Bristol-myers Squibb Compnay

Zimmer Gmbh

Audrey M Beckman

Mark Alan Heldreth

John N Insall

William Rohr

Steve Zawadski

Roy Yoshikazu Hori

Vince Webster

Kyoko Ohkuni

Paul D Schoenle

James F Smith

A femoral knee implant includes a fourth compartment of articulation. The superior posterior articulating surface is achieved by first increasing the thickness of the superior posterior condylar portion of the femoral component to widen the superior posterior edge of the posterior condyle. Second, the newly created surface at the superior posterior condyle is smoothly rounded to provide an articular surface with no sharp changes in the surface contours. In one embodiment, the fourth articular compartment of this invention is provided in a one piece femoral design. In another embodiment, it is provided as a modular addition to an existing prior art femoral component. In another embodiment, the fourth compartment is combined with a posterior stabilized (PS) TKR design that includes a tibial post and cooperating femoral cam characterized by low engagement of the cam on the spine.

Four compartment knee

In the subject invention, the articulating component includes a metal tray and a polyethylene bearing molded or otherwise connected to the metal tray. The distal surface of the metal tray, the surface in contact with the tibial component, is highly polished and is substantially flat. The proximal surface of the tibial component, the surface in contact with the articulating component, is likewise highly polished and substantially flat. In use, the two highly polished flat surfaces provide an environment wherein the articulating surface may freely move relative to the tibial component as the patient's knee joint is flexed and extended during movement.

Mobile bearing knee with metal on metal interface

Combined impactor and extractor for prosthetic implants

Growing community of inventors

Warsaw, IN, United States of America

Audrey M Beckman