Rim-bearing acetabular component of hip joint prosthesis

Claim 1

A kit for use in a hip joint prosthesis comprising, in combination, an acetabular implant comprising a metal cup shell adapted to be secured in the acetabulum of a patient, the metal cup shell defining a generally hemispherical cavity having an opening into which a liner may be inserted to provide a spherical bearing surface for the ball portion of the hip joint, the metal cup shell comprising walls defining three apertures positioned for insertion therethrough of screws into the ilium, ischium and pubic ramus of the patient, and a continuous circumferential flange extending generally radially outwardly adjacent the opening of the cavity, the flange having an outside diameter that is from 10 to 40 percent greater than the out side diameter of the remainder of the metal cup shell at its widest point, the circumferential flange providing a bearing surface adapted for contacting a rim of the acetabulum of the patient when the metal cup shell is fitted; and a reaming tool comprising a blade for shaving the rim of the acetabulum; and a guide comprising an insert having an arcuate end surface, said guide having walls defining three holes positioned at guide screws through the three apertures of the metal cup shell and into the ilium, ischium and pubic ramus of the patient.