Glenoid resurfacing system and method

• US 9,662,126 B2
• Filed: 04/19/2010
• Issued: 05/30/2017
• Est. Priority Date: 04/17/2009
• Status: Active Grant

• Current Assignee: Arthrosurface, Inc (Anika Therapeutics Incorporated)
• Original Assignee: Arthrosurface, Inc (Anika Therapeutics Incorporated)
• Inventors: Sikora, George, Ek, Steven W.
• Primary Examiner(s): Beccia, Christopher
• Application Number:
  US12/762,948
• Publication Number:
  US 20100268239A1
• Time in Patent Office: 2,598 Days
• Field of Search: 606 79, 606 80, 606 87, 606 91, 606 81, 606 82, 623 1911- 1913, 623 2212, 623908
• CPC Class Codes: A61B 17/1684 for the shoulder
• CPC Class Codes: A61F 2/4081 Glenoid components, e.g. cups
• CPC Class Codes: A61F 2002/30233 Stepped cylinders, i.e. having discrete diameter changes
• CPC Class Codes: A61F 2002/30818 castellated or crenellated
• CPC Class Codes: A61F 2002/30879 Ribs
• CPC Class Codes: A61F 2002/30881 Circumferential ribs, flanges or fins
• CPC Class Codes: A61F 2002/30884 Fins or wings, e.g. longitudinal wings for preventing rotation within the bone cavity
• CPC Class Codes: A61F 2230/0069 cylindrical

Abstract

The present disclosure relates to a system and method for repairing an articular surface. A guide pin may be secured to an articular surface of a glenoid, wherein the guide pin defines a working axis and the working axis is positioned at an angle α relative to the articular surface, wherein angle α is less than or equal to 90 degrees. An excision device may be advanced over the guide pin, wherein the excision device includes a cannulated shaft and at least one cutter, wherein the at least one cutter is generally aligned in a single plane. A generally hemi-spherical excision site may be formed with the excision device within the articular surface of the glenoid.

Claims

1. A system for repairing a defect on a portion of an articular surface of a patient'"'"'s glenoid, said system comprising:

an excision device including;

a cannulated shaft having a first and a second open end defining a longitudinally disposed passageway configured to be advanced over a guide pin, and

a reamer including a first and a second cutter configured to extend radially outward about said cannulated shaft at an angle approximately 180 degrees from each other, said at least one cutter including a cutting surface having a generally arcuate shape sweeping towards a proximal end of said cannulated shaft configured to form a generally hemispherical excision site in said glenoid while said excision device is rotated about, and advanced over, said guide pin; and

wherein said reamer and said cannulated shaft are configured to be advanced in a space between the articular surfaces of said patient'"'"'s humerus and scapula such that a rotational axis of said excision device is non-perpendicular to said glenoid articular surface.

4. The system of claim 1, wherein a depth D of at least one of said cutters defines a height of said excision site created by said excision device.

5. The system of claim 1, wherein at least one of said cutters has a cross-sectional thickness of 0.5 mm to 3.0 mm.

6. The system of claim 1, wherein first and said second cutters each have a cross-sectional thickness of 0.5 mm to 3.0 mm.

7. The system of claim 1, wherein said reamer is integrally formed with said cannulated shaft.

8. The system of claim 1, wherein said reamer said cannulated shaft are a unitary structure.

9. The system of claim 1, wherein said cutting surface of at least one of said cutters includes a generally constant curvature.

10. The system of claim 1, wherein said cutting surface of at least one of said cutters includes at least one protrusion.

11. The system of claim 1, wherein said cutting surface of at least one of said cutters includes at least one recess.

12. The system of claim 1, further comprising said guide pin configured to be secured into bone beneath the articular surface of the glenoid.

13. The system of claim 1, further comprising a first implant including a load bearing surface and a bone facing surface, wherein said load bearing surface exhibits a contour substantially corresponding to the contour of the articular surface and said bone facing surface is configured to be received in said generally hemispherical excision site.

14. The system of claim 13, wherein said bone facing surface includes a generally hemi-spherical bone facing surface is configured to be received in said generally hemispherical excision site.

