TIBIAL INSERT AND METHOD FOR IMPLANTING THE SAME

• US 20070299531A1
• Filed: 06/22/2006
• Published: 12/27/2007
• Est. Priority Date: 06/22/2006
• Status: Active Grant

• Current Assignee: Depuy Products Incorporated (Johnson & Johnson)
• Original Assignee: Depuy Products Incorporated (Johnson & Johnson)
• Inventors: Rhodes, James Matthew, Lee, Jordan Soonja
• Granted Patent: US 8,114,165 B2
• Time in Patent Office: Days
• US Class Current: 623/20.32
• CPC Class Codes: A61F 2/3094 Designing or manufacturing processes
• CPC Class Codes: A61F 2/389 Tibial components A61F2/3868 takes precedence
• CPC Class Codes: A61F 2002/3895 unicompartimental

Abstract

A tibial insert includes a platform defining an upper bearing surface and first and second keels extending downwardly from the platform. Each of the first and second keels includes an angled anterior face. A surgical method for knee arthroplasty is also disclosed.

Claims

1. A tibial insert comprising:

a platform including an upper bearing surface,

a first keel extending downwardly from the platform such that a longitudinal axis of the first keel is generally parallel with an inboard surface of the platform, and

a second keel extending downwardly from the platform such that a longitudinal axis of the second keel is generally parallel with the longitudinal axis of the first keel.

2. The tibial insert of claim 1, wherein an anterior face of the second keel is positioned posteriorly from an anterior face of the first keel.

3. The tibial insert of claim 2, wherein a posterior face of the second keel is positioned anteriorly from a posterior face of the first keel.

4. The tibial insert of claim 2, wherein the second keel is positioned laterally from the first keel.

5. The tibial insert of claim 2, wherein the anterior face of the first keel and the anterior face of the second keel are each angled.

6. The tibial insert of claim 5, wherein the angle of the anterior face of the first and second keels is approximately 145 degrees from a bottom surface of the platform.

7. The tibial insert of claim 5, wherein a posterior face of each of the first and second keels is generally vertical.

8. The tibial insert of claim 1, wherein a length of the first keel is greater than a length of the second keel.

9. A tibial insert comprising:

a platform including an upper bearing surface,

a first keel extending downwardly from the platform and including a first angled anterior face,

a second keel extending downwardly from the platform and including a second angled anterior face, wherein the second angled anterior face of the second keel is positioned posteriorly from an anterior face of the first keel.

10. The tibial insert of claim 9, wherein the second keel is generally positioned within a posterior portion of the tibial insert.

11. The tibial insert of claim 9, wherein the angle of the second angled anterior face of the second keel is approximately 145 degrees from a bottom surface of the platform.

12. The tibial insert of claim 11, wherein the angle of the first angled anterior face of the first keel is approximately 145 degrees from a bottom surface of the platform.

13. The tibial insert of claim 9, wherein a longitudinal axis of the first keel is parallel to a longitudinal axis of the second keel.

14. The tibial insert of claim 13, wherein the longitudinal axes of each of the first and second keels are parallel to an inboard surface of the platform.

15. A surgical method for knee arthroplasty comprising:

resecting at least a portion of a condyle to create a surgically-prepared, generally horizontal surface,

forming a first slot in the surgically-prepared, generally horizontal surface such that the first slot is positioned between and spaced-apart from an anterior surface of the tibia and a posterior surface of the tibia,

forming a second slot in the surgically-prepared, generally horizontal surface such that the second slot is positioned between and spaced-apart from the anterior surface of the tibia and the posterior surface of the tibia, and

inserting (i) a first keel of a tibial insert into the first slot formed in the surgically-prepared, generally horizontal surface and (ii) a second keel of the tibial insert into the second slot formed in the surgically-prepared, generally horizontal surface.

16. The surgical method of claim 15, wherein inserting the first keel includes (i) inserting a posterior end of the first keel into the first slot, (ii) sliding the first keel in a posterior direction such that the posterior end of the first keel engages the posterior end of the first slot, and (iii) pivoting the tibial insert downwardly such that a second end of the first keel is positioned within the first slot.

17. The surgical method of claim 16, wherein inserting the second keel includes (i) inserting a posterior end of the second keel into the second slot, (ii) sliding the second keel in a posterior direction such that the posterior end of the second keel engages the posterior end of the second slot, and (iii) pivoting the tibial insert downwardly such that a second end of the second keel is positioned within the second slot.

18. The surgical method of claim 15, wherein forming the second slot includes positioning the second slot in an orientation parallel to the first slot.

19. The surgical method of claim 18, wherein forming the second slot further includes forming an anterior end of the second slot posteriorly from an anterior end of the first slot.

20. The surgical method of claim 18, wherein forming the second slot further includes positioning the second slot laterally from the first slot.