Acetabular cup assembly for multiple bearing materials

摘要

A modular acetabular cup assembly (10, 100, 200, 300, 350) for use with multiple bearing liners (32, 110, 212, 310, 354) is disclosed. The acetabular cup assembly includes a shell (12) having a tapered inner wall (28) and two circumferential grooves (24, 26). The shell (12) may be used with polyethylene, ceramic, metal, and other types of liners.

主权项

1. An acetabular cup assembly, comprising:
a. a shell, the shell having a generally concave inner surface, an outer surface, an end face, and an apex, said inner surface further defining an inner wall, a first groove, a second groove, and a protrusion located between the first groove and the second groove and extending inwardly beyond the inner wall, the second groove being closer to the apex of said shell than the first groove, wherein the shell further comprises at least one inwardly-facing scallop; and b. a liner adapted to fit within said inner surface of said shell, the liner comprising an inner portion and a generally convex outer portion, said outer portion including a first bump and a second bump, said second bump being closer to the apex than said first bump, wherein the liner further comprises at least one anti-rotation tab received in the at least one inwardly-facing scallop; and c. wherein a central axis extends through the apex, a line extends from where the inner surface of the shell meets the second groove to where the central axis meets a plane defined by the end face of the shell, the central axis and the line defining an angle, and wherein the angle ranges from forty degrees to seventy degrees.