Toe implant assemblies, kits, surgical methods, and methods of manufacturing
A toe implant assembly includes a bearing member having a curved interface surface, and a fixation member having a platform portion and fixation portion. The platform portion has a peripheral portion sized less than or equal to a peripheral portion of the bearing member. The bearing member extends outwardly from the peripheral portion of the platform portion. A kit may include a plurality of differently sized sizing devices, at least one cannulated drill, and a plurality of correspondingly sized trialing devices having a bearing member and fixation member, the bearing member having a curved interface surface having a first diameter, and the fixation member is coupled to the bearing member. The fixation member has a platform having a peripheral diameter less than or equal to the diameter of the peripheral diameter of the bearing member. A surgical method includes using the kit to install a selected toe implant assembly.
1 . A toe implant assembly comprising:
a bearing member having a curved interface surface and a peripheral portion; and
a fixation member having a platform portion and fixation portion, the platform portion having a peripheral portion sized smaller than the peripheral portion of the bearing member;
the fixation member being coupled to the bearing member so that the peripheral portion of the bearing member extends outwardly from the peripheral portion of the platform portion;
the fixation portion comprising four raised portions, the raise portions defining four crisscrossed dovetail channels;
the bearing member comprising an integrally attached coupling portion, wherein the coupling portion of the bearing member includes four crisscrossed integrally attached raised coupling sections; and
wherein each one of the four coupling sections are configured to fit into a respective one of the dovetail channels to prevent translational movement of the bearing member relative to the fixation member.
2 . The toe implant assembly of claim 1 , wherein the fixation portion comprises a series of tapered cylindrical sections, wherein outer diameters of each cylindrical section are progressively smaller so that the fixation portion tapers from a bottom of the bearing member to a distal end of the fixation portion.
3 . The toe implant assembly of claim 2 , wherein each of the series of tapered cylindrical sections comprise an angled surface to facilitate insertion of the fixation portion into a bone.
4 . The toe implant assembly of claim 1 , wherein the fixation portion comprises an outer porous surface.
5 . The toe implant assembly of claim 4 , wherein the fixation portion comprises a hollow sleeve defining the outer porous surface.
6 . The toe implant assembly of claim 4 , wherein:
the platform portion of the fixation member comprises a first platform portion having a first peripheral portion and a second platform portion having a second peripheral portion sized less than the first peripheral portion, and
the peripheral portion of the bearing member extends around the platform portion of the fixation member with the first peripheral portion of the first platform being sandwiched therebetween.
7 . The toe implant assembly of claim 1 , wherein the bearing member comprises a periphery have a diameter between 14 mm and 22 mm.
8 . The toe implant assembly of claim 1 , wherein the bearing member comprises a polymer material, and the fixation member comprises a biocompatible metal.
9 . The toe implant assembly of claim 1 , wherein the curved interface surface comprises at least one of a concave surface and a convex surface.
10 . The toe implant assembly of claim 1 , wherein the fixation member comprises an end portion having an angular outer surface capable of preventing subsidence of the toe implant assembly into a patient's bone.
11 . The toe implant assembly of claim 1 , wherein the fixation member further comprises a distal tapered cylindrical portion, wherein the distal tapered cylindrical portion has an angular surface for facilitating a clearance when the toe implant assembly is inserted into the bone.
12 . The toe implant assembly of claim 1 , wherein the platform portion and the fixation portion are integrally connected to each other.
13 . The toe implant assembly of claim 12 , wherein the fixation portion comprises a proximal end and a distal end, wherein the platform portion and fixation portion are coupled together at the proximal end.
14 . The toe implant assembly of claim 1 , wherein the four raised portions extend a set distance from a proximal surface of the platform portion of the fixation member to facilitate the coupling of the bearing member to the fixation member.