Dual mobility acetabular implant for hip revision surgery
AssigneesSmith & Nephew, Inc., Smith & Nephew Orthopaedics AG, Smith & Nephew Asia Pacific Pte. Limited
InventorDavid W. Rister
Life of this patent
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Abstract
An insert (240) arranged and configured for use in a dual mobility acetabular implant (100) is disclosed. The insert includes a plurality of chamfers (260, 262, 264) arranged and configured to contact the femoral neck (172) and/or head (170) of a femoral implant (175). The insert includes a plurality of chamfers such as, for example, two or three chamfers to define a plurality of differently arranged contact surfaces for contacting the femoral component to accommodate a variety of different femoral component configurations and/or impingement conditions in order to reduce contact stress between the insert and the femoral component.
Claims8
A dual mobility acetabular implant comprising:
- an acetabular cup arranged and configured to be positioned within a patient's acetabulum, the acetabular cup including a body having an interior cavity;
- a liner arranged and configured to be inserted into the interior cavity of the acetabular cup, the liner including a body having an interior cavity;
- and
- an insert arranged and configured to be inserted into the interior cavity of the liner, the insert including a body extending from an annular rim to a polar end, the body including an interior cavity, a convex exterior surface arranged and configured to articulate relative to an inner surface of the interior cavity of the liner, and a concave interior surface arranged and configured to receive and articulate relative to an outer surface of a femoral head;
- wherein the annular rim of the insert includes a plurality of chamfers defining multiple contact surfaces for contacting a portion of a femoral neck, wherein the plurality of chamfers comprise first, second, and third chamfers defining first, second, and third distinct contact surfaces, each of the first, second, and third distinct contact surfaces arranged and configured to contact the femoral neck.
Dependencies are inferred from the claim text.