Method and device for joint replacement

Patent metadata

Field	Value
Publication number	US-2017296201-A1
Application number	US-201715637798-A
Country	US
Kind code	A1
Filing date	Jun 29, 2017
Priority date	Jul 26, 2012
Publication date	Oct 19, 2017
Grant date	—

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 outer surface are unreamed.

First claim

1 .- 4 . (canceled)

5 . 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 of the femoral head outer surface and the acetabulum outer surface are unaltered.

6 . The method of claim 5 , wherein both the femoral head outer surface and acetabulum outer surface are unreamed and uncut, and wherein inserting the hemiarthroplasty cup includes engaging the cup inner surface with the femoral head outer surface and the cup outer surface with the acetabulum outer surface.

7 . The method of claim 5 , further comprising securing the hemiarthroplasty cup to the acetabulum outer surface or the femoral head outer surface after inserting the hemiarthroplasty cup through the one of the one or more portals.

8 .- 16 . (canceled)

17 . The method of claim 5 , wherein after inserting the hemiarthroplasty cup, the hemiarthroplasty cup can freely articulate against both the femoral head outer surface and the acetabulum outer surface.

18 . The method of claim 5 , wherein:
the cup inner surface is shaped and sized to accommodate an unreamed femoral head outer surface of the femoral head of the femur; the cup outer surface is shaped and sized to accommodate an unreamed acetabulum outer surface of the acetabulum socket of the pelvis; and the hemiarthroplasty cup is configured to maintain allowance of articulation of the femoral head outer surface and the acetabulum socket relative to the hemiarthroplasty cup after implantation.

19 . The method of claim 5 , wherein the hemiarthroplasty cup is at least partially hemispherical-shaped.

20 . The method of claim 19 , wherein the hemiarthroplasty cup is a hemisphere.

21 . The method of claim 5 , wherein the hemiarthroplasty cup is a monolithic body.

22 . The method of claim 5 , wherein the hemiarthroplasty cup is made of a solid material.

23 . The method of claim 5 , wherein the hemiarthroplasty cup comprises polyethylene, cobalt chrome, steel or aluminum.

24 . The method of claim 5 , further comprising installing the hemiarthroplasty cup between the femoral head outer surface of the femoral head and the acetabulum outer surface of the acetabulum socket without assisting fixation after inserting the hemiarthroplasty cup through the one of the one or more portals.

25 . The method of claim 5 , wherein the one or more portals adjacent the hip joint are formed without cutting completely through a ligamentous hip capsule or musculature of the hip joint.

26 . The method of claim 5 , further comprising removing traction from the hip joint after inserting the hemiarthroplasty cup through the one of the one or more portals.

27 . The method of claim 5 , wherein the one of the one or more portals comprises one of an anterolateral portal, a midanterior portal and a distal anterolateral portal.

28 . 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; inserting a hemiarthroplasty cup through one of the one or more portals without cutting completely through a ligamentous hip capsule or musculature of the hip joint; and positioning the hemiarthroplasty cup 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 outer surface are unaltered.

29 . The method of claim 28 , wherein both the femoral head and the acetabulum are unaltered.

30 . The method of claim 28 , wherein positioning the hemiarthroplasty cup between the femoral head outer surface and the acetabulum outer surface allows the hemiarthroplasty cup to freely articulate against both the femoral head outer surface and the acetabulum outer surface.

31 . 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; inserting a hemiarthroplasty cup through one of the one or more portals; and positioning the hemiarthroplasty cup between a femoral head outer surface of the femoral head and an acetabulum outer surface of the acetabulum socket without assisting fixation; wherein at least one of the femoral head outer surface and the acetabulum outer surface are unaltered.

32 . The method of claim 31 , wherein both the femoral head and the acetabulum are unaltered.

33 . The method of claim 31 , wherein positioning the hemiarthroplasty cup between the femoral head outer surface and the acetabulum outer surface allows the hemiarthroplasty cup to freely articulate against both the femoral head outer surface and the acetabulum outer surface.

Assignees

• Zimmer Inc

Inventors

• Birmingham Patrick M

Classifications

• A61F2/3603

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

• A61F2/32

  for the hip · CPC title

• A61F2002/30754

  Implants for interposition between two natural articular surfaces · CPC title

• 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

• A61B17/1666 Primary

  for the acetabulum · CPC title