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Proceedings Paper

Surface-based determination of the pelvic coordinate system
Author(s): Lorenz Fieten; Jörg Eschweiler; Stefan Heger; Koroush Kabir; Sascha Gravius; Matías de la Fuente; Klaus Radermacher
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Paper Abstract

In total hip replacement (THR) one technical factor influencing the risk of dislocation is cup orientation. Computer-assisted surgery systems allow for cup navigation in anatomy-based reference frames. The pelvic coordinate system most used for cup navigation in THR is based on the mid-sagittal plane (MSP) and the anterior pelvic plane (APP). From a geometrical point of view, the MSP can be considered as a mirror plane, whereas the APP can be considered as a tangent plane comprising the anterior superior iliac spines (ASIS) and the pubic tubercles. In most systems relying on the pelvic coordinate system, the most anterior points of the ASIS and the pubic tubercles are selected manually. As manual selection of landmark points is a tedious, time-consuming and error-prone task, a surface-based approach for combined MSP and APP computation is presented in this paper: Homologous points defining the MSP and the landmark points defining the APP are selected automatically from surface patches. It is investigated how MSP computation can benefit from APP computation and vice versa, and clinical perspectives of combined MSP and APP computation are discussed. Experimental results on computed tomography data show that the surface-based approach can improve accuracy.

Paper Details

Date Published: 13 March 2009
PDF: 10 pages
Proc. SPIE 7261, Medical Imaging 2009: Visualization, Image-Guided Procedures, and Modeling, 726138 (13 March 2009); doi: 10.1117/12.812321
Show Author Affiliations
Lorenz Fieten, Helmholtz Institute for Biomedical Engineering, RWTH Aachen Univ. (Germany)
Jörg Eschweiler, Helmholtz Institute for Biomedical Engineering, RWTH Aachen Univ. (Germany)
Stefan Heger, Helmholtz Institute for Biomedical Engineering, RWTH Aachen Univ. (Germany)
Koroush Kabir, Univ. Hospital Bonn (Germany)
Sascha Gravius, Univ. Hospital Bonn (Germany)
Matías de la Fuente, Helmholtz Institute for Biomedical Engineering, RWTH Aachen Univ. (Germany)
Klaus Radermacher, Helmholtz Institute for Biomedical Engineering, RWTH Aachen Univ. (Germany)


Published in SPIE Proceedings Vol. 7261:
Medical Imaging 2009: Visualization, Image-Guided Procedures, and Modeling
Michael I. Miga; Kenneth H. Wong, Editor(s)

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