US2016184104A1PendingUtilityA1

Method for Optimization of Joint Arthroplasty Component Design

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Assignee: MAYO FOUNDATIONPriority: Sep 1, 2010Filed: Mar 7, 2016Published: Jun 30, 2016
Est. expirySep 1, 2030(~4.1 yrs left)· nominal 20-yr term from priority
Inventors:John W. Sperling
A61F 2/30942A61F 2002/30948A61F 2/4657Y10T29/49A61F 2002/30943A61F 2/40A61F 2002/4663B23P 11/00A61F 2/4081
53
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Claims

Abstract

Methods and devices are disclosed for the optimization of shoulder arthroplasty component design through the use of computed tomography scan data from arthritic shoulders.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
         1 . A method for manufacturing a prosthetic component for replacing a part of a bone of a joint in a subject, the method comprising:
 forming the prosthetic component to include a base surface and an opposed articular surface wherein a width of the base surface is a predetermined percentage of a length of a neutral face plate line, the length of the neutral face plate line having been determined by (i) obtaining an image of the bone of the joint, (ii) orienting on the image a reference angle from a body of the bone to create the neutral face plate line, wherein the neutral face plate line extends from a first border of the bone to an opposite second border of the bone, and (iii) measuring the length of the neutral face plate line.   
     
     
         2 . The method of  claim 1  wherein:
 the predetermined percentage is 100% or less. 
 
     
     
         3 . The method of  claim 1  wherein:
 the predetermined percentage is 90%-99%. 
 
     
     
         4 . The method of  claim 1  wherein:
 the predetermined percentage is 80%-99%. 
 
     
     
         5 . The method of  claim 1  wherein the joint is arthritic. 
     
     
         6 . The method of  claim 1  wherein:
 at least a section of the base surface of the prosthetic component is flat. 
 
     
     
         7 . The method of  claim 1  wherein:
 the neutral face plate line corresponds to a width of a flat neutral face plate formed by removing a portion of the bone during arthroplasty. 
 
     
     
         8 . The method of  claim 1  wherein:
 the bone is the scapula, and 
 the joint is the shoulder. 
 
     
     
         9 . The method of  claim 1  wherein:
 the prosthetic component is a glenoid component. 
 
     
     
         10 . The method of  claim 1  wherein:
 the image is a computed tomography scan slice. 
 
     
     
         11 . The method of  claim 1  wherein:
 the reference angle is 90 degrees. 
 
     
     
         12 . The method of  claim 1  wherein:
 the neutral face plate line is a straight line positioned completely within a perimeter of the image of the bone from the first border of the bone to the second border of the bone. 
 
     
     
         13 . The method of  claim 12  wherein:
 at least a section of the straight line is spaced from a portion of the perimeter of the image of the bone, the portion of the perimeter of the image of the bone representing a natural articular surface of the bone. 
 
     
     
         14 . A method for manufacturing a prosthetic component for replacing a part of a bone of a joint in a subject, the method comprising:
 forming the prosthetic component to include an articular section and a projection extending away from the articular section wherein a length of the projection is a predetermined percentage of a first reference length, the first reference length having been determined by (i) obtaining an image of the bone of the joint, (ii) orienting on the image a reference angle from a body of the bone to create a neutral face plate line that extends from a first border of the bone to an opposite second border of the bone, (iii) orienting on the image the first reference line, the first reference line being perpendicular to the neutral face plate line and extending over the bone in the image, (iv) measuring the first reference length of the first reference line from the neutral face plate line perpendicular to a depth of a cavity in the bone.   
     
     
         15 . The method of  claim 14  wherein:
 the predetermined percentage is 90%-99%. 
 
     
     
         16 . The method of  claim 14  wherein:
 the predetermined percentage is 80%-99%. 
 
     
     
         17 . The method of  claim 14  wherein:
 the projection comprises a post. 
 
     
     
         18 . The method of  claim 14  further comprising:
 forming the prosthetic component such that the length of the projection is a predetermined percentage of a second reference length, 
 wherein the second reference length has been determined by (i) orienting on the image a second reference line parallel to the first reference line and extending over the bone in the image, (ii) measuring the second reference length of the second reference line from the neutral face plate line to the depth of a cavity in the bone. 
 
     
     
         19 . The method of  claim 14  wherein:
 the bone is the scapula, and 
 the joint is the shoulder. 
 
     
     
         20 . The method of  claim 14  wherein:
 the prosthetic component is a glenoid component. 
 
     
     
         21 . The method of  claim 14  wherein:
 the image is a computed tomography scan slice. 
 
     
     
         22 . The method of  claim 14  wherein:
 the joint is arthritic. 
 
     
     
         23 . The method of  claim 14  wherein:
 the neutral face plate line is a straight line positioned completely within a perimeter of the image of the bone from the first border of the bone to the second border of the bone. 
 
     
     
         24 . The method of  claim 23  wherein:
 at least a section of the straight line is spaced from a portion of the perimeter of the image of the bone, the portion of the perimeter of the image of the bone representing a natural articular surface of the bone. 
 
     
     
         25 . A method for manufacturing a glenoid component for replacing a part of a scapula of a shoulder joint in a subject, the method comprising:
 forming the glenoid component to have a width that is a predetermined percentage of a length of a second reference line, the length of the second reference line having been determined by (i) obtaining an image of the glenoid of the scapula, (ii) orienting on the image a first reference line that extends perpendicularly from an inferior border of the glenoid image over the scapula in the image, (ii) orienting on the image the second reference line, the second reference line perpendicularly intersecting the first reference line and extending from a first border of the scapula to an opposite second border of the scapula, and (iii) measuring the length of the second reference line.   
     
     
         26 . The method of  claim 25  wherein:
 the predetermined percentage is 100% or less. 
 
     
     
         27 . The method of  claim 25  wherein:
 the predetermined percentage is 90%-99%. 
 
     
     
         28 . The method of  claim 25  wherein:
 the predetermined percentage is 80%-99%. 
 
     
     
         29 . The method of  claim 25  wherein:
 the second reference line intersects the first reference line at about 10 to 18 millimeters above the inferior border of the glenoid image. 
 
     
     
         30 . The method of  claim 25  wherein:
 the second reference line intersects the first reference line at about 14 millimeters above the inferior border of the glenoid image. 
 
     
     
         31 . The method of  claim 25  wherein:
 the image is a computed tomography scan slice.

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