DISTAL FEMORAL KNEE PROSTHESES

• US 20080058947A1
• Filed: 07/19/2007
• Published: 03/06/2008
• Est. Priority Date: 12/15/2005
• Status: Abandoned Application

• Current Assignee: Zimmer Incorporated (Zimmer Biomet Holdings, Inc.)
• Original Assignee: Zimmer Incorporated (Zimmer Biomet Holdings, Inc.)
• Inventors: Bertin, Kim, Booth, Robert, Hofmann, Aaron, Earl, Brian, Habegger, Abraham, Dorr, Lawrence, Romagnoli, Sergio, Rosenberg, Aaron
• Application Number:
  US11/780,248
• Publication Number:
  US 20080058947A1
• Time in Patent Office: Days
• US Class Current: 623/20.35
• CPC Class Codes: A61F 2/3094 Designing or manufacturing processes
• CPC Class Codes: A61F 2/3859 Femoral components
• CPC Class Codes: A61F 2002/30616 Sets comprising a plurality of prosthetic parts of different sizes or orientations

Abstract

A set of distal femoral knee prostheses which are designed to be more narrow in medial/lateral dimensions with increasing anterior/posterior size than existing prostheses to more closely correspond to the physical anatomy of female patients. The prostheses are designed to have a substantially trapezoidal shape or profile when viewed distally which features a more pronounced narrowing of the medial/lateral dimensions beginning at the posterior end of the prostheses and progressing anteriorly to the anterior end of the prostheses. Additionally, the prostheses each include a reduced profile patellar sulcus and reduced profile anterior condyles to more closely conform to the anatomy of a resected femur, and also include sulcus tracking optimized to conform to female anatomy.

Claims

1. :

A set of distal femoral prostheses particularly adapted for female anatomy, each femoral prosthesis including a distal nonarticulating surface having an anterior end and a posterior end, comprising;

a plurality of prostheses each having an overall anterior/posterior dimension defined between points located most anteriorly and most posteriorly on each prosthesis and a medial/lateral dimension defined between points located most medially and most laterally at anterior/posterior locations defined by the anterior end of the distal nonarticulating surface on each prosthesis;

at least some of said prostheses having a said overall anterior/posterior dimension and a said medial/lateral dimension falling below a conceptual boundary defined by a line connecting a first point and a second point, said first point having an approximately 52.0 mm overall anterior/posterior dimension and an approximately 49.0 mm medial/lateral dimension, and said second point having an approximately 77.0 mm overall anterior/posterior dimension and an approximately 67.0 mm medial/lateral dimension;

wherein said line is defined by the following equation;

(medial/lateral dimension)=(0.72*overall anterior/posterior dimension)+11.56.

2. :

The set of distal femoral prostheses of claim 1, wherein substantially all of said prostheses have said overall anterior/posterior dimensions and said medial/lateral dimensions that fall below said conceptual boundary.

3. :

The set of distal femoral prostheses of claim 1, wherein said medial/lateral dimensions of said prostheses respectively increase at a first rate, said overall anterior/posterior dimensions respectively increase at a second rate, said first rate and said second rate defining a ratio substantially equal to or less than 0.76.

4. :

A set of distal femoral prostheses particularly adapted for female anatomy, each femoral prosthesis including a distal nonarticulating surface having an anterior end and a posterior end, comprising;

a plurality of prostheses each having an overall anterior/posterior dimension defined between points located most anteriorly and most posteriorly on each prosthesis and a medial/lateral dimension defined between points located most medially and most laterally at anterior/posterior locations substantially equidistant from the anterior end of the distal nonarticulating surface and the posterior end of the distal nonarticulating surface;

at least some of said prostheses having a said overall anterior/posterior dimension and a said medial/lateral dimension falling below a conceptual boundary defined by a line connecting a first point and a second point, said first point having an approximately 52.0 mm overall anterior/posterior dimension and an approximately 55.0 mm medial/lateral dimension, and said second point having an approximately 77.0 mm overall anterior/posterior dimension and an approximately 78.5 mm medial/lateral dimension;

wherein said line is defined by the following equation;

(medial/lateral dimension)=(0.94*overall anterior/posterior dimension)+6.12.

5. :

The set of distal femoral prostheses of claim 4, wherein substantially all of said prostheses have said overall anterior/posterior dimensions and said medial/lateral dimensions that fall below said conceptual boundary.

