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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ERRATUM - A previous version of the ZIB-Report 15-47 (urn:nbn:de:0297-zib-56217) wrongly gave the impression that specimens were provided by the Department of Trauma Surgery, Medical University of Innsbruck, Austria. For the presented study, neither experiments were performed nor specimens provided by the Medical University of Innsbruck. The authors of the report instead re-used CT data that was gathered for a different (independent) experimental study, described in: Märdian, S., Schmölz, W., Schaser, K. D., Duda, G. N., & Heyland, M. (2015), "Interfragmentary lag screw fixation in locking plate constructs increases stiffness in simple fracture patterns", Clinical Biomechanics, 30(8), 814-819. Parts of the text have been edited in the revised version to prescind from any direct involvement of the Medical University of Innsbruck in the presented work. The second revised version fixes incorrect citations by interchanging references [9] and [10] in the "References" section.
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| Author: | Moritz Ehlke, Mark Heyland, Sven Märdian, Georg Duda, Stefan ZachowORCiD |
|---|---|
| Document Type: | ZIB-Report |
| Tag: | 3d-reconstruction from 2d X-rays; osteosynthesis follow-up; statistical shape and intensity models |
| MSC-Classification: | 68-XX COMPUTER SCIENCE (For papers involving machine computations and programs in a specific mathematical area, see Section -04 in that area) / 68-06 Proceedings, conferences, collections, etc. |
| CCS-Classification: | I. Computing Methodologies / I.4 IMAGE PROCESSING AND COMPUTER VISION (REVISED) / I.4.5 Reconstruction |
| Date of first Publication: | 2015/09/28 |
| Series (Serial Number): | ZIB-Report (15-47) |
| ISSN: | 1438-0064 |
