KNEE JOINT PROSTHESIS SYSTEM AND METHOD FOR IMPLANTATION

• US 20090125114A1
• Filed: 10/09/2008
• Published: 05/14/2009
• Est. Priority Date: 10/10/2007
• Status: Active Grant

• Current Assignee: Biomet Manufacturing, LLC (Zimmer Biomet Holdings, Inc.)
• Original Assignee: Biomet Manufacturing, LLC (Zimmer Biomet Holdings, Inc.)
• Inventors: May, Brian M., Fox, Duke A.
• Granted Patent: US 8,187,280 B2
• Time in Patent Office: Days
• US Class Current: 623/20.140
• CPC Class Codes: A61B 17/155 Cutting femur
• CPC Class Codes: A61B 17/157 Cutting tibia
• CPC Class Codes: A61B 17/1764 for the knee
• CPC Class Codes: A61F 2/30721 Accessories
• CPC Class Codes: A61F 2/38 for elbows or knees
• CPC Class Codes: A61F 2/385 also provided with condylar bearing surfaces
• CPC Class Codes: A61F 2/3868 with sliding tibial bearing
• CPC Class Codes: A61F 2/3886 for stabilising knees against anterior or lateral dislocations
• CPC Class Codes: A61F 2002/30332 Conically- or frustoconically-shaped protrusion and recess
• CPC Class Codes: A61F 2002/30339 Double cones, i.e. connecting element having two conical connections, one at each of its opposite ends
• 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 2002/30736 Augments or augmentation pieces, e.g. wedges or blocks for bridging a bone defect
• CPC Class Codes: A61F 2002/30878 with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts
• CPC Class Codes: A61F 2220/0033 made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit

Abstract

A system for cooperating with an elongated IM member during preparation of a bone for receiving a prosthesis can include a scaffold, skeleton or frame. An alignment assembly can be selectively coupled to the frame. The alignment assembly can cooperate with the IM member to position the frame relative to the bone. A cutting block can be selectively coupled to the frame. According to other features, a posterior stabilized (PS) box guide assembly can have a PS box guide attachment portion that selectively couples with the first attachment portion of the frame. A posterior foot can selectively couple with a second attachment portion on the frame. The posterior foot can be positioned to occupy space of a joint line in an installed position.

Claims

1. A system for cooperating with an elongated intramedullary (IM) member during preparation of a bone for receiving a prosthesis, the system comprising:

a frame;

an alignment assembly selectively coupled to the frame, the alignment assembly cooperating with the IM member to position the frame relative to the bone; and

a cutting block selectively coupled to the frame.

2. The system of claim 1, further comprising a posterior stabilized (PS) box guide assembly having a PS box guide attachment portion that selectively couples with the first attachment portion of the frame.

3. The system of claim 1, further comprising a posterior foot that selectively couples with a second attachment portion on the frame, the posterior foot positioned to occupy space of a joint line in an installed position.

4. The system of claim 1, wherein the alignment assembly further comprises an alignment member having a receiving portion and a bushing selectively received by the receiving portion of the alignment member, the bushing defining a longitudinal axis and a bore configured to accept the IM member therethrough.

5. The system of claim 4, further comprising an engaging portion formed on the alignment member, wherein the bushing is selectively received by the receiving portion of the alignment member and the engaging portion is movable from a disengaged position to an engaged position, wherein in the engaged position, the engaging portion substantially inhibits movement of the bushing along the longitudinal axis while permitting rotation of the bushing around the longitudinal axis.

6. The system of claim 5 wherein the bushing defines an annular groove and wherein the engaging portion nests in the annular groove of the bushing in the engaged position.

7. The system of claim 6 wherein the engaging portion comprises a knob coupled to a shaft, wherein the knob is movable between the disengaged and engaged positions causing the shaft to move from a position generally into the receiving portion of the alignment member to a position generally within the body of the alignment member.

8. The system of claim 7 wherein the knob rotates about an axis between the disengaged and engaged positions.

9. The system of claim 5, further comprising a plurality of bushings each having a longitudinal axis and a bore formed through the bushing wherein the respective bores of each of the bushings are defined at distinct positions relative to the corresponding longitudinal axes.

10. A system for cooperating with an intramedullary (IM) member during preparation of at least a first bone for receiving a prosthesis, the system comprising:

a frame having an attachment portion formed thereon;

an alignment member having a body that defines a receiving portion and an alignment member attachment portion, wherein the alignment member attachment portion selectively couples with the attachment portion of the frame in an installed position;

a bushing selectively received by the receiving portion of the alignment member, the bushing defining a bore configured to accept the IM member therethrough;

a block having a plurality of tool guides formed thereon configured to guide a blade of a bone saw, the block having a block attachment portion that selectively couples with the attachment portion of the frame in an installed position; and

a posterior stabilized (PS) box guide assembly having a PS box guide attachment portion that selectively couples with the attachment portion of the frame in an installed position;

wherein each of the alignment member, the block and the PS box guide are selectively and alternatively coupled to the attachment portion of the frame during preparation of the bone.

11. The system of claim 10, further comprising an engaging portion formed on the alignment member, wherein the bushing is selectively received by the receiving portion of the alignment member and the engaging portion is movable from a disengaged position to an engaged position, wherein in the engaged position, the engaging portion substantially inhibits movement of the bushing along the longitudinal axis while permitting rotation of the bushing around the longitudinal axis.

