Stabilizing prosthesis support structure

摘要

A tibial support structure includes a platform portion and a medullary portion that are monolithically formed as a single piece. The medullary and platform portions of the augment component are adapted to accommodate and mechanically attach to a tibial baseplate, and are individually shaped and sized to replace damaged bone stock both within the tibia, as well at the tibial proximal surface. The monolithic formation of the tibial support structure provides a strong and stable foundation for a tibial baseplate and facilitates restoration of the anatomic joint line, even where substantial resections of the proximal tibia have been made. The tibial support structure may be made of a bone-ingrowth material which facilitates preservation and rebuilding of the proximal tibia after implantation, while also preserving the restored joint line by allowing revision surgeries to be performed without removal of the tibial support structure.

主权项

1. A proximal tibial implant system, comprising:
a proximal tibial implant including a tibial baseplate with a proximal baseplate surface and a distal baseplate surface with a keel extending therefrom, said keel having a length extending distally from said distal baseplate surface, said proximal tibial implant including at least a first fin extending down a side of the keel substantially along the length of the keel from the distal baseplate surface toward a distal end of the keel; and a support structure for use in conjunction with the proximal tibial implant, the support structure comprising:
a platform having a proximal surface and a distal surface defining a platform thickness therebetween, said proximal surface and said distal surface cooperating to define a platform outer periphery shaped to correspond with a periphery of a resected proximal tibia, said periphery divided into a medial side and an opposing lateral side, said platform outer periphery defining a platform medial-lateral width and a platform anteroposterior length; anda medullary portion extending distally from said distal surface of said platform and from at least one of said medial side and said lateral side, said medullary portion monolithically formed with said platform and comprising:
a medullary portion anteroposterior diameter less than said platform anteroposterior length;a medullary portion medial-lateral diameter less than said platform medial-lateral width; anda medullary portion height measured along a proximal/distal extent of said medullary portion, wherein the support structure provides a longitudinal passage that extends through the support structure from a proximal end opening in the proximal surface of the platform toward a distal end of the medullary portion, said keel positioned in the longitudinal passage.