Glenoid Component For Shoulder Arthroplasty

Abstract

A glenoid component apparatus for shoulder arthroplasty includes a bearing portion and a stem portion connected to the bearing portion. The stem portion is modeled from a normalized glenoid vault morphology. A method for making a glenoid component for shoulder arthroplasty includes obtaining a model of a normalized glenoid vault morphology and producing a stem portion of the glenoid component based on the model.

1 . A glenoid component apparatus for shoulder arthroplasty, the apparatus comprising:
 a bearing portion configured to engage a bearing element associated with the humerus; and   a stem portion connected to said bearing portion;   wherein the stem portion models a normalized glenoid vault morphology.   
     
     
         2 . The apparatus of  claim 1 , wherein the bearing portion includes a generally concave bearing surface. 
     
     
         3 . The apparatus of  claim 1 , wherein the stem portion is defined by a plurality of generally triangular cross sections spaced apart along a dimension of said stem portion. 
     
     
         4 . The apparatus of  claim 3 , wherein the stem portion includes a plurality of mutually substantially parallel triangular cross sections. 
     
     
         5 . The apparatus of  claim 4 , wherein said triangular cross sections are substantially equidistant. 
     
     
         6 . The apparatus of  claim 4 , wherein said plurality of mutually parallel triangular cross sections includes:
 a first triangular cross section having a width and having a depth about 2.8 times the width;   a second triangular cross section having a width about 2.2 times the width of the first triangular cross section and having a depth about 2 times the width of the first triangular cross section;   a third triangular cross section having a width about 2.2 times the width of the first triangular cross section and having a depth about 1.8 times the width of the first triangular cross section;   a fourth triangular cross section having a width about 1.7 times the width of the first triangular cross section and having a depth about 2 times the width of the first triangular cross section; and   a fifth triangular cross section having a width about equal to the width of the first triangular cross section and having a depth about 2.2 times the width of the first triangular cross section.   
     
     
         7 . The apparatus of  claim 6 , wherein:
 the first triangular cross section includes a vertex relatively positioned at Cartesian coordinates (X,Y,Z) of about (28, 8, 0), the first triangular cross section includes a vertex relatively positioned at Cartesian coordinates (X,Y,Z) of about (0, 15, 0), the first triangular cross section includes a vertex relatively positioned at Cartesian coordinates (X,Y,Z) of about (28, 18, 0),   the second triangular cross section includes a vertex relatively positioned at Cartesian coordinates (X,Y,Z) of about (29, 1, 8), the second triangular cross section includes a vertex relatively positioned at Cartesian coordinates (X,Y,Z) of about (9, 14, 8), the second triangular cross section includes a vertex relatively positioned at Cartesian coordinates (X,Y,Z) of about (28, 23, 8),   the third triangular cross section includes a vertex relatively positioned at Cartesian coordinates (X,Y,Z) of about (29, 0.5, 16), the third triangular cross section includes a vertex relatively positioned at Cartesian coordinates (X,Y,Z) of about (10.5, 11, 16), the third triangular cross section includes a vertex relatively positioned at Cartesian coordinates (X,Y,Z) of about (28, 23, 16),   the fourth triangular cross section includes a vertex relatively positioned at Cartesian coordinates (X,Y,Z) of about (29, 2.5, 24), the fourth triangular cross section includes a vertex relatively positioned at Cartesian coordinates (X,Y,Z) of about (8, 7, 24), the fourth triangular cross section includes a vertex relatively positioned at Cartesian coordinates (X,Y,Z) of about (28, 20, 24),   the fifth triangular cross section includes a vertex relatively positioned at Cartesian coordinates (X,Y,Z) of about (29, 3.5, 32.5), the fifth triangular cross section includes a vertex relatively positioned at Cartesian coordinates (X,Y,Z) of about (6, 0, 32.5), and the fifth triangular cross section includes a vertex relatively positioned at Cartesian coordinates (X,Y,Z) of about (28.5, 14, 32.5).   
     
     
         8 . The apparatus of  claim 1 , wherein the stem portion is hollow. 
     
     
         9 . A method for making a glenoid component for shoulder arthroplasty, the method comprising:
 obtaining a model of a glenoid vault morphology normalized from a population of a plurality of scapulae; and   producing a stem portion of the glenoid component based on the model.   
     
     
         10 . The method of  claim 9 , wherein the step of obtaining a model includes generating the model of the normalized glenoid vault morphology defined by a plurality of cross sections. 
     
     
         11 . The method of  claim 10 , wherein each of the plurality of cross sections is a substantially triangular cross section. 
     
     
         12 . The method of  claim 11 , wherein the substantially triangular cross sections are mutually substantially parallel. 
     
     
         13 . The method of  claim 12 , wherein the substantially triangular cross sections are substantially equidistant. 
     
     
         14 . The method of  claim 11  wherein the mutually parallel triangular cross sections includes exactly five triangular cross sections. 
     
     
         15 . A glenoid component apparatus for a shoulder joint including at least one of a natural humeral component and a prosthetic humeral component, the apparatus comprising:
 means for bearing against at least one of the natural humeral component and the prosthetic humeral component; and   means, connected to the bearing means, for engaging the glenoid vault, including a body modeled from a normalized glenoid vault morphology.