15. The system of claim 1, wherein at least one of said cutters has an overall radius Re in the range of 7.0 mm to 20.0 mm.

16. The system of claim 1, wherein swat least one of said cutters configured is configured to extend radially outward about only a circumferential portion of a distal end of said cannulated shaft.

17. The system of claim 1, wherein said reamer and said cannulated shaft are configured to be advanced in said space between the articular surfaces of said patient'"'"'s humerus and scapula such that said rotational axis of said excision device is non-perpendicular to said glenoid and a radius of said reamer is configured to project a center point of the radius of the reamer and a center point of the generally hemispherical excision site slightly above said glenoid.

18. The system of claim 17, wherein said radius of said reamer is configured to form said generally hemispherical excision site in only a portion of said glenoid about said guide pin and is substantially equal to a diameter of an implant configured to be received in said generally hemispherical excision site.

19. The system of claim 13, further comprising a second implant system configured to repair a defect on said articular surface of another bone, said second implant system comprising:

a post configured to engage said scapular proximate to said articular surface of said another bone, said post further comprising a tapered portion; and

an implant comprising a load bearing surface, a bone facing surface, and a tapered portion;

wherein said tapered portions are configured to couple said post to said implant.

20. The system of claim 12, wherein said guide pin is configured to be disposed at an angle α

relative to said articular surface, wherein angle α

is <

90 degrees.

21. The system of claim 12, wherein said guide pin is configured to be disposed at an angle α

relative to said articular surface, wherein 90 degrees≧

α

≧

45 degrees.

22. The system of claim 13, wherein an overall radius R_e of at least one of said cutters defines a radius of said excision site created by said excision device.

23. The system of claim 22, wherein said overall radius R_e substantially corresponds to a radius R_i of said implant.

24. The system of claim 13, wherein a depth D of said reamer substantially corresponds to a height H of said implant.

25. The system of claim 13, wherein said load bearing surface comprises a beveled region disposed about a perimeter of said load bearing surface.

26. The system of claim 13, wherein said bone facing surface comprises at least one lip, protrusion and/or rib configured to increase a mechanical connection between said implant and bone within said excision site.

27. The system of claim 13, wherein said implant comprises at least one keel extending generally outwardly from said bone facing surface.

28. The system of claim 27, wherein said at least one keel includes a protrusion disposed about a distal end of a base region.

2. An articular resurfacing system comprising:

a first implant system configured to repair a first defect on first articular surface of a first bone, said first implant system comprising;

a first post configured to engage said first bone proximate to said first articular surface, said first post further comprising a first tapered portion;

an implant comprising a first load bearing surface, a first bone facing surface, and a second tapered portion, wherein said first and said second tapered portions are configured to couple said first post to said implant; and

a second implant system configured to repair a second defect a second articular surface of a second bone, said second implant system comprising;

a second load bearing surface and a second bone facing surface, said second load bearing surface exhibits a contour substantially corresponding to the contour of the second articular surface and said second bone facing surface is configured to be received in a generally hemispherical excision site formed in said second bone, wherein said second bone is a glenoid.

3. The articular resurfacing system of claim 2, further comprising an excision device including:

a cannulated shaft defining a longitudinally disposed passageway configured to be advanced over a guide pin, and

a reamer including at least one cutter configured to extend radially outward about said cannulated shaft, said at least one cutter including a cutting surface having a generally arcuate shape sweeping towards a proximal end of said cannulated shaft configured to form a generally hemispherical excision site in said glenoid while said excision device is rotated about, and advanced over, said guide pin; and

wherein said reamer and said cannulated shaft are configured to be advanced in a space between the articular surfaces of said humerus and scapula such that a rotational axis of said excision device is non-perpendicular to said glenoid articular surface.

29. The articular resurfacing system of claim 2, wherein said first post includes a first cannulated post.

30. The articular resurfacing system of claim 29, further comprising a first guide pin, wherein said first cannulated post is configured to be advanced over said first guide pin.

