Shoulder prosthesis components and assemblies
Various embodiments disclosed herein relate to stemmed and stemless humeral anchors for use in shoulder arthroplasty procedures. For example, the humeral anchor can include a first end, a second end, and an interior surface extending between the first end and the second end. The interior surface can be disposed about a recess disposed between the first end and the second end. The recess can be configured to secure a coupling of a shoulder articular body directly to the interior surface.
1. A humeral anchor comprising:
a first end including a collar;
a second end;
an interior surface extending between the first end and the second end, the interior surface defining a recess that extends through an entirety of the humeral anchor between the first end and the second end;
an exterior surface including a first tapered portion extending from the collar to a lateral projection and a second tapered portion extending from the lateral projection to the second end, the lateral projection defining a discontinuity between the first tapered portion and the second tapered portion; and
a slot extending along the interior surface between the collar and the lateral projection and configured to engage a corresponding ridge of a coupling of a shoulder articular body, wherein
the recess is configured to secure the coupling of the shoulder articular body directly to the interior surface, and
the slot has a length that extends between the collar and the lateral projection and a width that extends circumferentially along the interior surface, the length being longer than the width.
2. The humeral anchor of claim 1 , wherein the collar includes a transverse surface configured to engage a humeral bone layer exposed by resection or other preparation when the humeral anchor is implanted to resist subsidence.
3. The humeral anchor of claim 2 , wherein the transverse surface extends an entire width of the collar.
4. The humeral anchor of claim 2 , wherein the transverse surface comprises an anti-rotation feature disposed between the first end and the second end of the humeral anchor.
5. The humeral anchor of claim 1 , wherein the interior surface comprises a tapered surface for engaging an articular assembly.
6. The humeral anchor of claim 1 , wherein the exterior surface further includes a porous surface at least partially bounded by a non-porous edge, the non-porous edge being between the porous surface and the second end.
7. The humeral anchor of claim 1 , wherein the interior surface comprises a first taper disposed towards the first end and a second taper disposed towards the second end.
8. The humeral anchor of claim 1 , wherein a diameter of the first tapered portion at the exterior surface is greater than a diameter of the second tapered portion at the exterior surface.
9. The humeral anchor of claim 1 , wherein the first tapered portion has a first angle away from an axis disposed from the first end to the second end and the second tapered portion has a second angle away from the axis disposed from the first end to the second end, the second angle being greater than the first angle.
10. The humeral anchor of claim 1 , wherein the interior surface comprises a groove configured to receive a locking ring of an articular body assembly.
11. The humeral anchor of claim 1 , further comprising a plurality of struts extending along the exterior surface of the humeral anchor between the collar and the lateral projection.
12. The humeral anchor of claim 11 , further comprising a porous surface being disposed between at least two struts of the plurality of struts.
13. The humeral anchor of claim 11 , wherein the plurality of struts are configured to reduce, minimize or eliminate rotation of the humeral anchor.
14. The humeral anchor of claim 1 , further comprising a plurality of first struts extending along a portion of the exterior surface of the humeral anchor.
15. The humeral anchor of claim 14 , wherein
the plurality of first struts are located on the first tapered portion.
16. The humeral anchor of claim 15 , wherein a second strut is located on the second tapered portion.
17. The humeral anchor of claim 16 , wherein
the second strut is a plurality of second struts, and
a number of the plurality of first struts is twice as many struts as a number of the plurality of second struts.
18. The humeral anchor of claim 1 , wherein the humeral anchor further comprises a fin on the exterior surface extending between the lateral projection and the second end of the humeral anchor and configured to reduce, minimize or eliminate rotation of the humeral anchor when the humeral anchor is implanted in bone of a humerus.
19. A kit comprising:
a first humeral anchor including:
a first end including a first collar;
a second end;
an interior surface extending between the first end and the second end, the interior surface defining a recess that extends through an entirety of the first humeral anchor between the first end and the second end;
a first exterior surface including a first tapered portion extending from the first collar to a lateral projection and a second tapered portion extending from the lateral projection to the second end, the lateral projection defining a discontinuity between the first tapered portion and the second tapered portion; and
a slot extending along the interior surface between the first collar and the lateral projection and configured to engage a corresponding ridge of a coupling of a shoulder articular body, wherein
the recess is configured to secure the coupling of the shoulder articular body directly to the interior surface;
the slot has a length that extends between the first collar and the lateral projection and a width that extends circumferentially along the interior surface, the length being longer than the width; and
a second humeral anchor including:
a first end including a second collar;
a second end;
an interior surface extending between the first end and the second end of the second humeral anchor, the interior surface of the second humeral anchor defining a recess that extends through an entirety of the second humeral anchor between the first end and the second end of the second humeral anchor;
a second exterior surface including a first tapered portion extending from the second collar to a second lateral projection and a second tapered portion extending from the second lateral projection to the second end of the second humeral anchor, the second lateral projection defining a discontinuity between the first tapered portion and the second tapered portion of the second humeral anchor; and
a slot extending along the interior surface of the second humeral anchor between the second collar and the second lateral projection and configured to engage a corresponding ridge of a coupling of a shoulder articular body, wherein
the recess of the second humeral anchor is configured to secure a coupling of a shoulder articular body directly to the interior surface of the second humeral anchor;
the slot of the second humeral anchor has a length that extends between the second collar and the second lateral projection and a width that extends circumferentially along the interior surface of the second humeral anchor, the length being longer than the width; and wherein
the first humeral anchor and the second humeral anchor have identical interior surfaces;
the first collar and the second collar have the same outer perimeter dimensions; and
the second exterior surface of the second humeral anchor is larger than the first exterior surface of the first humeral anchor.