Extended patellofemoral

Patent metadata

Field	Value
Publication number	US-9655727-B2
Application number	US-201314104693-A
Country	US
Kind code	B2
Filing date	Dec 12, 2013
Priority date	Dec 12, 2013
Publication date	May 23, 2017
Grant date	May 23, 2017

Abstract

Disclosed herein are knee replacement systems for replacing the articular surface of a distal femur. The systems include one or more unicompartmental components, namely patellofemoral, lateral condylar and medial condylar components. The components are configured such that when engaged to the femur the peripheries thereof do not cross specific locations and/or regions of the femur, namely the intercondylar notch and condylopatellar notch. The patellofemoral components described herein preferably have an extension portion extending posteriorly from a posterior periphery thereof towards an intercondylar notch or the femur without contacting the intercondylar notch of the femur when the patellofemoral component is engaged to the femur. The extension portion preferably extends posteriorly from a posterior periphery of the patellofemoral component towards the condylopatellar notch of the femur without contacting the notch.

First claim

The invention claimed is:

1. A patellofemoral component for replacing at least a portion of a femur having a sagittal plane and a lateral condylopatellar notch line transverse to the sagittal plane comprising:
a lateral portion configured to cover at least a lateral portion of the femur;
an intermediate portion adjacent to the lateral portion and configured to cover at least a portion of a length of a trochlear groove of the femur, the intermediate portion having a recess about a periphery thereof;
a medial portion adjacent to the intermediate portion and configured to cover at least a medial portion of the femur, the medial portion lying adjacent both an intercondylar notch and a medial condylopatellar notch line of the femur without contacting either of the intercondylar notch or the medial condylopatellar notch line when the patellofemoral component is engaged to the femur; and
an extension portion extending posteriorly from the recess of the intermediate portion and along the lateral portion towards the intercondylar notch and the lateral condylopatellar notch line of the femur, the recess being located on the sagittal plane and a plane defined by the extension portion intersecting the sagittal plane at a point posterior to the intercondylar notch,
wherein the extension portion extending posteriorly from the intermediate portion is substantially planar and lies adjacent both the intercondylar notch and lateral condylopatellar notch line and extends substantially parallel to the lateral condylopatellar notch line without contacting either of the intercondylar notch or lateral condylopatellar notch line of the femur when the patellofemoral component is engaged to the femur.

2. The patellofemoral component of claim 1 , wherein a portion of the extension portion extends away from at least a portion of the lateral condylopatellar notch line of the femur without contacting the condylopatellar notch line.

3. The patellofemoral component of claim 1 , wherein the medial portion covers at least a portion of an anterior portion of a medial condyle of the femur without contacting the medial condylopatellar notch line.

4. The patellofemoral component of claim 1 , wherein the extension portion covers at least a portion of a posterior portion of a lateral condyle of the femur without contacting the lateral condylopatellar notch line.

5. The patellofemoral component of claim 1 , wherein the lateral portion has a first posterior periphery, the intermediate portion has a second posterior periphery, the medial portion has a third posterior periphery, and the extension portion is at least partially located at a junction between the first and second posterior peripheries.

6. The patellofemoral component of claim 5 , wherein the extension portion protrudes posteriorly from the junction as a nub portion.

7. The patellofemoral component of claim 5 , wherein the extension portion protrudes posteriorly along a substantial portion of the first posterior periphery.

8. The patellofemoral component of claim 1 , wherein the extension portion lies about a line approximately 23° from a flexion axis of the femur, the flexion axis lying perpendicular to the sagittal plane.

9. The patellofemoral component of claim 1 , wherein the extension portion lies about a line approximately 47° from a flexion axis of the femur, the flexion axis lying perpendicular to the sagittal plane.

10. A knee replacement system for replacing at least a portion of a femur having a sagittal plane and medial and lateral condylopatellar notch lines transverse to the sagittal plane comprising:
a patellofemoral component including an extension portion extending posteriorly from a recess about a periphery of an intermediate portion and along a medial portion thereof towards an intercondylar notch and the medial condylopatellar notch line of the femur, the extension portion extending posteriorly from the recess of the intermediate portion being substantially planar and lying adjacent both the intercondylar notch and medial condylopatellar notch line and extending substantially parallel to the medial condylopatellar notch line without contacting either of the intercondylar notch or the medial condylopatellar notch line of the femur when the patellofemoral component is engaged to the femur, the patellofemoral component further including a lateral portion adjacent to the intermediate portion and configured to cover at least a lateral portion of the femur, the lateral portion lying adjacent both the intercondylar notch and the lateral condylopatellar notch line without contacting either of the intercondylar notch or the lateral condylopatellar notch line of the femur when the patellofemoral component is engaged to the femur; and
a condylar implant including a recessed portion opposed to the extension portion of the patellofemoral component when the condylar portion is engaged to a condyle of the femur, the recessed portion located adjacent the intercondylar notch of the femur without contacting the intercondylar notch.

11. The knee replacement system of claim 10 , wherein the intermediate portion connected to the lateral portion is configured to cover at least a portion of a length of a trochlear groove of the femur.

12. The knee replacement system of claim 11 , wherein the medial portion connected to the intermediate portion is configured to cover at least a medial portion of the femur.

13. The knee replacement system of claim 11 , wherein the lateral portion has a first posterior periphery, the intermediate portion has a second posterior periphery, the medial portion has a third posterior periphery, and the extension portion is located at a junction between the first and second posterior peripheries.

14. The knee replacement system of claim 13 , wherein the extension portion protrudes posteriorly from the junction as a nub portion.

15. The knee replacement system of claim 13 , wherein the extension portion protrudes posteriorly from the junction along a substantial portion of the first posterior periphery.

16. A knee replacement system for replacing at least a portion of a femur having a sagittal plane and medial and lateral condylopatellar notch lines transverse to the sagittal plane comprising:
a patellofemoral component including an extension portion extending posteriorly from a recess about a periphery of an intermediate portion and along a lateral portion and configured to overlie a portion of a lateral condyle of the femur above an intercondylar notch and the lateral condylopatellar notch line of the femur, the extension portion extending posteriorly from the recess of the intermediate portion being substantially planar and lying adjacent both the intercondylar notch and lateral condylopatellar notch line and extending substantially parallel to the lateral condylopatellar notch line without contacting either of the intercondylar notch or the lateral condylopatellar notch line of the femur when the patellofemoral implant is engaged to the femur, the patellofemoral component further including a medial portion adjacent to the intermediate portion and configured to cover at least a medial portion of the femur, the medial portion lying adjacent both the intercondylar notch and the medial condylopatellar notch line without contacting either of the intercondylar notch or the medial condylopatellar notch line of the femur when the patellofemoral component is engaged to the femur; and
a condylar implant including a recessed portion opposed to the extension portion of the patellofemoral component when the condylar portion is engaged to a condyle of the femur, the recessed porti

Assignees

• Stryker Corp

Inventors

• Wellings Peter John
• Ferko Michael C
• Axelson Jr Stuart L

Classifications

• A61F2/3877

  Patellae or trochleae · CPC title

• A61F2/3859 Primary

  Femoral components · CPC title