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Method and apparatus for use of porous implants

  • US 8,197,550 B2
  • Filed: 09/14/2009
  • Issued: 06/12/2012
  • Est. Priority Date: 04/21/2005
  • Status: Active Grant
First Claim
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1. An acetabular cup for implantation into an acetabulum of a patient, the acetabular cup comprising:

  • an integrally formed shell having an outer hemispherical portion comprising a first porous metal layer adapted to receive bone ingrowth after implantation, an inner hemispherical portion comprising a second porous metal layer; and

    a thin solid metal intermediate hemispherical portion defining a non-porous and continuous barrier between said outer and inner hemispherical portions;

    at least one bone screw adapted to be intra-operatively inserted through the shell from the inner portion to the outer portion, the at least one bone screw adapted to pierce the barrier; and

    a bearing liner affixed to the inner portion;

    wherein the barrier inhibits wear debris particles from migrating from the inner portion to the outer portion;

    wherein the outer portion defines a radial rim, wherein the intermediate portion includes an annular collar affixed around the radial rim;

    wherein the intermediate portion has a thickness less than 50% of either of a thickness of the inner portion and a thickness of the outer portion;

    wherein the porosity of the first porous metal layer is distinct from the porosity of the second porous metal layer.

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