초록 ▼

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 tibia

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.

대표청구항 ▼

A prosthetic system for implantation on the proximal end of a tibia comprising: tibial tray means including a distal surface and a proximal surface opposite said distal surface and a pair of laterally spaced clearance bores therethrough, each clearance bore having a coaxial counterbore communicating

A prosthetic system for implantation on the proximal end of a tibia comprising: tibial tray means including a distal surface and a proximal surface opposite said distal surface and a pair of laterally spaced clearance bores therethrough, each clearance bore having a coaxial counterbore communicating with said proximal surface; wedge means including: a proximal surface intimately received on said distal surface of said tibial tray; and a distal mounting surface engageable with the proximal end of the tibia and having a pair of laterally spaced threaded bores therethrough generally aligned with the clearance bores, respectively, in said tibial tray means; and joinder means for fixedly mounting said wedge means to said tibial tray means prior to implanting said tibial tray means on the proximal end of the tibia, said joinder means including: a pair of cannulated fasteners, each having a head member, a threaded shank extending away from said head member, and a longitudinal bore extending through said head member and through said threaded shank, each of said head members being receivable in an associated one of the counterbore, each of said threaded shanks being threadedly engaged with an associated one of the threaded bores to thereby fixedly attach said wedge means to said tibial tray means; and bone screw means extending through the longitudinal bore of each of said cannulated fasteners for fixedly attaching said tibial tray means and said wedge means to the tibia.