Acetabular ring prosthesis with reinforcement buttress

An acetabular prosthesis for cement implantation comprising;

• a) a thin prosthesis cup body having a wall with a thickness of between 1 and 3 mm, the body having a distal concave surface area, a central portion, a proximal convex surface, and an annular rim defining a cup periphery;
• b) the cup body having at least a pair of flanges that extend away from the cup central portion;
• c) a plastic liner that can be cemented to the concave surface area of the cup body, the liner having a wall with a thickness much greater than the thickness of the cup body and a concave surface and a convex surface that registers with the concave surface area of the cup body;
• d) the cup body wall having a plurality of openings therethrough;
• e) some of the openings being bone screw receptive openings that are reinforced with an annular reinforcement that extends away from the convex surface of the cup body;
• f) a cement mantle for affixing the plastic liner to the cup body;
• g) the cup body having a peripheral buttress extending downwardly from the distal side of the cup body for supporting a portion of cement of the cement mantle at a peripheral interface position in between the liner and body;
• and
• h) wherein the cement mantle flows through at least some of the openings upon assembly of the cup liner to the cup body.

A acetabular cup prosthesis comprising:

• a) a cup member having an inner, distal concave surface and an outer, proximal convex surface;
• b) the cup member having an apex and a rim that extends about the periphery of the cup member, the rim having a portion that defines a rim plane;
• c) a curved flange portion that extends a partial distance around the cup member and away from the convex surface of the cup member, the flange portion having lower surface and an edge that falls in a flange plane that forms an angle with the rim plane;
• and
• d) a buttress mounted on the distal concave surface of the cup body and at the lower surface of the flange portion and that extends distally downwardly from the flange portion, the buttress being curved to generally follow the curved flange member.

A acetabular cup prosthesis comprising:

• a) a thin cup member having a distal side with an inner concave surface, a proximal side with an outer convex surface, and a cup wall;
• b) the cup member having an apex and a rim that extends about the periphery of the cup member, the rim having a portion that defines a rim plane;
• c) a curved flange portion that extends a partial distance around the cup member and away from the convex surface of the cup member, the flange portion having lower surface and an edge that falls in a flange plane that forms an obtuse angle with the rim plane;
• and
• d) a buttress mounted on the distal side at the lower surface of the flange portion and that extends distally downwardly from the flange portion, the buttress being curved.

A acetabular cup prosthesis comprising:

• a) a cup member having a distal side with an inner concave surface and a proximal side with an outer convex surface;
• b) the cup member having an apex and a rim that extends about the periphery of the cup member, the rim having a portion that defines a rim plane;
• c) a plurality of circumferentially spaced, radially extending flange portions that each extend a partial distance around the cup member and away from the cup rim;
• and
• d) a buttress mounted on the distal surface of the cup member, and that extends distally downwardly from the rim plane.