# US 10,441,428 B2 · Early intervention knee implant device and methods > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,441,428 B2 - Document ID: US10441428B2 - Status: Granted - Kind: B2 - Application number: 13/099,967 - Filed: 2011-05-03 - Published: 2012-05-10 - Granted: 2019-10-15 - Earliest claimed: 2010-05-03 - Assignees: New York University - Applicants: Peter Stanley Walker; Joseph A. Bosco - Inventors: Peter Stanley Walker; Joseph A. Bosco - Web page: https://patentgrep.com/patent/US10441428B2 ## CPC - A61F 2/3859: {Femoral components} - A61B 17/155: {Cutting femur} - A61B 17/157: {Cutting tibia} - A61F 2/389: {Tibial components (A61F2/3868 takes precedence)} - A61F 2002/30878: {with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts} - A61F 2002/30884: {Fins or wings, e.g. longitudinal wings for preventing rotation within the bone cavity} - A61F 2002/30889: {Arcuate pegs} - A61F 2002/30891: {Plurality of protrusions} - A61F 2002/30892: {parallel} - A61F 2002/3895: {unicompartimental} - A61F: FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS (dental prosthetics A61C) - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) ## Abstract A replacement knee implant has a femoral implant and a tibial implant, each of which are inset in a bone surface. The tibial implant is generally elongated with one end rounded and an opposite end conforming to the shape of the tibia, and is made of a metal alloy or a ceramic. The upper surface is dished while the lower surface is planar and can be parallel or sloped relative to the upper surface, and can have a keel for fixation. The femoral implant for implementation in a femoral condyle is rounded such that, when implemented, the femoral implant is flush at the anterior and posterior sides and protruding away from the femur between the anterior and posterior ends. The femoral implant can have an elongated keel for extending into the femur, and can be made from a highly cross-linked polyethylene. ## Claims ### Claim 1 A tibial resurfacing implant, comprising: a tibial implant structure having a single dished morphology that is characterized with respect to a coordinate system including an x-axis, a y-axis and a z-axis as having a planar, tibia-facing surface at an end opposite to a femur-facing surface, wherein the tibial implant structure extends in a direction of the y-axis between the femur-facing surface that extends transverse to the y-axis and is bounded by a femur-facing periphery, and the planar tibia-facing surface that extends transverse to the y-axis and is bounded by a tibia-facing periphery, wherein the tibial implant structure has a perimeter surface extending between the femur-facing periphery and the tibia-facing periphery, wherein the perimeter surface includes: i. a planar portion extending transverse to the z-axis and bounded by a first portion of the tibia-facing periphery, a first portion of the femur-facing periphery, a first lateral edge and a second lateral edge, and ii. an annulus-like perimeter surface portion extending in part, about the y-axis and bounded by a second portion of the tibia-facing periphery, a second portion of the femur-facing periphery, the first lateral edge and the second lateral edge, and wherein the annulus-like perimeter surface portion is configured to conform substantially to a perimeter of a tibia; wherein the femur-facing surface is characterized by the single dished morphology; wherein the planar, tibia-facing surface includes a keel extending therefrom in a direction substantially parallel to the planar portion of the perimeter surface; and wherein the tibial implant structure varies in thickness in the direction of the y-axis at one or more regions whereby the planar portion of the perimeter surface and the planar tibia-facing surface are configured to conform to respective slopes of a medial tibial bone resection in frontal and sagittal planes, the planar tibia-facing surface tapering downward medially in the frontal plane relative to a first plane that is substantially perpendicular to a second plane that is substantially parallel to the keel, such that a medial end region of the tibial implant structure is thicker than a lateral end region, and tapering downward posteriorly in the sagittal plane such that a posterior end region of the tibial implant structure is thicker than an anterior end region, wherein the