6. :

The set of distal femoral prostheses of claim 4, wherein said medial/lateral dimensions of said prostheses respectively increase at a first rate, said overall anterior/posterior dimensions respectively increase at a second rate, said first rate and said second rate defining a ratio substantially equal to or less than 0.75.

7. :

A set of distal femoral prostheses particularly adapted for female anatomy, each femoral prosthesis including a distal nonarticulating surface having an anterior end and a posterior end, comprising;

a plurality of standard aspect ratio prostheses each having an overall anterior/posterior dimension defined between points located most anteriorly and most posteriorly on each prosthesis and a medial/lateral dimension defined between points located most medially and most laterally at anterior/posterior locations substantially equidistant from the anterior end of the distal nonarticulating surface and the posterior end of the distal nonarticulating surface;

at least some of said prostheses having a said overall anterior/posterior dimension and a said medial/lateral dimension falling below a conceptual boundary defined by a line connecting a first point and a second point, said first point having an approximately 52.0 overall anterior/posterior dimension and an approximately 55.0 medial/lateral dimension, and said second point having an approximately 77.0 overall anterior/posterior dimension and an approximately 78.5 medial/lateral dimension;

wherein said line is defined by the following equation;

(medial/lateral dimension)=(0.94*overall anterior/posterior dimension)+6.12.

8. :

The set of distal femoral prostheses of claim 7, wherein substantially all of said overall anterior/posterior dimensions and said medial/lateral dimensions fall below said conceptual boundary.

9. :

The set of distal femoral prostheses of claim 7, wherein said medial/lateral dimensions of said prostheses respectively increase at a first rate, said overall anterior/posterior dimensions respectively increase at a second rate, said first rate and said second rate defining a ratio substantially equal to or less than 0.89.

10. :

A set of distal femoral prostheses particularly adapted for female anatomy, each femoral prosthesis including a distal nonarticulating surface having an anterior end and a posterior end, comprising;

a plurality of standard aspect ratio prostheses respectively having increasingly greater overall anterior/posterior dimensions defined between points located most anteriorly and most posteriorly on each prosthesis and respectively having increasingly greater medial/lateral dimensions defined between points located most medially and most laterally at an anterior/posterior location defined by the anterior end of the distal nonarticulating surface on each prosthesis;

at least some of said prostheses having a said overall anterior/posterior dimension and a said medial/lateral dimension falling below a conceptual boundary defined by a line connecting a first point and a second point, said first point having an approximately 52.0 overall anterior/posterior dimension and an approximately 50.0 medial/lateral dimension, and said second point having an approximately 77.0 overall anterior/posterior dimension and an approximately 70.5 medial/lateral dimension;

wherein said line is defined by the following equation;

(medial/lateral dimension)=(0.82*overall anterior/posterior dimension)+7.36.

11. :

The set of distal femoral prostheses of claim 10, wherein substantially all of said overall anterior/posterior dimensions and said medial/lateral dimensions fall below said conceptual boundary.

12. :

The set of distal femoral prostheses of claim 10, wherein said medial/lateral dimensions of said prostheses respectively increase at a first rate, said overall anterior/posterior dimensions respectively increase at a second rate, said first rate and said second rate defining a ratio substantially equal to or less than 0.78.

13. :

A set of distal femoral prostheses particularly adapted for female anatomy, each femoral prosthesis including a distal nonarticulating surface and an anterior nonarticulating surface, comprising;

a plurality of standard aspect ratio prostheses respectively having increasingly greater overall anterior/posterior dimensions defined between points located most anteriorly and most posteriorly on each prosthesis and respectively having increasingly greater medial/lateral dimensions defined between points located most medially and most laterally at an anterior/posterior location defined by a distal most point on the anterior nonarticulating surface on each prosthesis;

at least some of said prostheses having a said overall anterior/posterior dimension and a said medial/lateral dimension falling below a conceptual boundary defined by a line connecting a first point and a second point, said first point having an approximately 52.0 overall anterior/posterior dimension and an approximately 40.1 medial/lateral dimension, and said second point having an approximately 77.0 overall anterior/posterior dimension and an approximately 53.5 medial/lateral dimension;

wherein said line is defined by the following equation;

(medial/lateral dimension)=(0.54*overall anterior/posterior dimension)+12.23.

14. :

The set of distal femoral prostheses of claim 13, wherein substantially all of said overall anterior/posterior dimensions and said medial/lateral dimensions fall below said conceptual boundary.

