Hip replacement process

• US 20110224798A1
• Filed: 03/09/2010
• Published: 09/15/2011
• Est. Priority Date: 03/09/2010
• Status: Active Grant

• Current Assignee: Farid Bruce Khalili, James Thompson Caillouette
• Original Assignee: Farid Bruce Khalili, James Thompson Caillouette
• Inventors: Caillouette, James Thompson, Khalili, Farid Bruce
• Granted Patent: US 8,425,618 B2
• Time in Patent Office: Days
• US Class Current: 623/22.11
• CPC Class Codes: A61F 2/36 Femoral heads ; Femoral endoprostheses
• CPC Class Codes: A61F 2002/30112 Rounded shapes, e.g. with rounded corners
• CPC Class Codes: A61F 2002/30156 triangular
• CPC Class Codes: A61F 2002/30334 Cone of elliptical or oval basis
• CPC Class Codes: A61F 2002/30367 with additional means for preventing said rotation
• CPC Class Codes: A61F 2002/30616 Sets comprising a plurality of prosthetic parts of different sizes or orientations
• CPC Class Codes: A61F 2002/30881 Circumferential ribs, flanges or fins
• CPC Class Codes: A61F 2002/3652 Connections of necks to shafts

Abstract

In a human hip replacement process, the steps include providing a selected size generally longitudinally extending stem and laterally angled neck, the stem received endwise into a recess in an elongated femur, there being a ball on the neck, the neck and stem having a non-circular tongue and groove interfit connection to resist relative rotary displacement therebetween, the connection defining a generally longitudinal axis, fitting the ball in a socket on a hip bone, to pivot in the socket, the selection of stem and neck, and tongue and groove connection between the size selected stem and neck, enabling accurate pivoting of the ball. A set of different size balls and neck units are enabled for selective choice, as during surgery.

Claims

1. In a human hip replacement process, the steps that include:

a) providing a selected size generally longitudinally extending stem and laterally angled neck, the stem received endwise into a recess in an elongated femur, the neck adapted to support a ball,

b) a size selected base carrying the neck, the base and stem having a non-circular tongue and groove interfit connection to resist relative rotary displacement therebetween, said connection defining a generally longitudinal axis,

c) fitting a selected ball on the open end of said neck,

d) there being an acetabular cup and insert socket being placed into acetabulum,

e) fitting a said ball in the socket on a hip bone, to pivot in the socket, said selection of stem and neck, and tongue and groove connection between the size selected base and stem, enabling accurate pivoting of the ball in the socket.

2. The method of claim 1 wherein said connection is provided to locate said non-circular interfit extending about said longitudinal axis.

3. The method of claim 1 wherein said non-circular interfit is defined by at least one oval cross section of said tongue and groove, at the interfit.

4. The method of claim 1 wherein said interfit is defined by multiple oval cross sections of the tongue and groove, at the interfit.

5. The method of claim 1 wherein said interfit is defined by multiple lobes of the tongue and groove, at the interfit.

6. The method of claim 1 including assembling said tongue and groove connection in conjunction with said stem fully inserted endwise into said recess in the femur.

7. The method of claim 4 wherein said non-circular interfit extends about said axis.

8. The method of claim 1 including relatively positioning said tongue and groove interfit to support said ball at selected angularity relative to said axis.

9. The method of claim 8 including assembling the ball into the socket after relative positioning of the interfit is completed.

10. The method of claim 1 including providing a set of neck units, of selectively and progressively different shape configurations, and ball units that can fit or are fitted onto said neck units, and said providing step includes selecting one of said neck and ball units corresponding to most accurate fitting of the ball with the socket.

11. The method of claim 10 wherein said most accurate fitting includes relative longitudinal and rotative displacement of the ball relative to the socket.

12. The method of claim 1 wherein the base and neck have integral interconnection.

13. The method of claim 1 wherein the neck extends upwardly and angularly relative to an upper surface of the base, and the base has a lower surface receivable by the stem, the upper and lower surfaces having selected spacing therebetween.

14. The method of claim 13 wherein the neck is angled relative to the base such that the neck can provide largest possible range of angular motion before it impinges on the edge of the socket in all directions.

15. The method of claim 13 including a set of said bases characterized by said spacings which are selectively different.

16. The method of claim 13 wherein the base has front and rear side surfaces with selected spacing therebetween, the neck extending frontally and upwardly and above said surfaces, said spacing selected for best fit of the ball into the socket.

17. The method of claim 16 wherein the base has rectangular block configuration.

18. The method of claim 17 wherein the stem forms a pocket receiving the base between pocket flanges, the pocket being forwardly open to receive different and selected length bases.

19. The method of claim 16 including a set of said bases characterized by said front to rear spacings being selectively different.

20. The method of claim 15 wherein the base has front and rear side surfaces with selected spacing therebetween, the neck extending frontally and upwardly and above said front surface, said spacing selected for best fit of the ball into the socket.

21. The method of claim 18 wherein said set is also characterized by said front to rear spacings being selectively different.

29. The method of claim 1 wherein the neck is provided to have one of the following:

i) an antiverted angularly extending position relative to the base,

ii) a retroverted angularly extending position relative to the base,

iii) a neutral extending position relative to the base.

22. In combination with a stem to be received endwise in a hip femur, an acetabular cup and insert socket being placed into acetabulum, a ball to be received in said acetabular insert, said neck being connectible with the ball,

a) a base in the form of a block connected with the neck,

b) and a pocket in an upper end of the stem, and characterized as sized to receive the base,

c) the pocket having opposite internally facing sides to closely receive opposite outwardly facing sides of the base therebetween, and having an open top for downward reception of the base,

d) the pocket having an open front for selective reception of each of a set of different length bases to openly extend forwardly, beneath the level of said neck.

23. The combination of claim 22 including said set of different length bases.

24. The combination of claim 22 wherein the pocket has a near end wall facing internally to engage and position a rear end wall of the base.

25. The combination of claim 23 including a tongue and groove connection of the base to the stem upper end, proximate said pocket rear end wall.

26. The combination of claim 25 wherein the neck is angled relative to the base such that the neck can provide the largest possible range of angular motion before it impinges on the edge of the socket in all directions of such motion.

27. The combination of claim 22 wherein said stem has two spaced apart flanges defining said pocket opposite internally facing sides.

28. The combination of claim 27 wherein said flanges have upper surfaces which are tapered in a forward direction, lengthwise of the pocket and base.

30. The combination of claim 22 wherein the neck has one of the following:

i) an antiverted angularly extending position relative to the base,

ii) a retroverted angularly extending position relative to the base,

iii) a neutral extending position relative to the base.