5426
eng
reportzib
0
--
2015-01-04
--
Assessing the Relative Positioning of an Osteosynthesis Plate to the Patient-Specific Femoral Shape from Plain 2D Radiographs
We present a novel method to derive the surface distance of an osteosynthesis plate w.r.t. the patientspecific surface of the distal femur based on 2D Xray images. Our goal is to study from clinical data, how the platetobone distance affects bone healing. The patientspecific 3D shape of the femur is, however, seldom recorded for cases of femoral osteosynthesis since this typically requires Computed Tomography (CT), which comes at high cost and radiation dose. Our method instead utilizes two postoperative Xray images to derive the femoral shape and thus can be applied on radiographs that are taken in clinical routine for followup. First, the implant geometry is used as a calibration object to relate the implant and the individual Xray images spatially in a virtual Xray setup. In a second step, the patientspecific femoral shape and pose are reconstructed in the virtual setup by fitting a deformable statistical shape and intensity model (SSIM) to the images. The relative positioning between femur and implant is then assessed in terms of displacement between the reconstructed 3D shape of the femur and the plate. A preliminary evaluation based on 4 cadaver datasets shows that the method derives the platetobone distance with a mean absolute error of less than 1mm and a maximum error of 4.7 mm compared to ground truth from CT. We believe that the approach presented in this paper constitutes a meaningful tool to elucidate the effect of implant positioning on fracture healing.
1438-0064
urn:nbn:de:0297-zib-54268
Appeared in: Proceedings of the 15th Annual Meeting of CAOS-International (CAOS)
Moritz Ehlke
Moritz Ehlke
Mark Heyland
Sven Märdian
Georg Duda
Stefan Zachow
ZIB-Report
15-21
eng
uncontrolled
3d-reconstruction from 2d Xrays
eng
uncontrolled
statistical shape and intensity models
eng
uncontrolled
fracture fixation of the distal femur
eng
uncontrolled
pose estimation
Reconstruction
Health
Proceedings, conferences, collections, etc.
Visual Data Analysis
Therapy Planning
Ehlke, Moritz
Zachow, Stefan
BSRT-3DFromXray
ECMath-CH8
Trauma
Visual and Data-centric Computing
https://opus4.kobv.de/opus4-zib/files/5426/ZIB-Report-15-21.pdf
https://opus4.kobv.de/opus4-zib/files/5426/ZIBReport_15-21-REVISED.pdf
5621
eng
reportzib
0
--
2015-09-28
--
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.
1438-0064
urn:nbn:de:0297-zib-56217
Moritz Ehlke
Moritz Ehlke
Mark Heyland
Sven Märdian
Georg Duda
Stefan Zachow
ZIB-Report
15-47
eng
uncontrolled
3d-reconstruction from 2d X-rays
eng
uncontrolled
statistical shape and intensity models
eng
uncontrolled
osteosynthesis follow-up
Reconstruction
Proceedings, conferences, collections, etc.
Visual Data Analysis
Therapy Planning
Ehlke, Moritz
Zachow, Stefan
BSRT-3DFromXray
Trauma
Visual and Data-centric Computing
https://opus4.kobv.de/opus4-zib/files/5621/ZIBReport_15-47.pdf
https://opus4.kobv.de/opus4-zib/files/5621/ZIBReport_15-47_REVISED.pdf
https://opus4.kobv.de/opus4-zib/files/5621/ZIB-Report_rev2.pdf