Abstract
As a result of the aging society, there is a significant increase in the number of patients of advanced osteoarthritis performing total knee arthroplasty (TKA) in Japan. Using images from upright x-ray fluoroscopy images of the affected knee, a pre-operative planning is conducted for TKA to measure the position of prosthetic joint. This process requires an experienced doctor to interpret the skeletal conformation from them. In place of using these images, creating a 3D image from a CT image of the affected knee would help this task. However, taking an upright CT image is currently difficult due to the functional constraint of the CT device. In this paper, a registration method to generate an upright 3D model of knee joint from a CT image is proposed. This method makes use of an upright x-ray fluoroscopy image as reference. Anatomically based registrations are conducted to femur and tibial bones separately. Our quantity examination and a clinician's perspective against the registered images show that the resulted model provides practical benefits for a better interpretation to the skeletal conformation. Furthermore, the proposed method indicates its ability to generate an upright 3D model of severe knee osteoarthritis from a CT image.
