INTRAMEDULLARY ROD FOR ASSISTING ARTIFICIAL KNEE JOINT REPLACING OPERATION AND METHOD FOR MANAGING OPERATION USING THAT ROD

摘要

An intramedullary rod for assisting artificial knee joint replacing operation comprising a cylindrical body made of an X-ray transmitting material, and a plurality of lines made of an X-ray non-transmitting material and arranged, at a constant interval, in the circumferential direction along the surface part of the cylindrical body to extend spirally in the axial direction, wherein each line is arranged to connect the starting end and the terminating end of the cylindrical body with the shortest distance along the surface part of the cylindrical body. In the transmission image of the cylindrical body, the distance from a reference position to the intersecting position of a pair of lines corresponds to the amount of turning angle of the intramedullary rod. Turning angle of the intramedullary rod can be measured by digitizing the intersecting position.