@article{ZahnGrotjohannRammetal., author = {Zahn, Robert and Grotjohann, Sarah and Ramm, Heiko and Zachow, Stefan and Putzier, Michael and Perka, Carsten and Tohtz, Stephan}, title = {Pelvic tilt compensates for increased acetabular anteversion}, series = {International Orthopaedics}, volume = {40}, journal = {International Orthopaedics}, number = {8}, doi = {10.1007/s00264-015-2949-6}, pages = {1571 -- 1575}, abstract = {Pelvic tilt determines functional orientation of the acetabulum. In this study, we investigated the interaction of pelvic tilt and functional acetabular anteversion (AA) in supine position.}, language = {en} } @article{RammKahntZachow2012, author = {Ramm, Heiko and Kahnt, Max and Zachow, Stefan}, title = {Patientenspezifische Simulationsmodelle f{\"u}r die funktionelle Analyse von k{\"u}nstlichem Gelenkersatz}, series = {Computer Aided Medical Engineering (CaMe)}, volume = {3}, journal = {Computer Aided Medical Engineering (CaMe)}, number = {2}, pages = {30 -- 36}, year = {2012}, language = {de} } @misc{SharmaHoSaevarssonetal.2012, author = {Sharma, Gulshan and Ho, Karen and Saevarsson, Stefan and Ramm, Heiko and Lieck, Robert and Zachow, Stefan and Anglin, Carolyn}, title = {Knee Pose and Geometry Pre- and Post-Total Knee Arthroplasty Using Computed Tomography}, series = {58th Annual Meeting of the Orthopaedic Research Society (ORS)}, journal = {58th Annual Meeting of the Orthopaedic Research Society (ORS)}, address = {San Francisco, CA}, year = {2012}, language = {en} } @article{SaevarssonSharmaRammetal.2013, author = {Saevarsson, Stefan and Sharma, Gulshan and Ramm, Heiko and Lieck, Robert and Hutchison, Carol and Werle, Jason and Montgomery, Sigrun and Romeo, Carolina and Zachow, Stefan and Anglin, Carolyn}, title = {Kinematic Differences Between Gender Specific And Traditional Knee Implants}, series = {The Journal of Arthroplasty}, volume = {28}, journal = {The Journal of Arthroplasty}, number = {9}, doi = {10.1016/j.arth.2013.01.021}, pages = {1543 -- 1550}, year = {2013}, language = {en} } @inproceedings{StefanGulshanSigrunetal.2012, author = {Stefan, Saevarsson and Gulshan, Sharma and Sigrun, Montgomery and Karen, Ho and Ramm, Heiko and Lieck, Robert and Zachow, Stefan and Hutchison, Carol and Jason, Werle and Carolyn, Anglin}, title = {Kinematic Comparison Between Gender Specific and Traditional Femoral Implants}, series = {67th Canadian Orthopaedic Association (COA) Annual Meeting}, booktitle = {67th Canadian Orthopaedic Association (COA) Annual Meeting}, year = {2012}, language = {en} } @misc{SKGBSetal.2011, author = {SK, Saevarsson and GB, Sharma and S, Montgomery and KCT, Ho and Ramm, Heiko and Lieck, Robert and Zachow, Stefan and C, Anglin}, title = {Kinematic Comparison Between Gender Specific and Traditional Femoral Implants}, series = {Proceedings of the 11th Alberta Biomedical Engineering (BME) Conference (Poster)}, journal = {Proceedings of the 11th Alberta Biomedical Engineering (BME) Conference (Poster)}, pages = {80}, year = {2011}, language = {en} } @article{ZahnGrotjohannRammetal., author = {Zahn, Robert and Grotjohann, Sarah and Ramm, Heiko and Zachow, Stefan and Pumberger, Matthias and Putzier, Michael and Perka, Carsten and Tohtz, Stephan}, title = {Influence of pelvic tilt on functional acetabular orientation}, series = {Technology and Health Care}, volume = {25}, journal = {Technology and Health Care}, number = {3}, publisher = {IOS Press}, doi = {10.3233/THC-161281}, pages = {557 -- 565}, language = {en} } @inproceedings{KahntRammLameckeretal.2012, author = {Kahnt, Max and Ramm, Heiko and Lamecker, Hans and Zachow, Stefan}, title = {Feature-Preserving, Multi-Material Mesh Generation using Hierarchical Oracles}, series = {Proc. MICCAI Workshop on Mesh Processing in Medical Image Analysis (MeshMed)}, volume = {7599}, booktitle = {Proc. MICCAI Workshop on Mesh Processing in Medical Image Analysis (MeshMed)}, editor = {Levine, Joshua A. and Paulsen, Rasmus R. and Zhang, Yongjie}, pages = {101 -- 111}, year = {2012}, language = {en} } @misc{EhlkeRammLameckeretal., author = {Ehlke, Moritz and Ramm, Heiko and Lamecker, Hans and Hege, Hans-Christian and Zachow, Stefan}, title = {Fast Generation of Virtual X-ray Images from Deformable Tetrahedral Meshes}, issn = {1438-0064}, url = {http://nbn-resolving.de/urn:nbn:de:0297-zib-41896}, abstract = {We propose a novel GPU-based approach to render virtual X-ray projections of deformable tetrahedral meshes. These meshes represent the shape and the internal density distribution of a particular anatomical structure and are derived from statistical shape and intensity models (SSIMs). We apply our method to improve the geometric reconstruction of 3D anatomy (e.g.\ pelvic bone) from 2D X-ray images. For that purpose, shape and density of a tetrahedral mesh are varied and virtual X-ray projections are generated within an optimization process until the similarity between the computed virtual X-ray and the respective anatomy depicted in a given clinical X-ray is maximized. The OpenGL implementation presented in this work deforms and projects tetrahedral meshes of high resolution (200.000+ tetrahedra) at interactive rates. It generates virtual X-rays that accurately depict the density distribution of an anatomy of interest. Compared to existing methods that accumulate X-ray attenuation in deformable meshes, our novel approach significantly boosts the deformation/projection performance. The proposed projection algorithm scales better with respect to mesh resolution and complexity of the density distribution, and the combined deformation and projection on the GPU scales better with respect to the number of deformation parameters. The gain in performance allows for a larger number of cycles in the optimization process. Consequently, it reduces the risk of being stuck in a local optimum. We believe that our approach contributes in orthopedic surgery, where 3D anatomy information needs to be extracted from 2D X-rays to support surgeons in better planning joint replacements.}, language = {en} } @article{EhlkeRammLameckeretal.2013, author = {Ehlke, Moritz and Ramm, Heiko and Lamecker, Hans and Hege, Hans-Christian and Zachow, Stefan}, title = {Fast Generation of Virtual X-ray Images for Reconstruction of 3D Anatomy}, series = {IEEE Transactions on Visualization and Computer Graphics}, volume = {19}, journal = {IEEE Transactions on Visualization and Computer Graphics}, number = {12}, doi = {10.1109/TVCG.2013.159}, url = {http://nbn-resolving.de/urn:nbn:de:0297-zib-35928}, pages = {2673 -- 2682}, year = {2013}, language = {en} }