INSTRUMENT FOR USE IN A JOINT REPLACEMENT PROCEDURE

• US 20090105837A1
• Filed: 06/02/2006
• Published: 04/23/2009
• Est. Priority Date: 06/03/2005
• Status: Active Grant

• Current Assignee: Depuy Ireland Unlimited Company (Johnson & Johnson)
• Original Assignee: Depuy (Johnson & Johnson)
• Inventors: Lafosse, Laurent, Hee, Julien
• Granted Patent: US 8,231,682 B2
• Time in Patent Office: Days
• US Class Current: 623/18.110
• CPC Class Codes: A61F 2/40 for shoulders
• CPC Class Codes: A61F 2/4014 Humeral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic humeral shafts
• CPC Class Codes: A61F 2/4059 Humeral shafts
• CPC Class Codes: A61F 2/4684 Trial or dummy prostheses
• CPC Class Codes: A61F 2002/30331 made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit
• CPC Class Codes: A61F 2002/30553 for adjusting a position by translation along an axis
• CPC Class Codes: A61F 2002/30616 Sets comprising a plurality of prosthetic parts of different sizes or orientations
• CPC Class Codes: A61F 2002/30617 Visible markings for adjusting, locating or measuring
• CPC Class Codes: A61F 2002/30772 Apertures or holes, e.g. of circular cross section
• CPC Class Codes: A61F 2002/30884 Fins or wings, e.g. longitudinal wings for preventing rotation within the bone cavity
• CPC Class Codes: A61F 2220/0033 made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit
• CPC Class Codes: A61F 2250/0008 for adjusting a position by translation along an axis or two perpendicular axes
• CPC Class Codes: A61F 2250/0097 Visible markings, e.g. indicia

Abstract

A trial implant component for use in a surgical procedure for replacement of a joint between a long bone and another bone, comprises a metaphyseal part which can be located so that it extends into a cavity at the resected face of the long bone in contact with the internal wall of the cavity in the metaphyseal region, and a disk which has an essentially flat shape and which can be fitted to the metaphyseal part to provide a gauge as to the appropriate size of a head part which is to be selected according to the location of the axis of the bone relative to the edge of the resected bone.

Claims

1. A trial implant component for use in a surgical procedure for replacement of a joint between a long bone and another bone, the long bone having a cavity formed therein, the cavity having an internal wall, comprising:

a metaphyseal part configured to be at least partially disposed within the cavity whereat a portion of the metaphyseal part is in contact with the internal wall; and

a disk having a substantially flat shape and configured to be fitted to the metaphyseal part to provide a gauge as to the appropriate size of a head part which is to be selected according to the location of the axis of the bone relative to the edge of the resected bone.

2. The trial implant component of claim 1, wherein the disk and the metaphyseal part are configured to be assembled together.

3. The trial implant component of claim 1, wherein one of the disk and the metaphyseal part carries a spigot and the other has a socket configured to receive the spigot.

4. The trial implant component of claim 3, wherein the spigot or socket provided on the disk is located eccentrically relative to the center of the disk.

5. The trial implant component of claim 1, wherein the disk has openings through which resected bone can be viewed when the disk is located on the bone.

6. The trial implant component of claim 5, wherein the disk comprises an outer rim, with a plurality of spokes extending inwardly from the rim.

7. The trial implant component of claim 1, wherein the disk is substantially circular.

8. A method of implanting a joint prosthesis in a joint between a long bone and another bone, the long bone having a cavity formed therein, the cavity having an internal wall, comprising the steps of:

providing a trial implant comprising a metaphyseal part configured to be at least partially disposed within the cavity whereat a portion of the metaphyseal part is in contact with the internal wall; and

a disk having a substantially flat shape and configured to be fitted to the metaphyseal part to provide a gauge as to the appropriate size of a head part which is to be selected according to the location of the axis of the bone relative to the edge of the resected bone;

implanting the metaphyseal part of the trial implant within the cavity in the long bone; and

fitting the disk to the metaphyseal part so as to assess the proximity of the edge of a component of a final implant prosthesis to the edge of the resected bone.

9. A method of shoulder joint replacement, comprising the steps of:

making an incision in the deltoid muscle along the direction of the deltoid fibers;

splitting the deltoid muscle along its fibers;

removing the glenohumeral ligaments and the coracoacromial ligament;

releasing the biceps tendon;

resecting the humeral head;

using a broach tool to provide a cavity within the humerus; and

implanting a prosthesis component in the cavity within the humerus.