Modified Glenoid Components and Methods of Installing Same

Abstract

A glenoid component for securement to a glenoid surface of a scapula comprises a body portion having a first surface adapted to contact the glenoid surface of a scapula and a second surface configured to receive the head portion of a humerus. The glenoid component further includes an anchor peg for penetrating the glenoid surface of the scapula so as to secure the body portion to the glenoid surface of the scapula. The anchor peg includes a cylindrical shaft extending from the first surface of the body portion and a fin secured to and extending outwardly from the cylindrical shaft. The glenoid component further includes a feature that prevents rotation of the glenoid component.

1 . A glenoid component for securement to a glenoid surface of a scapula so as to provide a bearing surface for a head portion of a humerus, the glenoid component comprising:
 a body portion having (i) a first surface adapted to contact the glenoid surface of a scapula and (ii) a second surface configured to receive the head portion of the humerus; and   an anchor peg for penetrating the glenoid surface of the scapula so as to secure the body portion to the glenoid surface of the scapula, wherein the anchor peg includes (i) a cylindrical shaft extending from the first surface of the body portion and (ii) a fin secured to and extending outwardly from the cylindrical shaft, the fin being generally square-shaped.   
     
     
         2 . The glenoid component of  claim 1 , further including a plurality of generally square-shaped fins secured to and extending outwardly from the cylindrical shaft of the anchor peg. 
     
     
         3 . The glenoid component of  claim 2 , wherein the generally square-shaped fins have rounded corners. 
     
     
         4 . The glenoid component of  claim 3 , wherein the anchor peg is adapted for insertion into a hole within a glenoid surface of a scapula and wherein the fins have a width that is greater than a width or diameter of a hole in which the anchor peg is inserted and further wherein the fins are configured to prevent rotation of the glenoid component within the glenoid surface. 
     
     
         5 . The glenoid component of  claim 2 , wherein side edges of the fins are configured to have an interference with a wall forming a hole in which the anchor peg is inserted of between about 0.25 millimeters and about 2 millimeters. 
     
     
         6 . The glenoid component of  claim 5 , wherein rounded corners of the fins are configured to have an interference with the wall forming the hole in which the anchor peg is inserted of between about 0.5 millimeters and about 3 millimeters, and wherein the interference between the side walls and the rounded corners with the wall forming the hole prevent rotation of the glenoid component. 
     
     
         7 . The glenoid component of  claim 2 , wherein the anchor peg is configured for insertion into a generally square-shaped hole in the glenoid surface of the scapula. 
     
     
         8 . A glenoid component for securement to a glenoid surface of a scapula so as to provide a bearing surface for a head portion of a humerus, the glenoid component comprising:
 a body portion having (i) a first surface adapted to contact the glenoid surface of a scapula and (ii) a second surface configured to receive the head portion of the humerus;   an anchor peg for penetrating the glenoid surface of the scapula so as to secure the body portion to the glenoid surface of the scapula, wherein the anchor peg includes (i) a cylindrical shaft extending from the first surface of the body portion and (ii) a fin secured to and extending outwardly from the cylindrical shaft; and   at least one gusset secured to and extending downwardly from the first surface of the body portion and secured to and extending outwardly from the cylindrical shaft of the anchor peg.   
     
     
         9 . The glenoid component of  claim 8 , wherein an angled edge is formed by the gusset and extends between the first surface of the body portion and the anchor peg. 
     
     
         10 . The glenoid component of  claim 9 , wherein the angled edge of the gusset is configured to be driven into the glenoid surface of the scapula to prevent rotation of the glenoid component. 
     
     
         11 . The glenoid component of  claim 10 , further including a plurality of gussets secured to and extending downwardly from the first surface of the body portion and secured to and extending outwardly from the cylindrical shaft of the anchor peg. 
     
     
         12 . The glenoid component of  claim 11 , wherein the gussets are orthogonal to the first surface of the body portion and the cylindrical shaft of the anchor peg. 
     
     
         13 . The glenoid component of  claim 12 , further including four gussets spaced about a longitudinal axis of the anchor peg with about ninety degrees between adjacent gussets. 
     
     
         14 . The glenoid component of  claim 13 , wherein the gussets are configured to be driven into the glenoid surface of the scapula to prevent rotation of the glenoid component. 
     
     
         15 . A glenoid component for securement to a glenoid surface of a scapula so as to provide a bearing surface for a head portion of a humerus, the glenoid component comprising:
 a body portion having (i) a first surface adapted to contact the glenoid surface of a scapula and (ii) a second surface configured to receive the head portion of the humerus;   an anchor peg for penetrating the glenoid surface of the scapula so as to secure the body portion to the glenoid surface of the scapula, wherein the anchor peg includes (i) a cylindrical shaft extending from the first surface of the body portion and (ii) a fin secured to and extending outwardly from the cylindrical shaft, wherein the fin includes at least one cutout configured to allow the fin to deflect outwardly along a hole in which the glenoid component is secured, thereby preventing rotation of the glenoid component.   
     
     
         16 . The glenoid component of  claim 15 , further including first and second opposing cutouts, wherein each of the cutouts includes a first leg and a second leg forming generally triangular cutouts. 
     
     
         17 . The glenoid component of  claim 16 , wherein the cutouts are symmetrical about an axis that bisects the fins. 
     
     
         18 . The glenoid component of  claim 16 , wherein the body portion of the glenoid component is generally circular. 
     
     
         19 . The glenoid component of  claim 15 , further including first and second opposing cutouts, wherein each of the cutouts is generally U-shaped. 
     
     
         20 . A tool for preparing a glenoid surface of a scapula, the tool comprising:
 a handle; and   a punch operatively connected to the handle, wherein the fin punch includes a plate having a cylinder extending from the disc and at least one gusset extending outwardly from the cylinder.   
     
     
         21 . The tool of  claim 20 , further including four gussets extending outwardly from the cylinder. 
     
     
         22 . The tool of  claim 21 , wherein the gussets are generally orthogonal to the disc and extend outwardly and are orthogonal to the cylinder and wherein each of the four gussets is disposed about 90 degrees from an adjacent gusset.