Abstract
Background: Orthopedic trauma care relies on two-dimensional radiograms both before and during the operation. Understanding the three-dimensional nature of complex fractures on plain radiograms is challenging. Modern fluoroscopes can acquire three-dimensional volume datasets even during an operation, but the device limitations constrain the acquired volume to a cube of only 12-cm edge. However, viewing the surrounding intact structures is important to comprehend the fracture in its context. We suggest merging a fluoroscope’s volume scan into a generic bone model to form a composite full-length 3D bone model. Methods: Materials consisted of one cadaver bone and 20 three-dimensional surface models of human femora. Radiograms and computed tomography scans were taken before and after applying a controlled fracture to the bone. A 3D scan of the fracture was acquired using a mobile fluoroscope (Siemens Siremobil). The fracture was fitted into the generic bone models by rigid registration using a modified least-squares algorithm. Registration precision was determined and a clinical appraisal of the composite models obtained. Results: Twenty composite bone models were generated. Average registration precision was 2.0 mm (range 1.6 to 2.6). Average processing time on a laptop computer was 35 s (range 20 to 55). Comparing synthesized radiograms with the actual radiograms of the fractured bone yielded clinically satisfactory results. Conclusion: A three-dimensional full-length representation of a fractured bone can reliably be synthesized from a short scan of the patient’s fracture and a generic bone model. This patient-specific model can subsequently be used for teaching, surgical operation planning, and intraoperative visualization purposes.
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Acknowledgments
The authors thank the following for contributing to this study: Department of Pathology, University Hospital of Basel/Switzerland (Prof. M.J. Mihatsch and Ralf Schoch) for supplying the bone specimen. Department of Radiology, University Hospital, Basel/Switzerland (Ms Severin Dziergwa) for performing repeated computed tomography scans. The AO Research Institute, Davos/Switzerland (Dr. Karsten Schwieger and Mr. Boyko Gueorguiev) for assisting in creating a controlled bone fracture. The AO Development Institute, Davos/Switzerland (Dr. Hanspeter Noser) for granting access to the AO bone database. The AO bone database is available to partner institutes for dedicated research projects. This study was co-funded by the Robert Mathys Foundation, Bettlach/Switzerland (Grant E06-0001) and a donation from Mrs M. Täsch Furger, Stäfa/Switzerland.
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Matthews, F., Messmer, P., Raikov, V. et al. Patient-Specific Three-Dimensional Composite Bone Models for Teaching and Operation Planning. J Digit Imaging 22, 473–482 (2009). https://doi.org/10.1007/s10278-007-9078-8
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DOI: https://doi.org/10.1007/s10278-007-9078-8