), which creates a strong oxidative environment. We hypothesized that when an UHMWPE implantation was performed in an inflammatory joint environment, the oxidative substances produced by inflamed synoviocytes could increase oxidative degradation of the polyethylene insert. We measured the amount of free radicals on conventional and on Duration-treated polyethylene samples by the electron spin resonance (ESR) technique before and after exposure of the samples to (1) inflamed synovial cell cultures; (2) normal synovial cell cultures; and (3) medium alone. We observed an increase in the number of free radicals on polyethylene samples after their immersion in cell cultures. Furthermore, it was observed that the increase of free radicals on polyethylene correlated with the degree of inflammation of synovial cells in culture.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Polietilenos
/
Materiales Biocompatibles
/
Artroplastia de Reemplazo de Cadera
Límite:
Humans
Idioma:
En
Revista:
J Biomed Mater Res
Año:
2001
Tipo del documento:
Article
País de afiliación:
Italia