Reverse shoulder orthopaedic implant having an elliptical glenosphere component

Abstract

A reverse shoulder orthopaedic implant includes a glenosphere component having a lateral bearing surface configured to articulate with a humeral cup of a humeral prosthesis. A metaglene component includes a platform configured to receive glenosphere component.

1 . A reverse shoulder orthopaedic implant, comprising:
 a glenosphere component having (i) a curved lateral bearing surface configured to articulate with a humeral cup of a humeral prosthesis, and (ii) a medial surface having a tapered bore formed therein,   wherein the glenosphere component has (i) an anterior/posterior width defined by the distance between an anterior-most point of the lateral bearing surface and a posterior-most point of the lateral bearing surface, (ii) a superior/inferior width defined by the distance between a superior-most point of the lateral bearing surface and an inferior-most point of the lateral bearing surface, and (iii) the anterior/posterior width of the glenosphere component is greater than the superior/inferior width of the glenosphere component.   
     
     
         2 . The reverse shoulder orthopaedic implant of  claim 1 , wherein the lateral bearing surface is hemi-ellipsoidal in shape. 
     
     
         3 . The reverse shoulder orthopaedic implant of  claim 1 , wherein:
 an imaginary line segment extends from a superior-most point of the medial surface to an inferior-most point of the medial surface, and   the center of the tapered bore is positioned between the midpoint of the imaginary line segment and the superior-most point of the medial surface.   
     
     
         4 . The reverse shoulder orthopaedic implant of  claim 1 , wherein:
 an imaginary line segment extends from a superior-most point of the medial surface to an inferior-most point of the medial surface, and   the center of the tapered bore is positioned at the midpoint of the imaginary line segment.   
     
     
         5 . The reverse shoulder orthopaedic implant of  claim 1 , wherein the glenosphere component is metallic. 
     
     
         6 . The reverse shoulder orthopaedic implant of  claim 1 , further comprising a metaglene component having an annular-shaped platform with an elongated stem extending outwardly from a medial surface thereof, wherein a tapered outer surface of the annular-shaped platform is taper locked in the tapered bore of the glenosphere component. 
     
     
         7 . A reverse shoulder orthopaedic implant, comprising:
 a glenosphere component having (i) a curved lateral bearing surface configured to articulate with a humeral cup of a humeral prosthesis, and (ii) a medial surface having a bore formed therein to receive a metaglene component,   wherein the glenosphere component has (i) an anterior/posterior width defined by the distance between an anterior-most point of the glenosphere component and a posterior-most point of the glenosphere component, (ii) a superior/inferior width defined by the distance between a superior-most point of the glenosphere component and an inferior-most point of the glenosphere component, and (iii) the anterior/posterior width of the glenosphere component is greater than the superior/inferior width of the glenosphere component.   
     
     
         8 . The reverse shoulder orthopaedic implant of  claim 7 , wherein the lateral bearing surface is hemi-ellipsoidal in shape. 
     
     
         9 . The reverse shoulder orthopaedic implant of  claim 7 , wherein:
 an imaginary line segment extends from a superior-most point of the medial surface to an inferior-most point of the medial surface, and   the center of the bore is positioned between the midpoint of the imaginary line segment and the superior-most point of the medial surface.   
     
     
         10 . The reverse shoulder orthopaedic implant of  claim 7 , wherein:
 an imaginary line segment extends from a superior-most point of the medial surface to an inferior-most point of the medial surface, and   the center of the bore is positioned at the midpoint of the imaginary line segment.   
     
     
         11 . The reverse shoulder orthopaedic implant of  claim 7 , wherein the glenosphere component is metallic. 
     
     
         12 . The reverse shoulder orthopaedic implant of  claim 7 , further comprising a metaglene component having an annular-shaped platform with an elongated stem extending outwardly from a medial surface thereof, wherein:
 the bore formed in the glenosphere component comprises a tapered bore, and   a tapered outer surface of the annular-shaped platform is taper locked in the tapered bore of the glenosphere component.   
     
     
         13 . A reverse shoulder orthopaedic implant, comprising:
 a glenosphere component having a lateral bearing surface configured to articulate with a humeral cup of a humeral prosthesis, the lateral bearing surface being hemi-ellipsoidal in shape with its longitudinal axis extending in the anterior/posterior direction, and   a metaglene component secured to the glenosphere component.   
     
     
         14 . The reverse shoulder orthopaedic implant of  claim 13 , wherein:
 an anterior/posterior width of the glenosphere component is defined by the distance between an anterior-most point of the lateral bearing surface and a posterior-most point of the lateral bearing surface,   a superior/inferior width of the glenosphere component is defined by the distance between a superior-most point of the lateral bearing surface and an inferior-most point of the lateral bearing surface, and   the anterior/posterior width of the glenosphere component is greater than the superior/inferior width of the glenosphere component.   
     
     
         15 . The reverse shoulder orthopaedic implant of  claim 13 , wherein:
 a medial surface of the glenosphere component has a tapered bore formed therein, and   a tapered outer surface of the metaglene component is taper locked in the tapered bore of the glenosphere component.   
     
     
         16 . The reverse shoulder orthopaedic implant of  claim 15 , wherein:
 an imaginary line segment extends from a superior-most point of the medial surface to an inferior-most point of the medial surface, and   the center of the tapered bore is positioned between the midpoint of the imaginary line segment and the superior-most point of the medial surface.   
     
     
         17 . The reverse shoulder orthopaedic implant of  claim 15 , wherein:
 an imaginary line segment extends from a superior-most point of the medial surface to an inferior-most point of the medial surface, and   the center of the tapered bore is positioned at the midpoint of the imaginary line segment.   
     
     
         18 . The reverse shoulder orthopaedic implant of  claim 13 , wherein both the glenosphere component and the metaglene component are metallic. 
     
     
         19 . The reverse shoulder orthopaedic implant of  claim 13 , wherein the metaglene component has a number of screw holes extending therethrough.