Tibial implant and systems with variable slope

Patent metadata

Field	Value
Publication number	US-9877790-B2
Application number	US-201113294617-A
Country	US
Kind code	B2
Filing date	Nov 11, 2011
Priority date	May 25, 2001
Publication date	Jan 30, 2018
Grant date	Jan 30, 2018

Abstract

Methods and devices are disclosed relating improved articular models, implant components, and related guide tools and procedures. In addition, methods and devices are disclosed relating articular models, implant components, and/or related guide tools and procedures that include one or more features derived from patient-data, for example, images of the patient's joint. The data can be used to create a model for analyzing a patient's joint and to devise and evaluate a course of corrective action. The data also can be used to create patient-adapted implant components and related tools and procedures.

First claim

We claim:

1. A knee replacement system for implantation in a knee joint of a patient, comprising:
a knee replacement implant including a femoral implant for implantation on a femur of the patient and a tibial implant for implantation on a tibia of the patient,
the femoral implant including a lateral condyle portion having a curved condylar shape in a sagittal plane and having a lateral weight bearing surface configured to articulate with the tibial implant when the tibial and femoral implants are implanted in the knee joint of the patient and an inner surface configured to abut one or more bone cut surfaces of a femur when the femoral implant is implanted in the knee joint of the patient, wherein the lateral condyle portion has a narrowed posterior portion, such that a width of the lateral condyle portion measured in substantially a mediolateral direction narrows in the lateral posterior portion relative to a distal part of the lateral condylar portion, and
the tibial implant including a lateral weight bearing surface configured to articulate with the lateral weight bearing surface of the femoral implant along an articulating region in a generally sagittal direction when the tibial and femoral implants are implanted in the knee joint of the patient, and a bone-facing surface configured to abut a surface of a tibia of the patient when the tibial implant is implanted in the knee joint of the patient,
wherein the tibial lateral weight bearing surface includes a variable slope having a at least one portion forming a negative slope relative to the bone facing surface in an anteroposterior direction and at least one portion forming a positive slope relative to the bone facing surface anteroposterior direction.

2. The knee implant system of claim 1 wherein the variable slope of the tibial lateral weight bearing surface forms a convex weight bearing surface portion substantially in an anteroposterior direction.

3. The knee implant system of claim 1 , wherein the variable slope of the tibial lateral weight bearing surface forms a convex weight bearing surface portion substantially in an anteroposterior direction and a concave weight bearing surface portion substantially in an anteroposterior direction.

4. The knee implant system of claim 1 , wherein the variable slope of the tibial lateral weight bearing surface forms a convex weight bearing surface portion substantially in an anteroposterior direction and a concave weight bearing surface portion substantially in an anteroposterior direction that is positioned posteriorly relative to the convex weight bearing surface portion.

5. The knee implant system of claim 1 , wherein the variable slope of the tibial lateral weight bearing surface forms a convex weight bearing surface portion substantially in an anteroposterior direction and a concave weight bearing surface portion substantially in an anteroposterior direction that is positioned anteriorly relative to the convex weight bearing surface portion.

6. The knee implant system of claim 1 , wherein the variable slope of the tibial lateral weight bearing surface forms a convex weight bearing surface portion substantially in an anteroposterior direction, a first concave weight bearing surface portion substantially in an anteroposterior direction that is positioned anteriorly relative to the convex weight bearing surface portion, and a second concave weight bearing surface portion substantially in an anteroposterior direction that is positioned posteriorly relative to the convex weight bearing surface portion.

7. The knee implant system of claim 1 , wherein the narrowed posterior portion is configured to avoid soft tissue impingement.

8. The knee implant system of claim 7 , wherein the tibial implant and femoral implant are configured to avoid impingement of the femoral implant on the popliteus tendon of the patient by the femoral implant when the tibial implant is implanted in the patient and the femoral implant is in a flexed position relative to the tibial implant.

9. The knee implant system of claim 1 , wherein the tibial lateral weight bearing surface is curved in a mediolateral direction.

10. The knee implant system of claim 1 , wherein the tibial lateral weight bearing surface is concave substantially in a coronal plane.

11. The knee implant system of claim 1 , wherein the tibial lateral weight bearing surface is convex substantially in a coronal plane.

12. A knee replacement system for implantation in a knee joint of a patient, comprising:
a knee replacement implant including a femoral implant for implantation on a femur of the patient and a tibial implant for implantation on a tibia of the patient,
the femoral implant including a lateral condyle portion having a generally curved lateral condylar shape, and having a lateral weight bearing surface configured to articulate with the tibial implant when the tibial and femoral implants are implanted in the knee joint of the patient and an inner surface configured to abut one or more bone cut surfaces of a lateral condyle of a femur when the femoral implant is implanted in the knee joint of the patient, wherein the lateral condyle portion includes a lateral distal portion and a lateral posterior portion; and
the femoral implant further including a medial condyle portion having a generally curved medial condylar shape and having a medial bearing surface configured to articulate with the tibial implant when the tibial and femoral implants are implanted in the knee joint of the patient and a second inner surface configured to abut one or more bone cut surfaces of a medial condyle of the femur when the femoral implant is implanted in the knee joint of the patient, wherein the medial condyle portion includes a medial distal portion and a medial posterior portion, wherein the medial distal portion of the medial condyle portion and the lateral distal portion of the lateral condyle portion each having substantially the same width measured in substantially the mediolateral direction and the medial posterior portion of the medial condyle portion being wider than the lateral posterior portion of the lateral condyle portion measured in substantially the mediolateral direction; and
further comprising a tibial implant including a lateral plateau portion with a lateral plateau bearing surface configured to articulate with the lateral weight bearing surface of the femoral implant when the tibial and femoral implants are implanted in the knee joint of the patient, a medial plateau portion with a medial plateau bearing surface configured to articulate with the medial bearing surface of the femoral implant when the tibial and femoral implants are implanted in the knee joint of the patient, and a bone-facing surface configured to abut a cut proximal end of a tibia of the patient when the tibial implant is implanted in the knee joint of the patient, wherein the lateral plateau bearing surface includes a variable slope having a at least one portion forming a negative slope relative to the bone facing surface and at least one portion forming a positive slope relative to the bone facing surface.

13. The knee replacement system of claim 12 , wherein the medial plateau bearing surface is configured to be offset in a distal direction relative to the lateral plateau bearing surface when the tibial implant is implanted in the patient.

14. The knee replacement system of claim 12 , wherein the lateral distal portion of the lateral condyle portion is wider than the lateral posterior portion of the lateral condyle portion measured in substantially the mediolateral direction.

15. The knee replacement system of claim 12 , whe

Assignees

• Bojarski Raymond A
• Chao Nam T
• Slamin John
• Lang Philipp
• Fitz Wolfgang
• Steines Daniel
• Conformis Inc

Inventors

• Bojarski Raymond A
• Chao Nam T
• Slamin John
• Lang Philipp
• Fitz Wolfgang
• Steines Daniel

Classifications

• A61B17/1764

  for the knee · CPC title

• A61F2002/30327

  differing in diameter · CPC title

• A61B34/10 Primary

  Computer-aided planning, simulation or modelling of surgical operations · CPC title

• A61F2002/30952

  using CAD-CAM techniques or NC-techniques · CPC title

• A61B2034/107

  Visualisation of planned trajectories or target regions · CPC title