One of radical cures of hip joint diseases is a replacement operation to an artificial hip joint. In general, the preoperative examination is indispensable for this operation in order to determine an adequate shape of an artificial hip joint. A patient usually receives Computed Tomography (CT) examination to obtain a preoperative 3D shape of a patient's joint. However, radiation exposure by CT scan is much higher than the one by radioscopy, which is typically used for a diagnosis of osseous anomalies. This papaer proposes a method to estimate a 3D shape of patient's femur from two radiographs and a parametric femoral model. Firstly, we develop the parametric femoral model utilizing statistical procedure of 3D femoral two 2D images using a distance map constructed by the Level Set Method. Experiments using synthesized images are carrried out to verify the fundamental performance of the proposed technique.
