Arthroplasty Jigs with Mating Accuracy

Patent metadata

Field	Value
Publication number	US-2016354092-A1
Application number	US-201615242312-A
Country	US
Kind code	A1
Filing date	Aug 19, 2016
Priority date	Jul 23, 2008
Publication date	Dec 8, 2016
Grant date	—

Abstract

Disclosed herein is a method of defining a mating surface in a first side of an arthroplasty jig. The mating surface is configured to matingly receive and contact a corresponding patient surface including at least one of a bone surface and a cartilage surface. The first side is oriented towards the patient surface when the mating surface matingly receives and contacts the patient surface. The method may include: a) identifying a contour line associated with the patient surface as represented in a medical image; b) evaluating via an algorithm the adequacy of the contour line for defining a portion of the mating surface associated with the contour line; c) modifying the contour line if the contour line is deemed inadequate; and d) employing the modified contour line to define the portion of the mating surface associated with the contour line.

First claim

What is claimed is:

1 . A tibial arthroplasty jig for assisting in the performance of a tibial arthroplasty procedure on an arthroplasty target region of a tibia of a patient knee joint, the tibia including a tibial shaft, a tibial plateau edge, a tibial tuberosity, and the arthroplasty target region, wherein the tibial shaft near the patient knee joint includes a shaft surface on an anterior side of the tibial shaft, the shaft surface being distal of the tibial plateau edge and generally proximal of the tibial tuberosity, the arthroplasty target region including a tibial plateau including a medial articular plateau surface and a lateral articular plateau surface, the tibial arthroplasty jig comprising:
a first mating surface configured to matingly contact the shaft surface when the tibial arthroplasty jig is applied to the tibia to perform the tibial arthroplasty procedure on the arthroplasty target region, wherein the first mating surface comprises a surface negative of the shaft surface and the first mating surface exists in the tibial arthroplasty jig at least as early as the tibial arthroplasty jig being completely manufactured.

2 . The tibial arthroplasty jig of claim 1 , wherein the shaft surface includes a portion that extends distally from generally the tibial plateau edge to a point generally even with a beginning of a distal half to a distal third of the tibial tuberosity.

3 . The tibial arthroplasty jig of claim 2 , wherein the portion extends medial-lateral from a medial edge of the medial tibia condyle to a point generally even with a medial edge of the tibial tuberosity.

4 . The tibial arthroplasty jig of claim 3 , wherein the portion generally tapers in a distal direction.

5 . The tibial arthroplasty jig of claim 1 , wherein the shaft surface includes a portion that extends distally from generally the tibial plateau edge to a point near a proximal boundary of the tibial tuberosity.

6 . The tibial arthroplasty jig of claim 5 , wherein the portion extends medial-lateral generally between a lateral edge and a medial edge of the tibial tuberosity.

7 . The tibial arthroplasty jig of claim 6 , wherein the portion is generally rectangular, having a long length extending medial-lateral.

8 . The tibial arthroplasty jig of claim 1 , wherein the shaft surface includes a portion that extends distally from generally the tibial plateau edge to a point generally even with a beginning of a distal two-thirds to a distal three-quarters of the tibial tuberosity.

9 . The tibial arthroplasty jig of claim 8 , where the portion extends medial-lateral from generally a lateral edge of the tibial tuberosity to generally a lateral edge of the lateral tibia condyle.

10 . The tibial arthroplasty jig of claim 9 , wherein the portion generally tapers in a distal direction.

11 . The tibial arthroplasty jig of claim 1 , further comprising second and third mating surfaces respectively configured to matingly contact the medial articular plateau surface and the lateral articular plateau surface when the tibial arthroplasty jig is applied to the tibia to perform the tibial arthroplasty procedure on the arthroplasty target region,
wherein the second and third mating surfaces respectively comprise a surface negative of the medial articular plateau surface and a surface negative of the lateral articular plateau surface, the second and third mating surfaces existing in the tibial arthroplasty jig at least as early as the tibial arthroplasty jig being completely manufactured.

12 . The tibial arthroplasty jig of claim 11 , wherein mating contact between the tibial arthroplasty jig is limited to the mating contact of the first, second and third mating surfaces with the shaft surface, the medial articular plateau surface and the lateral articular plateau surface, respectively.

13 . The tibial arthroplasty jig of claim 11 , wherein the first, second and third mating surfaces are part of a unitary construction of the tibial arthroplasty jig.

14 . The tibial arthroplasty jig of claim 11 , wherein the first, second and third mating surfaces are each non-adjustable relative to tibial arthroplasty jig.

15 . The tibial arthroplasty jig of claim 1 , further comprising a cutting guide surface positioned and oriented relative to the first mating surface to result in a cut in the arthroplasty target region with a desired position and orientation.

16 . The tibial arthroplasty jig of claim 11 , wherein the desired position and orientation allows a prosthetic tibial implant to restore the patient knee joint to a natural alignment.

Assignees

• Howmedica Osteonics Corp

Inventors

• Park Ilwhan

Classifications

• A61B17/15 Primary

  Guides therefor · CPC title

• A61B17/1764

  for the knee · CPC title

• A61B34/10 Primary

  Computer-aided planning, simulation or modelling of surgical operations · CPC title

• A61B2034/108

  Computer aided selection or customisation of medical implants or cutting guides · CPC title

• A61B17/1675

  for the knee · CPC title