Acetabulum part for a total hip prosthesis

An acetabulum part for a total hip prosthesis comprising the combination of a metallic anchoring shell in the shape of a cap having a rim, a substantially spherical convex outer surface facing the pelvic bone and a concave interior surface;

• means defining a plurality of through-slots of substantially equal width through said shell extending over an angle of between about 210.degree. and 270.degree. as measured along a latitudinal line, said through-slots being substantially uniformly angularly spaced, each of said through-slots being elongated along a longitude of a sphere conforming to said spherical surface, each of said through-slots having a semicircular end and said through-slots being dimensioned to provide sufficient area for the introduction and implantation of bone graft material therein.
• means defining a plurality of holes located only in areas not occupied by said through-slots between an equatorial line about said spherical surface and the pole of said spherical surface, each of said holes having an elongated cavity in the shape of a portion of an ellipsoid adjacent the interior surface of said shell to receive an enlarged head of an anchoring screw so that said head does not protrude inwardly beyond said interior surface, each said cavity being shaped to receive a head so that the screw extends into the pelvic bone at an angle which diverges from the central axis of the associated hole by between about 20.degree. and about 30.degree.;
• a plurality of anchoring screws shaped and dimensioned to pass outwardly through said holes and into the pelvis, each of said anchoring screws having an enlarged head for engaging said shell for adhesive-free primary anchoring of said shell in the pelvic bone;
• and
• a plurality of socket inserts each having an exterior surface shaped to conform to the interior surface of said shell so that said socket is non-rotatably receivable in said shell in the absence of an adhesive, each of said inserts having an interior surface shaped and dimensioned to receive one of a plurality of synthetic femur heads of different sizes for substantially friction-free, undisturbed movement of said one of said femur heads therein.

An acetabulum part for a total hip prosthesis comprising the combination of

• a metallic anchoring shell in the shape of a cap having a rim, a substantially spherical convex outer surface facing the pelvic bone and a concave interior surface;
• means defining a plurality of through-slots through said shell, said through-slots being elongated along longitudes of a sphere conforming to said spherical surface and said through-slots being dimensioned to provide sufficient area for the introduction and implantation of bone graft material therein;
• means defining a plurality of holes located between an equatorial line about said spherical surface and the pole of said spherical surface;
• a plurality of anchoring screws shaped and dimensioned to pass outwardly through said holes and into the pelvis for adhesive-free primary anchoring of said shell in the pelvic bone;
• and
• a plurality of socket inserts each having an exterior surface shaped to conform to the interior surface of said shell so that each said socket is non-rotatably receivable in said shell in the absence of an adhesive, each of said inserts having an interior surface shaped and dimensioned to receive one of a plurality of synthetic femur heads of different sizes for substantially friction-free, undisturbed movement of said one of said femur heads therein.