Device and method for retroversion correction for shoulder arthroplasty

1. A kit for implanting a glenoid component comprising:

a retroversion glenoid component including a generally flat and circular glenoid bone contacting surface defining a first plane, a first offset peg extending away from the glenoid bone contacting surface, a concave articulating surface, an upper surface extending about the concave articulating surface and generally opposite to the glenoid bone contacting surface, the upper surface having an upper edge defining a second plane, the second plane not parallel to the first plane; and

a drill guide configured to guide a drill in forming a bore in a scapula to receive the first offset peg.

2. The kit of claim 1 , wherein the drill guide comprises:

a generally flat drill guide bone contacting surface defining a third plane;

a drill guide peg extending away from a bottom portion of the drill guide and defining a drill guide peg axis, the drill guide peg axis forming an angle other than 90 degrees with the third plane when viewed from a side plan view; and

a first drill guide hole extending upwardly from a bottom surface of the drill guide and defining a first drill guide hole axis, the first drill guide hole axis forming an angle other than 90 degrees with the third plane when viewed from a side plan view, wherein a first minimum angle defined by the drill guide peg axis and the third plane is the same as a second minimum angle defined by the first drill guide hole axis and the third plane.

3. The kit of claim 2 , the retroversion glenoid component further comprising:

a center peg extending away from the glenoid bone contacting surface and defining a center peg axis, the center peg axis forming an angle other than 90 degrees with the first plane when viewed from a side plan view, wherein a third minimum angle defined by the center peg axis and the first plane is the same as the first minimum angle.

4. The kit of claim 3 , wherein:

the first offset peg defines a first offset peg axis, the first offset peg axis forming an angle other than 90 degrees with the first plane when viewed from a side plan view;

the retroversion glenoid component includes a second offset peg, the second offset peg defining a second offset peg axis parallel to the first offset peg axis;

the retroversion glenoid component includes a third offset peg, the third offset peg defining a third offset peg axis parallel to the first offset peg axis;

the drill guide includes a second drill guide hole defining a second drill guide hole axis parallel to the first drill guide hole axis;

the drill guide includes a third drill guide hole defining a third drill guide hole axis parallel to the third drill guide hole axis; and

a fourth minimum angle defined by the first offset peg axis and the first plane is the same as the first minimum angle.

5. The kit of claim 3 , further comprising:

a pin placement guide, the pin placement guide including

a bone contacting surface defining a fourth plane,

a first pin guide hole extending upwardly from a bottom portion of the pin placement guide and defining a first pin guide hole axis, the first pin guide hole axis perpendicular to the fourth plane, and

a second pin guide hole extending upwardly from the bottom portion of the pin placement guide and defining a second pin guide hole axis, the second pin guide hole axis forming an angle other than 90 degrees with the fourth plane when viewed from a side plan view.

6. The kit of claim 5 wherein:

a fifth minimum angle defined by the second pin guide hole axis and the fourth plane is the same as the first minimum angle.

7. The kit of claim 3 , wherein:

the glenoid bone contacting surface defines a circular periphery;

the center peg is centered within the circular periphery; and

a nadir of the concave articulating surface is located on the center peg axis.

8. The kit of claim 3 , wherein:

the first offset peg defines a first offset peg axis;

the third minimum angle, the center peg axis, and the first offset peg axis are coplanar;

the first minimum angle, the drill guide peg axis, and the first drill guide hole axis are coplanar;

the center peg axis and the first offset peg axis define a first minimum distance therebetween;

the drill guide peg axis and the first drill guide hole axis define a second minimum distance therebetween; and

the first minimum distance is equal to the second minimum distance.

9. The kit of claim 8 , wherein:

the retroversion glenoid component includes a second offset peg, the second offset peg defining a second offset peg axis parallel to the first offset peg axis;

the retroversion glenoid component includes a third offset peg, the third offset peg defining a third offset peg axis parallel to the first offset peg axis;

the center peg axis is located between the second offset peg axis and the third offset peg axis;

a fourth plane is perpendicular to the center peg axis;

a first intersection of the second offset peg axis with the fourth plane and a second intersection of the third offset peg axis with the fourth plane are equidistant from a third intersection of the first offset peg axis with the fourth plane;

the drill guide includes a second drill guide hole defining a second drill guide hole axis parallel to the first drill guide hole axis;

the drill guide includes a third drill guide hole defining a third drill guide hole axis parallel to the third drill guide hole axis;

the drill guide peg axis is located between the second drill guide hole axis and the third drill guide hole axis;

a fifth plane is perpendicular to the drill guide peg axis; and

a fourth intersection of the second drill guide hole axis with the fifth plane and a fifth intersection of the third drill guide hole axis with the fifth plane are equidistant from a sixth intersection of the first drill guide hole axis with the fifth plane.

