Multiple bearing acetabular prosthesis

摘要

An acetabular prosthesis assembly can include an acetabular cup and a first liner. The acetabular cup can have an outer surface to contact a subject and an inner surface to engage the first liner. The first liner can have an outer cup engaging surface that couples with the acetabular cup in an assembled position.

主权项

1. An acetabular prosthesis assembly comprising:
an acetabular cup having an outer bone engaging surface, an inner liner engaging surface, and a cup upper rim extending between the outer bone engaging surface and the inner liner engaging surface, wherein a cup connection portion is formed at an upper rim, the cup connection portion including a groove extending radially in the upper rim from the outer bone engaging surface to the inner liner engaging surface; and a first liner having an outer cup engaging surface, a liner upper rim, and a liner connection portion that includes a finger that extends near the liner upper rim and away from the outer cup engaging surface, wherein the finger is received in a cutout of the groove of the cup connection portion of the acetabular cup in an assembled position, wherein the finger includes first and second protrusions extending from opposing sides of the finger and the finger is symmetrical about an axis extending through the finger and generally perpendicular to the liner upper rim, wherein the first and second protrusions are compressible as the first liner is moved into the assembled position, relative to the acetabular cup, and expandable into the cutout of the groove once the first liner is in the assembled position, wherein the groove includes a ramp surface extending from the cup upper rim and angling towards the cutout within the groove, and wherein the ramp surface is configured to compress the protrusion as the first liner is moved into the assembled position.