Shoulder arthroplasty implant system
A stemless implant for shoulder arthroplasty includes a body having a proximal portion, distal portion, and an outer surface. A cylindrical extrusion is substantially perpendicular to and adjacent the proximal portion. At least a portion of the outer surface is configured to contact bone, the outer bone contacting surface comprising a concave taper. The stemless implant can be sized and shaped for insertion into a metaphysis of a humerus bone without penetrating a diaphysis of the humerus bone. The implant optionally comprises a medial fin, a lateral fin, an anterior fin, and a posterior fin. The medial fin and lateral fin may be thicker than the anterior fin. The fins may taper from the proximal portion to the distal portion.
1. A system for shoulder arthroplasty, said system comprising:
a kit comprising:
a stemmed implant;
a stemless implant; and
a delivery instrument configured to deliver either of the stemmed implant or the stemless implant;
wherein the stemmed implant comprises a proximal portion, a distal portion, and a stem configured for insertion into an intramedullary canal of a humerus bone;
wherein the stemless implant comprises a proximal portion and a distal portion and is configured for insertion into a metaphysis of the humerus without penetrating a diaphysis of the humerus;
wherein the proximal portion of the stemmed implant and the proximal portion of the stemless implant comprise essentially the same size and shape such that they fit into a cavity in the humerus bone formed by a reamer or a stemless broach;
wherein each of the proximal portion of the stemmed implant and the proximal portion of the stemless implant comprises a concave taper decreasing in size in a direction extending from the proximal portion toward the distal portion; and
wherein the concave taper of each of the proximal portion of the stemmed implant and the proximal portion of the stemless implant is symmetric about a frontal plane extending between an anterior portion and a posterior portion of the respective implant, and the concave taper is asymmetric about a median plane extending between a medial portion and a lateral portion of the respective implant.
2. The system of claim 1 , further comprising the stemless broach.
3. The system of claim 1 , further comprising the reamer.
4. The system of claim 1 , wherein the stemmed implant further comprises a lateral fin extending radially outward from a lateral portion of the proximal portion, an anterior fin extending radially outward from an anterior portion of the proximal portion, a posterior fin extending radially outward from a posterior portion of the proximal portion, and a medial fin extending radially outward from an medial portion of the proximal portion.
5. The system of claim 1 , wherein the stemmed implant further comprises a cylindrical extrusion substantially perpendicular to and adjacent the proximal portion.
6. The system of claim 1 , wherein the stemless implant further comprises a lateral fin extending radially outward from a lateral portion of the proximal portion, an anterior fin extending radially outward from an anterior portion of the proximal portion, a posterior fin extending radially outward from a posterior portion of the proximal portion, and a medial fin extending radially outward from an medial portion of the proximal portion.
7. The system of claim 1 , wherein the stemless implant further comprises a cylindrical extrusion substantially perpendicular to and adjacent the proximal portion.