10. A kit for implanting a glenoid component comprising:

a retroversion glenoid component including a generally flat glenoid bone contacting surface defining a first plane, a glenoid peg extending away from the glenoid bone contacting surface and defining a glenoid peg axis, the glenoid peg axis forming an angle other than 90 degrees with the first plane when viewed from a side plan view, and a concave articulating surface; and

a drill guide configured to guide a drill in forming a bore in a scapula, the drill guide including a generally flat drill guide bone contacting surface defining a second plane and a drill guide peg extending away from a bottom portion of the drill guide and defining a drill guide peg axis, the drill guide peg axis forming an angle other than 90 degrees with the second plane when viewed from a side plan view, wherein a first minimum angle defined by the glenoid peg axis and the first plane is the same as a second minimum angle defined by the drill guide peg axis and the second plane.

11. The kit of claim 10 , wherein the drill guide comprises:

a first drill guide hole extending upwardly from a bottom surface of the drill guide and defining a first drill guide hole axis, the first drill guide hole axis parallel to the drill guide peg axis.

12. The kit of claim 11 , wherein:

the retroversion glenoid component further includes a first offset peg extending away from the glenoid bone contacting surface and defining a first offset peg axis;

the first minimum angle, the glenoid peg axis, and the first offset peg axis are coplanar;

the glenoid peg axis and the first offset peg axis define a first minimum distance therebetween;

the second minimum angle, the drill guide peg axis, and the first drill guide hole axis are coplanar;

the drill guide peg axis and the first drill guide hole axis define a second minimum distance therebetween; and

the first minimum distance is equal to the second minimum distance.

13. The kit of claim 12 , wherein:

the retroversion glenoid component includes a second offset peg, the second offset peg defining a second offset peg axis parallel to the first offset peg axis;

the retroversion glenoid component includes a third offset peg, the third offset peg defining a third offset peg axis parallel to the first offset peg axis;

the drill guide includes a second drill guide hole defining a second drill guide hole axis parallel to the first drill guide hole axis; and

the drill guide includes a third drill guide hole defining a third drill guide hole axis parallel to the third drill guide hole axis.

14. The kit of claim 13 , wherein:

the glenoid peg axis is located between the second offset peg axis and the third offset peg axis;

a third plane is perpendicular to the center peg axis;

a first intersection of the second offset peg axis with the third plane and a second intersection of the third offset peg axis with the third plane are equidistant from a third intersection of the first offset peg axis with the third plane;

the drill guide peg axis is located between the second drill guide hole axis and the third drill guide hole axis;

a fourth plane is perpendicular to the drill guide peg axis; and

a fourth intersection of the second drill guide hole axis with the fourth plane and a fifth intersection of the third drill guide hole axis with the fourth plane are equidistant from a sixth intersection of the first drill guide hole axis with the fourth plane.

15. The kit of claim 12 , further comprising:

a pin placement guide, the pin placement guide including

a bone contacting surface defining a third plane,

a first pin guide hole extending upwardly from a bottom portion of the pin placement guide and defining a first pin guide hole axis, the first pin guide hole axis perpendicular to the third plane, and

a second pin guide hole extending upwardly from the bottom portion of the pin placement guide and defining a second pin guide hole axis, the second pin guide hole axis forming an angle other than 90 degrees with the third plane when viewed from a side plan view.

16. The kit of claim 15 wherein:

a third minimum angle defined by the second pin guide hole axis and the third plane is the same as the first minimum angle.

17. The kit of claim 16 , wherein:

the glenoid bone contacting surface defines a circular periphery;

the glenoid peg is centered within the circular periphery; and

a nadir of the concave articulating surface is located on the glenoid peg axis.

18. A kit for implanting a glenoid component comprising:

a retroversion glenoid component including (i) a concave articulating surface with an upper surface having an upper edge extending about the concave articulating surface and defining a first plane, (ii) a generally flat glenoid bone contacting surface generally opposite to the concave articulating surface and coextensive with the concave articulating surface when the concave articulating surface and generally flat glenoid bone contacting surface are projected onto the first plane, the generally flat glenoid bone contacting surface defining a second plane which is not parallel to the first plane, and (iii) a first offset peg extending away from the glenoid bone contacting surface at an angle other than 90 degrees when viewed from a side plan view; and

a drill guide configured to guide a drill in forming a bore in a scapula to receive the first offset peg.

19. The kit of claim 18 , wherein the drill guide comprises:

a generally flat drill guide bone contacting surface defining a third plane;

a drill guide peg extending away from a bottom portion of the drill guide and defining a drill guide peg axis, the drill guide peg axis forming an angle other than 90 degrees with the third plane when viewed from a side plan view; and

a first drill guide hole extending upwardly from a bottom surface of the drill guide and defining a first drill guide hole axis, the first drill guide hole axis forming an angle other than 90 degrees with the third plane when viewed from a side plan view, wherein a first minimum angle defined by the drill guide peg axis and the third plane is the same as a second minimum angle defined by the first drill guide hole axis and the third plane.

20. The kit of claim 19 , the retroversion glenoid component further comprising:

a center peg extending away from the glenoid bone contacting surface and defining a center peg axis, the center peg axis forming an angle other than 90 degrees with the second plane when viewed from a side plan view, wherein a third minimum angle defined by the center peg axis and the second plane is the same as the first minimum angle.