Fig. 9

Case 4: intraoperative implementation of 3-D planning. Due to close proximity of the tumor (red) to the sacroiliac joint (cyan), an osteotomy plane (green) medially to the joint, but laterally to the sacroiliac foramina, was chosen to retrieve the resection specimen (purple). a Postoperative evaluation. Tumor resection specimen. b Postoperative evaluation. Anterior view of the tumor resection specimen with planned osteotomy plane and maximal error of 4 mm (red). c Postoperative evaluation. Posterior view of the tumor resection specimen with the planned osteotomy plane and maximal error of 4 mm (red). d Postoperative antero-posterior X-ray