Acetabular Cup Having An Adjustable Modular Augment

• US 20090204225A1
• Filed: 02/12/2008
• Published: 08/13/2009
• Est. Priority Date: 02/12/2008
• Status: Active Grant

• Current Assignee: Biomet Manufacturing, LLC (Zimmer Biomet Holdings, Inc.)
• Original Assignee: Biomet Manufacturing, LLC (Zimmer Biomet Holdings, Inc.)
• Inventors: Meridew, Jason D., Hershberger, Troy W.
• Granted Patent: US 7,993,408 B2
• Time in Patent Office: Days
• US Class Current: 623/22.210
• CPC Class Codes: A61F 2/30734 Modular inserts, sleeves or augments, e.g. placed on proximal part of stem for fixation purposes or wedges for bridging a bone defect
• CPC Class Codes: A61F 2/34 Acetabular cups
• CPC Class Codes: A61F 2/4081 Glenoid components, e.g. cups
• CPC Class Codes: A61F 2002/30433 using additional screws, bolts, dowels, rivets or washers e.g. connecting screws
• CPC Class Codes: A61F 2002/30495 using a locking ring
• CPC Class Codes: A61F 2002/305 Snap connection
• CPC Class Codes: A61F 2002/30507 using a threaded locking member, e.g. a locking screw or a set screw
• CPC Class Codes: A61F 2002/30616 Sets comprising a plurality of prosthetic parts of different sizes or orientations
• CPC Class Codes: A61F 2002/30736 Augments or augmentation pieces, e.g. wedges or blocks for bridging a bone defect
• CPC Class Codes: A61F 2002/3092 having an open-celled or open-pored structure
• CPC Class Codes: A61F 2002/3401 with radial apertures, e.g. radial bores for receiving fixation screws
• CPC Class Codes: A61F 2002/3406 Oblong apertures
• CPC Class Codes: A61F 2220/0025 Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
• CPC Class Codes: A61F 2220/0041 using additional screws, bolts, dowels or rivets, e.g. connecting screws

Abstract

An orthopedic prosthesis for implantation into a bone of a patient can include a shell, an augment and a securing member. The shell can be adapted to be affixed within the bone and have an outer surface adapted to receive bone ingrowth after implantation. The shell can have an inner surface adapted to engage a liner. An elongated slot can extend between the outer and inner surfaces of the shell. The augment can define a body and have a passage therethrough. The securing member can extend through the passage and the slot. The securing member can be movable between a locked position wherein the augment is precluded from relative movement with the shell and an unlocked position wherein the securing member is adapted to slidably traverse along the slot to locate the augment at a plurality of positions relative to the shell.

Claims

1. An orthopedic prosthesis for implantation into a bone of a patient, said orthopedic prosthesis comprising:

a shell adapted to be affixed within the bone, said shell having an outer surface, an inner surface, and an elongated slot extending between said outer and inner surfaces;

an augment defining a body and having a passage therethrough; and

a securing member extending through said passage and said slot, wherein said securing member is movable between a locked position wherein said augment is precluded from relative movement with said shell and an unlocked position wherein said securing member is adapted to move between a first position on the slot and a second position on the slot to locate said augment at said first and second positions, respectively.

2. The orthopedic prosthesis of claim 1 wherein a transition between said slot and said inner surface of said shell is defined by a channel.

3. The orthopedic prosthesis of claim 2 wherein said securing member defines a shell end and an augment end, wherein said shell end is nested in said inner surface in said locked position.

4. The orthopedic prosthesis of claim 3 wherein said shell end of said securing member is nested in said channel in said locked position.

5. The orthopedic prosthesis of claim 2 wherein said securing member defines a shell end and an augment end, wherein said augment end is nested into said body to a location inboard of an outer augment surface.

6. The orthopedic prosthesis of claim 2 wherein said securing member collectively defines a fastener and a nut.

7. The orthopedic prosthesis of claim 6 wherein said fastener defines a threaded shaft and a head, said threaded shaft threadably engaging a bore defined through said nut in said locked position.

