TIBIAL INSERT AND ASSOCIATED SURGICAL METHOD

• US 20090270995A1
• Filed: 07/01/2009
• Published: 10/29/2009
• Est. Priority Date: 06/30/2005
• Status: Active Grant

• Current Assignee: DePuy Synthes Products LLC (Johnson & Johnson)
• Original Assignee: DePuy Synthes Products LLC (Johnson & Johnson)
• Inventors: Rhodes, James Matthew, Lee, Jordan Soonja
• Granted Patent: US 8,709,091 B2
• Time in Patent Office: Days
• US Class Current: 623/20.320
• 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 a bottom surface. A keel of the tibial insert is coupled to the bottom surface of the platform. A surgical method for knee anthroplasty is also disclosed.

Claims

1. An orthopaedic prothesis comprising:

unicompartmental tibial insert comprising;

a platform including an upper bearing surface and a bottom surface, the bottom surface having a recessed portion defined therein, and

a keel extending downwardly from the platform,

wherein the keel includes (i) a first downwardly-extending surface, (ii) a second downwardly-extending surface, and (iii) a rounded, distal surface defining an arc of about 180-degrees connecting the first and second downwardly-extending surfaces.

2. The orthopaedic prosthesis of claim 1, wherein:

the keel includes a first channel defined in one of the first and second downwardly-extending surfaces of the keel, and

the first channel extends along at least a portion of one of the first and second downwardly-extending surfaces of the keel.

3. The orthopaedic prosthesis of claim 2, wherein:

the keel further includes a second channel defined in one of the first and second downwardly-extending surfaces of the keel, and

the second channel extends along at least a portion of one of the first and second downwardly-extending surfaces of the keel.

4. The orthopaedic prosthesis of claim 3, wherein the keel further includes a plurality of auxiliary channels each in communication with at least one of the first and second channels.

5. The orthopaedic prosthesis of claim 4, wherein:

the keel includes an anterior end, and

the first channel and the second channel extend from the anterior end of the keel.

6. The orthopaedic prosthesis of claim 1, wherein the platform further includes:

a bottom wall positioned between the upper bearing surface and the bottom surface, the bottom wall being positioned parallel to the bottom surface and having a first opening defined therein,

an inner wall extending downwardly from the bottom wall, the inner wall and the bottom wall defining the recessed portion of the platform.

7. The orthopaedic prosthesis of claim 6, wherein the platform further includes:

an outboard surface extending from the upper bearing surface to the bottom surface, the outboard surface having a second opening defined therein, and

a passageway extending from the first opening of the bottom wall to the second opening of the outboard surface.

8. The orthopaedic prosthesis of claim 7, wherein:

the first opening is defined in a posterior portion of the bottom wall, and

the second opening is defined in an anterior portion of the outboard surface of the platform.

9. The orthopaedic prosthesis of claim 8, wherein the inner wall and the bottom wall define an acute angle therebetween.

10. A tibial insert comprising:

an upper bearing surface,

a bottom surface positioned below the upper bearing surface,

a bottom wall positioned between the upper bearing surface and the bottom surface, the bottom wall having a first opening defined therein,

an outboard surface extending from the upper bearing surface to the bottom surface, the outboard surface having a second opening defined therein,

an inner wall extending upwardly from the bottom surface to a bottom wall, and

a keel positioned below the bottom surface, the keel extending in an anterior-to-posterior direction,

wherein (i) the inner wall and the bottom wall cooperate to define a recessed portion, and (ii) a passageway extends from the first opening defined in the bottom wall to the second opening defined in the outboard surface.

11. The tibial insert of claim 10, wherein the recessed portion includes a first recessed area and a second recessed area, and

(i) the first recessed area being positioned laterally from the keel,

(ii) the second recessed area being positioned medially from the keel, and

(iii) the second recessed area being in fluid communication with the first recessed area.

12. The tibial insert of claim 11, wherein the first opening of the bottom wall is positioned in at least one of the first and second recessed areas.

13. The tibial insert of claim 10, wherein the keel includes a plurality of channels defined therein.

14. The tibial insert of claim 13, wherein:

the plurality of channels includes (i) a first plurality of channels extending along an anterior-to-posterior length of the keel and (ii) a second plurality of channels each in fluid communication with at least one of the first plurality of channels.

15. A surgical method for knee arthroplasty, the method comprising:

resecting at least a portion of a condyle of a patient'"'"'s tibia to create a surgically-prepared tibial surface,

positioning a tibial insert having an outer wall on the surgically-prepared tibial surface, and

injecting bone cement into a space between the surgically-prepared tibial surface and the tibial insert such that bone cement displaces air out of the space and into a passageway extending from the space through the outer wall of the tibial insert.

16. The surgical method of claim 15, wherein the positioning step includes (i) forming a slot in the surgically-prepared tibial surface such that the slot extends posteriorly from an opening formed in an anterior surface of the tibia, and (ii) inserting a keel of a tibial insert through the opening defined in the anterior surface of the tibia and into the slot defined in the surgically-prepared tibial surface.

17. The surgical method of claim 16, wherein the injecting step includes injecting bone cement into the slot formed in the surgically-prepared tibial surface.

18. The surgical method of claim 16, further comprising:

filling the opening formed in the anterior surface of the tibia with bone graft material after injecting bone cement into the space.

19. The surgical method of claim 16, wherein the injecting step further includes injecting bone cement into the slot formed in the surgically-prepared tibial surface such that bone cement enters a plurality of channels formed in the keel of the tibial insert.

20. The surgical method of claim 15, wherein the resecting step includes (i) drilling a hole in the condyle, (ii) inserting an elongated cylindrical pin into the hole drilled in the condyle, (iii) advancing a surgical saw medially from a lateral surface of the tibia to contact the pin, and (iv) advancing the surgical saw inferiorly from a superior surface of the condyle to contact the pin.