System and method for distal radioulnar joint resurfacing with dynamic fixation
A joint resurfacing system for repairing defects in the articular surface of the distal radioulnar joint. The system includes a hemiarthroplasty implant device for the ulna resulting in minimal removal of the underlying bone. The implant device includes a curved body, an interior surface and an opposed exterior surface, where the interior surface is coupled to an articular surface of an ulna bone. The system also includes a fixation device having a threaded end with the threaded end coupled to the implant device in order to apply a compressive force on the implant device. the fixation device may be selected from either a dynamic fixation device or a static screw device.
1 . An assembly for joint resurfacing, comprising:
an implant device, wherein said implant device further comprising a curved body, an interior surface and an opposed exterior surface, wherein said interior surface is coupled to an articular surface of a ulna bone; and
a fixation device having a threaded end, wherein said fixation device is coupled to said implant device at said threaded end thereby applying a compressive force on said implant device.
2 . The assembly of claim 1 , wherein said fixation device is a dynamic compression device.
3 . The assembly of claim 1 , wherein said fixation device is a static screw.
4 . The assembly of claim 1 , wherein said exterior surface is coupled to a radial bone surface.
5 . The assembly of claim 1 , wherein said curved body further comprises a plurality of edges to mimic a surface of said ulna bone.
6 . The assembly of claim 1 , further comprising a plurality of spikes on said interior surface of said implant device.
7 . The assembly of claim 6 , wherein each of said plurality of spikes has a tapered edge.
8 . The assembly of claim 1 , wherein said interior surface is concave.
9 . The assembly of claim 1 , wherein said implant device further comprises a plurality of slots disposed in said curved body.
10 . The assembly of claim 9 , wherein said plurality of slots receive an implant tool for coupling said implant device to said ulna bone.
11 . The assembly of claim 10 , wherein said interior surface has a threaded aperture for receiving said threaded end of said fixation device.
12 . The assembly of claim 11 , wherein said threaded aperture partially traverses said curved body orthogonally to said interior surface.
13 . The assembly of claim 7 , wherein said plurality of spikes are tapered for traveling through bone material.
14 . A system for joint resurfacing, comprising:
an implant device for attaching to a ulna bone, wherein said implant device having a curved body, an interior surface and an opposed exterior surface;
a fixation device having a threaded end for applying a compressive force on said implant device, wherein said fixation device is coupled to said implant device at said threaded end; and
an implant holder assembly, wherein said implant holder assembly further comprising:
an elongated member having a slot at a third end, a first protrusion at a fourth end, and a longitudinal aperture traversing a length of said elongated member;
an elongated rod coupled to said longitudinal aperture for grasping said implant device;
a modular arm having a rail at a fifth end and a third aperture at a sixth end, wherein said rail is slideably coupled to said slot; and
a guide barrel coupled to said third aperture.
15 . The system of claim 14 , wherein said fixation device is a dynamic compression device.
16 . The system of claim 15 , wherein said fixation device is a static screw.
17 . The system of claim 14 , wherein said exterior surface is coupled to a radial bone surface.
18 . The system of claim 14 , wherein said curved body further comprises a plurality of edges to mimic an articulating surface of said ulna bone.
19 . The system of claim 14 , further comprising a plurality of spikes on said interior surface of said implant device.
20 . The system of claim 19 , wherein each of said plurality of spikes has a tapered edge.
21 . The system of claim 14 , wherein said interior surface is concave.
22 . The system of claim 14 , wherein said implant device further comprises a plurality of slots disposed in said curved body.
23 . The system of claim 22 , wherein said plurality of slots receive said implant holder for coupling said implant device to said ulna bone.
24 . The system of claim 23 , wherein said interior surface has a threaded aperture for receiving said threaded end of said fixation device.
25 . The system of claim 24 , wherein said threaded aperture partially traverses said curved body orthogonally to said interior surface.
26 . The system of claim 20 , wherein said plurality of spikes are tapered for traveling through bone material.
27 . The system of claim 22 , wherein said elongated rod further comprises a cylindrical knob at a seventh end and an opposed second protrusion at an eighth end, wherein turning said knob causes said second protrusion to move relative to said first protrusion.
28 . The system of claim 27 , wherein said first and second protrusions are frictionally coupled to said plurality of slots.
29 . A method for joint resurfacing, comprising:
making an incision and exposing a distal radioulnar joint;
distracting the radioulnar joint;
inserting a trial inserter device and selecting an implant device;
coupling an implant holder assembly to the implant device;
attaching implant holder assembly to the ulna bone and rotating a guide barrel to frictionally couple the implant device onto the ulna bone;
predrilling a hole in the ulna bone;
inserting a fixation device in the ulna bone and threadably coupling the fixation device to the implant device; and
removing the implant holder assembly.
30 . The method of claim 29 , further comprising utilizing the trial inserter device to achieve a proper depth and alignment of the implant device.
31 . The method of claim 30 , further comprising slideably coupling a modular arm to the implant holder assembly.
32 . The method of claim 29 , wherein the implant device comprises a curved body, an interior surface and an opposed exterior surface.
33 . The method of claim 32 , wherein the fixation device comprises a threaded end for applying a compressive force on the implant device, wherein the fixation device is coupled to the implant device at the threaded end.
34 . The method of claim 33 , wherein the fixation device is a dynamic compression device.
35 . The method of claim 33 , wherein the fixation device is a static screw.
36 . The method of claim 33 , wherein the implant holder assembly comprises:
an elongated member having a slot at a first end, a first protrusion at a second end, and a longitudinal first aperture traversing a length of the elongated member;
an elongated rod coupled to the first aperture for grasping the implant device;
a modular arm having a rail at a third end and a second aperture at a fourth end, wherein the rail is slideably coupled to the slot; and
a guide barrel coupled to said third aperture.
37 . The method of claim 32 , wherein the exterior surface is coupled to a radial bone surface.
38 . The method of claim 37 , wherein the curved body includes a plurality of edges to mimic an articulating surface of the ulna bone.
39 . The method of claim 38 , wherein the curved body includes a plurality of spikes on the interior surface.
40 . The method of claim 39 , wherein each of the plurality of spikes has a tapered edge.
41 . The method of claim 40 , wherein the interior surface is concave.
42 . The method of claim 41 , wherein the implant device further comprises a plurality of elongated slots disposed in the curved body.
43 . The method of claim 42 , wherein the plurality of elongated slots receive the implant holder assembly for coupling the implant device to the ulna bone.
44 . The method of claim 43 , wherein the interior surface has a threaded aperture for receiving the threaded end of the fixation device.
45 . The method of claim 44 , wherein the threaded aperture partially traverses the curved body orthogonally to the interior surface.
46 . The method of claim 40 , wherein the plurality of spikes are tapered for traveling through bone material.
47 . The method of claim 46 , wherein the elongated rod includes a cylindrical knob at a fifth end and an opposed second protrusion at an sixth end, wherein turning the knob causes the second protrusion to move relative to the first protrusion.
48 . The method of claim 47 , wherein the first and second protrusions are frictionally coupled to the plurality of elongated slots.