Apparatuses and methods for arthroplastic surgery

Abstract

A distal cut guide assembly including an intramedullary rod, an alignment guide extending from the rod at an angle and having a slot, a cut guide body having a rail defining a rail axis, a coupling member slidably coupled to rail, and a handle slidably and pivotally joining coupling member to slot and defining a handle axis. The position of the guide body being adjustable relative to the bone along rail axis and slot and about handle axis. A tibial cut guide assembly including a cut guide support member and a cut guide pivotally attached to the support member. An arthroplastic spacer including a spacer block having an axis of symmetry. The spacer includes a handle having a linear portion aligned with and longitudinally bisected by the axis of symmetry and a curved portion coupling linear portion to block. The curved portion is spaced from the axis of symmetry.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The above mentioned and other features and objects of this invention, and the manner of attaining them, will become more apparent and the invention itself will be better understood by reference to the following description of an embodiment of the invention taken in conjunction with the accompanying drawings, wherein:

FIG. 1 is a side view of a cut guide body and coupling member of a distal cut guide assembly according to one embodiment of the present invention;

FIG. 2 is a top perspective view of the cut guide body and coupling member of FIG. 1;

FIG. 3 is a top view of the cut guide body and coupling member of FIG. 1;

FIG. 4 is a perspective view of the coupling member of FIG. 1;

FIG. 5 is a perspective view of a distal cut guide assembly according to one embodiment of the present invention;

FIG. 6 is an exploded view of the distal cut guide assembly of FIG. 5;

FIG. 7 is another perspective view of the distal cut guide assembly of FIG. 5;

FIG. 8 is an anterior view of a femur with the cut guide assembly of FIG. 5 mounted thereon;

FIG. 9 is a medial view of the femur of FIG. 8;

FIG. 10 is a sectional view of the distal cut guide assembly of FIG. 7 taken along lines 10-10;

FIG. 11 is a perspective view of a cut guide body according to another embodiment of the present invention;

FIG. 12 is a bottom view of the cut guide body of FIG. 11;

FIG. 13 is another perspective view of the cut guide body of FIG. 11;

FIG. 14 is a perspective view of a tibial cut guide assembly according to one embodiment of the present invention;

FIG. 15 is a front view of the tibial cut guide assembly of FIG. 14;

FIG. 15A is a sectional view of the tibial cut guide assembly of FIG. 15 taken along lines 15A-15A;

FIG. 16 is a top view of the tibial cut guide assembly of FIG. 14;

FIG. 17 is an exploded view of the tibial cut guide assembly of FIG. 14;

FIG. 18 is a bottom perspective view of the tibial cut guide of the cut guide assembly of FIG. 14;

FIG. 19 is an exploded view of a tibial cut guide assembly according to another embodiment of the present invention;

FIG. 20 is a perspective view of an arthroplastic spacer in accordance with one embodiment of the present invention;

FIG. 21 is a bottom (inferior) view of the arthroplastic spacer of FIG. 20;

FIG. 22 is a side (lateral) view of the arthroplastic spacer of FIG. 20;

FIG. 23 is a top (superior) view of the arthroplastic spacer of FIG. 20 being inserted into the knee joint atop the proximal end of a tibia;

FIG. 24 is a top (superior) view of the arthroplastic spacer of FIG. 20 in position atop the proximal end of the tibia;

FIG. 25 is a side (lateral) view of the knee joint with the arthroplastic spacer of FIG. 20 in position in the joint space;

FIG. 26 is a front (anterior) view of a tibial cut guide assembly according to another embodiment of the present invention positioned against a tibia bone;

FIG. 27 is a perspective view of the cut guide support member of the assembly of FIG. 26;

FIG. 28 is a bottom (inferior) view of the support member of FIG. 27;

FIG. 29 is a side (lateral) view of the support member of FIG. 27;

FIG. 30 is a side (lateral) view of the cut guide of the assembly of FIG. 26;

FIG. 31 is a back (posterior) view of the cut guide of FIG. 30;

FIG. 32 is a front (anterior) view of an assembly of the support member and cut guide of FIGS. 27 and 30;

FIG. 32A is a sectional view of the assembly of FIG. 32 taken along line 32A-32A;

FIG. 33 is a perspective view of the assembly of FIG. 32;

FIG. 34 is an exploded view of the assembly of FIG. 26;

FIG. 35 is a perspective view of the vertical fixation pin of the assembly of FIG. 34; and

FIG. 36 is a perspective view of the assembly of FIG. 26.

Claims

1. A tibial cut guide assembly for cutting a proximal end of the tibia bone, the tibia bone defining a tibial axis and including the proximal end and an anterior surface, the cut guide assembly comprising: a cut guide support member having a first end and a second end, said first end having an upper surface and a lower surface, said support member having an opening extending through said first end from said upper surface to said lower surface, said opening defining a first axis, said support member having a hole extending into said first end and intersecting said opening;a cut guide having a first bone engaging surface, an opposing second surface, and opposing proximal and distal sides extending between said first and second surfaces, said cut guide having at least one cut guide surface extending from said first surface to said second surface, said cut guide having a mounting post extending vertically from said distal side, said mounting post having a sidewall extending about said first axis and a notch defined in and extending about a portion of said sidewall, said mounting post rotatably received within said opening of said support member such that said notch is aligned with said hole; anda pin extending through said hole, said pin having a first end extending into said notch to prevent vertical movement of said mounting post along said first axis, said first end of said pin pivotal within said notch to permit and limit rotation of said mounting post about said first axis.

2. The tibial cut guide assembly of claim 1 wherein said notch includes a flat surface extending along a plane parallel to said first axis.

