Rim-bearing acetabular component of hip joint prosthesis
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United States of America Patent
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-
Jun 8, 1993
Issued Date -
N/A
app pub date -
May 15, 1991
filing date -
Aug 17, 1988
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An acetabular implant for a hip joint prosthesis comprising a metal cup shell (2) adapted to be secured in the acetabulum of a patient. The metal cup shell (2) has a hemispherical cavity (6) into which a liner may be inserted to provide a spherical bearing surface for the ball portion of the hip joint. Screws (26, 28) may be inserted through three apertures (20, 22 and 24) in the metal cup shell (2) into the ilium, ischium and pubic ramus of the patient. A continuous circumferential flange (8) is provided around the opening of the cavity (6). The flange (8) has an outside diameter which is at least 10% greater than the outside diameter of the remainder of the metal cup shell (2) at its widest point. The circumferential flange (8) provides a bearing surface (10) for contacting the rim (12) of the acetabulum of the patient when the metal cup shell (2) is fitted.
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