PROBLEM TO BE SOLVED: To achieve downsizing and simplification of a device configuration and satisfactorily perform artificial joint replacement by reducing burden on patients and operators.SOLUTION: A CT image of the vicinity of a pelvis is acquired before an operation, and a three-dimension model of a pelvis portion is created on a computer. Using the virtual three-dimensional bone model, the installation position of a guide instrument and the like are planned, and a virtual three-dimensional operative site model including the guide instrument is constructed. Next, during the operation, the guide instrument is installed, a three-dimensional image of an operative site is acquired, and a measured three-dimensional operative site model including the guide instrument is acquired. The virtual three-dimensional operative site model and the measured three-dimensional operative site model are compared to detect an error between an ideal guide instrument installation position and an actual guide instrument installation position, and an operator is guided such that the error decreases.COPYRIGHT: (C)2014,JPO&INPIT【課題】 装置構成の小型化、簡略化を図るとともに、患者及び術者の負担を軽減して、良好に人工関節置換を行う。【解決手段】 骨盤付近のCT画像を術前に取得し、骨盤部分の3Dモデルをコンピュータ上で作成する。前記仮想3D骨モデルを利用して、ガイド器具の設置位置などを計画し、ガイド器具を含めた仮想3D元術部モデルを構築する。次に、術中において、ガイド器具を設置し、術部の3D画像を取得して、ガイド器具を含めた実測3D術部モデルを取得する。仮想3D術部モデルと、実測3D術部モデルを対比し、理想的なガイド器具の設置位置と、実際のガイド器具の設置位置の誤差を検出し、誤差が小さくなるように術者を誘導する。【選択図】図1
