## 3D Assessment of Osteosynthesis based on 2D Radiographs

• We present a novel method to derive the surface distance of an osteosynthesis plate w.r.t. the patient-specific surface of the distal femur based on postoperative 2D radiographs. In a first step, the implant geometry is used as a calibration object to relate the implant and the individual X-ray images spatially in a virtual X-ray setup. Second, the patient- specific femoral shape and pose are reconstructed by fitting a deformable statistical shape and intensity model (SSIM) to the X-rays. The relative positioning between femur and implant is then assessed in terms of the displacement between the reconstructed 3D shape of the femur and the plate. We believe that the approach presented in this paper constitutes a meaningful tool to elucidate the effect of implant positioning on fracture healing and, ultimately, to derive load recommendations after surgery.

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Author: Moritz Ehlke, Mark Heyland, Sven Märdian, Georg N. Duda, Stefan Zachow In Proceedings Proceedings of the Jahrestagung der Deutschen Gesellschaft für Computer- und Roboterassistierte Chirurgie (CURAC) 317 321 statistical shape and intensity models3d-reconstruction from 2d X-rays; osteosynthesis follow-up 2015 urn:nbn:de:0297-zib-56217

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