Joint instrumentation and associated methods of use
A trial implant is provided. The implant includes a central portion. The central portion includes a top articulating surface extending between a first end and a second end and having a convex shape, a bottom surface configured to at least partially contact a first resected surface of a bone, and a first side surface extending between the top articulating surface and the bottom surface. The first side surface is sloped such that a width of the top articulating surface is greater than a width of the bottom surface. The implant further includes a first outer portion extending laterally from the central portion. The first side surface and the first outer portion are separated by a first opening shaped such that up to four resected surfaces of the bone are visible when the trial implant is seated on the bone.
1. A trial implant, comprising:
a central portion, comprising:
a top articulating surface extending between a first end and a second end and having a convex shape,
a bottom surface configured to at least partially contact a first resected surface of a bone, and
a first side surface extending between the top articulating surface and the bottom surface, the first side surface being sloped such that a width of the top articulating surface is greater than a width of the bottom surface; and
a first outer portion extending laterally from the central portion,
wherein the first side surface and the first outer portion are separated by a first opening shaped such that up to four resected surfaces of the bone are visible when the trial implant is seated on the bone.
2. The trial implant of claim 1 , wherein the trial implant includes a second opening.
3. The trial implant of claim 2 , wherein the second opening is smaller than the first opening.
4. The trial implant of claim 1 , wherein the first outer portion extends laterally from the central portion such that the first outer portion is entirely on one side of a plane through the first side surface.
5. The trial implant of claim 1 , wherein the first outer portion forms a perimeter around the central portion.
6. The trial implant of claim 1 , wherein at least the central portion and the first outer portion are monolithic.
7. The trial implant of claim 1 , wherein a width of the top articulating surface of the central portion and a width of the bottom surface of the central portion are each greater than a height of the first side surface of the central portion.
8. The trial implant of claim 1 , wherein the first outer portion comprises:
a top surface that faces a same direction as the top articulating surface of the central portion;
a bottom surface that faces a same direction as the bottom surface of the central portion; and
a side surface.
9. The trial implant of claim 8 , wherein a width of the top surface of the first outer portion and a width of the bottom surface of the first outer portion are each greater than a height of the side surface of the first outer portion.
10. The trial implant of claim 1 , wherein at least a portion of the bottom surface of the first outer portion extends below the bottom surface of the central portion.
11. The trial implant of claim 1 , wherein the top articulating surface of the central portion comprises a first top surface, a second top surface laterally spaced from the first top surface, and a ridge separating the first top surface from the second top surface.
12. The trial implant of claim 1 , wherein the bottom surface of the central portion comprises a post configured for placement in a hole through the first resected surface of the bone.
13. The trial implant of claim 1 , wherein the bone is a talar bone of an ankle of a patient.
14. The trial implant of claim 1 , further comprising a second outer portion extending laterally from the central portion such that the central portion separates the second outer portion from the first outer portion and a second opening separates the central portion from the second outer portion.
15. The trial implant of claim 14 , further comprising a third opening through the central portion, the third opening having a long dimension transverse to a long dimension of the second opening.
16. The trial implant of claim 14 , wherein the first outer portion has a first shape and the second outer portion has a second shape different from the first shape.
17. The trial implant of claim 14 , wherein the second outer portion has a substantially uniform thickness.
18. The trial implant of claim 14 , wherein a bottom surface of the second outer portion does not extend below the bottom surface of the central portion.
19. The trial implant of claim 14 , wherein the second outer portion extends laterally from the central portion such that the second outer portion is entirely on one side of a plane through a second side surface of the central portion.
20. The trial implant of claim 19 , wherein the second side surface of the central portion has a different slope from the first side surface of the central portion.