Patent ID: 6620168
Filing Date: 2003-09-16
Classification: A61B,A61F

Abstract:
A positioning apparatus for determining the required offset for a tibial implant including a baseplate and an adjustable stem offset with respect to a center of a perimeter of a tibial plateau, said apparatus comprising:a stem for insertion into the medullary canal of the tibia, said stem having a portion extending proximally of said tibial plateau and having a diameter approximately the diameter of said canal; a template having a size and shape approximating the tibial plateau including an internal bore having a diameter larger than the diameter of said stem, and including angular position markers around a circumference of said bore; and a bushing having an internal bore for receiving the proximal portion of said stem and having an outer surface rotatably receivable in said internal bore of said template, said internal bore of said bushing being offset with respect to said internal bore in said template, wherein said template includes a separate generally cylindrical positioning guide having an internal bore and including said circumferential angular position markers.