Implant component
A femoral implant component for an orthopaedic implant for knee arthroplasty, the femoral implant component includes an articulation portion including a main body having a porous structure; a solid peripheral portion comprising an articulation surface, the solid peripheral portion forming a periphery of the main body, the articulation surface being configured to articulate relative to a tibial component of the orthopaedic implant or to native anatomy, when in use; the femoral implant component including a fixing portion, the fixing portion being configured to fix the implant component to a femur of a patient; wherein the fixing portion and the articulation portion are unitary and comprise fused particles.
1 . An unicompartmental femoral implant component for an orthopaedic implant for partial knee arthroplasty, the unicompartmental femoral implant component comprising:
an articulation portion and a fixing portion,
wherein the articulation portion comprises:
a main body having a lattice structure, the lattice structure comprising a plurality of struts connected at nodes; and
a non-porous solid peripheral portion comprising an articulation surface, the non-porous solid peripheral portion forming a periphery of the main body, the articulation surface being configured to articulate relative to a tibial component of the orthopaedic implant or to native anatomy, when in use;
wherein the fixing portion extends from a surface of the main body, the fixing portion being configured to fix the unicompartmental femoral implant component to a femur of a patient, the fixing portion comprising one or more pegs each comprising an internal volume and a solid tip, the internal volume of each of the one or more pegs comprising a porous structure that forms at least part of the internal volume of the peg, wherein the porous structure is a lattice structure comprising a plurality of struts connected at nodes;
wherein the fixing portion is monolithically formed with the articulation portion by additive manufacturing;
wherein the fixing portion and the articulation portion comprise fused particles;
wherein the non-porous solid peripheral portion forms a shell to the main body, such that the main body occupies a cavity defined by the non-porous solid peripheral portion; and
wherein the solid tip surrounds a part of the porous structure at a tip of the peg.
2 . The femoral implant component according to claim 1 , wherein the lattice structure of the one or more pegs is integral with the lattice structure of the main body.
3 . The femoral implant component according to claim 1 , comprising a coating disposed on at least part of the fixing portion, the coating being of a different material to the fixing portion.
4 . The femoral implant component according to claim 1 , wherein the main body of the articulation portion comprises a superior surface of the articulation portion, the lattice structure of the main body comprising at least part of the superior surface of the main body.
5 . The femoral implant component according to claim 1 , wherein the lattice structure has a bulk elastic modulus of between 0.1 Gigapascals (GPa) and 5 GPa.
6 . The femoral implant component according to claim 5 , wherein the lattice structure has a porosity of between 5% and 30%.
7 . The femoral implant component according to claim 6 , wherein the lattice structure has a strut density of between 2 and 7 struts per cubic millimeter.
8 . The femoral implant component according to claim 7 , wherein each strut has a thickness of between 100 microns and 400 microns.