A Novel Parameter Decomposition Approach for Recovering Poses of Distal Locking Holes from Single Calibrated Fluoroscopic Image

  • Guoyan Zheng
  • Xuan Zhang
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 4522)

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 novel parameter decomposition approach for solving this problem using single calibrated X-ray image. 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 in − vitro experimental results, which demonstrate that the accuracy of our approach is adequate for successful distal locking of intramedullary nails.

Keywords

distal locking fluoroscopy pose estimation parameter decomposition hybrid optimization model-based method 

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Copyright information

© Springer Berlin Heidelberg 2007

Authors and Affiliations

  • Guoyan Zheng
    • 1
  • Xuan Zhang
    • 1
  1. 1.MEM Research Center-ISTB, University of Bern, CH-3014, BernSwitzerland

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