MOBILE BEARING HIP ASSEMBLY AND METHOD OF PERFORMING AN ORTHOPAEDIC SURGICAL PROCEDURE

摘要

An acetabular hip implant includes an acetabular shell component, a first insert secured to the acetabular shell component, a second insert secured to the first insert, and a femoral head configured to be secured to the second insert. The first insert is permitted to rotate relative to the acetabular shell about a first axis, the second insert is permitted to rotate relative to the first insert about a second axis, and the femoral head is permitted to rotate relative to the second insert about a third axis. A method for performing an orthopaedic surgical procedure on an acetabulum of a patient is also disclosed.

主权项

1. An acetabular hip implant, comprising:
an acetabular shell component configured to be implanted within an acetabulum of a patient, the shell component having an inner surface that is partially spherical and having an axis, a first insert secured to the acetabular shell component and having an outer surface that is partially spherical such that the first insert is (i) permitted to rotate relative to the acetabular shell component about a first axis defined by the axis of shell component, and (ii) prevented from rotating relative to the acetabular shell component about second and third axes each of which is perpendicular to the first axis and to the other of the second and third axes, the first insert having a first pair of opposing flats which are parallel to one another and perpendicular to the second axis, a second insert secured to the first insert such that the outer surface of the second insert contacts the inner surface of the first insert, the second insert having a second pair of opposing flats defined in its outer surface which are parallel to one another and perpendicular to the second axis, each of the flats of the second pair contacting a respective flat of the first pair such that the second insert is (i) permitted to rotate relative to the first insert about the second axis, and (ii) prevented from rotating relative to the first insert about the first and third axes, the second insert having a third pair of opposing flats defined in its inner surface which are parallel to one another and perpendicular to the third axis, and a femoral head configured to be secured to a femoral stem, the femoral head being secured to the second insert such that the outer surface of the femoral head contacts the inner surface of the second insert, the femoral head having a fourth pair of opposing flats defined in its outer surface, each of the flats of the fourth pair contacting a respective flat of the third pair such that the femoral head is (i) permitted to rotate relative to the second insert about the third axis, and (ii) prevented from rotating relative to the second insert about the first and second axes, wherein the flats defined in inner surface of the first insert are provided on opposing sides of the first insert, the flats defined in the outer surface of the second insert are provided on opposing sides of the second insert, the flats defined in the inner surface of the second insert are provided on opposing sides of the second insert, and the flats defined in the outer surface of the femoral head are provided on opposing sides of the femoral head.