Measurement of in-vivo tibiotalar kinematics after total ankle replacement using dual fluoroscopy

Kinematics of the prosthetic tibiotalar joint in total ankle replacement (TAR) patients have yet to be measured using dual fluoroscopy (DF). These data could improve our clinical understanding of failures in TAR patients, leading to better surgical approaches and implant designs. With dual fluoroscopy, computed tomography (CT) images are acquired to track implant motion. One challenge with this approach is dealing with metal artifact in the CT images. We report a methodology of using computer aided drawing (CAD) models to create a bone and implant hybrid model for tracking in-vivo kinematics. We evaluated a TAR patient to demonstrate the feasibility of this approach.