15. :

The set of distal femoral prostheses of claim 13, wherein said medial/lateral dimensions of said prostheses respectively increase at a first rate, said overall anterior/posterior dimensions respectively increase at a second rate, said first rate and said second rate defining a ratio substantially equal to or less than 0.44.

16. :

A set of distal femoral prostheses particularly adapted for female anatomy, each femoral prosthesis including a distal nonarticulating surface and an anterior nonarticulating surface, comprising;

a plurality of prostheses respectively having increasingly greater overall anterior/posterior dimensions defined between points located most anteriorly and most posteriorly on each prosthesis and respectively having increasingly greater medial/lateral dimensions defined between points located most medially and most laterally at an anterior/posterior location defined by a distal most point on the anterior nonarticulating surface on each prosthesis;

at least some of said prostheses having a said overall anterior/posterior dimension and a said medial/lateral dimension falling below a conceptual boundary defined by a line connecting a first point and a second point, said first point having an approximately 52.0 overall anterior/posterior dimension and an approximately 40.3 medial/lateral dimension, and said second point having an approximately 77.0 overall anterior/posterior dimension and an approximately 51.8 medial/lateral dimension;

wherein said line is defined by the following equation;

(medial/lateral dimension)=(0.46*overall anterior/posterior dimension)+16.38.

17. :

The set of distal femoral prostheses of claim 16, wherein substantially all of said overall anterior/posterior dimensions and said medial/lateral dimensions fall below said conceptual boundary.

18. :

The set of distal femoral prostheses of claim 16, wherein said medial/lateral dimensions of said prostheses respectively increase at a first rate, said overall anterior/posterior dimensions respectively increase at a second rate, said first rate and said second rate defining a ratio substantially equal to or less than 0.44.

19. :

A set of distal femoral prostheses particularly adapted for female anatomy, each femoral prosthesis including a distal nonarticulating surface having an anterior end and a posterior end, comprising;

a plurality of standard aspect ratio prostheses respectively having increasingly greater overall anterior/posterior dimensions defined between points located most anteriorly and most posteriorly on each prosthesis and having increasingly greater medial/lateral dimensions defined between points located most medially and most laterally at an anterior/posterior location substantially equidistant from the anterior end of the distal nonarticulating surface and the posterior end of the distal nonarticulating surface on each prosthesis;

said medial/lateral dimensions of said prostheses respectively increasing at a first rate, said overall anterior/posterior dimensions respectively increasing at a second rate, said first rate and said second rate defining a ratio substantially equal to or less than 0.89.

20. :

The set of distal femoral prostheses of claim 19, wherein said ratio is between approximately 0.45 and 0.89.

21. :

The set of distal femoral prostheses of claim 19, wherein said ratio is between approximately 0.50 and 0.75.

22. :

The set of distal femoral prostheses of claim 19, wherein said ratio is between approximately 0.55 and 0.70.

23. :

The set of distal femoral prostheses of claim 19, wherein said ratio is substantially equal to approximately 0.60.

24. :

A set of distal femoral prostheses particularly adapted for female anatomy, each femoral prosthesis including a distal nonarticulating surface having an anterior end and a posterior end, comprising;

a plurality of prostheses respectively having increasingly greater overall anterior/posterior dimensions defined between points located most anteriorly and most posteriorly on each prosthesis and having increasingly greater medial/lateral dimensions defined between points located most medially and most laterally at an anterior/posterior location substantially equidistant from the anterior end of the distal nonarticulating surface and the posterior end of the distal nonarticulating surface on each prosthesis;

said medial/lateral dimensions of said prostheses respectively increasing at a first rate, said overall anterior/posterior dimensions respectively increasing at a second rate, said first rate and said second rate defining a ratio substantially equal to or less than 0.75.

25. :

The set of distal femoral prostheses of claim 24, wherein said ratio is between approximately 0.45 and 0.75.

26. :

The set of distal femoral prostheses of claim 24, wherein said ratio is between approximately 0.50 and 0.70.

27. :

The set of distal femoral prostheses of claim 24, wherein said ratio is between approximately 0.55 and 0.65.

28. :

The set of distal femoral prostheses of claim 24, wherein said ratio is substantially equal to approximately 0.60.

