Bone pads

Patent metadata

Field	Value
Publication number	US-9427334-B2
Application number	US-201414195113-A
Country	US
Kind code	B2
Filing date	Mar 3, 2014
Priority date	Mar 8, 2013
Publication date	Aug 30, 2016
Grant date	Aug 30, 2016

Abstract

Disclosed herein are systems and methods for bone preparation with designed areas having accurate tolerance profiles to enable improved initial fixation and stability for cementless implants and to improve long-term bone ingrowth/ongrowth to an implant. A method of preparing a bone surface to receive a prosthetic implant thereon having an articular surface and a bone contacting surface includes resecting the bone surface at a first location to create a first resected region having a first tolerance profile with a first cross-section, resecting the bone surface at a second location to create a second resected region having a second tolerance profile with a second cross-section less dense than the first cross-section, and contacting the bone contacting surface of the prosthetic implant with the first resected region.

First claim

The invention claimed is:

1. A method of preparing a bone surface to receive a prosthetic implant thereon, the prosthetic implant having an articular surface and a bone contacting surface, the method comprising:
resecting the bone surface at a first location to create a first resected region having a first tolerance profile with a first cross-section having peaks and valleys;
resecting the bone surface at a second location to create a second resected region having a second tolerance profile with a second cross-section less dense than the first cross-section such that the second cross-section has peaks further apart and valleys deeper than the peaks and valleys of the first cross-section; and
contacting the bone contacting surface of the prosthetic implant with the first resected region.

2. The method of claim 1 , further comprising:
forming at least one recess in the bone surface prior to implanting the prosthetic implant on the bone surface; and
inserting a retention element extending from the bone contacting surface in the at least one recess in the bone surface.

3. The method of claim 2 , including applying downward force to the articular surface of the prosthetic implant to compact bone in the first resected region.

4. The method of claim 1 , further comprising:
resecting the bone surface at a plurality of locations to create a plurality of resected regions each having a tolerance profile with a cross-section, wherein the tolerance profile of each of the plurality of resected regions is denser than the cross-section of the second tolerance profile.

5. The method of claim 4 , wherein the tolerance profile of the second resected region is ±0.010 inches and the tolerance profile of the plurality of resected regions is ±0.025 inches.

6. The method of claim 4 , wherein a first of the plurality of resected regions is located at an anterior aspect of the bone surface.

7. The method of claim 6 , wherein a second of the plurality of resected regions is located at an outer aspect of the bone surface.

8. The method of claim 7 , wherein a third of the plurality of resected regions is located at a posterior aspect of the bone surface.

9. The method of claim 8 , wherein the cross-section of the tolerance profile of the first of the plurality of resected regions is less dense than the cross-section of the tolerance profile of the second of the plurality of resected regions and is more dense than the cross-section of the tolerance profile of the third of the plurality of resected regions.

10. A method of preparing a bone surface to receive a prosthetic implant thereon, the prosthetic implant having an articular surface and a bone contacting surface, the method comprising:
resecting the bone surface at an anterior aspect thereof to create a first resected region having a first tolerance profile with a first cross-section having peaks and valleys;
resecting the bone surface at a posterior aspect thereof to create a second resected region having a second tolerance profile with a second cross-section having peaks further apart and valleys deeper than the peaks and valleys of the first cross-section such that the first cross-section is denser than the second cross-section; and
contacting the bone contacting surface of the prosthetic implant with the first resected region.

11. The method of claim 10 , further comprising:
forming at least one recess in the bone surface prior to implanting the prosthetic implant on the bone surface; and
inserting a retention element extending from the bone contacting surface in the at least one recess in the bone surface.

12. The method of claim 11 , including applying downward force to the articular surface of the prosthetic implant to compact bone in the first resected region.

13. The method of claim 10 , further comprising:
resecting the bone surface at a plurality of locations to create a plurality of resected regions each having a tolerance profile with a cross-section, wherein the tolerance profile of each of the plurality of resected regions is denser that the cross-section of the second tolerance profile.

14. The method of claim 13 , wherein the tolerance profile of the second resected region is ±0.010 inches and the tolerance profile of the plurality of resected regions is ±0.025 inches.

15. A method of preparing a bone surface to receive a prosthetic implant thereon, the prosthetic implant having an articular surface and a bone contacting surface, the method comprising:
resecting the bone surface at a peripheral region thereof to create a first resected region having a first tolerance profile with a first cross-section having peaks and valleys;
resecting the bone surface at an anterior region thereof to create a second resected region having a second tolerance profile with a second cross-section having peaks further apart and valleys deeper than the peaks and valleys of the first cross-section such that the first cross-section is denser than the second cross-section; and
contacting the bone contacting surface of the prosthetic implant with the first resected region.

16. The method of claim 15 , further comprising:
forming at least one recess in the bone surface prior to implanting the prosthetic implant on the bone surface; and
inserting a retention element extending from the bone contacting surface in the at least one recess in the bone surface.

17. The method of claim 16 , including applying downward force to the articular surface of the prosthetic implant to compact bone in the first resected region.

18. The method of claim 15 , further comprising:
resecting the bone surface at a plurality of locations to create a plurality of resected regions each having a tolerance profile with a cross-section, wherein the tolerance profile of each of the plurality of resected regions is denser than the cross-section of the second tolerance profile.

19. The method of claim 18 , wherein the tolerance profile of the second resected region is ±0.010 inches and the tolerance profile of the plurality of resected regions is ±0.025 inches.

Assignees

• Stryker Corp

Inventors

• Axelson Jr Stuart L
• Malackowski Donald W
• Stuart John Michael

Classifications

• A61B17/1604

  Chisels; Rongeurs; Punches; Stamps · CPC title

• A61F2/30771

  applied in original prostheses, e.g. holes or grooves · CPC title

• A61F2002/30807

  Plurality of blind bores · CPC title

• A61F2/46

  Special tools for implanting artificial joints · CPC title

• A61F2002/4631

  the prosthesis being specially adapted for being cemented · CPC title