A parametric analysis of the contact stress in ultra-high molecular weight polyethylene acetabular cups

摘要: Abstract It is well known that the wear factor for ultra-high molecular weight polyethylene (UHMWPE) sliding on metallic or ceramic counterfaces largely independent of contact stress modest loading conditions and distances. However, it now recognized under more severe levels with distances comparable to those encountered in current replacement synovial joints, subsurface fatigue contributes volume debris. Since process influenced by surface becoming increasingly important limit through design order minimize UHMWPE debris implants. The pressure acetabular cups has been predicted using both simple elasticity analysis finite element method. shown radial clearance between femoral head socket dominant parameter determining stress. Thus, should be controlled so half width close radius (a total included angle 120°) pressure. There little benefit gained increasing greater than radius. This consistent geometrical constraint anatomical position direction loading. most significant effect maximum these closely conforming contacts where elastic modulus thickness relatively small conditions. an increase a decrease layer result required this may prove impractical. places further contact. paper demonstrates careful selection tribological parameters, can reduced easily achieved larger diameter heads.