Glenoid Implant with Additively Manufactured Fixation Posts

Abstract

A glenoid implant system may include a main body formed of a polymer, a base, and an anchor formed of metal. The main body may define an articulating surface and an opposite bone-contacting surface. The base may be formed in the bone-contacting surface of the main body, the base including a hole formed therein. The anchor may have a main section and a threaded post extending from the main section. The anchor may include a plurality of ribs extending in a longitudinal direction of the main section, the plurality of ribs being spaced apart from one another in a circumferential direction of the main section. The anchor may further include a plurality of wedges disposed on a base of the anchor, the plurality of wedges adapted to contact the base formed in the bone-contacting surface of the main body when the threaded post is received within the threaded hole.

1 . A glenoid implant system comprising:
 a main body defining an articulating surface configured to articulate with a humeral head, and an opposite bone-contacting surface adapted to contact the glenoid of a patient and defining a periphery of the main body;   a base formed in the bone-contacting surface of the main body; and   an anchor having a main section and an anti-rotation feature disposed on a base of the anchor, the anti-rotation feature adapted to contact the base formed in the bone-contacting surface of the main body when the anchor is coupled to the base; and   an augment portion positioned on the main body, formed separately from the main body, the augment portion having a bone-contacting surface defining a first convexity, the bone-contacting surface of the main body having a second convexity, the first convexity being different than the second convexity,   wherein the bone-contacting surface of augment portion and the bone-contacting surface of the main body portion intersect at an interface, the interface extending from a first location at the periphery of the main body to a second location remote from the first location.   
     
     
         2 . The glenoid implant system of  claim 1 , wherein the main body is formed from a polymer material. 
     
     
         3 . The glenoid implant system of  claim 2 , wherein the augment portion is formed from a metal material. 
     
     
         4 . The glenoid implant system of  claim 3 , wherein the main body is overmolded on the augment portion. 
     
     
         5 . The glenoid implant system of  claim 1 , wherein the first convexity is adapted to contact a neoglenoid portion of the glenoid. 
     
     
         6 . The glenoid implant system of  claim 4 , wherein the second convexity is adapted to contact a paleoglenoid portion of the glenoid. 
     
     
         7 . The glenoid implant system of  claim 1 , wherein the anchor further includes a threaded post extending from the main section, the threaded post being configured to be received within a hole formed in the base formed in the bone-contacting surface of the main body. 
     
     
         8 . The glenoid implant system of  claim 7 , wherein the anchor includes a plurality of ribs extending in a longitudinal direction of the main section, the plurality of ribs being spaced apart from one another in a circumferential direction of the main section. 
     
     
         9 . The glenoid implant system of  claim 8 , wherein the anti-rotation feature includes a plurality of wedges. 
     
     
         10 . The glenoid implant system of  claim 1 , wherein the augment portion includes an augment anchor adapted to engage a neoglenoid portion of a humerus. 
     
     
         11 . The glenoid implant system of  claim 10 , wherein the augment anchor is integral with the augment portion. 
     
     
         12 . A glenoid implant system comprising:
 a main body defining an articulating surface configured to articulate with a humeral head, and an opposite bone-contacting surface adapted to contact the glenoid of a patient and defining a periphery of the main body;   a base formed in the bone-contacting surface of the main body; and   an anchor having a main section and an anti-rotation feature disposed on a base surface of the anchor, the anti-rotation feature adapted to contact the base formed in the bone-contacting surface of the main body when a threaded post extending from the main section is detachably attached to the base, the anchor including at least one ridge extending along a side wall of the main section; and   an augment portion positioned on the main body having a bone-contacting surface defining a first convexity, the bone-contacting surface of the main body having a second convexity, the first convexity being different than the second convexity.   
     
     
         13 . The glenoid implant system of  claim 12 , wherein the bone contacting surface of the augment portion and the bone contacting surface of the main body portion intersect at an interface, the interface extending from a first location at the periphery of the main body to a second location remote from the first location. 
     
     
         14 . The glenoid implant system of  claim 12 , wherein the threaded post is configured to be received within a hole formed in the base formed in the bone-contacting surface of the main body. 
     
     
         15 . The glenoid implant system of  claim 12 , wherein the anchor includes a center anchor and at least one peripheral anchor, and the base formed in the bone-contacting surface of the main body includes a center base and at least one peripheral base, the center base being positioned in a central area of the bone-contacting surface of the main body. 
     
     
         16 . The glenoid implant system of  claim 12 , wherein the anti-rotation feature includes a plurality of wedges. 
     
     
         17 . The glenoid implant system of  claim 16 , wherein each of the plurality of wedges includes a first edge extending a first distance from the base of the anchor, and a second edge opposite the first edge extending a second distance from the base of the anchor, the second distance being greater than the first distance. 
     
     
         18 . The glenoid implant system of  claim 17 , wherein each of the plurality of wedges is oriented so that, upon rotation of the anchor in a first direction to couple the anchor to the base, the first edges of the plurality of wedges lead the rotation, and the second edges of the plurality of wedges trail the rotation. 
     
     
         19 . The glenoid implant system of  claim 18 , wherein when the anchor is coupled to the main body so that the base of the anchor is in contact with the base formed in the bone-contacting surface of the main body, the plurality of wedges extend a distance into the main body to prevent rotation of the anchor in a second direction opposite the first direction. 
     
     
         20 . The glenoid implant system of  claim 17 , wherein each of the plurality of wedges includes a ramped surface extending between the first and second edges and inclined from the second edge toward the first edge.