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AssigneeDepuy (Ireland)
InventorsStephanie M. Deruntz, Daren L. Deffenbaugh, Hengda D. Liu, Andrew J. Martin, Jeffrey A. Rybolt, Bryan J. Smith, Anthony D. Zannis
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A joint prosthesis system is suitable for cementless fixation. The system has two metal implant components and a bearing. One of the metal implant components has an articulation surface for articulation with the bearing. The other metal implant component has a mounting surface for supporting the bearing. One of the metal implant components includes a solid metal portion and a porous metal portion. The porous metal portion has surfaces with different characteristics, such as roughness, to improve bone fixation, ease removal of the implant component in a revision surgery, reduce soft tissue irritation, improve the strength of a sintered bond between the solid and porous metal portions, or reduce or eliminate the possibility of blood traveling through the porous metal portion into the joint space. A method of making the joint prosthesis is also disclosed. The invention may also be applied to discrete porous metal implant components, such as augment.
An orthopaedic implant component comprising a porous metal body having an exposed bone-engaging surface and a second exposed surface extending from the exposed bone-engaging surface, the porous metal body having a central longitudinal axis intersecting the second exposed surface and centered between opposite portions of the exposed bone-engaging surface, wherein the exposed bone-engaging surface has a static coefficient of friction and the second exposed surface has a lower static coefficient of friction, the porous metal body has a thickness at the exposed bone-engaging surface between opposite portions of the exposed bone-engaging surface, the thickness being in a direction transverse to the central longitudinal axis of the porous metal body, the entire thickness of the porous metal body comprises porous metal so that the central longitudinal axis of the porous metal body extends through porous metal, wherein the porous metal body has a void space of about 60%-85% by volume across the thickness at the exposed bone engaging surface, and wherein the implant component comprises a tibial tray, the implant component further includes a solid metal support portion having a proximal surface and a distal surface, the distal surface having a recess, the porous metal body comprises an extension having a proximal end received in the recess of the solid metal support and extending distally from the solid metal support to a free distal end, the free distal end of the extension defines the second exposed surface of the porous metal body;
Dependencies are inferred from the claim text.