Augmenting an acetabular implant site

摘要

A method and an acetabular augment are disclosed for compensating for a deficiency encountered in natural bone at an implant site wherein an acetabular component of a prosthetic hip implant is to be implanted within a prepared acetabulum during a hip arthroplasty. A buttress member of an acetabular augment is placed at a selected angular position relative to an affixation member of the acetabular augment, as determined by a trialing procedure in which a trial buttress member is placed at the deficiency while a trial affixation member is placed upon natural bone at the implant site to determine a trial relative angular position between the trial buttress member and the trial affixation member of a trial acetabular augment located at the implant site. The relative angular position between the buttress member and the affixation member then is selected to mimic the trial relative angular position. The location of the trial acetabular augment is marked, and the trial acetabular augment is removed. The acetabular augment then is secured in place at the implant site, at the marked location, to mimic the location of the trial acetabular augment and place the buttress member at the deficiency, with the affixation member placed upon natural bone at the implant site.

主权项

1. An acetabular augment for compensating for a deficiency encountered in natural bone available at an implant site wherein, during a hip arthroplasty, the available natural bone is prepared so as to establish a prepared acetabulum for the reception of a conventional acetabular component having an outer surface with a conventional outer surface contour configuration, the prepared acetabulum having a contour configuration that extends along an acetabular envelope having a contour configuration complementary to the outer surface contour configuration of the conventional acetabular component and including a portion spaced from the available natural bone as a result of the encountered deficiency, the acetabular augment comprising:
a buttress member having a buttress surface with a surface contour configuration complementary to the portion of the acetabular envelope spaced from the available natural bone; an affixation member having an affixation surface for affixing the affixation member to natural bone adjacent the prepared acetabulum; and a coupling arrangement for coupling the buttress member with the affixation member, affixed permanently at any selected one of a plurality of fixed angular positions relative to one another, the coupling arrangement including complementary coupling elements on the buttress member and on the affixation member for selective engagement to permanently affix the buttress member to the affixation member against movement of the buttress member relative to the affixation member when the buttress member and the affixation member are coupled at a selected one of the plurality of fixed angular positions, with the affixation surface permanently located at a corresponding selected angular position relative to the buttress surface so as to place the buttress surface in permanent secured juxtaposition with the acetabular envelope upon affixation of the affixation surface to the natural bone adjacent the prepared acetabulum, whereby the buttress surface will be located permanently to supplement the natural bone available at the prepared acetabulum for reception of the conventional acetabular component at the prepared acetabulum, with the outer surface of the acetabular component extending along the acetabular envelope, and the acetabular component supported by the available natural bone and the permanently secured buttress surface.