Title :
Wear mechanisms and particle generation in ultrahigh molecular weight polyethylene
Author :
Lankford, J. ; Blanchard, C.R. ; Agrawal, C.M.
Author_Institution :
Mater. Sci. & Applications Div., Southwest Res. Inst., San Antonio, TX, USA
Abstract :
The effect of varying the initial surface roughness of ultrahigh molecular weight polyethylene (UHMWPE) tested in reciprocating wear against CoCr pins in bovine serum is investigated. It is found that wear occurs in two distinct stages that appear and disappear cyclically. The low wear phase corresponds to the development of surface deformation features that degenerate into a high amplitude wavelike topography. The features wear by fibrillar pullout and microfracture, producing submicrometer particulate debris
Keywords :
molecular weight; polymers; prosthetics; surface topography; wear; CoCr; CoCr pins; UHMWPE; bovine serum; fibrillar pullout; high amplitude wavelike topography; initial surface roughness; low wear phase; microfracture; particle generation; reciprocating wear; submicrometer particulate debris; surface deformation features; ultrahigh molecular weight polyethylene; wear mechanisms; Bovine; Joints; Optical surface waves; Orthopedic surgery; Pins; Polyethylene; Rough surfaces; Surface roughness; Surface topography; Testing;
Conference_Titel :
Biomedical Engineering Conference, 1995., Proceedings of the 1995 Fourteenth Southern
Conference_Location :
Shreveport, LA
Print_ISBN :
0-7803-2083-2
DOI :
10.1109/SBEC.1995.514499
