Orthopaedic knee prosthesis having controlled condylar curvature

Patent metadata

Field	Value
Publication number	US-9539099-B2
Application number	US-201414309466-A
Country	US
Kind code	B2
Filing date	Jun 19, 2014
Priority date	Jun 30, 2008
Publication date	Jan 10, 2017
Grant date	Jan 10, 2017

Abstract

An orthopedic knee prosthesis includes a femoral component having a condyle surface. The condyle surface is defined by one or more radii of curvatures, which are controlled to reduce or delay the onset of anterior translation of the femoral component relative to a tibial bearing.

First claim

The invention claimed is:

1. An orthopaedic knee prosthesis comprising:
a femoral component having a condyle surface curved in the sagittal plane, wherein the condyle surface is configured to contact a bearing surface of a tibial bearing at (i) a first contact point on the condyle surface at a first degree of flexion in a range of −10 degrees to 0 degrees, and (ii) a second contact point on the condyle surface at a second degree of flexion greater than 90 degrees,
wherein the condyle surface in the sagittal plane between the first contact point and the second contact point is defined by at least five curved surface sections, and each curved surface section having a radius of curvature that extends from an origin point,
wherein an arc is defined by the origin points of the radii of curvature, and the origin point of each curved surface section posterior to the anterior-most curved surface section is posterior to the origin point of an anteriorly-adjacent curved surface section.

2. The orthopaedic knee prosthesis of claim 1 , wherein the at least five curved surface sections include an anterior-most curved surface section and a posterior-most curved surface section, and an angle greater than 90 degrees is defined between the radius of curvature of the anterior-most curved surface and the radius of curvature of the posterior-most curved surface section.

3. The orthopaedic knee prosthesis of claim 2 , wherein the radius of curvature of the anterior-most curved surface section has a length greater than the radius of curvature of any other curved surface section and the length of the radius of curvature of each curved surface section posterior to the anterior-most curved surface section is less than the length of the radius of curvature of an anteriorly-adjacent curved surface section such that the length of the radius of curvature of the posterior-most curved surface section is less than the radius of curvature of any other curved surface section.

4. The orthopaedic knee prosthesis of claim 1 , wherein the condyle surface is configured to contact the bearing surface of the tibial bearing at (i) a third contact point on the condyle surface at a third degree of flexion greater than the second degree of flexion, and (ii) a fourth contact point on the condyle surface at a fourth degree of flexion greater than the third degree of flexion, the condyle surface between the third contact point and the fourth contact point being defined by a curved surface section having a constant radius of curvature.

5. The orthopaedic knee prosthesis of claim 4 , wherein:
the at least five curved surface sections includes a posterior-most curved surface section, and
the constant radius of curvature is greater than the radius of curvature of the posterior-most curved surface section.

6. The orthopaedic knee prosthesis of claim 1 , wherein the condyle surface of the femoral component is a medial condyle surface, and the femoral component includes a lateral condyle surface that is asymmetrical with the medial condyle surface.

7. The orthopaedic knee prosthesis of claim 1 , wherein the condyle surface of the femoral component is a medial condyle surface, and the femoral component includes a lateral condyle surface that is symmetrical with the medial condyle surface.

8. An orthopaedic knee prosthesis comprising:
a femoral component having a condyle surface curved in the sagittal plane, and
a tibial bearing having a bearing surface configured to articulate with the condyle surface of the femoral component,
wherein the condyle surface (i) contacts the bearing surface at a first contact point on the condyle surface at a first degree of flexion less than about 30 degrees and (ii) contacts the bearing surface at a second contact point on the condyle surface at a second degree of flexion greater than about 45 degrees,
wherein the condyle surface in the sagittal plane has a first radius of curvature at the first contact point, and a second radius curvature at the second contact point,
wherein the condyle surface in the sagittal plane between the first contact point and the second contact point includes a plurality of curved surface sections, each curved surface section having a different radius of curvature that extends from an origin point, and the origin points of curved surface sections define a curved arc,
wherein the plurality of curved surface sections include an anterior-most curved surface section, and the radius of curvature of the anterior-most curved surface section has a length greater than the radius of curvature of any other curved surface section of the plurality of curved surface sections.

9. The orthopaedic knee prosthesis of claim 8 , wherein the origin point of each curved surface section posterior to the anterior-most curved surface section is posterior to the origin point of an anteriorly-adjacent curved surface section.

10. The orthopaedic knee prosthesis of claim 8 , wherein the first degree of flexion is in the range of about 0 degrees to about 10 degrees, and the second degree of flexion is in the range of about 60 degrees to about 70 degrees.

11. The orthopaedic knee prosthesis of claim 10 , wherein the first degree of flexion is about 5 degrees, the second degree of flexion is about 70 degrees.

12. The orthopaedic knee prosthesis of claim 8 , wherein the length of the radius of curvature of each curved surface section posterior to the anterior-most curved surface section is less than the length of the radius of curvature of an anteriorly-adjacent curved surface section.

13. The orthopaedic knee prosthesis of claim 8 , wherein the condyle surface is configured to contact the bearing surface of the tibial bearing at (i) a third contact point on the condyle surface at a third degree of flexion greater than the second degree of flexion, and (ii) a fourth contact point on the condyle surface at a fourth degree of flexion greater than the third degree of flexion, wherein the condyle surface between the third contact point and the fourth contact point is defined by a curved surface section having a constant radius of curvature.

14. The orthopaedic knee prosthesis of claim 13 , wherein:
the at least five curved surface sections includes a posterior-most curved surface section, and
the constant radius of curvature is greater than of the radius of curvature of the a posterior-most curved surface section.

15. The orthopaedic knee prosthesis of claim 8 , wherein the condyle surface of the femoral component is a medial condyle surface, and the femoral component includes a lateral condyle surface that is asymmetrical with the medial condyle surface.

16. The orthopaedic knee prosthesis of claim 8 , wherein the condyle surface of the femoral component is a medial condyle surface, and the femoral component includes a lateral condyle surface that is symmetrical with the medial condyle surface.

17. An orthopaedic knee prosthesis comprising:
a femoral component having a condyle surface curved in the sagittal plane; and
a tibial bearing having a bearing surface configured to articulate with the condyle surface of the femoral component,
wherein the condyle surface (i) contacts the bearing surface at a first contact point on the condyle surface at a first degree of flexion in the range of 0 degrees to about 30 degrees and (ii) contacts the bearing surface at a second contact point on the condyle surface at a second degree of flexion greater than 90 degrees, and
wherein (i) the condyle surface in the sagittal plane between the first contact point and the second contact point includes at least five curved sur

Assignees

• Depuy Ireland Ultd Co

Inventors

• Heldreth Mark A
• Auger Daniel D
• Wyss Joseph G
• Rumple Jr Danny W
• Wagner Christel M
• Sokolov Dimitri
• Lee Jordan S
• Williams John L
• Gomaa Said T
• Armacost John M

Classifications

• A61F2/3868

  with sliding tibial bearing · CPC title

• A61F2/38 Primary

  for elbows or knees · CPC title

• A61F2002/30245

  Partial spheres · CPC title

• A61F2/3836 Primary

  Special connection between upper and lower leg, e.g. constrained · CPC title

• A61F2/3859

  Femoral components · CPC title