TIBIAL INSERT HAVING MULTIPLE KEELS

• US 20070299529A1
• Filed: 06/22/2006
• Published: 12/27/2007
• Est. Priority Date: 06/22/2006
• Status: Active Grant

• Current Assignee: DePuy Synthes Products LLC (Johnson & Johnson)
• Original Assignee: Depuy Products Incorporated (Johnson & Johnson)
• Inventors: Rhodes, James Matthew, Lee, Jordan Soonja
• Granted Patent: US 8,540,778 B2
• Time in Patent Office: Days
• US Class Current: 623/20.32
• CPC Class Codes: A61F 2/389 Tibial components A61F2/3868 takes precedence
• CPC Class Codes: A61F 2002/30884 Fins or wings, e.g. longitudinal wings for preventing rotation within the bone cavity
• CPC Class Codes: A61F 2002/30891 Plurality of protrusions
• CPC Class Codes: A61F 2002/30892 parallel
• CPC Class Codes: A61F 2002/30894 inclined obliquely with respect to each other
• CPC Class Codes: A61F 2002/3895 unicompartimental

Abstract

A tibial insert includes a platform defining an upper bearing surface and plurality of keels of the tibial insert extend downwardly from the platform. A surgical method for knee arthroplasty is also disclosed.

Claims

1. A tibial insert comprising:

a platform including an upper bearing surface, and

a plurality of keels extending downwardly from the platform.

2. The tibial insert of claim 1, wherein each of the plurality of keels includes a longitudinal axis and the plurality of keels are positioned such that none of the longitudinal axes of the plurality of keels are parallel to an axis running along an inboard surface of the platform.

3. The tibial insert of claim 2, wherein a first longitudinal axis of one of the plurality of keels is parallel to a second longitudinal axis of another of the plurality of keels.

4. The tibial insert of claim 2, wherein a first longitudinal axis of one of the plurality of keels intersects a second longitudinal axis of another of the plurality of keels.

5. The tibial insert of claim 4, wherein the first longitudinal axis is orthogonal to the second longitudinal axis.

6. The tibial insert of claim 1, wherein the plurality of keels defines a total keel volume, and wherein a medial portion of the total keel volume located on a medial side of the tibial insert is greater than a lateral portion of the total keel volume located on a lateral side of the tibial insert.

7. The tibial insert of claim 1, wherein the plurality of keels defines a total keel volume and wherein a first portion of the total keel volume located on the medial side of the tibial insert is different from a second portion of the total keel volume located on the lateral side of the tibial insert.

8. The tibial insert of claim 1, wherein the plurality of keels includes a first keel and a second keel.

9. The tibial insert of claim 8, wherein the plurality of keels further includes a third keel.

10. The tibial insert of claim 1, wherein a longitudinal axis of each of the plurality of keels is parallel to a bottom surface of the platform.

11. The tibial insert of claim 10, wherein a length of each of the plurality of keels is substantially the same.

12. The tibial insert of claim 1, wherein each of the plurality of keels includes a longitudinal axis and further wherein none of the longitudinal axes of the plurality of keels are coaligned with each other.

13. A surgical method for knee arthroplasty comprising:

determining the quality of the bone of various sections of a patient'"'"'s resected tibia,

selecting a tibial insert having a keel arrangement which corresponds to areas of poor quality of the patient'"'"'s resected tibia,

forming one or more slots in a surgically-prepared surface of the resected tibia which correspond to the keel arrangement of the selected tibial insert, and

inserting the keel arrangement of the tibial insert into the one or more slots.

14. The surgical method of claim 13, wherein selecting a tibial insert includes selecting a tibial insert from a plurality of tibial inserts having different keel arrangements.

15. The surgical method of claim 13, wherein forming one or more slots in the surgically-prepared surface includes forming one or more slots in the areas of poor bone quality of the patient'"'"'s resected tibia.

16. The surgical method of claim 13, wherein determining the quality of the bone of various sections of the patient'"'"'s resected tibia includes placing a template onto the surgically-prepared surface of the resected tibia and pressing a probe into portions of the surgically-prepared surface.

17. The surgical method of claim 16, further comprising marking the bone through cut-out portions of the template to indicate areas of poor bone quality.

18. The surgical method of claim 17, wherein forming one or more slots includes forming the one or more slots through cut-out portions of the template which have been marked to indicate areas of poor bone quality.

19. A tibial insert comprising:

a platform including an upper bearing surface, and

a keel extending downwardly from the platform, the keel having a longitudinal axis that is arranged in a non-parallel relationship relative to an inboard edge of the platform.