Introduction: The use of navigation systems has been established in different fields of trauma and orthopaedic surgery. Due to continuous development of surgical technique and navigation systems, more complex applications in pelvic surgery were allowed. Most important precondition for successfully use of computer assisted navigation is correct indication for different systems. With experienced use of surgical navigation techniques indications are defined for CT- based technique in pelvic tumour surgery. 3D C-arm based navigation can't show pelvic dimensions because of limited 3D cuboid data volume of 12.5 cm in each direction. 2D C Arm based navigation is inapplicably due to special anatomical conditions without possibility of clear visualisation of anatomic tumour margin. New possibility of data fusion of MRI and CT data sets for individual planning enable optimal preoperative planning of resection lines and matching regions. Methods: CT based navigation was planned for fife tumour resections. In four patients CT data set was used for planning of resection lines, in two of them CT data set was fused with MRI for visualisation of soft tissue tumour. Tumour was located in two cases in sacrum and in two cases in supraacetabular region, mtraoperative reconstruction model enables precise landmark matching. For optimal matching result surface matching was additionally done in all four cases. Resection was done with navigated placed K wires for making of sawing lines in supraacetabular region, for sacral resections navigated straight and bended chisels were used.
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