Motion facilitating tibial components for a knee prosthesis

• US 10,413,415 B2
• Filed: 09/13/2017
• Issued: 09/17/2019
• Est. Priority Date: 09/10/2010
• Status: Active Grant

• Current Assignee: Zimmer Incorporated (Zimmer Biomet Holdings, Inc.)
• Original Assignee: Zimmer Incorporated (Zimmer Biomet Holdings, Inc.)
• Inventors: Parisi, Raymond C., Rettig, Katherine M., Blaylock, Jeff
• Primary Examiner(s): Dukert, Brian A
• Application Number:
  US15/703,692
• Publication Number:
  US 20180021143A1
• Time in Patent Office: 734 Days
• CPC Class Codes: A61F 2/3868 with sliding tibial bearing
• CPC Class Codes: A61F 2/3886 for stabilising knees against anterior or lateral dislocations
• CPC Class Codes: A61F 2/389 Tibial components A61F2/3868 takes precedence
• CPC Class Codes: A61F 2002/30387 Dovetail connection
• CPC Class Codes: A61F 2002/30616 Sets comprising a plurality of prosthetic parts of different sizes or orientations
• CPC Class Codes: A61F 2220/0033 made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit

Abstract

An orthopaedic tibial prosthesis includes a tibial baseplate sized and shaped to cover substantially all of a resected proximal tibial surface, and a tibial bearing component sized to leave a posteromedial portion of the tibial baseplate exposed when the tibial bearing component is mounted to the baseplate. The exposed posteromedial portion of the tibial baseplate includes a chamfered profile which cooperates with a correspondingly chamfered profile at a posteromedial edge of the tibial bearing component to create a substantially continuous chamfer extending from the resected tibial surface to the medial articular surface of the tibial bearing component. Advantageously, this chamfer leaves an absence of material (i.e., a relief or void) at the posteromedial edge of the tibial prosthesis, thereby enabling deep flexion of the prosthesis without impingement between the tibial prosthesis and adjacent anatomic tissues or prosthetic structures.

Claims

1. A tibial prosthesis comprising:

a beating component comprising;

a bearing distal surface;

an opposing bearing proximal surface defining a lateral articular surface and a medial articular surface; and

a bearing peripheral wall disposed between the bearing distal and proximal surfaces; and

a baseplate configured to couple to the bearing component, the baseplate comprising;

a baseplate distal surface configured for contacting a bone surface;

an opposing baseplate proximal surface having a medial compartment and a lateral compartment, the bearing component mountable to the tibial baseplate; and

a baseplate peripheral wall disposed between the baseplate proximal and distal surfaces, the baseplate peripheral wall including a baseplate medial-posterior wall extending distally and posteriorly toward the baseplate distal surface;

wherein the baseplate medial-posterior wall extends in a posterior direction beyond a posterior medial edge of the bearing component such that a posterior most portion of the baseplate medial-posterior wall does not interface with the beating component and is exposed when the baseplate is coupled to the bearing component, wherein the bearing peripheral wall includes a bearing medial-posterior chamfer extending distally and posteriorly from the medial articular surface toward the bearing distal surface.

2. The tibial prosthesis of claim 1, wherein the baseplate medial-posterior wall comprises a baseplate chamfer, and wherein the baseplate chamfer extends across less than an entirety of a proximal/distal distance of the baseplate medial-posterior wall.

3. The tibial prosthesis of claim 1, wherein the baseplate medial-posterior wall comprises a baseplate chamfer, and wherein the baseplate chamfer extends across substantially an entirety of a proximal/distal distance of the baseplate medial-posterior wall.

4. The tibial prosthesis of claim 1, wherein the baseplate medial-posterior wall comprises a baseplate chamfer, and wherein the baseplate chamfer defines one of an arcuate profile or a linear profile.

5. The tibial prosthesis of claim 1, wherein the baseplate medial-posterior wall comprises a baseplate chamfer, and wherein the bearing medial-posterior chamfer and the baseplate chamfer form one of a substantially continuous or a substantially discontinuous chamfer that extends proximally and anteriorly substantially from a posterior-medial edge of the baseplate to substantially the medial articular surface.

6. The tibial prosthesis of claim 1, wherein the baseplate medial-posterior wall and the bearing peripheral wall at a medial-posterior section are configured to cooperate to create a relief from a femur when implanted such that there is a space between the femur and both baseplate medial-posterior wall and the bearing peripheral wall at the medial-posterior section when the femur is in a deep flexion orientation with respect to the tibial prosthesis.

7. The tibial prosthesis of claim 1, wherein a medial portion of the bearing component is biased anteriorly relative to a lateral portion such that the baseplate medial-posterior wall is exposed, and wherein the lateral articular surface substantially completely covers a lateral compartment and extends further posterior than the medial articular surface.

8. The tibial prosthesis of claim 1, wherein the bearing component comprises a recess formed between the bearing peripheral wall and the bearing distal surface, and the baseplate includes a projection configured to engage with the recess when the bearing component is mounted to the tibial baseplate.

