Method And Apparatus For Augumenting Bone Defects

• US 20130211536A1
• Filed: 03/15/2013
• Published: 08/15/2013
• Est. Priority Date: 02/18/2010
• Status: Active Grant

• Current Assignee: Biomet Manufacturing, LLC (Zimmer Biomet Holdings, Inc.)
• Original Assignee: Biomet Manufacturing, LLC (Zimmer Biomet Holdings, Inc.)
• Inventors: METZGER, Robert, MAY, Brian M., WILLIAMSON, Daniel E.
• Granted Patent: US 9,289,299 B2
• Time in Patent Office: Days
• US Class Current: 623/23.5
• CPC Class Codes: A61F 2/28 Bones joints A61F2/30
• 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 2/30965 Reinforcing the prosthesis by embedding particles or fibres during moulding or dipping
• CPC Class Codes: A61F 2/3607 including proximal or total replacement of the femur
• CPC Class Codes: A61F 2/3662 Femoral shafts
• CPC Class Codes: A61F 2/3672 Intermediate parts of shafts
• CPC Class Codes: A61F 2002/30062 (bio)absorbable, biodegradable, bioerodable, (bio)resorbable, resorptive
• CPC Class Codes: A61F 2002/3021 frustoconical
• CPC Class Codes: A61F 2002/30217 hollow cones, e.g. tubular-like cones
• CPC Class Codes: A61F 2002/30332 Conically- or frustoconically-shaped protrusion and recess
• CPC Class Codes: A61F 2002/30339 Double cones, i.e. connecting element having two conical connections, one at each of its opposite ends
• CPC Class Codes: A61F 2002/30406 Threads machined on spherical, e.g. hemispherical, surfaces
• CPC Class Codes: A61F 2002/30487 Circumferential cooperating grooves and beads on cooperating lateral surfaces of a mainly longitudinal connection
• CPC Class Codes: A61F 2002/30578 having apertures, e.g. for receiving fixation screws
• CPC Class Codes: A61F 2002/30738 Sleeves
• CPC Class Codes: A61F 2002/3092 having an open-celled or open-pored structure
• CPC Class Codes: A61F 2002/3096 trimmed or cut to a customised size
• CPC Class Codes: A61F 2310/00341 Coral, e.g. aragonite, porite
• CPC Class Codes: A61L 2430/02 for reconstruction of bones; weight-bearing implants
• CPC Class Codes: A61L 27/56 Porous materials, e.g. foams or sponges

Abstract

A bone augment for repairing a bone defect and associated method. The bone augment includes a porous body and a reinforcement member. The porous body defines a plurality of pores and is configured to be intraoperatively shaped to correspond to the bone defect. The reinforcement member is mounted on an exterior surface of the porous body and is configured to be intraoperatively shaped to correspond to the bone defect

Claims

1. A bone augment for repairing a bone defect comprising:

a bone-engaging body defining a plurality of pores, the body configured to be intraoperatively shaped to correspond to the bone defect; and

a polymeric reinforcement member mounted on an exterior surface of the bone-engaging body, the reinforcement member configured to be intraoperatively shaped to correspond to the bone defect.

2. The bone augment of claim 1, further comprising a projection extending from the polymeric reinforcement member, the projection including an aperture configured to receive a fastener to secure the bone augment to bone proximate to the bone defect.

3. The bone augment of claim 1, wherein the body includes at least one of a ceramic and Pro Osteon®

and the polymeric reinforcement member includes polyether ether ketone.

4. The bone augment of claim 1, wherein the bone augment is configured to repair an uncontained bone defect with the body replacing cancellous bone and the polymeric reinforcement member replacing cortical bone.

5. The bone augment of claim 1, wherein the polymeric reinforcement member is molded to the exterior surface such that portions of the reinforcement member are mechanically interlocked with the pores.

6. The bone augment of claim 1, wherein the body includes a density that approximates a density of cancellous bone and the polymeric reinforcement member includes a density that approximates a density of cortical bone.

7. The bone augment of claim 1, further comprising first and second projections extending from opposite sides the polymeric reinforcement member, each of the first and second projections including an aperture configured to receive a corresponding fastener to secure the bone augment to bone proximate to the bone defect.

8. The bone augment of claim 7, wherein each of the first and second projections is deformable to match the morphology proximate to the bone defect.

9. The bone augment of claim 7, wherein each of the first and second projections can be machined during manufacturing to match a specific patient'"'"'s morphology.

10. The bone augment of claim 7, wherein each of the first and second projections can be pressed into a mold of a corresponding implant site of a specific patient.

11. The bone augment of claim 1, wherein the reinforcement member is mounted on the body by injection or compression molding.

12. A bone augment for repairing a bone defect comprising:

a bone-engaging body defining a plurality of pores, the body configured to be intraoperatively shaped to correspond to the bone defect at an upper extremity of a tibia; and

a polymeric reinforcement member mounted on an exterior surface of the bone-engaging body and having first and second extensions corresponding to opposite sides of the defect, the reinforcement member configured to be intraoperatively shaped to correspond to the bone defect.

13. The bone augment of claim 12, wherein each of the first and second projections is deformable to match a patient'"'"'s morphology proximate to the bone defect.

14. The bone augment of claim 12, wherein each of the first and second projections can be machined during manufacturing to match a specific patient'"'"'s morphology.

15. The bone augment of claim 12, wherein each of the first and second projections including an aperture configured to receive a corresponding fastener to secure the bone augment to bone proximate to the bone defect.

16. The bone augment of claim 12, wherein the body includes at least one of a ceramic and Pro Osteon®

and the polymeric reinforcement member includes polyether ether ketone.

17. The bone augment of claim 12, wherein the body includes a density that approximates a density of cancellous bone and the polymeric reinforcement member includes a density that approximates a density of cortical bone.

18. A method for repairing a bone defect comprising:

inserting a porous body of a bone augment into a bone defect, the porous body shaped to correspond to the bone defect; and

fastening first and second extensions of a polymeric reinforcement member of the bone augment on opposite sides of the bone defect, the reinforcement member mounted on an exterior surface of the porous body.

19. The method of claim 18, further comprising bending the first and second extensions to match a patient morphology around the bone defect.

20. The method of claim 18, wherein the bone augment is configured for a bone defect at an upper extremity of a tibia.