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 an inner surface, an outer surface, a face positioned at an upper end of the shell, and an apex positioned at a lower end of the shell, said inner surface comprising at least one inwardly-facing scallop positioned adjacent the face, a tapered inner wall extending below the at least one scallop toward the apex, an upper groove formed below the tapered inner wall, a lower groove formed below the upper groove, and a protrusion formed between the upper groove and the lower groove, the protrusion defining an upper side of the lower groove and a lower side of the upper groove; 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 an upper bump, a lower bump, and at least one tab, wherein the at least one tab is configured to be received in the at least one inwardly-facing scallop; and c. wherein the upper and lower grooves in combination with said protrusion of said shell and the upper and lower bumps of said liner form an interference fit between said shell and said liner such that the push-out force required to separate the shell from the liner is greater than the push-in force required to seat the liner in the shell.