# US 8,540,778 B2 · Tibial insert having multiple keels

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- Number: US 8,540,778 B2
- Document ID: US8540778B2
- Status: Granted
- Kind: B2
- Application number: 11/425,921
- Filed: 2006-06-22
- Published: 2007-12-27
- Granted: 2013-09-24
- Earliest claimed: 2006-06-22
- Assignees: DePuy Synthes Products, Inc.
- Applicants: James Matthew Rhodes; Jordan Soonja Lee
- Inventors: James Matthew Rhodes; Jordan Soonja Lee
- Web page: https://patentgrep.com/patent/US8540778B2

## CPC

- A61F 2/389: {Tibial components (A61F2/3868 takes precedence)}
- A61F 2002/30884: {Fins or wings, e.g. longitudinal wings for preventing rotation within the bone cavity}
- A61F 2002/30891: {Plurality of protrusions}
- A61F 2002/30892: {parallel}
- A61F 2002/30894: {inclined obliquely with respect to each other}
- A61F 2002/3895: {unicompartimental}
- A61F: FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS (dental prosthetics A61C)

## 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

### Claim 1

A tibial insert comprising:
a platform including an upper bearing surface, and
a plurality of keels extending downwardly from the platform, each of the plurality of keels having a longitudinal axis and being positioned such that a first longitudinal axis of a first keel of the plurality of keels intersects a second longitudinal axis of a second keel of the plurality of keels.

### Claim 2 (depends on 1)

The tibial insert of claim 1, wherein 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.

### Claim 3 (depends on 1)

The tibial insert of claim 1, wherein at least two keels of the plurality of keels having parallel longitudinal axes.

### Claim 4 (depends on 1)

The tibial insert of claim 1, wherein the first longitudinal axis is orthogonal to the second longitudinal axis.

### Claim 5 (depends on 1)

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.

### Claim 6 (depends on 1)

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.

### Claim 7 (depends on 1)

The tibial insert of claim 1, wherein the plurality of keels further includes a third keel.

### Claim 8 (depends on 1)

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

### Claim 9 (depends on 8)

The tibial insert of claim 8, wherein a length of each of the plurality of keels is substantially the same.

### Claim 10 (depends on 1)

The tibial insert of claim 1, wherein none of the longitudinal axes of the plurality of keels are coaligned with each other.

### Claim 11

A tibial insert comprising:
a platform including an upper bearing surface, and
a first, second, and third keel extending downwardly from the platform, each of the first, second, and third keels having a longitudinal axis that is arranged in a non-parallel relationship relative to an inboard edge of the platform,
wherein (i) the longitudinal axis of the first keel is non-parallel to both the longitudinal axis of the second keel and the longitudinal axis of the third keel, and (ii) the longitudinal axis of the second keel is non-parallel to the longitudinal axis of the third keel.