Bone implant with struts
An implant includes a component for fixed attachment to a bone. An underpass layer of a porous material is disposed on a first side of the component for fixed attachment. At least one strut is provided on the underpass layer. The at least one strut has a first surface contacting the underpass layer and a second surface opposite the first surface. The at least one strut comprises a non-porous material. An additional layer of the porous material fills a respective volume adjacent the at least one strut. The additional layer extends from a first side of the underpass layer to a predetermined height at or above the second surface of the at least one strut.
1. An implant comprising:
a tibial tray having a porous underpass layer disposed on a tibia facing side for fixed attachment;
at least one non-porous strut on the porous underpass layer, having a first surface in contact with the porous underpass layer and a second surface spaced-away from the first surface; and
a layer of the porous material located adjacent the at least one strut and extending from a first side of the porous underpass layer with a height no more than a height of the second surface of the at least one strut.
2. The implant of claim 1 , wherein the tibial tray comprises a tibial insert having an articulating surface.
3. An implant comprising:
a talar plate having a porous underpass layer disposed on a talar facing side for fixed attachment;
at least one non-porous strut on the porous underpass layer, having a first surface in contact with the porous underpass layer and a second surface spaced-away from the first surface; and
a layer of the porous material located adjacent the at least one strut and extending from a first side of the porous underpass layer with a height no more than a height of the second surface of the at least one strut.
4. The implant of claim 1 or 3 , wherein the porous material and the non-porous material have a uniform composition.
5. The implant of claim 1 , wherein the tibial tray has a length and each of the at least one strut has a length less than the length of the tibial tray.
6. The implant of claim 1 , further comprising at least one peg extending in a superior direction from a respective at least one strut, the peg having a non-porous interior and a porous exterior surface.
7. The implant of claim 6 , wherein the at least one strut has an undulating configuration.
8. The implant of claim 1 , wherein the at least one strut has a cross-section that is wider at an inferior surface of a strut than at a superior surface of a strut.
9. The implant of claim 1 or 3 , wherein a thickness of the porous underpass layer is greater than a distance between a superior surface of each at least one strut and a superior surface of a porous layer adjacent to at least one strut.
10. The implant of claim 1 , wherein the superior surface of the porous layer covers the entire superior side of the tibial component.
11. The implant of claim 1 or 3 , wherein the porous material in the underpass layer is shaped into at least one strip extending perpendicular to a longitudinal direction of the one or more struts.
12. The implant of claim 11 , wherein the at least one strip extends beneath all of the struts.
13. The implant of claim 1 or 3 , wherein the talar dome has a sulcus, and the at least one strut is located adjacent to the sulcus.
14. The implant of claim 3 wherein the implant comprises a removable talar dome having an articulating surface.