Patent ID: 8689425

Claim:
A method of manufacturing a shoulder prosthesis, the method comprising: forming at least one one-piece humeral head, the at least one one-piece humeral head comprising an external articulation surface portion with a radius of curvature, an outer bearing surface portion with at least two radii of curvature, and an inner surface with a first connector extending therefrom; and forming at least one stem, the at least one stem comprising a shaft, a proximal end, and a distal end defining a longitudinal axis therebetween, the proximal end having a second connector configured to engage the first connector of the at least one one-piece humeral head to assemble the shoulder prosthesis, wherein the shoulder prosthesis is configured such that the radius of curvature of the external articulation surface portion extends at least across the longitudinal axis of the stem when the shoulder prosthesis is assembled, wherein the outer bearing surface portion of the at least one one-piece humeral head comprises at least a first bearing surface portion of a first radius of curvature and a second bearing surface portion of a second radius of curvature that is different from the first radius of curvature, the first bearing surface portion being positioned adjacent the external articulation surface portion and the second bearing surface portion being positioned adjacent the first bearing surface portion, and wherein the first radius of curvature of the first bearing surface portion is greater than the radius of curvature of the external articulation surface portion at least immediately adjacent the first bearing surface portion to constrain translation of the shoulder prosthesis when assembled and implanted.