To improve lifetime and surface stability of UHMW polyethylene acetabular cup, the role of its relative hardness and stiffness against abrasive part should be reconsidered. This study assumed an accelerated condition for a hip joint movement simulation and tried to interpret the occurrence of wear debris generation. In clinical point of view, particles with dense morphologies, several microns in dimension are usually observed upon the environs of the retrieved hip joint prosthesis. This may consequently lead to the particular evidence as one of the major factors that causes eventually loosening of implants. However, current studies tended to support that the morphologies and concentrations of wear debris generated were varied with different testing cycles, which included carbonates from scissioned polyethylene (usually low M(w)) in spherical foam-like or plate-like forms, metallic ions and metal oxides. The accumulation of mass increased with testing cycles, but it was not shown as a linear relationship, probably because the releases of wear species augmented in an added sequence. As strain-hardening effect greatened on the polyethylene, a rubbed, load-bearing and visco-plastic surface gradually created a rigid layer. The plate-like wear debris was conceivably correlated with the destruction of the hardened layer. Through the tests by a cup-on-ball simulator, the result might have provided practical information for proceeding biomaterials' evaluation or as a reference to compare with clinical observations.
|Number of pages||10|
|Journal||Biomedical Engineering - Applications, Basis and Communications|
|Publication status||Published - 1999 Jun 25|
All Science Journal Classification (ASJC) codes
- Biomedical Engineering