31. The articular resurfacing system of claim 2, wherein second implant system further includes a second post configured to be coupled to said second bone facing surface and configured to engage bone beneath said second articular surface of said second bone.

32. The articular resurfacing system of claim 31, wherein said second post and said second bone facing surface each include tapered portions configured to couple said second post to said second bone facing surface.

33. The articular resurfacing system of claim 31, wherein said second post includes a second cannulated post.

34. The articular resurfacing system of claim 2, wherein said second bone facing surface includes a plurality of regions revolved about a plurality of axis.

35. A joint resurfacing system for repairing portions of a first and a second cooperating articular surface of a first and a second bone, respectively, wherein said joint resurfacing system comprises:

a first implant system configured to repair a first defect in said first articular surface of said first bone, said first implant system comprising;

a post configured to engage said first bone proximate to said first articular surface, said post further comprising a first tapered portion;

an implant comprising a first load bearing surface, a first bone facing surface, and a second tapered portion, wherein said first and said second tapered portions are configured to couple said post to said implant; and

a second implant system configured be received in a generally hemispherical excision site formed in a portion of said second articular surface of said second bone proximate to a second defect, said second implant system comprising;

a second load bearing surface and a second bone facing surface, said second load bearing surface exhibits a contour substantially corresponding to the contour of said portion of said second articular surface and said second bone facing surface is configured to be received in a generally hemispherical excision site formed in said second bone;

wherein said joint is the shoulder and wherein said second bone is the glenoid.

36. A joint resurfacing system for repairing portions of a first and a second cooperating articular surface of a first and a second bone, respectively, wherein said joint resurfacing system comprises:

a first implant system configured to be received in a generally circular excision site formed in said first articular surface of said first bone, said first implant system comprising;

a post configured to engage said first bone proximate to said first articular surface, said post further comprising a first tapered portion;

an implant comprising a first load bearing surface having generally circular cross-section substantially corresponding to said generally circular excision site, a first bone facing surface, and a second tapered portion, wherein said first and said second tapered portions are configured to couple said post to said implant; and

a second implant system configured be received in a generally hemispherical excision site formed in said second articular surface of said second bone, said second implant system comprising;

a second load bearing surface and a second bone facing surface, said second load bearing surface exhibits a contour substantially corresponding to the contour of the second articular surface and said second bone facing surface including a generally hemispherical profile having a radius substantially corresponding to a radius of a reamer configured to form said generally hemispherical excision site in said second bone;

wherein said joint is the shoulder and wherein said second bone is the glenoid.

37. A joint resurfacing system for repairing portions of a first and a second cooperating articular surface of a first and a second bone, respectively, wherein said joint resurfacing system comprises:

a first implant system configured to repair a portion of said first articular surface of said first bone, said first implant system comprising;

a post configured to engage said first bone proximate to said first articular surface, said post further comprising a first tapered portion;

an implant comprising a first load bearing surface, a first bone facing surface, and a second tapered portion, wherein said first and said second tapered portions are configured to couple said post to said implant; and

a second implant system configured be received in a generally hemispherical excision site formed in a portion of said second articular surface of said second bone, said second implant system comprising;

a second load bearing surface and a second bone facing surface, said second load bearing surface exhibits a contour substantially corresponding to the contour of the second articular surface and said second bone facing surface including a generally hemispherical profile having a radius substantially corresponding to a radius of a reamer configured to form said generally hemispherical excision site in said second bone such that a center point of said generally hemispherical profile is substantially the same as a center point of said reamer;

wherein said joint is the shoulder and wherein said second bone is the glenoid.

