New York University

Zimmer Gmbh

Other

Pfizer Hospital Products Group, Inc.

Howmedica Corp.

Codman & Shurtleff, Inc.

The Brigham and Women's Hospital, Inc.

Zimmer Technology, Inc.

New York Society for the Relief of the Ruptured and Crippled,

Walker, Peter Stanley

Takai, Shinro

Walker, Peter S., Dr.

Andriacchi, Thomas

Peter Stanley Walker

John Edward Meyers

Frederick C Ewald

Marvin Figueroa

Abraham P Habegger

Michael A Cook

Rodney L Bays

Adam M Griner

Vincent A Webster

G Douglas Letson

Russell Windsor

Joseph A Bosco

Raymond C Parisi

Jeff Blaylock

Matthew P Poggie

Jerry L Aikins

Kathleen Macke

Bill H Haywood

Bill N Sisk

Clarence M Panchison

James C Harris

Douglas G Branscome

Linggawati Tanamal

Thomas Alfred Einhorn

Kelly A Timmons

Gary D Bos

Kimberly Les

Mary I O'Connor

Kim C Bertin

Dwight T Todd

Brian D Byrd

John N Insall

Scott Steffensmeier

Ron Donkers

Rocco R Borzone

Chih-Shing Wei

Peter E Darrigan

Thomas P Vail

Alex Stoller

Rachel E Forman

Lawrence F Peek

Jack D Jennings

Dennis R Aquilo

Shinro Takai

Audrey Patmore

Rowland W Pritchard

Ernest U Conrad

David J Greene

Robert E Montgomery

Ernust U Conrad

Thomas Andriacchi

Nathan Chastain

William F McKay

Herrn Neumann

John E Meyers

Scott J Steffensmeier

Ronald Donkers

Mary I O'conner

George D Letson

Alex P Stoller

A total knee replacement prosthesis is presented whose bearing surfaces are derived from an anatomically representative femur and a modified baseline tibial surface. The contacting femoral and tibial bearing surfaces include the inter-condylar as well as condylar regions. A knee replacement implant includes a femoral component and a tibial component. The femoral component includes an outer femoral bearing surface shaped to match an outer bearing surface of an anatomic femur. The tibial component includes a proximal tibial bearing surface based on a proximal baseline tibial bearing surface that is shaped to conform to an envelope of a composite of sequence of positions and orientations of the femoral component throughout a full range of flexure angles and axial rotation angles of the femur relative to the tibia.

Total knee replacement implant based on normal anatomy and kinematics

The present invention relates to devices and methods for balancing joints, including knee joints. The devices convert unequal forces at a joint to a rotation or displacement of a pointer or gauge. The devices are able to display the relative difference in force between the lateral and medial sides of a joint from flexion to extension. In certain aspects, the devices are useful for balancing the knee during total knee surgery. The devices can be inserted between the trial femoral and tibial components of the knee and measures whether one condyle experiences more force than the other.

Compact mechanical joint balancer

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.

Early intervention knee implant device and methods

A total knee replacement, comprising a femoral and a tibial component in articulating contact that can restore normal joint function. The articulation between the two components is controlled by four guide surfaces.

Replica guided motion knee

A total knee replacement prosthesis is presented whose bearing surfaces are derived from an anatomically representative femur and a modified baseline tibial surface. The contacting femoral and tibial bearing surfaces include the inter-condylar as well as condylar regions. The modified baseline tibial surface is generated by modifying a baseline tibial surface. For example, the baseline tibial surface can be flattened mathematically to generate the modified baseline tibial surface.

An orthopaedic knee prosthesis includes a tibial bearing component with surface features which operate to protect adjacent soft tissues of the natural knee throughout a wide range of flexion. More particularly, the tibial bearing component provides an anterior relief space disposed between the dished lateral and medial articular compartments, in which the relief space is convex as viewed from a sagittal perspective across the medial/lateral extent of the relief space.

Tibial bearing component for a knee prosthesis with improved articular characteristics

A total knee replacement whose bearing surfaces are derived from an anatomically representative femur and a modified baseline tibial surface. The contacting femoral and tibial bearing surfaces include the inter-condylar as well as condylar regions. The modified baseline tibial surface is generated by modifying a baseline tibial surface. For example, the baseline tibial surface can be flattened mathematically to generate the modified baseline tibial surface.

An instrumented linkage system () to facilitate accuracy and efficiency of a surgical procedure is disclosed. The linkage system may be directly attached to a bone and used to register the bone to a computer. The linkage system may also be used to verify the accuracy and alignment of planned resections relative to the bone.

Instrumented linkage system

The modular stem component may include a shaft portion, a head, and a sleeve. The shaft portion is configured for receipt within the intramedullary canal of a bone and the head is configured to receive another component of a modular prosthetic system, such as a femoral neck, thereon. In one exemplary embodiment, the head extends radially around at least a portion of the stem and includes a rib defining a flange extending therefrom. The sleeve, which is formed as an independent part of the modular stem component and is made at least partially of a highly porous biomaterial, includes opposing ends and has a bore extending therethrough. The bore is configured to facilitate sliding receipt of the sleeve on the head.

Modular stem extension

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. 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.

Implants for the treatment of osteoarthritis of the knee

A total knee replacement prosthesis comprising condylar and intercondylar bearing surfaces configured to manage anterior/posterior displacement between the articulating femoral and tibial components.

Total knee replacement substituting function of anterior cruciate ligament

A constrained prosthetic knee having a modular hinge post and a rotating bearing. A cannulated hinge post is rotatably connected to the femoral component of the knee prosthesis so that a hinge post extension may be anteriorly positioned through the hinge post and into the tibial component of the knee prosthesis, after positioning of the femoral component in the femur and the tibial component in the tibia. The hinge post is preassembled to the femoral component so that such assembly is not required during the implantation procedure. A meniscal component forming the rotating bearing of the knee prosthesis is packaged together with the hinge post extension so that the appropriate hinge post extension is readily available. The meniscal component includes a mechanism for preventing lift off of the meniscal component from the tibial component, while allowing rotation of the meniscal component relative to the tibial component.

Constrained prosthetic knee with rotating bearing

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New York, NY, United States of America

Peter Stanley Walker