Glenoid component for shoulder arthroplasty

• US 20080140209A1
• Filed: 09/20/2006
• Published: 06/12/2008
• Est. Priority Date: 09/20/2006
• Status: Active Grant

• Current Assignee: Depuy Products Incorporated (Johnson & Johnson)
• Original Assignee: Depuy Products Incorporated (Johnson & Johnson)
• Inventors: Iannotti, Joseph P., Powell, Kimerly A.
• Granted Patent: US 7,604,665 B2
• Time in Patent Office: Days
• US Class Current: 623/19.11
• CPC Class Codes: A61B 34/10 Computer-aided planning, simulation or modelling of surgical operations
• CPC Class Codes: A61F 2/3094 Designing or manufacturing processes
• CPC Class Codes: A61F 2/4081 Glenoid components, e.g. cups
• CPC Class Codes: A61F 2002/30156 triangular
• CPC Class Codes: A61F 2002/30604 modular
• CPC Class Codes: A61F 2002/30948 using computerized tomography, i.e. CT scans
• CPC Class Codes: A61F 2002/30952 using CAD-CAM techniques or NC-techniques
• CPC Class Codes: A61F 2002/30957 using a positive or a negative model, e.g. moulds
• CPC Class Codes: A61F 2002/30962 using stereolithography
• CPC Class Codes: A61F 2230/0023 triangular
• CPC Class Codes: A61F 2240/002 Designing or making customized prostheses
• CPC Class Codes: B33Y 80/00 Products made by additive manufacturing
• CPC Class Codes: G06T 17/00 Three dimensional [3D] modelling, e.g. data description of 3D objects
• CPC Class Codes: Y10T 29/49 Method of mechanical manufacture

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.

Claims

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.