Total joint arthroplasty jig
Disclosed herein is an arthroplasty jig for use in an arthroplasty procedure on a bone of a patient that forms a ball and socket joint. The arthroplasty jig may include a customized mating region and a resection guide. The customized mating region and the resection guide are referenced to each other such that, when the customized mating region matingly engages a surface area of a proximal femur, the resection guide will be aligned to guide a resectioning of the proximal femur along a preoperatively planned resection plane.
1. An arthroplasty jig for use in performing an arthroplasty procedure on a bone of a patient, the bone forming a portion of a ball and socket joint, the bone comprising a head having an articular surface that is bounded by a neck border, a non-articular surface extending distally from the neck border, and a tubercle formed on non-articular surface of the bone, the arthroplasty jig comprising:
a jig body comprising:
a first mating surface defined on a bone facing side of the jig body, the first mating surface configured to matingly contact the non-articular surface of the bone in a first location in a customized fashion unique to the patient when the jig body is applied to the bone to perform the arthroplasty procedure;
a second mating surface defined on the bone facing side of the jig body, the second mating surface configured to matingly contact the non-articular surface of the bone in a second location in a customized fashion unique to the patient when the jig body is applied to the bone to perform the arthroplasty procedure;
a spaced-apart surface defined on the bone facing side of the jig body and separating the first mating surface and the second mating surface, the spaced-apart surface configured to be recessed from contact with the tubercle when the first and second mating surface matingly contact the first and second locations on the non-articular surface, respectively; and
a saw guide configured to guide a saw in making a resection of the bone, the saw guide extending through the jig body and comprising a preoperatively planned position and orientation relative to the first and second mating surfaces.
2. The arthroplasty jig of claim 1 , wherein the first mating surface, the second mating surface, and the spaced-apart surface are formed in the jig body prior to the jig being used in the arthroplasty procedure.
3. The arthroplasty jig of claim 1 , wherein the jig body further comprises a third mating surface defined on the bone facing side of the jig body, the third mating surface configured to matingly contact the non-articular surface of the bone in a third location in a customized fashion unique to the patient when the jig body is applied to the bone to perform the arthroplasty procedure, the third mating surface being separated from the first and second mating surfaces by a portion of the spaced-apart surface.
4. The arthroplasty jig of claim 3 , wherein the first mating surface and the third mating surface are separated by the saw guide.
5. The arthroplasty jig of claim 1 , wherein the spaced-apart surface is configured to overlay but refrain from contacting the tubercle when the first and second mating surface matingly contact the first and second locations on the non-articular surface, respectively.
6. The arthroplasty jig of claim 1 , wherein no surfaces of the jig body are configured to make mating contact with the articular surface of the head of the bone.
7. The arthroplasty jig of claim 1 , wherein the jig body further comprises an aperture configured to guide a tool into the bone, the aperture extending through the jig body and comprising a preoperatively planned position and orientation relative to the first and second mating surfaces.
8. The arthroplasty jig of claim 7 , wherein the aperture extends through the first mating surface.
9. The arthroplasty jig of claim 1 , wherein the saw guide intersects the spaced-apart surface on the jig facing side of the jig body.
10. The arthroplasty jig of claim 1 , wherein the saw guide comprises a planar slot.
11. The arthroplasty jig of claim 1 , wherein the bone is a femur.
12. The arthroplasty jig of claim 1 , wherein the joint is a shoulder.
13. The arthroplasty jig of claim 1 , wherein the joint is a hip.
14. The arthroplasty jig of claim 1 , wherein the jig body is a single piece structure.