Stabilizing prosthesis support structure
First Claim
1. A support structure for use in conjunction with a prosthesis component, 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 platform outer periphery defining a platform medial-lateral width and a platform anteroposterior length; and
a medullary portion extending distally from said distal surface of said platform, 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; and
a 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 to a distal end opening at a distal end of the medullary portion, the medullary portion including a side wall with an interior surface situated along said longitudinal passage and an exterior surface opposite said interior surface for contacting bone upon implantation, the support structure providing at least a first open window that extends fully through the side wall from said interior surface to said exterior surface, said first open window including a distal window end that terminates proximal of the distal end of the medullary portion.
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Accused Products
Abstract
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.
151 Citations
22 Claims
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1. A support structure for use in conjunction with a prosthesis component, the support structure comprising:
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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 platform outer periphery defining a platform medial-lateral width and a platform anteroposterior length; and a medullary portion extending distally from said distal surface of said platform, 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; and a 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 to a distal end opening at a distal end of the medullary portion, the medullary portion including a side wall with an interior surface situated along said longitudinal passage and an exterior surface opposite said interior surface for contacting bone upon implantation, the support structure providing at least a first open window that extends fully through the side wall from said interior surface to said exterior surface, said first open window including a distal window end that terminates proximal of the distal end of the medullary portion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A proximal tibial implant system, comprising:
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a proximal tibial implant including a tibial baseplate with a proximal baseplate surface and a distal baseplate surface with a keel extending therefrom, said proximal tibial implant including at least a first fin extending down a side of the keel from the distal baseplate surface to a distal end of the keel; and a support structure for use in conjunction with the proximal tibial implant, the support structure formed with a porous bone-ingrowth metallic material and 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; and a 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; and a 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 to a distal end opening at a distal end of the medullary portion, said keel extending through the longitudinal passage and protruding from the distal end opening at the distal end of said medullary portion. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22)
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Specification