Tibial prosthesis with tibial bearing component securing feature

Patent metadata

Field	Value
Publication number	US-10675153-B2
Application number	US-201815915886-A
Country	US
Kind code	B2
Filing date	Mar 8, 2018
Priority date	Mar 10, 2017
Publication date	Jun 9, 2020
Grant date	Jun 9, 2020

Abstract

According to one example, a tibial prosthesis that can include a tibial bearing component, tibial baseplate, an insert and a fastener. The tibial bearing component can have medial and lateral proximal articular surfaces and an opposing distal surface. The tibial bearing component can define at least one recess therein with the recess having an opening at a periphery of the tibial bearing component. The tibial baseplate can be coupled to the tibial bearing component on the proximal surface thereof and having a distal surface configured to be disposed on a resected proximal surface of a tibia. The insert can be configured to be disposed within the recess and can engage the tibial baseplate and the tibial bearing component. The fastener can be insertable into the tibial bearing component and can be configured to retain the insert to the tibial baseplate.

First claim

The claimed invention is:

1. A tibial prosthesis for a knee arthroplasty comprising:
a tibial bearing component having medial and lateral proximal articular surfaces and an opposing distal surface, wherein the tibial bearing component defines at least one recess therein with the at least one recess having an opening at a periphery of the tibial bearing component;
a tibial baseplate coupled to the tibial bearing component on a proximal surface thereof and having a distal surface configured to be disposed on a resected proximal surface of a tibia;
an insert configured to be disposed within the at least one recess and engage the tibial baseplate and the tibial bearing component wherein the insert comprises:
a body having an aperture defined thereby;
a first foot connected to the body and extending distal therefrom, the first foot having a first side surface engaging the tibial baseplate; and
a second foot connected to the body and extending distal therefrom, the second foot spaced from the first foot and having a second side surface engaging the tibial baseplate; and

a fastener having a head, the aperture of the body receives the head of the fastener, wherein the fastener retains the insert to the tibial baseplate.

2. The tibial prosthesis of claim 1 , wherein the tibial bearing component comprises a posterior-stabilized tibial bearing component with a spine disposed between the medial and lateral proximal articular surfaces.

3. The tibial prosthesis of claim 1 , wherein the insert further comprises a tab extending proximally from the body, the tab engaging the tibial bearing component to retain the insert within the tibial bearing component.

4. The tibial prosthesis of claim 1 , wherein the body includes a first wing that extends lateral of the first foot and a second wing that extends medial of the second foot.

5. The tibial prosthesis of claim 1 , wherein the head of the fastener and the aperture share a similar curvature such the fastener is self-centering within the insert.

6. The tibial prosthesis of claim 1 , wherein the tibial baseplate includes a rail extending from the proximal surface along a periphery thereof, wherein the rail has a gap in a region of the at least one recess, and wherein with the insert disposed in the at least one recess, at least a portion thereof extends into the gap and engages the rail to limit micro-motion of the tibial bearing component.

7. The tibial prosthesis of claim 1 , further comprising a second aperture formed in the tibial bearing component and extending from between the medial and lateral proximal articular surfaces to communicate with the at least one recess, wherein the second aperture is configured to receive at least a portion of the fastener, and wherein the second aperture is angled relative to a proximal-distal axis of the tibial bearing component such that second aperture extends both proximal-distal and anterior-posterior.

8. A tibial prosthesis for a knee arthroplasty comprising:
a tibial bearing component having medial and lateral proximal articular surfaces and an opposing distal surface, wherein the tibial bearing component defines at least one recess therein with the at least one recess having an opening at a periphery of the tibial bearing component;
a tibial baseplate coupled to the tibial bearing component on a proximal surface thereof and having a distal surface configured to be disposed on a resected proximal surface of a tibia;
an insert configured to be disposed within the recess and engage the tibial baseplate and the tibial bearing component; and
a fastener retaining the insert to the tibial baseplate, wherein the opening is at an anterior portion of the periphery of the tibial bearing component and the insert is disposed in the at least one recess such that substantially an entirety of the insert is disposed anterior of the fastener.

9. A system for use in a knee arthroplasty comprising:
a tibial bearing component having medial and lateral proximal articular surfaces and an opposing distal surface, wherein the tibial bearing component defines at least one recess therein with the at least one recess having an opening at a periphery of the tibial bearing component, wherein the tibial bearing component defines a first aperture that extends from between the medial and lateral proximal articular surfaces to communicate with the at least one recess;
a tibial baseplate configured to receive the tibial bearing component on a proximal surface thereof and having a distal surface configured to be disposed on a resected proximal surface of a tibia;
an insert disposable through the opening and into the at least one recess, the insert configured to engage the tibial baseplate and the tibial bearing component when the insert, the tibial baseplate and the tibial beating component are assembled together; and
a fastener insertable into the tibial bearing component and configured to retain the insert to the tibial baseplate;
wherein the first aperture is configured to receive at least a portion of the fastener, and wherein the first aperture is angled relative to a proximal-distal axis of the tibial bearing component such that first aperture extends both proximal-distal and anterior-posterior.

10. The system of claim 9 , wherein the tibial bearing component comprises a posterior-stabilized tibial bearing component with a spine disposed between the medial and lateral proximal articular surfaces, and wherein the fastener is insertable into an anterior portion of the spine.

11. The system of claim 9 , wherein the insert comprises:
a body having a second aperture defined thereby, the second aperture configured to receive a head of the fastener;
a first foot extending generally distal from the body and having a first side surface engaging the tibial baseplate; and
a second foot extending generally distal from the body and spaced from the first foot, the second foot having a second side surface engaging the tibial baseplate.

12. The system of claim 11 , wherein the insert further comprises a tab extending proximally from the body and configured to engage the tibial bearing component to retain the insert within the tibial bearing component.

13. The system of claim 11 , wherein the body includes a first wing that extends lateral of the first foot and a second wing that extends medial of the second foot.

14. The system of claim 12 , wherein the head of the fastener and the second aperture share a similar curvature such the fastener is self-centering within the insert.

15. The system of claim 9 , wherein the opening is at an anterior portion of the periphery of the tibial bearing component and the insert is disposed in the at least one recess when assembled such that substantially an entirety of the insert is disposed anterior of the fastener.

16. The system of claim 9 , wherein the tibial baseplate includes a rail extending from the proximal surface along a periphery thereof, wherein the rail has a gap in a region of the at least one recess and forms a part of the opening, and wherein with the insert disposed in the gap the insert is configured to engage the rail to limit micro-motion of the tibial bearing component.

Assignees

• Zimmer Inc

Inventors

• Byrd Brian D
• Macke Kathleen
• Todd Dwight T
• Wernle James D
• Croll Vanessa
• Blaylock Jeff
• Habegger Abraham P

Classifications

• A61F2/389 Primary

  Tibial components (A61F2/3868 takes precedence) · CPC title

• A61F2002/30476

  locked by an additional locking mechanism · CPC title

• A61F2/3886

  for stabilising knees against anterior or lateral dislocations · CPC title

• A61F2002/30433

  using additional screws, bolts, dowels, rivets or washers e.g. connecting screws · CPC title

• A61F2002/30401

  with additional means for preventing or locking said sliding · CPC title