Methods of Use of Cartilage Implants

• US 20100121452A1
• Filed: 01/14/2010
• Published: 05/13/2010
• Est. Priority Date: 03/06/2008
• Status: Active Grant

• Current Assignee: Moirai Orthopaedics, LLC
• Original Assignee: Moirai Orthopaedics, LLC
• Inventors: Cook, Stephen D., Strzepa, Peter
• Granted Patent: US 8,152,847 B2
• Time in Patent Office: Days
• US Class Current: 623/14.120
• CPC Class Codes: A61F 2/30756 Cartilage endoprostheses A61F2/3603 takes precedence
• CPC Class Codes: A61F 2/38 for elbows or knees
• CPC Class Codes: A61F 2/3804 for elbows
• CPC Class Codes: A61F 2/40 for shoulders
• CPC Class Codes: A61F 2/4261 for wrists
• CPC Class Codes: A61F 2002/30112 Rounded shapes, e.g. with rounded corners
• CPC Class Codes: A61F 2002/30125 elliptical or oval
• CPC Class Codes: A61F 2002/30299 umbrella-shaped or mushroom-shaped
• CPC Class Codes: A61F 2002/30822 Circumferential grooves
• CPC Class Codes: A61F 2002/30878 with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts
• CPC Class Codes: A61F 2230/0008 elliptical or oval
• CPC Class Codes: A61F 2230/0093 Umbrella-shaped, e.g. mushroom-shaped
• CPC Class Codes: A61F 2310/00011 Metals or alloys
• CPC Class Codes: A61F 2310/00161 Carbon; Graphite
• CPC Class Codes: A61F 2310/00173 Graphite
• CPC Class Codes: A61F 2310/00179 Ceramics or ceramic-like structures
• CPC Class Codes: A61F 2310/00574 Coating or prosthesis-covering structure made of carbon, e.g. of pyrocarbon
• CPC Class Codes: A61F 2310/00796 Coating or prosthesis-covering structure made of a phosphorus-containing compound, e.g. hydroxy(l)apatite
• CPC Class Codes: Y10S 623/908 Bone

Abstract

Methods of using cartilage implant devices are provided. The methods include locating articular cartilage having a leasion, and utilizing an implant having dimensions compatible with the lesion. The method further includes forming a cavity in the articular cartilage, subchondral bone, and cancellous bond, and engaging the implant with the cavity so that the lower face of the articular end of the implant abuts against the subchondral bone, and the stem of the implant abuts against the cancellous bone.

Claims

1. ) A method of repair of articular cartilage comprising:

locating articular cartilage having a lesion;

utilizing an implant having dimensions compatible with the lesion, wherein the implant comprises;

an articular end having a circular perimeter, a convex upper face, and a concave lower face, the convex upper face having a spherical radius and the concave lower face having a spherical radius; and

a stem extending from the concave lower face away from the convex upper face along a vertical axis, the stem having a maximum stem circular perimeter at the intersection of the stem and the concave lower face, the maximum stem circular perimeter less than the articular end circular perimeter

forming a cavity in the articular cartilage, subchondral bone, and cancellous bone; and

engaging the implant with the cavity so that the concave lower face abuts against the subchondral bone and the stem abuts against the cancellous bone.

2. ) method of claim 1, wherein forming the cavity comprises insertion of an autograft, an allograft bone, or various bone graft substitute materials into the lesion.

3. ) A method of repair of articular cartilage comprising:

locating articular cartilage having a lesion;

utilizing an implant having dimensions compatible with the lesion, wherein the implant comprises;

an articular end having an oval perimeter, a convex upper face, and a concave lower face, the convex upper face having a first circular pitch radius and a first circular roll radius, the concave lower face having a first surface comprising a second circular pitch radius and a second circular roll radius, and at least two second surfaces both external to the first surface and each other and both tangent to the first surface, each second surface having a third circular pitch radius and a third circular roll radius, the convex upper face blending into a rim, wherein at least a first and second portion of the rim extends at least a first distance along the vertical axis and a third and fourth portion of the rim tapers inward along the vertical axis, the rim blending into the concave lower face; and

a stem extending from the concave lower face away from the convex upper face, the stem having an oval shaped perimeter in planes perpendicular to the vertical axis forming a cavity in the articular cartilage, subchondral bone, and cancellous bone; and

engaging the implant with the cavity so that the concave lower face abuts against the subchondral bone and the stem abuts against the cancellous bone.

4. method of claim 3, wherein forming the cavity comprises insertion of an autograft, an allograft bone, or various bone graft substitute materials into the lesion.