Shoulder prosthesis and components thereof

Patent metadata

Field	Value
Publication number	US-9763797-B2
Application number	US-201314439605-A
Country	US
Kind code	B2
Filing date	Dec 19, 2013
Priority date	Dec 27, 2012
Publication date	Sep 19, 2017
Grant date	Sep 19, 2017

Abstract

The present disclosure relates to a shoulder prosthesis comprising a glenoidal component having a glenoidal articulation surface and a humeral component having a humeral articulation surface, and a separate mobile glenohumeral bearing component comprising a glenoidal bearing surface and a humeral bearing surface arranged on opposite sides of the glenohumeral bearing component. The glenoidal bearing surface contacts in an implanted state the glenoidal articulation surface and/or the humeral bearing surface contacts in an implanted state the humeral articulation surface. At least one of the glenoidal and humeral bearing surfaces is concave. The glenohumeral bearing component is disposed in an implanted state between the glenoidal component and the humeral component. Both the glenoidal and humeral articulation surfaces are convex.

First claim

The invention claimed is:

1. A shoulder prosthesis comprising:
a glenoidal component having a glenoidal articulation surface;
a humeral component having a humeral articulation surface; and
a separate mobile glenohumeral bearing component comprising an exterior glenoidal bearing surface and an exterior humeral bearing surface arranged on opposite sides of the glenohumeral bearing component, wherein the glenohumeral bearing component is disposed, in an implanted state, between the glenoidal component and the humeral component such that at least one of the glenoidal bearing surface and the humeral bearing surface contacts the corresponding glenoidal articulation surface or humeral articulation surface;
wherein at least one of the glenoidal and humeral bearing surfaces is concave;
wherein both the glenoidal and humeral articulation surfaces are convex; and
wherein when the glenohumeral bearing component is in an implanted state, the glenohumeral bearing component is mobile relative to at least one of the glenoidal component and the humeral component.

2. The shoulder prosthesis according to claim 1 , wherein the glenoidal and humeral bearing surfaces have different curvatures or comprise different sizes.

3. The shoulder prosthesis according to claim 1 , wherein the glenohumeral bearing component comprises at least one of a central recess in the glenoidal bearing surface and a central opening extending from the glenoidal bearing surface to the humeral bearing surface.

4. The shoulder prosthesis according to claim 1 , wherein the glenoidal component comprises a glenoidal bone interface provided to be attached to a scapula of a patient and/or wherein the humeral component comprises a humeral bone interface provided to be attached to a humerus of a patient, wherein the glenoidal interface or the humeral bone interface is concave.

5. The shoulder prosthesis according to claim 4 , wherein the glenoidal bone interface is disposed on a glenoidal base element that couples with an articulation element of the glenoidal component carrying the glenoidal articulation surface via a first coupling means and/or wherein the humeral bone interface is disposed on a humeral base element that couples with an articulation element of the prosthetic humeral component carrying the humeral articulation surface via a second coupling means.

6. The shoulder prosthesis according to claim 1 , wherein the glenohumeral bearing component is made of ceramic, polyethylene, or a combination thereof.

7. The shoulder prosthesis according to claim 1 , wherein the glenoidal articulation surface, the humeral articulation surface, the glenoidal bearing surface and the humeral bearing surface are designed such that a first coefficient of friction between the glenoidal articulation surface and the glenoidal bearing surface and a second coefficient of friction between the humeral articulation surface and the humeral bearing surface are essentially equivalent.

8. The shoulder prosthesis according to claim 1 , wherein one of the glenoidal bearing and the humeral bearing surfaces is concave and the other of the glenoidal bearing and the humeral bearing surfaces is one of planar, convex or concave.

9. A method for implanting a shoulder prosthesis comprising the steps of:
providing or obtaining a prosthetic glenoidal component comprising a glenoidal articulation surface, wherein the glenoidal articulation surface is convex;
resecting a glenoidal portion of a patient's scapula and attaching the glenoidal component to the resected glenoidal portion;
providing or obtaining a prosthetic humeral component comprising a humeral articulation surface, wherein the humeral articulation surface is convex;
resecting a proximal end portion of a patient's humerus and attaching the humeral component to the resected proximal end portion; and
inserting a mobile glenohumeral bearing component comprising an exterior glenoidal bearing surface and an exterior humeral bearing surface, wherein at least one of the glenoidal bearing surface and the humeral bearing surface contacts, in an implanted state, the corresponding glenoidal articulation surface or humeral articulation surface;
wherein when the glenohumeral bearing component is in the implanted state, the glenohumeral bearing component is mobile relative to at least one of the glenoidal component and the humeral component.

10. The method according to claim 9 , wherein the step of resecting the glenoidal portion of a patient's scapula comprises preparing a convex bone portion adapted to match a correspondingly shaped bone interface of the glenoidal component.

11. The method according to claim 10 , wherein the step of attaching the glenoidal component to the resected glenoidal portion comprises placing the glenoidal component on the convex bone portion and fixing it to the scapula using at least one of a screw, bone cement and a press-fit means.

12. The method according to claim 11 , wherein the glenoidal bone interface is concave.

13. The method according to claim 9 , wherein at least one of the glenoidal and humeral bearing surfaces is concave.

14. A shoulder prosthesis comprising:
a glenoidal component having a glenoidal articulation surface;
a humeral component having a humeral articulation surface; and
a separate mobile glenohumeral bearing component comprising a glenoidal bearing surface and a humeral bearing surface arranged on opposite sides of the glenohumeral bearing component, wherein the glenohumeral bearing component is disposed, in an implanted state, between the glenoidal component and the humeral component such that the glenoidal and humeral bearing surfaces contact the corresponding glenoidal and humeral articulation surfaces, without securing, fixing, or otherwise attaching the glenohumeral bearing component to the glenoidal component and the humeral component;
wherein at least one of the glenoidal and humeral bearing surfaces is concave;
wherein both the glenoidal and humeral articulation surfaces are convex; and
wherein when the glenohumeral bearing component is in an implanted state, the glenohumeral bearing component is mobile relative to the glenoidal component and the humeral component, due to the absence of physical attachment between the glenohumeral bearing component and the glenoidal and humeral components, thereby enabling the glenohumeral bearing component to move freely and articulate relative to the glenoidal articulation surface and the humeral articulation surface.

15. The shoulder prosthesis according to claim 1 , wherein the glenohumeral bearing component is peanut shaped.

16. The shoulder prosthesis according to claim 1 , wherein the glenohumeral bearing component is lens shaped.

Assignees

• Zimmer Gmbh

Inventors

• Hopkins Andrew
• Hardy Philippe

Classifications

• A61F2/40 Primary

  for shoulders · CPC title

• A61F2/4014

  Humeral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic humeral shafts · CPC title

• A61F2002/302

  toroidal, e.g. rings · CPC title

• A61F2/4081

  Glenoid components, e.g. cups · CPC title

• A61F2002/4018

  Heads or epiphyseal parts of humerus · CPC title