29. :

A set of distal femoral prostheses particularly adapted for female anatomy, comprising;

a plurality of standard aspect ratio prostheses respectively having increasingly greater overall anterior/posterior dimensions defined between points located most anteriorly and most posteriorly on each prosthesis and having increasingly greater medial/lateral dimensions defined between points located most medially and most laterally at an anterior/posterior location defined at a location proximate said most posteriorly located point on each prosthesis;

said medial/lateral dimensions of said prostheses respectively increasing at a first rate, said overall anterior/posterior dimensions respectively increasing at a second rate, said first rate and said second rate defining a ratio substantially equal to or less than 0.96.

30. :

The set of distal femoral prostheses of claim 29, wherein said ratio is between approximately 0.50 and 0.96.

31. :

The set of distal femoral prostheses of claim 29, wherein said ratio is substantially equal to approximately 0.80.

32. :

A set of distal femoral prostheses particularly adapted for female anatomy, comprising;

a plurality of prostheses respectively having increasingly greater overall anterior/posterior dimensions defined between points located most anteriorly and most posteriorly on each prosthesis and having increasingly greater medial/lateral dimensions defined between points located most medially and most laterally at an anterior/posterior location defined at a location proximate said most posteriorly located point on each prosthesis;

said medial/lateral dimensions of said prostheses respectively increasing at a first rate, said overall anterior/posterior dimensions respectively increasing at a second rate, said first rate and said second rate defining a ratio substantially equal to or less than 0.84.

33. :

The set of distal femoral prostheses of claim 32, wherein said ratio is between approximately 0.50 and 0.84.

34. :

The set of distal femoral prostheses of claim 32, wherein said ratio is substantially equal to approximately 0.80.

35. :

A set of distal femoral prostheses particularly adapted for female anatomy, each femoral prosthesis including a distal nonarticulating surface having an anterior end and a posterior end, comprising;

a plurality of standard aspect ratio prostheses respectively having increasingly greater overall anterior/posterior dimensions defined between points located most anteriorly and most posteriorly on each prosthesis and respectively having increasingly greater medial/lateral dimensions defined between points located most medially and most laterally at an anterior/posterior location defined by the anterior end of the distal nonarticulating surface on each prosthesis;

said medial/lateral dimensions of said prostheses respectively increasing at a first rate, said overall anterior/posterior dimensions respectively increasing at a second rate, said first rate and said second rate defining a ratio substantially equal to or less than 0.78.

36. :

The set of distal femoral prostheses of claim 35, wherein said ratio is between approximately 0.30 and 0.78.

37. :

The set of distal femoral prostheses of claim 35, wherein said ratio is substantially equal to approximately 0.46.

38. :

A set of distal femoral prostheses particularly adapted for female anatomy, each femoral prosthesis including a distal nonarticulating surface having an anterior end and a posterior end, comprising;

a plurality of prostheses respectively having increasingly greater overall anterior/posterior dimensions defined between points located most anteriorly and most posteriorly on each prosthesis and respectively having increasingly greater medial/lateral dimensions defined between points located most medially and most laterally at an anterior/posterior location defined by the anterior end of the distal nonarticulating surface on each prosthesis;

said medial/lateral dimensions of said prostheses respectively increasing at a first rate, said overall anterior/posterior dimensions respectively increasing at a second rate, said first rate and said second rate defining a ratio substantially equal to or less than 0.76.

39. :

The set of distal femoral prostheses of claim 38, wherein said ratio is between approximately 0.30 and 0.76.

40. :

The set of distal femoral prostheses of claim 38, wherein said ratio is substantially equal to approximately 0.46.

41. :

A set of distal femoral prostheses particularly adapted for female anatomy, each femoral prosthesis including a distal nonarticulating surface and an anterior nonarticulating surface, comprising;

a plurality of standard aspect ratio prostheses respectively having increasingly greater overall anterior/posterior dimensions defined between points located most anteriorly and most posteriorly on each prosthesis and respectively having increasingly greater medial/lateral dimensions defined between points located most medially and most laterally at an anterior/posterior location defined by a distal most point on the anterior nonarticulating surface on each prosthesis;

said medial/lateral dimensions of said prostheses respectively increasing at a first rate, said overall anterior/posterior dimensions respectively increasing at a second rate, said first rate and said second rate defining a ratio substantially equal to or less than 0.44.

42. :

The set of distal femoral prostheses of claim 41, wherein said ratio is between approximately 0.20 and 0.44.

43. :

The set of distal femoral prostheses of claim 41, wherein said ratio is substantially equal to approximately 0.30.