METHOD FOR SELECTING MODULAR IMPLANT COMPONENTS

• US 20080021299A1
• Filed: 07/18/2006
• Published: 01/24/2008
• Est. Priority Date: 07/18/2006
• Status: Abandoned Application

• Current Assignee: Zimmer Incorporated (Zimmer Biomet Holdings, Inc.)
• Original Assignee: Zimmer Incorporated (Zimmer Biomet Holdings, Inc.)
• Inventors: Meulink, Steven L.
• Application Number:
  US11/458,257
• Publication Number:
  US 20080021299A1
• Time in Patent Office: Days
• US Class Current: 600/407
• CPC Class Codes: A61B 2050/3008 having multiple compartments
• CPC Class Codes: A61B 5/107 Measuring physical dimensions, e.g. size of the entire body or parts thereof
• CPC Class Codes: A61B 5/4528 Joints A61B5/4533, A61B5/4538 take precedence
• CPC Class Codes: A61B 50/30 Containers specially adapted for packaging, protecting, dispensing, collecting or disposing of surgical or diagnostic appliances or instruments for wound clamps A61B17/10; for ligaturing clips A61B17/122; packages or dispensers for surgical gloves or finger-stalls A61B42/40
• CPC Class Codes: A61B 50/33 Trays
• CPC Class Codes: A61F 2/0095 Packages or dispensers for prostheses or other implants for intraocular lenses A61F2/1691; for dental surgery A61C19/02
• CPC Class Codes: A61F 2/3609 Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic femoral shafts A61F2/3601 takes precedence
• CPC Class Codes: A61F 2/38 for elbows or knees
• CPC Class Codes: A61F 2/40 for shoulders
• CPC Class Codes: A61F 2/46 Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
• CPC Class Codes: A61F 2002/30332 Conically- or frustoconically-shaped protrusion and recess
• CPC Class Codes: A61F 2002/30604 modular
• CPC Class Codes: A61F 2002/30616 Sets comprising a plurality of prosthetic parts of different sizes or orientations
• CPC Class Codes: A61F 2002/30708 Means for distinguishing between left-sided and right-sided devices, Sets comprising both left-sided and right-sided prosthetic parts
• CPC Class Codes: A61F 2002/3071 Identification means; Administration of patients
• CPC Class Codes: A61F 2002/30948 using computerized tomography, i.e. CT scans
• CPC Class Codes: A61F 2002/30963 using templates, e.g. grid charts
• CPC Class Codes: A61F 2002/3611 Heads or epiphyseal parts of femur
• CPC Class Codes: A61F 2002/3625 Necks
• CPC Class Codes: A61F 2002/365 Connections of heads to necks
• CPC Class Codes: A61F 2002/3652 : Connections of necks to shafts
• CPC Class Codes: A61F 2002/4633 : for selection of endoprosthetic joints or for pre-operative planning
• CPC Class Codes: A61F 2220/0033 : made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit
• CPC Class Codes: A61F 2250/0084 : Means for distinguishing between left-sided and right-sided devices; Sets comprising both left-sided and right-sided prosthetic parts
• CPC Class Codes: A61F 2250/0089 : coded with symbols, e.g. dots, numbers, letters, words

Abstract

A method for selecting modular neck components for hip implants based on independent variables associated with physical characteristics of the implant, including leg length, offset, and anteversion. During surgery, the surgeon may be confronted with a need to change a preoperatively-chosen modular neck. For example, the surgeon may desire a change in at least one of the variables, e.g., leg length, offset, and/or anteversion. The present method allows the surgeon to quickly and easily select a different modular neck based on an evaluation of one of the variables without requiring reevaluation of the other variables. The method may include preoperative planning in which a template including a grid coordinate system is used.

Claims

1. A method for selecting an orthopedic implant from a system of orthopedic implants for implantation in an anatomical structure of a patient, the method comprising the steps of:

acquiring an image of the anatomical structure;

using a template with a grid coordinate system to assess at least one of a first, second, and third variable associated with respective physical characteristics of the implants, the grid coordinate system having a plurality of reference points corresponding to at least two of the first, second, and third variables; and

selecting a first orthopedic implant from the system of implants based on coordinates determined using the template.

2. The method of claim 1, wherein the implants are modular components of a hip implant system and the first variable corresponds to leg length, the second variable corresponds to offset, and the third variable corresponds to anteversion.

3. The method of claim 1, wherein said using step is completed preoperatively.

4. The method of claim 1, wherein one of the variables is arranged along a first axis of the grid coordinate system and another of the variables is arranged along a second axis of the grid coordinate system orthogonal to the first axis.

5. The method of claim 1, wherein the system of implants comprises an arrangement of implants including at least one subset in which at least one of the first, second, and third variables associated with a respective different physical characteristic of the implants is constant and the others of the first, second, and third variables vary within each subset.

6. The method of claim 5, wherein the arrangement comprises at least one container including a plurality of implants arranged according to each subset.

7. The method of claim 6, wherein the arrangement includes one container per subset.

8. The method of claim 6, wherein the arrangement includes one container with multiple subsets.

9. The method of claim 5, wherein the arrangement comprises a graphical representation arranged according to the at least one subset.

10. A method for intraoperatively selecting an orthopedic implant for implantation in an anatomical structure of a patient, the method comprising the steps of:

assessing, intraoperatively, at least one of a first, a second, and a third variable associated with respective physical characteristics of the implant; and

selecting an orthopedic implant based on a change in the at least one variable from a system in which the implants are arranged in subsets in which one of the others of the first, second, and third variables is constant.

11. The method of claim 10, wherein the implant is a modular component of a hip implant system and the first variable corresponds to leg length, the second variable corresponds to offset, and the third variable corresponds to anteversion.

12. The method of claim 10, wherein the system of implants comprises an arrangement of implants including at least one subset in which at least one of the first, second, and third variables associated with a respective different physical characteristic of the implants is constant and the others of the first, second, and third variables vary within each subset.

13. The method of claim 12, wherein the arrangement comprises at least one container including a plurality of implants arranged according to each subset.

14. The method of claim 13, wherein the arrangement includes one container per subset.

15. The method of claim 13, wherein the arrangement includes one container with multiple subsets.

16. The method of claim 12, wherein the arrangement comprises a graphical representation arranged according to the at least one subset.