12. The system of claim 10 wherein the bushing defines facets that selectively cooperate with structure on the alignment member to inhibit rotation around the longitudinal axis.

13. The system of claim 11 wherein the bushing defines an annular groove and wherein the engaging portion nests in the annular groove of the bushing in the engaged position.

14. The system of claim 13 wherein the engaging portion comprises a knob coupled to a shaft, wherein the knob is movable between the disengaged and engaged positions causing the shaft to move from a position generally within the body of the alignment member to a position generally into the receiving portion of the alignment member.

15. The system of claim 14 wherein the knob rotates about an axis between the disengaged and engaged positions.

16. The system of claim 10 wherein the attachment portion defines one of a rail or a slot and the alignment member attachment portion, the block attachment portion and the PS box guide attachment portion all define the other of the rail or slot, wherein the slot slidably accepts the rail in the installed position.

17. The system of claim 16 wherein the alignment member attachment portion defines a rail having a first portion that extends along the body in a first direction and a second portion that extends along the body in a second direction, the second direction being distinct from the first direction.

18. The system of claim 17 wherein the attachment portion defines a slot having a sliding portion and a locking portion.

19. The system of claim 18 wherein the second portion is movable between an assembly position and an installed position, wherein in the assembly position, the second portion is substantially flush with the body, and in the installed position, the second portion extends a distance outward from the body and securably nests in the locking portion of the slot, wherein in the installed position, slidable movement of the first portion of the rail along the sliding portion of the slot is substantially inhibited.

20. The system of claim 19 wherein the alignment member further comprises a biasing member that biases the second portion toward the installed position.

21. The system of claim 10 wherein the alignment member includes a stop that generally extends into the receiving portion wherein axial movement of the bushing is limited by the stop.

22. The system of claim 10, further comprising a posterior foot that selectively couples to a distal resection surface of the frame in an installed position, the posterior foot positioned to occupy space of a joint line in the installed position.

23. A system for cooperating with an intramedullary (IM) member during preparation of a bone for receiving a prosthesis, the system comprising:

a frame having a plurality of attachment portions formed thereon;

an alignment member having a body that defines a receiving portion, an engaging portion and an alignment member attachment portion, the alignment member attachment portion selectively coupling with a first attachment portion of the plurality of attachment portions of the frame in an installed position;

a bushing extending along a longitudinal axis and having a circumferential surface defining an annular groove formed thereon, and a bore formed through the bushing, the bore configured to accept the IM member therethrough; and

wherein the bushing is selectively received by the receiving portion of the alignment member and the engaging portion is movable from a disengaged position to an engaged position, wherein in the engaged position, the engaging portion nests in the annular groove of the bushing thereby substantially inhibiting movement of the bushing along the longitudinal axis while permitting rotation of the bushing around the longitudinal axis.

24. The system of claim 23 wherein the first attachment portion defines one of a rail or a slot and the alignment member attachment portion defines the other of the rail or slot, wherein the slot slidably accepts the rail in the installed position.

25. The system of claim 24 wherein the alignment member attachment portion defines a rail having a first portion that extends along the body in a first direction and a second portion that extends along the body in a second direction, the second direction being distinct from the first direction.

26. The system of claim 25 wherein the first attachment portion defines a slot having a sliding portion and a locking portion.

27. The system of claim 26 wherein the second portion is movable between an assembly position and an installed position, wherein in the assembly position, the second portion is substantially flush with the body, and in the installed position, the second portion extends a distance outward from the body and securably nests in the locking portion of the slot, wherein in the installed position, slidable movement of the first portion of the rail along the sliding portion of the slot is substantially inhibited.

28. The system of claim 26 wherein the alignment member further comprises a biasing member that biases the second portion toward the installed position.

29. The system of claim 23 wherein the engaging portion comprises a knob coupled to a foot, wherein the knob is movable between the disengaged and engaged positions causing the foot to move from a position generally within the body of the alignment member to a position generally into the receiving portion of the alignment member.

30. The system of claim 29 wherein the knob rotates about an axis between the disengaged and engaged positions.

31. The system of claim 30 wherein the alignment member includes a stop that generally extends into the receiving portion wherein axial movement of the bushing is limited by the stop.

32. The system of claim 23, further comprising a block having a plurality of tool guides formed thereon configured to guide a blade of a bone saw, the block having a block attachment portion that selectively couples with the first attachment portion of the plurality of attachment portions of the frame in an installed position.

33. The system of claim 32 wherein the block attachment portion includes a rail having a first portion that extends along the body in a first direction and a second portion that extends along the body in a second direction, the second direction being distinct from the first direction.

34. The system of claim 33 wherein the second portion is movable between an assembly position and an installed position, wherein in the assembly position, the second portion is substantially flush with the body and in the installed position, the second portion extends a distance outward from the body.

35. The system of claim 34 wherein the block further comprises a biasing member that biases the second portion toward the installed position.

36. The system of claim 32, further comprising a posterior stabilized (PS) box guide assembly having a PS box guide attachment portion that selectively couples with the first attachment portion of the plurality of attachment portions of the frame in an installed position.