Prosthesis with surfaces having different textures and method of making the prosthesis

Patent metadata

Field	Value
Publication number	US-2019358041-A1
Application number	US-201916534287-A
Country	US
Kind code	A1
Filing date	Aug 7, 2019
Priority date	May 21, 2009
Publication date	Nov 28, 2019
Grant date	—

Abstract

A joint prosthesis system is suitable for cementless fixation. The system includes a metal implant component that has a mounting surface for supporting an insert. The metal implant component includes a solid metal portion and a porous metal portion. The porous metal portion has surfaces with different characteristics, such as roughness, to improve bone fixation, ease removal of the implant component in a revision surgery, reduce soft tissue irritation, improve the strength of a sintered bond between the solid and porous metal portions, or reduce or eliminate the possibility of blood traveling through the porous metal portion into the joint space. A method of making the joint prosthesis is also disclosed. The invention may also be applied to discrete porous metal implant components, such as augment.

First claim

1 . An orthopaedic prosthetic component, comprising:
a tibial tray component configured to be implanted into a proximal end of a patient's tibia, the tibial tray comprising: a proximal-facing surface configured to receive a polymeric insert component, a distal-facing surface positioned opposite the proximal-facing surface, a central stem extending away from the distal-facing surface to a distal tip, the central stem being positioned on a central sagittal plane of the tibial tray component, and a plurality of pegs spaced apart from the central stem and extending away from the distal-facing surface, each peg extending to a free distal end that is spaced apart from the central sagittal plane of the tibial tray component, wherein the tibial tray component includes a solid metal portion that includes the proximal-facing surface and a porous metal portion that includes the distal-facing surface and has a void space of at least 60% by volume, wherein each peg includes a porous metal body, a first surface section positioned between the distal-facing surface and its free distal end, and a second surface section positioned distal of the first surface section, and wherein the first surface section of each peg has a static coefficient of friction, and the second surface section of each peg has a static coefficient of friction that is lower than the static coefficient of friction of the first surface section of the peg.

2 . The orthopaedic prosthetic component of claim 1 , wherein the second surface section of each peg is positioned at the free distal end of the peg.

3 . The orthopaedic prosthetic component of claim 1 , wherein each peg includes a solid metal portion coupled to the porous metal body, the solid metal portion including the second surface section of the peg.

4 . The orthopaedic prosthetic component of claim 1 , wherein the second surface section of each peg includes a smooth outer surface.

5 . The orthopaedic prosthetic component of claim 1 , wherein:
the central stem includes a porous metal body, a first surface section positioned between the distal-facing surface and its distal tip, and a second surface section positioned distal of the first surface section, and wherein the first surface section of the central stem has a static coefficient of friction, and the second surface section of the central stem has a static coefficient of friction that is lower than the static coefficient of friction of the first surface section of the central stem.

6 . The orthopaedic prosthetic component of claim 5 , wherein the second surface section of the central stem is positioned at the distal tip.

7 . The orthopaedic prosthetic component of claim 5 , wherein the central stem includes a solid metal portion coupled to its porous metal body, the solid metal portion including the second surface section of the central stem.

8 . The orthopaedic prosthetic component of claim 5 , wherein the second surface section of the central stem includes a smooth outer surface.

9 . The orthopaedic prosthetic component of claim 1 , wherein:
the tibial tray component further comprising an outer wall extending between the distal-facing surface and the proximal-facing surface, the solid metal portion includes a proximal section of the outer wall, and the porous metal portion includes a distal section of the outer wall.

10 . An orthopaedic prosthetic component, comprising:
a tibial tray component configured to be implanted into a proximal end of a patient's tibia, the tibial tray comprising: a proximal-facing surface configured to receive a polymeric insert component, a distal-facing surface positioned opposite the proximal-facing surface, a central stem extending away from the distal-facing surface to a distal tip, the central stem being positioned on a central sagittal plane of the tibial tray component, and a plurality of pegs spaced apart from the central stem and extending away from the distal-facing surface, wherein the tibial tray component includes a solid metal portion that includes the proximal-facing surface and a porous metal portion that includes the distal-facing surface and has a void space of at least 60% by volume, wherein the central stem includes a porous metal body, a first surface section positioned between the distal-facing surface and its distal tip, and a second surface section positioned distal of the first surface section, and wherein the first surface section of the central stem has a static coefficient of friction, and the second surface section of the central stem has a static coefficient of friction that is lower than the static coefficient of friction of the first surface section of the central stem.

11 . The orthopaedic prosthetic component of claim 10 , wherein the second surface section of the central stem is positioned at the distal tip.

12 . The orthopaedic prosthetic component of claim 10 , wherein the central stem includes a solid metal portion coupled to its porous metal body, the solid metal portion including the second surface section of the central stem.

13 . The orthopaedic prosthetic component of claim 10 , wherein the second surface section of the central stem includes a smooth outer surface.

14 . The orthopaedic prosthetic component of claim 10 , wherein each peg includes a porous metal body and a solid metal portion coupled to the porous metal body.

15 . The orthopaedic prosthetic component of claim 14 , wherein the solid metal portion of each peg is positioned at a free distal end of the peg that is spaced apart from the central sagittal plane of the tibial tray component.

16 . The orthopaedic prosthetic component of claim 15 , wherein the solid metal portion of each peg includes a smooth outer surface.

Assignees

• Depuy Ireland Ultd Co

Inventors

• Wainscott Stephanie M
• Deffenbaugh Daren L
• Liu Hengda D
• Martin Andrew J
• Rybolt Jeffrey A
• Smith Bryan J
• Zannis Anthony D

Classifications

• B22F7/006

  the porous part being obtained by foaming · CPC title

• A61L27/04

  Metals or alloys · CPC title

• A61F2/4202

  for ankles · CPC title

• C22C27/02

  Alloys based on vanadium, niobium, or tantalum · CPC title

• A61L2400/18

  Modification of implant surfaces in order to improve biocompatibility, cell growth, fixation of biomolecules, e.g. plasma treatment · CPC title