Small diameter ceramic/ceramic femoral prosthesis

摘要

The prosthesis consists of a spherical head fitted to the end of a femoral shank and performing a sliding motion relative to a cavity in a cup fitted in the patient's pelvis. The head, at least in its outer part, is made from a ceramic material comprising at least 95% tetragonal polycrystalline zircon stabilized with yttrium oxide and produced by high-pressure isostatic fritting. The prosthesis consists of a 22 mm diameter spherical head (11) fitted to the end of a femoral shank (12) and performing a sliding motion relative to a cavity in a cup (13) fitted in the patient's pelvis (14). The head, at least in its outer part, is made from a ceramic material comprising at least 95% tetragonal polycrystalline zircon stabilized with yttrium oxide and produced by high-pressure isostatic fritting. The cup has a ceramic lining (16) and an intermediate insert (17).