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Comparison of the ilium screw trajectory and length in postoperative CT (true lateral X-ray re-formation and axial CT-slices) by use of a conventional technique (control group I); showing the shorter ilium screw due to a suboptimal screw trajectory (a, b). Navigation technique based on CT-fluoro matching (group II); showing the longer ilium screw reaching the supra-acetabular region due to an optimal screw trajectory (c, d)
