Porous coated total hip replacement system

A hip joint prosthesis comprising, in combination:

• an inert metal alloy intramedullary stem having posterior, proximal anterior and distal anterior surfaces defined by respective confluent arcs which enable said stem to anatomically conform to the femoral canal, the stem having a medial collar adjacent an upper end of a proximal portion, the collar extending medially outwardly from the stem for engagement with the calcar region of the femur, said upper end terminating in a tapered shaft adapted to receive a femoral head component, the stem having a smooth distal portion with a lower end flattened to form an anterior stem tip to avoid impingement with the cortices, thereby preventing distal loading and consequent mid-thigh pain;
• a porous coating of metal beads providing a porous surface of interconnected three dimensional pores over the proximal portion of the stem and an underside of said medial collar, said coating adapted to mechanically interlock the proximal stem area with both soft cancellous and hard cortical bone tissue of the femur;
• an inert metal alloy femoral head having a smooth substantially spherical outer bearing surface and adapted to be attached to the tapered shaft of the stem, intraoperatively;
• an inert metal alloy acetabular cup for attachment to the acetabulum having a substantially hemispherical shape and inner and outer surfaces, with a porous coating of metal beads affixed to substantially all of said outer surface to thereby provide a porous surface of interconnected three dimensional pores, said inner surface being substantially smooth;
• and
• an inert high density polymeric bearing having a substantially hemispherical shape and adapted to be attachably received within said cup and to receive the femoral head so as to permit said femoral head to articulate freely therein.