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Authors: Guoyan Zheng and Xuan Zhang

Affiliation: MEM Research Center – ISTB, University of Bern, Switzerland

Keyword(s): Model-based fitting, parameter decomposition, computer-assisted intramedullary nailing.

Abstract: One of the most difficult steps of intramedullary nailing of femoral shaft fractures is distal locking – the insertion of distal transverse interlocking screws, for which it is necessary to know the position and orientation of the distal locking holes of the intramedullary nail. This paper presents a precise approach for solving this problem using single calibrated X-ray image via parameter decomposition. The problem is formulated as a model-based optimal fitting process, where the to-be-optimized parameters are decomposed into two sets: (a) the angle between the nail axis and its projection on the imaging plane, and (b) the translation and rotation of the geometrical models of the distal locking holes around the nail axis. By using a hybrid optimization technique coupling an evolutionary strategy and a local search algorithm to find the optimal values of the latter set of parameters for any given value of the former one, we reduce the multiple-dimensional model-based optimal fitting problem to a one-dimensional search along a finite interval. We report the results of our in vitro experiments, which demonstrate that the accuracy of our approach is adequate for successful distal locking of intramedullary nails. (More)

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Paper citation in several formats:
Zheng, G. and Zhang, X. (2007). A PRECISE APPROACH FOR RECOVERING POSES OF DISTAL LOCKING HOLES FROM SINGLE CALIBRATED X-RAY IMAGE FOR COMPUTER-ASSISTED INTRAMEDULLARY NAILING OF FEMORAL SHAFT FRACTURES. In Proceedings of the Second International Conference on Computer Vision Theory and Applications (VISAPP 2007) - Computer Vision Methods in Medicine; ISBN 978-972-8865-75-7; ISSN 2184-4321, SciTePress, pages 120-127. DOI: 10.5220/0002066101200127

@conference{computer vision methods in medicine07,
author={Guoyan Zheng. and Xuan Zhang.},
title={A PRECISE APPROACH FOR RECOVERING POSES OF DISTAL LOCKING HOLES FROM SINGLE CALIBRATED X-RAY IMAGE FOR COMPUTER-ASSISTED INTRAMEDULLARY NAILING OF FEMORAL SHAFT FRACTURES},
booktitle={Proceedings of the Second International Conference on Computer Vision Theory and Applications (VISAPP 2007) - Computer Vision Methods in Medicine},
year={2007},
pages={120-127},
publisher={SciTePress},
organization={INSTICC},
doi={10.5220/0002066101200127},
isbn={978-972-8865-75-7},
issn={2184-4321},
}

TY - CONF

JO - Proceedings of the Second International Conference on Computer Vision Theory and Applications (VISAPP 2007) - Computer Vision Methods in Medicine
TI - A PRECISE APPROACH FOR RECOVERING POSES OF DISTAL LOCKING HOLES FROM SINGLE CALIBRATED X-RAY IMAGE FOR COMPUTER-ASSISTED INTRAMEDULLARY NAILING OF FEMORAL SHAFT FRACTURES
SN - 978-972-8865-75-7
IS - 2184-4321
AU - Zheng, G.
AU - Zhang, X.
PY - 2007
SP - 120
EP - 127
DO - 10.5220/0002066101200127
PB - SciTePress

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