Shoulder arthroplasty system

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.

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 second annular engagement structure and a tapered bore disposed in the spacer cavity,
• wherein the articulating liner is received in the spacer cavity with the first annular engagement structure of the articulating liner engaging the second annular engagement structure of the spacer cavity and with the post of the articulating liner received in the tapered bore of the spacer cavity for axially securing said articulating liner to said metallic spacer.

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 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 head portion cavity;
• an articulating liner receivable in said head portion cavity for axially securing said articulating liner to said enlarged head portion, said articulating liner having an annular upper surface from which a concave articulating surface extends for articulating against a convex surface of a glenoid component;
• and
• a metallic spacer including a spacer cavity,
• wherein said head portion cavity incorporates an annular engagement structure dimensionally replicating an annular engagement structure disposed in said spacer cavity,
• wherein said spacer includes a post receivable in a bore of said head portion cavity for axially securing said metallic spacer to said stem,
• wherein said articulating liner also is receivable in said spacer cavity for axially securing said articulating liner to said metallic spacer, the articulating liner including a post capable of being interchangeably received in (i) the bore of said head portion cavity for axially securing said articulating liner to said stem and (ii) a bore of said 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 head portion so that said spacer can be used to modularly secure said articulating liner to said head portion.

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;
• a spacer secured to said head portion and including a spacer cavity incorporating a first annular engagement structure and a tapered bore that is spaced distally from said first annular engagement structure in the spacer cavity;
• and
• an articulating liner, the articulating liner including a first end that is received in said spacer cavity, the first end of the articulating liner including a second annular engagement structure for engaging said first annular engagement structure in said spacer cavity, the first end of the articulating liner further including a post that projects beyond said second annular engagement structure for receipt in said tapered bore to provide an interference fit between said post and said tapered bore for axially securing the articulating liner to the spacer, said articulating liner having an annular upper surface from which a concave articulating surface extends for articulating against a convex surface of a glenoid component.

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 an enlarged head portion at a proximal end of the stem, said enlarged head portion including a head portion internal cavity in which an articulating liner can be received, said head portion internal cavity including a first annular engagement structure disposed in the head portion internal cavity;
• an articulating liner receivable in said head portion internal cavity for securing the articulating liner to the enlarged head portion, said articulating liner being substantially wedge-shaped with an annular lower surface opposite an annular upper surface and with a concave articulating surface extending from said annular upper surface for articulating against a convex surface of a glenoid component, wherein said annular upper surface and said annular lower surface define an angle therebetween, and wherein the articulating liner includes a second annular engagement structure projecting from said annular lower surface, said second annular engagement structure configured to engage said first annular engagement structure in the head portion internal 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, the spacer including a post receivable in a bore of said head portion internal cavity for axially securing said metallic spacer to said stem,
• 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, the articulating liner including a post capable of being interchangeably received in (i) the bore of the head portion internal cavity for axially securing said articulating liner to said stem and (ii) a bore of said 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.