38. A joint resurfacing system for repairing portions of a first and a second cooperating articular surface of a first and a second bone, respectively, wherein said joint resurfacing system comprises:

a first implant system configured to repair a portion of said first articular surface of said first bone, said first implant system comprising;

a post configured to engage said first bone proximate to said first articular surface, said post further comprising a first tapered portion;

an implant comprising a first load bearing surface, a first bone facing surface, and a second tapered portion, wherein said first and said second tapered portions are configured to couple said post to said implant; and

a second implant system configured be received in a generally hemispherical excision site formed in a portion of said second articular surface of said second bone, said second implant system comprising;

a second load bearing surface and a second bone facing surface, said second load bearing surface exhibits a contour substantially corresponding to the contour of the second articular surface and said second bone facing surface including a generally hemispherical profile having a radius substantially corresponding to a radius of a reamer configured to form said generally hemispherical excision site in said second bone such that a rotational axis of said reamer is non-perpendicular to said second articular surface;

wherein said joint is the shoulder and wherein said second bone is the glenoid.

39. A joint resurfacing system for repairing portions of a first and a second cooperating articular surface of a first and a second bone, respectively, wherein said joint resurfacing system comprises:

a first implant system configured to repair a portion of said first articular surface of said first bone, said first implant system comprising;

a post configured to engage said first bone proximate to said first articular surface, said post further comprising a first tapered portion;

an implant comprising a first load bearing surface, a first bone facing surface, and a second tapered portion, wherein said first and said second tapered portions are configured to couple said post to said implant; and

a second implant system configured be received in a generally hemispherical excision site formed in a portion of said second articular surface of said second bone, said second implant system comprising;

a second load bearing surface having a contour substantially corresponding to the contour of the second articular surface;

a second bone facing surface having a generally hemispherical profile substantially corresponding to a generally hemispherical excision site formed in said second bone; and

at least one keel extending outwardly from said second bone facing surface;

wherein said joint is the shoulder and wherein said second bone is the glenoid.

40. A joint resurfacing system for repairing portions of a first and a second cooperating articular surface of a first and a second bone, respectively, wherein said joint resurfacing system comprises:

a first implant system configured to repair a portion of said first articular surface of said first bone, said first implant system comprising;

a post configured to engage said first bone proximate to said first articular surface, said post further comprising a first tapered portion;

an implant comprising a first load bearing surface, a first bone facing surface, and a second tapered portion, wherein said first and said second tapered portions are configured to couple said post to said implant; and

a second implant system configured be received in a generally hemispherical excision site formed in a portion of said second articular surface of said second bone, said second implant system comprising;

a second load bearing surface having a contour substantially corresponding to the contour of the second articular surface;

a second bone facing surface having a generally hemispherical profile substantially corresponding to a generally hemispherical excision site formed in said second bone; and

a beveled region disposed at least one at least a portion of a perimeter of said second load bearing surface;

wherein said joint is the shoulder and wherein said second bone is the glenoid.

41. A joint resurfacing system for repairing portions of a first and a second cooperating articular surface of a first and a second bone, respectively, wherein said joint resurfacing system comprises:

a first excision device configured to form a generally circular excision site in said first articular surface of said first bone;

a first implant system configured to be received in said generally circular excision site, said first implant system comprising;

a post configured to engage said first bone proximate to said first articular surface, said post further comprising a first tapered portion;

an implant comprising a first load bearing surface having a radius substantially corresponding to a radius of said first excision device, a first bone facing surface, and a second tapered portion configured to engage with said first second tapered portion to couple said post to said implant;

a second excision device configured to form a generally hemispherical excision site in said second bone;

said second excision device comprising;

a cannulated shaft configured to be advanced over a guide pin, and

a reamer including at least one cutter configured to extend radially outward about said cannulated shaft, said at least one cutter including a cutting surface having a generally arcuate shape sweeping towards a proximal end of said cannulated shaft configured to form said generally hemispherical excision site about said guide pin; and

a second implant system configured to be received in said generally hemispherical excision site, said second implant system comprising;

a second load bearing surface and a second bone facing surface, said second load bearing surface exhibits a contour substantially corresponding to the contour of the second articular surface and said second bone facing surface including a generally hemispherical profile having a radius substantially corresponding to a radius of said reamer;

wherein said second bone is a glenoid and wherein said reamer and said cannulated shaft are configured to be advanced in a space between the articular surfaces of a patient'"'"'s shoulder such that a rotational axis of said excision device is non-perpendicular to said glenoid articular surface.