Integral, One-Piece Humeral Head Device

Abstract

A humeral head augment device for use in a modular shoulder prosthesis. The humeral head augment device has an external bearing surface with at least one surface portion that includes a radius of curvature. The radius of curvature is configured to constrain translational movement of the implanted shoulder prosthesis when the humeral head augment device is positioned within the shoulder prosthesis. The humeral head augment device also includes a coupling mechanism designed to lock the humeral head augment device to either the stem or the humeral head, thereby ensuring proper operational positioning of the device within the shoulder prosthesis and allowing the implanted shoulder prosthesis to function in a patient suffering from rotator cuff arthropathy. A shoulder prosthesis using a humeral head augment device, a method for assembling a shoulder prosthesis and method for using a humeral head augment device in a shoulder prosthesis are also disclosed.

1 - 53 . (canceled) 
     
     
         54 . An integral, one-piece humeral head device comprising:
 a humeral head having an articulation surface comprising a first portion and a second augmented portion, the first portion comprising a first radius of curvature and the second portion comprising multiple radii of curvature; and   a tapered post extending from the humeral head and configured to engage a bone.   
     
     
         55 . The device as recited in  claim 54 , wherein the first radius of curvature and the multiple radii of curvature lie in a plane. 
     
     
         56 . The device as recited in  claim 55 , wherein the plane comprises a medial plane. 
     
     
         57 . The device as recited in  claim 54 , wherein the first radius comprises a single radius. 
     
     
         58 . The device as recited in  claim 54 , wherein the first portion comprises a glenoid-bearing portion, and the second portion comprises a acromion-bearing portion. 
     
     
         59 . The device as recited in  claim 54 , wherein the first portion and the second portion comprise articulating surfaces. 
     
     
         60 . The device as recited in  claim 54 , wherein the second portion comprises multiple portions, each of the multiple portions comprising one of the multiple radii. 
     
     
         61 . The device as recited in  claim 60 , wherein at least one of the multiple portions constrains translation of an implanted device. 
     
     
         62 . The device as recited in  claim 61 , wherein at least one of the multiple portions constrains superior translation of the implanted device. 
     
     
         63 . The device as recited in  claim 62 , wherein at least one of the multiple portions constrains superior translation of the implanted device during abduction of a device recipient's arm. 
     
     
         64 . The device as recited in  claim 60 , wherein the second portion comprises two portions, each of the two portions comprising one of the multiple radii. 
     
     
         65 . The device as recited in  claim 60 , wherein the second portion comprises greater than two portions, each of the greater than two portions comprising one of the multiple radii.