planar, tibia-facing surface has a greater taper downward posteriorly in the sagittal plane than downward medially in the frontal plane. ### Claim 2 (depends on 1) The tibial implant of claim 1, the planar, tibia-facing surface being non-perpendicular to the keel. ### Claim 3 (depends on 1) The tibial implant of claim 1, the keel including a cylindrical portion extending from an anterior end of the keel to a posterior end of the keel, the diameter of the cylindrical portion at the anterior end of the keel approximating the diameter of the cylindrical portion at the posterior end of the keel. ### Claim 4 (depends on 3) The tibial implant of claim 3, the cylindrical portion having annular notches or extrusions. ### Claim 5 (depends on 4) The tibial implant of claim 4, the cylindrical portion having annular notches or extrusions between 0.1 and 0.2 mm relative to the diameter of the cylindrical portion. ### Claim 6 (depends on 3) The tibial implant of claim 3, the diameter of the cylindrical portion at the anterior end of the keel being greater than the diameter of the cylindrical portion at the posterior end of the keel. ### Claim 7 (depends on 3) The tibial implant of claim 3, wherein a distance between the tibial-facing surface and cylindrical portion at the posterior end of the keel is greater than a distance between the tibial-facing surface and the cylindrical portion at the anterior end of the keel. ### Claim 8 (depends on 7) The tibial implant of claim 7, wherein a difference between the distance between the tibial-facing surface and cylindrical portion at the anterior end of the keel and the distance between the tibial-facing surface and the cylindrical portion at the posterior end of the keel is between about 0.2 mm and 0.5 mm. ### Claim 9 (depends on 3) The tibial implant of claim 3, further comprising one or more coated regions. ### Claim 10 (depends on 1) The tibial implant of claim 1, the planar, tibia-facing surface tapering downward posteriorly in the sagittal plane at an angle between about 3 degrees and about 8 degrees. ### Claim 11 (depends on 1) The tibial implant of claim 1, which is a one-piece implant. ### Claim 12 (depends on 1) The tibial implant of claim 1, the tibial-facing surface being textured. ### Claim 13 (depends on 1) The tibial implant of claim 1, having a thickness of 5 mm or less at its thinnest point along the y-axis of the structure. ### Claim 14 (depends on 1) The tibial implant of claim 1, wherein the implant is configured to conform to the medial tibial bone resection having a medial slope in the frontal plane of between about 3 and about 8 degrees. ### Claim 15 (depends on 1) The tibial implant of claim 1, wherein the implant is configured to conform to the medial tibial bone resection having a posterior slope in the sagittal plane of between about 3 and about 8 degrees. ### Claim 16 (depends on 1) The tibial implant of claim 1, comprising at least one of cobalt chrome alloy, titanium alloy and ceramic. ### Claim 17 (depends on 1) A knee implant set, comprising: in combination, the tibial resurfacing implant of claim 1 and a femoral resurfacing implant. ### Claim 18 (depends on 1) The tibial implant of claim 1, wherein a portion of the annulus-like perimeter surface portion and the planar tibia-facing surface intersect at the second portion of the tibia-facing periphery at an angle less than 90 degrees. ### Claim 19 (depends on 1) The tibial implant of claim 1, wherein the planar, tibia-facing surface tapers downward medially in the frontal plane at an angle between about 3 degrees and about 8 degrees. ### Claim 20 (depends on 1) The tibial implant of claim 1, wherein the planar, tibia-facing surface tapers downward medially in the frontal plane at an angle of 5 degrees. ### Claim 21 (depends on 1) The tibial implant of claim 1, wherein the planar, tibia-facing surface tapers downward posteriorly in the sagittal plane at an angle of 7 degrees. ### Claim 22 (depends on 1) The tibial implant of claim 1, wherein the planar, tibia-facing surface tapers downward medially in the frontal plane at an angle of 5 degrees and downward posteriorly in the sagittal plane at an angle of 7 degrees. ### Claim 23 (depends on 1) The tibial implant of claim 1, wherein the planar, tibia-facing surface tapers downward medially in the frontal plane at an angle that is based on a determined varus tilt of the tibia.