The invention relates to a surgical planning system for the reconstruction of missing or damaged bone parts, comprisinga device for reading in of 3D image data regarding at least one osseous donor area,means for processing the 3D image data into structured data, so that osseous portions are distinguished from soft tissues and/or vascular systems,means for reading in of 3D target data regarding a missing or damaged bone part,means for obtaining one or more 3D target curves in relation to the 3D target data and/or the 3D data of the donor area,means for segmentation of the osseous portions of the osseous donor area,means for merging the segments into a reconstruction, wherein the segmentation of the osseous portions adapts 3D target curves to 3D surfaces of the 3D target data.
