Patent ID: 6925339

Claim:
A system for registering an orthopedic implant in a computer assisted navigation system, said system comprising: a plurality of differently sized implants; a registration device engageable with each of said plurality of implants in a first predefined relative position; a first reference structure and a second reference structure, each of said reference structures having at least one reference element registerable in the computer assisted navigation system, said first reference structure disposed on said registration device at a predetermined location, said second reference structure detachably securable to each of said plurality of implants; wherein the relative positions of said first and second reference structures differs for each of said plurality of implants when said registration device is engaged at said first predefined location and said second reference structure is secured to a selected one of said implants; wherein said second reference structure is detachably mounted on a handling tool at a predefined location, said handling tool having an attachment feature detachably securable to each of said plurality of implants; wherein said plurality of implants comprises a plurality of hip stems adapted for insertion in a proximal femur; wherein each of said plurality of differently sized hip stems has a generally L-shaped configuration defining a stem portion and a neck portion, said stem portion having a distal end and a proximal end and wherein each of said hip stems includes a mounting interface securable to said handling tool, said mounting interface located proximate said proximal end of said hip stem and wherein said registration device defining at least one graduated space for receiving a distal end of a first one and a second one of said plurality of hip stems, said first and second hip stems engaging said registration device within said at least one graduated space whereby said engagement features of said first and second hip stems are positioned at first and second distances from said first reference structure respectively, said first and second distances being non-equivalent.