Trigon Incorporated

David J Stumpo

Scott A Jones

Donald A Stevens

Peter F Sharkey

The present invention provides a femoral component, and a method for surgical implantation of a femoral prosthesis, comprised of a revision knee implant and corresponding cutting block system. In particular, the revision knee implant, comprised of a femoral component having incremental markings thereon and a femoral stem, and corresponding cutting block system having corresponding incremental markings thereon, enables a surgeon maximally to position the cutting block adjacent as much area as possible of a distal femur of a patient and to infinitely position the femoral component in the exact position indicated by the cutting block.

Prosthetic revision knee system

A tibial implant is provided having a stem, a tray, a bushing for joining the stem and the tray, and a locking member. In use, the stem of the implant is inserted into the medullary canal of a natural tibia and the tray rests on a resected surface at the proximal end of the tibia. The tray includes a central position and an engagement portion on a lower surface thereof. The bushing includes a proximal axis of alignment in alignment with the central position of the tray and a distal axis of alignment that is co-linear to the longitudinal axis of the stem. The engagement portion of the tray is comprised of a dovetailed ring member. The bushing also includes, on a proximal end thereof, an engagement surface having first and second pairs of surfaces for, respectively, passage through the opening of the ring member and sliding complementary engagement with the dovetailed ring member. The engagement surface of the bushing, when positioned within the ring member of the tray, is freely rotatable within the ring member about the proximal axis. The distal and proximal axes of alignment may be co-linear or spaced from each other a distance up to about 10 mm to allow the center of the tray to be offset from the longitudinal axis of the stem, thereby accommodating a variety of patient anatomies. The locking member locks the bushing in a desired degree of rotation within the ring. A system comprising interchangeable components is also provided.

Growing community of inventors

Venetia, PA, United States of America

David J Stumpo