PATIENT-SPECIFIC AUGMENTS

• US 20110190899A1
• Filed: 03/15/2011
• Published: 08/04/2011
• Est. Priority Date: 02/27/2006
• Status: Abandoned Application

• Current Assignee: Biomet Manufacturing, LLC (Zimmer Biomet Holdings, Inc.)
• Original Assignee: Biomet Manufacturing, LLC (Zimmer Biomet Holdings, Inc.)
• Inventors: Pierce, Andrew L., Metzger, Robert
• Application Number:
  US13/047,924
• Publication Number:
  US 20110190899A1
• Time in Patent Office: Days
• US Class Current: 623/20.32
• CPC Class Codes: A61F 2/30 Joints
• CPC Class Codes: A61F 2/30734 Modular inserts, sleeves or augments, e.g. placed on proximal part of stem for fixation purposes or wedges for bridging a bone defect
• CPC Class Codes: A61F 2/30767 Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
• CPC Class Codes: A61F 2/30942 for designing or making customized prostheses, e.g. using templates, CT or NMR scans, finite-element analysis or CAD-CAM techniques
• CPC Class Codes: A61F 2/38 for elbows or knees
• CPC Class Codes: A61F 2/3859 Femoral components
• CPC Class Codes: A61F 2/389 Tibial components A61F2/3868 takes precedence
• CPC Class Codes: A61F 2002/30011 differing in porosity
• CPC Class Codes: A61F 2002/30433 using additional screws, bolts, dowels, rivets or washers e.g. connecting screws
• CPC Class Codes: A61F 2002/30604 modular
• CPC Class Codes: A61F 2002/30736 Augments or augmentation pieces, e.g. wedges or blocks for bridging a bone defect
• CPC Class Codes: A61F 2002/30738 Sleeves
• CPC Class Codes: A61F 2002/30784 Plurality of holes
• CPC Class Codes: A61F 2002/30878 with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts
• CPC Class Codes: A61F 2002/30948 using computerized tomography, i.e. CT scans
• CPC Class Codes: A61F 2002/30952 using CAD-CAM techniques or NC-techniques

Abstract

A patient-specific augment can be attached to an implant component for a bone of a joint of a patient. The patient-specific augment has first and second surfaces. The first surface is a three-dimensional patient-specific surface that closely matches and can mate to a substantially unaltered and unresected surface of a bone defect of the specific patient only in one position. The second surface is designed to engage a non-custom surface of the implant.

Claims

1. An implantable device comprising:

a patient-specific augment attachable to an implant component for a bone of a joint of a patient, the augment having first and second surfaces, wherein the first surface is a three-dimensional patient-specific surface that closely matches and can mate to a substantially unaltered and unresected surface of a bone defect of the specific patient only in one position, and wherein the second surface is designed to engage a non-custom surface of the implant.

2. The implantable device of claim 1, wherein the augment includes a peripheral surface between the first and second surfaces, wherein the peripheral surface is a three-dimensional surface that closely matches and can mate to a complementary surface of the bone of the specific patient.

3. The implantable device of claim 2, wherein the augment has a patient-specific and variable depth between the first and second surfaces.

4. The implantable device of claim 3, wherein the depth of the augment has a patient-specific step discontinuity.

5. The implantable device of claim 1, wherein the second surface is planar.

6. The implantable device of claim 1, wherein the second surface is piece-wise planar.

7. The implantable device of claim 1, wherein the first surface has a porous coating and is a continuously curved surface.

8. The implantable device of claim 1, wherein the first surface includes convex and concave portions.

9. The implantable device of claim 3, wherein the first surface has a step discontinuity.

10. The implantable device of claim 1, wherein the augment is a femoral augment engageable to a femoral implant of a distal femur of a knee joint of the patient.

11. The implantable device of claim 1, wherein the augment is a tibial augment engageable to a tibial implant of a distal femur of a knee joint of the patient.

12. An implantable device comprising:

an implant component for a bone of a knee joint of a patient, the knee implant component having an outer surface facing the knee joint and a second non-custom surface opposite to the outer surface; and

an augment having first and second surfaces, wherein the first surface is non-custom surface mating with the non-custom surface of the knee implant and the second surface is a three-dimensional patient specific surface that closely matches and can mate to a substantially unaltered and unresected surface of a bone defect of the specific patient only in one position.

13. The implantable device of claim 12, wherein the augment has a patient-specific and variable depth measured between the first and second surfaces of the augment.

14. The implantable device of claim 13, wherein the augment includes a peripheral surface between the first and second surfaces, and the peripheral surface is a three-dimensional patient specific surface that closely matches and can mate to a complementary surface of the bone of the specific patient.

15. The implantable device of claim 14, wherein the peripheral surface has patient-specific variable radial dimension at each depth along the augment.

16. The implantable device of claim 13, wherein the first surface of the augment is planar.

17. The implantable device of claim 12, wherein the first surface of the augment is piece-wise planar.

18. The implantable device of claim 12, wherein the implant component is a distal femoral component and the augment is a femoral augment.

19. The implantable device of claim 18, wherein the femoral augment is a femoral sleeve with a fixation bore receiving a boss of the distal femoral component in a taper fit connection.

20. The implantable device of claim 12, wherein the implant is a tibial tray and the augment is a tibial augment.

21. The implantable device of claim 12, wherein the augment is a tibial sleeve for a proximal tibial bone.

22. A method of preparing a knee joint for an implant component:

preparing a bone end of a knee joint of the patient with standard resections configured to match a non-custom bone-engaging surface of an implant component without resecting a three-dimensional surface of a defect in the bone;

attaching a first implant-engaging surface of a patient-specific augment to a portion of the bone-engaging surface of the implant;

nestingly mating a second patient-specific three-dimensional surface of the augment to the three-dimensional surface of the defect; and

attaching the implant to the bone.

23. The method of claim 22, further comprising mating a third patient-specific peripheral surface of the augment to at least a portion of a complementary surface of the bone.

24. The method of claim 22, further comprising:

reconstructing a three-dimensional image of the bone with the defect from a medical scan of the bone during a preoperative plan for the patient;

selecting the implant component for the specific patient; and

manufacturing the patient-specific augment from the three-dimensional image of the bone of the specific patient and the implant component.