PROBLEM TO BE SOLVED: To provide a technique for appropriately deciding on the position of a bone resection surface and the size of an implant before artificial joint replacement.SOLUTION: The artificial joint replacement supporting instrument decides on a front X-ray source, a plane to which a front X-ray photograph belongs, a side X-ray source and a plane to which a side X-ray photograph belongs, and a three-dimensional relative positional relationship (three-dimensional positional relationship between a front tripartite relationship and a side tripartite relationship) in five elements of three-dimensional CAD data (S7), and displays the image of three-dimensional CAD data of an implant on top of an appropriate position in the joint of the X-ray photograph in a display device (S9 and S10).COPYRIGHT: (C)2008,JPO&INPIT【課題】人工関節置換術の術前に骨切り面の位置及びインプラントのサイズを適正に決定する技術の提供。【解決手段】正面レントゲン線源、正面レントゲン写真の属する平面、側面レントゲン線源、側面レントゲン写真の属する平面、3次元CADデータの5つの要素における3次元的な相対位置関係(正面3者関係と側面3者関係との3次元的位置関係)を決定しS7、レントゲン写真の関節における適正な位置に、インプラントの3次元CADデータの影像を重ね合わせて、表示装置に表示するS9、S10。【選択図】図4