8. The orthopedic prosthesis of claim 7 wherein said head nests in one of said shell and said augment in said locked position and said nut nests in the other of said shell and said augment in said locked position.

9. The orthopedic prosthesis of claim 8 wherein said nut defines a concave proximal profile that substantially conforms to said inner surface of said shell.

10. The orthopedic prosthesis of claim 7 wherein said head is adapted to nest on an annular ridge defined in said augment body in said locked position.

11. The orthopedic prosthesis of claim 1 wherein said augment defines a shell facing surface having a plurality of protrusions formed thereon, wherein said shell facing surface is offset from said outer surface of said shell in said locked position by said protrusions.

12. The orthopedic prosthesis of claim 1 wherein said shell comprises an acetabular shell.

13. The orthopedic prosthesis of claim 1 wherein said securing member is adapted to slidably traverse along said elongated slot to locate said augment at a plurality of positions relative to said shell.

14. The orthopedic prosthesis of claim 1 wherein said elongated slot extends along said shell in a direction generally transverse to an upper rim of said shell.

15. An orthopedic prosthesis for implantation into a bone of a patient, said orthopedic prosthesis comprising:

a shell adapted to be affixed within the bone, said shell having an outer surface, an inner surface and an elongated slot formed thereon;

an augment defining a body; and

a securing member extending between said slot and said augment, wherein said securing member is movable between a locked position wherein said augment is precluded from relative movement with said shell and an unlocked position wherein said securing member is adapted to locate at various locations along said slot to locate said augment at a plurality of positions relative to said shell.

16. The orthopedic prosthesis of claim 15 wherein a transition between said slot and said inner surface of said shell is defined by a channel and wherein said securing member defines a shell end and an augment end, wherein said shell end is nested in said inner surface in said locked position.

17. The orthopedic prosthesis of claim 16 wherein said shell end of said securing member is nested in said channel in said locked position.

18. The orthopedic prosthesis of claim 15 wherein said augment defines a shell facing surface having a plurality of protrusions formed thereon, wherein said shell facing surface is offset from said outer surface of said shell in said locked position by said protrusions.

19. The orthopedic prosthesis of claim 15 wherein said augment defines a shell facing surface having a central keel portion formed thereon, wherein said shell facing surface is offset from said outer surface of said shell in said locked position by said central keel portion.

20. The orthopedic prosthesis of claim 15 wherein said securing member is adapted to slidably traverse along said slot to locate said augment at a plurality of positions relative to said shell.

21. An orthopedic prosthesis for implantation into a bone of a patient, said orthopedic prosthesis comprising:

a shell adapted to be affixed within the bone, said shell having an outer surface, an inner surface, and a first engagement portion formed thereon;

an augment defining a body and a second engagement portion formed thereon; and

a securing member extending between said first and second engagement portions and selectively coupling said augment to said cup, wherein said securing member is movable between a locked position wherein said augment is precluded from relative movement with said shell and an unlocked position wherein said augment is adapted to slidably communicate along said outer surface of said shell to locate said augment at a plurality of positions relative to said shell.

22. The orthopedic prosthesis of claim 21 wherein one of said first and second engagement portions defines a slot and said securing member defines a fastener and nut, wherein said fastener is adapted to communicate along said slot to locate said augment at said plurality of positions relative to said shell.

23. The orthopedic prosthesis of claim 21 wherein a plurality of protrusions extend between a shell facing surface of said augment and said shell, wherein said shell facing surface is offset from said outer surface of said shell in said locked position by said protrusions.

24. The orthopedic prosthesis of claim 23 wherein said plurality of protrusions define a plurality of removable spacers that are selectively coupled to one of said augment and said shell.

25. The orthopedic prosthesis of claim 21 wherein said augment defines a shell facing surface that slidably and freely communicates along said outer surface of said shell while in said unlocked position.