Osteonics Corp.

Christopher G Sidebotham

Robert G Averill

Donald E McNulty

Alfred J Zarnowski

Alex Khowaylo

Alan M Lombardo

A knee prosthesis system includes a tibial component having a tray element, a femoral component having laterally spaced apart condylar elements, a modular bearing member for being selected and seated within the tray element of the tibial component to provide a bearing support for the condylar elements of the femoral component for operation of the knee prothesis, the bearing member including an eminence projecting superiorly for reception between the condylar elements of the femoral component to provide controlled restraint against excessive relative movement between the femoral component and the tibial component, including control of the anterior-posterior portions of the relative movement, and a stabilizing post within the eminence for reinforcing and stabilizing the eminence against forces exerted upon the eminence during operation of the knee prosthesis.

Modular knee prosthesis system

A cutting guide for guiding a saw blade during the preparation of a femur for the implant of the femoral component of a knee prothesis includes guide surfaces for enabling the cutting of all four of the anterior femoral cut, the posterior femoral cut, the anterior chamfer and the posterior chamfer, fully and completely, with certitude and accuracy, while the cutting guide remains located and secured to the femur in a single position on a transverse surface located along the distal femur.

Femoral cutting guide

Method and apparatus for preparing the bone at a joint for the implant of a component part of a prosthetic device include a contouring guide placed on the bone at a predetermined site and having a guide rail for delineating a path of travel to which a contouring cutter is confined while translated along the contouring guide for removing bone along a surface of predetermined area and contour to establish an accurately defined seating area for the component part with minimal intrusion into the joint.

Method and apparatus for implanting a prosthetic device

A knee prosthesis in which articular surface areas of the engaged femoral and tibial components of the prosthesis include surface profile contours lying in a common arcuate profile defined by a medial-lateral radius having an origin lying on the mechanical axis passing through the femoral head of the corresponding hip joint such that limited misalignment of the femoral and tibial components by virtue of angular deviation from the mechanical axis resulting from relative displacement in a medial-lateral direction is tolerated to accommodate the misalignment while maintaining area engagement between the engaged surfaces.

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Scotchtown, NY, United States of America

Christopher G Sidebotham