Importance

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Abstract

A modular prosthetic system for mounting a variety of styles of wedges to a tibial tray in order to correct for bone deficiencies, alternatively, in the anterior/posterior direction and in the medial/lateral direction. The wedge is mounted on the tibial tray before the system is implanted. The tibial tray has a pair of spaced transverse smooth bores and coaxial counterbores and the wedge has a pair of spaced transverse threaded bores which are aligned, respectively, with the smooth bores and counterbores when the wedge is mounted on the tibial tray. Cannulated screws having a head, threaded shank, and longitudinal bore are attached so as to extend through an associated bore and counterbore, then are threadedly engaged with the wedge. A bone screw is then received through the bore of the cannulated screw for implanting the system on the proximal end of the tibia. Mating spherical surfaces, respectively, on the cannulated screw and on the bone screw enable the bone screw to attain an optimal orientation. In the event the system is to be implanted solely with cement rather than with screws, plugs are used to seal the bores in the cannulated screws.

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First Claim