Shoulder arthroplasty system

Patent metadata

Field	Value
Publication number	US-9283075-B2
Application number	US-201213616154-A
Country	US
Kind code	B2
Filing date	Sep 14, 2012
Priority date	Jan 20, 2006
Publication date	Mar 15, 2016
Grant date	Mar 15, 2016

Abstract

An implant system for total shoulder arthroplasties, hemi shoulder arthroplasties, and “reverse” total shoulder arthroplasties including a humeral stem having an enlarged head portion with interfaces adapted to removably receive various modular interchangeable components, such as articulating liners, spacers, and adapter inserts. The humeral stem functions as a universal platform that may be used in either conventional or “reverse” total shoulder arthroplasties, as well as hemi shoulder arthroplasties, and may remain implanted in place during a revision in which the implant system is converted between the foregoing configurations, for example.

First claim

What is claimed is:

1. A humeral implant component for use in a reverse total shoulder arthroplasty, comprising:
a stem that includes a stem portion extending toward a distal end of the stem and a head portion at a proximal end of the stem, said head portion including a head portion cavity with a first diameter portion and an annular rib element that projects into the head portion cavity from said first diameter portion to create a second diameter portion in the head portion cavity, said second diameter portion having a smaller diameter than said first diameter portion; and
an articulating liner, the articulating liner including a first end that is receivable in said head portion cavity for axially securing said articulating liner to said head portion, said articulating liner being substantially wedge-shaped with an annular upper surface opposite an annular lower surface and with a concave articulating surface extending from said annular upper surface for articulating against a convex surface of a glenoid component, said annular upper surface and said annular lower surface defining an angle therebetween, said annular upper surface being angled between about 55 degrees and about 70 degrees with respect to a longitudinal axis of said stem, said annular lower surface being angled between about 35 degrees and about 55 degrees with respect to said longitudinal axis of said stem, wherein the first end of the articulating liner includes an annular engagement structure configured to extend into the first diameter portion of the head portion cavity behind said annular rib element so as to engage said annular rib element for axially securing the articulating liner to the head portion
wherein the head portion cavity includes a tapered bore providing a third diameter portion with a diameter that is smaller than said second diameter portion, and wherein the first end of the articulating liner further includes a post projecting beyond said annular engagement structure for receipt in said tapered bore for axially securing said articulating liner to said head portion.

2. The humeral implant component of claim 1 , wherein said annular lower surface is angled between about 50 degrees and about 55 degrees with respect to said longitudinal axis.

3. The humeral implant component of claim 1 , wherein the head portion is a separate piece that is separable from the stem portion.

4. The humeral implant component of claim 1 , further comprising a metallic spacer connecting the articulating liner to the stem.

5. The humeral implant component of claim 1 , wherein said post is shaped to provide an interference fit within the tapered bore of the head portion cavity.

6. The humeral implant component of claim 1 , wherein said annular engagement structure comprises a plurality of spring fingers.

7. The humeral implant component of claim 1 , wherein the stem includes a hub section providing a suture hole in a proximal region of the stem.

8. A humeral implant component for use in a reverse total shoulder arthroplasty, comprising:
a stem that includes a stem portion extending toward a distal end of the stem, the stem portion defining a longitudinal axis, said stem further including a separable head piece that is joined to the stem portion so as to provide an enlarged head portion at a proximal end of the stem, said enlarged head portion including a proximal surface that is angled between about 35 degrees and about 55 degrees with respect to said longitudinal axis, said enlarged head portion including a head portion cavity in which an articulating liner can be received, said head portion cavity including a first annular engagement structure disposed in the head portion cavity;
an articulating liner receivable in said head portion cavity for securing the articulating liner to the enlarged head portion, said articulating liner including an upper surface from which a concave articulating surface extends for articulating against a convex surface of a glenoid component, said upper surface being angled between about 55 degrees and about 70 degrees with respect to said longitudinal axis, wherein the articulating liner includes a second annular engagement structure projecting from an annular lower surface, said second annular engagement structure configured to engage said first annular engagement structure in the head portion cavity of the enlarged head portion for axially securing the articulating liner to the enlarged head portion; and
a metallic spacer that includes a spacer cavity with a third annular engagement structure disposed in the spacer cavity,
wherein said articulating liner also is receivable in said spacer cavity, the second annular engagement structure of the articulating liner configured to engage the third annular engagement structure in the spacer cavity for axially securing the articulating liner to the metallic spacer, a first end of the articulating liner including a post that projects beyond the second annular engagement structure for receipt in a tapered bore in the spacer cavity for axially securing said articulating liner to said metallic spacer, whereby said articulating liner is selectively axially securable to said metallic spacer and said enlarged head portion so that said metallic spacer can be used to modularly secure said articulating liner to said enlarged head portion.

9. The humeral implant component of claim 8 , wherein said proximal surface is angled between about 50 degrees and about 55 degrees with respect to said longitudinal axis.

10. The humeral implant component of claim 8 , wherein the articulating liner includes an annular lower surface that is disposed substantially parallel to the proximal surface of said enlarged head portion.

11. The humeral implant component of claim 8 , wherein the third annular engagement structure comprises an annular rib element for cooperating with the second annular engagement structure of the articulating liner for axially securing said articulating liner to the metallic spacer.

12. The humeral implant component of claim 8 , wherein the second annular engagement structure of the articulating liner comprises a plurality of spring fingers.

13. A humeral implant component for use in a reverse total shoulder arthroplasty, comprising:
a stem that includes a stem portion extending toward a distal end of the stem, the stem portion defining a longitudinal axis, said stem further including a separable head piece that is joined to the stem portion so as to provide an enlarged head portion at a proximal end of the stem, said enlarged head portion including a proximal surface adapted to be disposed substantially parallel to a resection cut line of a humerus when said humeral implant component is implanted in the humerus;
an articulating liner disposed proximate the proximal end of the stem, said articulating liner including an annular lower surface adapted to be disposed substantially parallel to the proximal surface of said head portion when said humeral implant component is implanted within the humerus, said articulating liner also including an annular upper surface from which a concave articulating surface extends for articulating against a convex surface of a glenoid component, said upper surface being angled between about 55 degrees and about 70 degrees with respect to said longitudinal axis, the articulating liner including a first annular engagement structure that projects beyond said annular lower surface, the articulating liner further including a post that projects beyond said first annular engagement structure; and
a metallic spacer connecting the articulating liner to the head portion, said metallic spacer including a spacer cavity with a

Assignees

• Wiley Roy C
• Hodorek Brian C
• Zimmer Inc

Inventors

• Wiley Roy C
• Hodorek Brian C

Classifications

• A61F2002/4641

  for disconnecting · CPC title

• A61F2002/30772

  Apertures or holes, e.g. of circular cross section · CPC title

• A61F2/30734 Primary

  Modular inserts, sleeves or augments, e.g. placed on proximal part of stem for fixation purposes or wedges for bridging a bone defect · CPC title

• A61F2002/3092

  having an open-celled or open-pored structure · CPC title

• A61F2/4014

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