Metal-on-metal hip simulator study of increased wear particle surface area due to 'severe' patient activity.
Proc Inst Mech Eng H
; 220(2): 279-87, 2006 Feb.
Article
en En
| MEDLINE
| ID: mdl-16669394
ABSTRACT
This study investigated changes in metal-on-metal (MOM) hip wear and wear particle characteristics arising from a more aggressive patient activity level compared with normal walking. The test hypothesis was that 'severe'-gait conditions will change wear, wear particle sizes, and morphology owing to a decline in joint lubrication. Four carbon MOM hip bearings 40 mm high were subjected to normal-walking and fast-jogging simulations in an orbital hip joint simulator with 25 per cent alpha-calf serum as a lubricant. Co-Cr-Mo wear particles were extracted using an enzymatic method, and prolate ellipsoid equations were used to estimate particle volume and surface area. Fast-jogging simulations generated a sevenfold increase in volumetric wear, a 33 per cent increase in mean wear particle size, and a threefold increase in the number of larger (needle) particles compared with walking. This resulted in a twentyfold increase in total wear particle surface area per 10(6) cycles compared with walking, thereby confirming our hypothesis. The clinical significance of this result suggests that highly active MOM patients may exhibit greater ion release than less active patients.
Buscar en Google
Banco de datos:
MEDLINE
Asunto principal:
Vitalio
/
Materiales Biocompatibles
/
Falla de Prótesis
/
Prótesis de Cadera
/
Locomoción
Tipo de estudio:
Evaluation_studies
Límite:
Humans
Idioma:
En
Año:
2006
Tipo del documento:
Article