Method and device for joint replacement

Patent metadata

Field	Value
Publication number	US-9737315-B2
Application number	US-201414559260-A
Country	US
Kind code	B2
Filing date	Dec 3, 2014
Priority date	Jul 26, 2012
Publication date	Aug 22, 2017
Grant date	Aug 22, 2017

Abstract

A method of joint replacement including forming one or more arthroscopy portals adjacent a hip joint that includes, a femur with a femoral head and a pelvis with an acetabulum socket, inserting a hemiarthroplasty cup, having a cup inner surface and a cup outer surface, between a femoral head outer surface of the femoral head and an acetabulum outer surface of the acetabulum socket, wherein at least one of the femoral head outer surface and the acetabulum other surface are unreamed.

First claim

I claim:

1. A method of joint replacement comprising:
forming one or more portals adjacent a hip joint that includes, a femur with a femoral head and a pelvis with an acetabulum socket; and
inserting a hemiarthroplasty cup through one of the one or more portals, the hemiarthroplasty cup having a cup inner surface and a cup outer surface, between a femoral head outer surface of the femoral head and an acetabulum outer surface of the acetabulum socket so that the hemiarthroplasty cup can freely articulate against both the femoral head outer surface and the acetabulum outer surface, wherein at least one of the femoral head outer surface and the acetabulum outer surface are unreamed;
wherein the hemiarthroplasty cup has a hemispherical shape.

2. The method of claim 1 , wherein both the femoral head outer surface and acetabulum outer surface are unreamed and uncut, and wherein the cup inner surface engages the femoral head outer surface and the cup outer surface engages the acetabulum outer surface.

3. The method of claim 1 , further including inserting a guide wire through a portion of the femur to extend out of the femoral head.

4. The method of claim 3 , further including securing a reamer blade to the guide wire.

5. The method of claim 4 , further including reaming the femoral head outer surface to at least one of access cancellous bone and remove damaged cartilage.

6. The method of claim 5 , further including unsecuring the reamer blade from the guide wire.

7. The method of claim 4 , further including reaming the acetabulum outer surface to at least one of access cancellous bone and remove damaged cartilage.

8. The method of claim 7 , further including unsecuring the reamer blade from the guide wire.

9. The method of claim 1 , wherein the hemiarthroplasty cup is installed between the femoral head outer surface of the femoral head and the acetabulum outer surface of the acetabulum socket without assisting fixation.

10. The method of claim 9 , further comprising inserting a cup femoral head prosthesis adjacent to the femoral head outer surface and the hemiarthroplasty cup, wherein the hemiarthroplasty cup is comprised of a polymer and the cup femoral head prosthesis is comprised of a metal alloy.

11. A method of joint replacement comprising:
forming one or more portals adjacent a hip joint that includes, a femur with a femoral head and a pelvis with an acetabulum socket; and
inserting a hemiarthroplasty cup through one of the one or more portals, the hemiarthroplasty cup having a cup inner surface and a cup outer surface, between a femoral head outer surface of the femoral head and an acetabulum outer surface of the acetabulum socket, wherein both the femoral head outer surface and the acetabulum outer surface are unaltered;
wherein the cup inner surface engages the femoral head outer surface and the cup outer surface engages the acetabulum outer surface so that the hemiarthroplasty cup can freely articulate against both the femoral head outer surface and the acetabulum outer surface.

12. The method of claim 11 , wherein the hemiarthroplasty cup is installed between the femoral head outer surface of the femoral head and the acetabulum outer surface of the acetabulum socket without assisting fixation.

13. The method of claim 12 , wherein the hemiarthroplasty cup is installed without cutting completely through a ligamentous hip capsule or musculature of the hip joint.

Assignees

• Zimmer Inc

Inventors

• Birmingham Patrick M

Classifications

• A61F2002/3208

  Bipolar or multipolar joints, e.g. having a femoral head articulating within an intermediate acetabular shell whilst said shell articulates within the natural acetabular socket or within an artificial outer shell · CPC title

• A61F2/32

  for the hip · CPC title

• A61F2/3603

  implanted without ablation of the whole natural femoral head (endoprosthetic cartilage A61F2/30756) · CPC title

• A61F2002/4635

  using minimally invasive surgery · CPC title

• A61B17/1664 Primary

  for the hip · CPC title