Patent ID: 7520902
Filing Date: 2009-04-21
Classification: A61F

Abstract:
1. A prosthetic hip joint replacement system comprising: a femoral component having a trunion thereon; a modular head with a part-spherical outer surface terminating in a planar surface, said planar surface having an axial bore for engaging the trunion on the femoral component; an acetabular cup member for receiving the part-spherical head of a femoral implant, the cup member comprising, a cavity having a hemi-spherical inner bearing surface for receiving the modular head, said hemi-spherical inner surface defining a polar axis perpendicular to a plane of an equator spaced from a proximal pole of the cavity, said cavity having a part-circular opening for receiving said modular head, the opening lying in a plane parallel to the plane of the equator and spaced an axial distance from said proximal pole a greater distance than the plane containing said equator, said opening having a circular portion and a non-circular portion, the non-circular portion of the opening alignable with the planar head portion during insertion of the head into the cavity and a plane perpendicular to the equator through a center of the circular portion forming said part-circular opening being offset from a parallel plane containing said polar axis of the hemi-spherical inner surface of the cavity.