9. A tibial prosthesis comprising:

a bearing component comprising;

a beating distal surface;

an opposing bearing proximal surface defining a lateral articular surface and a medial articular surface; and

a bearing peripheral wall disposed between the bearing distal and proximal surfaces; and

a baseplate configured to couple to the bearing component, the baseplate comprising;

a baseplate distal surface configured for contacting a bone surface;

an opposing baseplate proximal surface having a medial compartment and a lateral compartment, the bearing component mountable to the tibial baseplate; and

a baseplate peripheral wall disposed between the baseplate proximal and distal surfaces, the baseplate peripheral wall including a baseplate medial-posterior wall extending distally and posteriorly toward the baseplate distal surface;

wherein the baseplate medial-posterior wall extends in a posterior direction beyond a posterior medial edge of the bearing component, wherein the baseplate medial-posterior wall and the bearing peripheral wall at a medial-posterior section together extend proximally and anteriorly substantially from a posterior-medial edge of the baseplate to substantially the medial articular surface to create a relief from a femur when implanted such that there is a space between the femur and both baseplate medial-posterior wall and the bearing peripheral wall at the medial-posterior section when the femur is in a deep flexion orientation with respect to the tibial prosthesis.

10. The tibial prosthesis system of claim 9, wherein a posterior most portion of the baseplate medial-posterior wall does not interface with the bearing component and is exposed when the baseplate is coupled to the bearing component.

11. The tibial prosthesis of claim 9, wherein the baseplate medial-posterior wall comprises a baseplate chamfer, and wherein the baseplate chamfer extends across less than an entirety of a proximal/distal distance of the baseplate medial-posterior wall.

12. The tibial prosthesis of claim 9, wherein the baseplate medial-posterior wall comprises a baseplate chamfer, and wherein the baseplate chamfer extends across substantially an entirety of a proximal/distal distance of the baseplate medial-posterior wall.

13. The tibial prosthesis of claim 9, wherein the baseplate medial-posterior wall comprises a baseplate chamfer, and wherein the baseplate chamfer defines one of an arcuate profile or a linear profile.

14. The tibial prosthesis of claim 9, wherein the bearing peripheral wall includes a bearing medial-posterior chamfer extending distally and posteriorly from the medial articular surface toward the bearing distal surface.

15. The tibial prosthesis of claim 14, wherein the baseplate medial-posted or wall comprises a baseplate chamfer, and wherein the bearing medial-posterior chamfer and the baseplate chamfer form a substantially continuous chamfer that extends proximally and anteriorly substantially from the posterior-medial edge of the baseplate to substantially the medial articular surface.

16. The tibial prosthesis of claim 9, wherein a medial portion of the bearing component is biased anteriorly relative to a lateral portion such that the baseplate medial-posterior wall is exposed, and wherein the lateral articular surface substantially completely covers a lateral compartment and extends further posterior than the medial articular surface.

17. A tibial prosthesis comprising:

a beating component comprising;

a bearing distal surface;

an opposing bearing proximal surface defining a lateral articular surface and a medial articular surface; and

a bearing peripheral wall disposed between the bearing distal and proximal surfaces; and

a baseplate configured to couple with the bearing component, the baseplate comprising;

a baseplate distal surface configured for contacting a bone surface;

an opposing baseplate proximal surface having a medial compartment and a lateral compartment, the bearing component mountable to the tibial baseplate; and

a baseplate peripheral wall disposed between the baseplate proximal and distal surfaces, the baseplate peripheral wall including a baseplate medial-posterior wall extending distally and posteriorly toward the baseplate distal surface;

wherein the baseplate medial-posterior wall extends in a posterior direction beyond a posterior medial edge of the bearing component, wherein a medial portion of the bearing component is biased anteriorly relative to a lateral portion such that the baseplate medial-posterior wall is exposed, and wherein the lateral articular surface substantially completely covers a lateral compartment and extends further posterior than the medial articular surface.

18. The tibial prosthesis of claim 17, wherein the baseplate medial-posted or wall and the bearing peripheral wall at a medial-posterior section together extend proximally and anteriorly substantially from a posterior-medial edge of the baseplate to substantially the medial articular surface to create a relief from a femur when implanted such that there is a space between the femur and both baseplate medial-posterior wall and the bearing peripheral wall at the medial-posterior section when the femur is in a deep flexion orientation with respect to the tibial prosthesis.

19. The tibial prosthesis of claim 17, wherein the baseplate medial-posterior wall comprises a baseplate chamfer, wherein the bearing peripheral wall includes a bearing medial-posterior chamfer extending distally and posteriorly from the medial articular surface toward the bearing distal surface, and wherein the bearing medial-posterior chamfer and the baseplate chamfer form one of a substantially continuous or a discontinuous chamfer that extends proximally and anteriorly substantially from the posterior-medial edge of the baseplate to substantially the medial articular surface.