3. The tibial cut guide assembly of claim 1 where in said first end of said pin is beveled.

4. The tibial cut guide assembly of claim 1 wherein said bone engaging first surface is contoured for placement against the anterior surface of the tibia bone.

5. The tibial cut guide assembly of claim 1 wherein said cut guide surface includes an elongated slot extending through said cut guide from said first surface to said second surface.

6. The tibial cut guide assembly of claim 1 wherein said first end of said cut guide support member includes a first bone facing side and an opposite second side, said first and second sides extending between said upper and lower surfaces, said notch is disposed in said sidewall of said post proximal said first bone engaging surface, and said hole extending into said first bone facing side of said first end.

7. The tibial cut guide assembly of claim 1 wherein said first end of said cut guide support member includes a first bone facing side and an opposite second side, said first and second sides extending between said upper and lower surfaces, said notch is disposed in said sidewall of said post proximal said second surface, and said hole extending into said second side of said first end.

8. The tibial cut guide assembly of claim 1 wherein said cut guide assembly further includes: an elongate riser stem defining a stem axis and having a primary end and an opposing secondary end, said primary end coupled to said second end of said cut guide support member;an elongate alignment rod member defining an alignment axis and adapted to be mounted to the tibia with said alignment axis being parallel to the tibial axis; anda stem height adjustment member coupled to both said secondary end of said riser stem and said alignment rod member, said stem height adjustment member operable to translate riser stem along said stem axis.

9. The tibial cut guide assembly of claim 1 wherein said cut guide has a medial end and an opposing lateral end, said medial and lateral ends extend between said opposing first and second surfaces and said opposing proximal and distal sides, said medial end defines a first width extending between said opposing first and second surfaces, said lateral end defines a second width extending between said opposing first and second surfaces, said first width is less than said second width.

10. A tibial cut guide assembly for cutting a proximal end of the tibia bone, the tibia bone including the proximal end and an anterior surface, the cut guide assembly comprising: a cut guide support member having a first end and a second end, said first end having an opening extending therethrough and defining a first axis, said support member having a hole extending into said first end at an angle to said first axis and intersecting said opening;a cut guide having a first bone engaging surface, an opposing second surface, and opposing proximal and distal sides extending between said first and second surfaces, said cut guide having at least one cut guide surface extending from said first surface to said second surface, said cut guide having a mounting post extending from said distal side, said mounting post having a vertical sidewall and a flat notch defined in said sidewall, said mounting post rotatably received within said opening of said support member such that said notch is aligned with said hole; anda pin extending through said hole, said pin having a first end extending into said notch to prevent movement of said mounting post within said opening along said first axis, said first end of said pin pivotal within said notch to permit and limit rotation of said mounting post about said first axis.

11. The tibial cut guide assembly of claim 10 where in said first end of said pin is beveled.

12. The tibial cut guide assembly of claim 10 wherein said bone engaging first surface is contoured for placement against the anterior surface of the tibia bone.

13. The tibial cut guide assembly of claim 10 wherein said cut guide has a medial end and an opposing lateral end, said medial and lateral ends extend between said opposing first and second surfaces and said opposing proximal and distal sides, said medial end defines a first width extending between said opposing first and second surfaces, said lateral end defines a second width extending between said opposing first and second surfaces, said first width is less than said second width.

14. The tibial cut guide assembly of claim 10 wherein said first end of said cut guide support member has an upper surface, a lower surface, a first bone facing side and an opposite second side, said first and second sides extending between said upper and lower surfaces, said opening extending through said first end from said upper surface to said lower surface, said notch is disposed in said sidewall of said post proximal said first bone engaging surface, and said hole extending into said first bone facing side of said first end.

15. The tibial cut guide assembly of claim 10 wherein said first end of said cut guide support member has an upper surface, a lower surface, a first bone facing side and an opposite second side, said first and second sides extending between said upper and lower surfaces, said opening extending through said first end from said upper surface to said lower surface, said notch is disposed in said sidewall of said post proximal said second surface, and said hole extending into said second side of said first end.

16. The tibial cut guide assembly of claim 10 wherein said cut guide assembly further includes: an elongate riser stem defining a stem axis and having a primary end and an opposing secondary end, said primary end coupled to said second end of said cut guide support member;an elongate alignment rod member defining an alignment axis and adapted to be mounted to the tibia with said alignment axis being parallel to the tibial axis; anda stem height adjustment member coupling said riser stem to said alignment rod member, said stem height adjustment member operable to translate riser stem along said stem axis.

17. The tibial cut guide assembly of claim 16 wherein said stem axis is at an angle relative to said first axis.

18. A tibial cut guide assembly for cutting a proximal end of the tibia bone, the tibia bone including the proximal end and an anterior surface, the cut guide assembly comprising: a cut guide support member having a first end and a second end, said first end having an opening extending therethrough and defining a first axis, said support member having a hole extending into said first end at an angle to said first axis and intersecting said opening;a cut guide having a first bone engaging surface, an opposing second surface, and opposing proximal and distal sides extending between said first and second surfaces, said cut guide having at least one cut guide surface extending from said first surface to said second surface, said cut guide having a mounting post extending from said distal side, said mounting post having a sidewall extending about said first axis and a notch defined in said sidewall and extending about a portion of said sidewall, said mounting post rotatably received within said opening of said support member such that said notch is aligned with said hole; anda pin extending through said hole, said pin having a first end extending into said notch to prevent movement of said mounting post within said opening along said first axis, said first end of said pin movable within said notch to permit and limit rotation of said mounting post about said first axis.

19. The tibial cut guide assembly of claim 18 wherein said notch includes a flat surface extending along a plane parallel to said first axis.

20. The tibial cut guide assembly of claim 18 where in said first end of said pin is beveled.