In craniofacial surgery bone fractures and repositioned bone segments often have to be fixed by titanium miniplates. In clinical routines the surgeon has to fit each miniplate t be used to the individual bone structure of the patient: bending and fitting of a miniplate must frequently be repeated several times. Often up to twenty minutes are required to achieve the best fit of a single osteosynthesis plate. As a patient usually receive several miniplates for bone fixture, he will be exposed to long anaesthesia. In co-operation with the surgeons of the Clinic of Maxillofacial surgery at the University of Heidelberg we have conceived a planning system for the preoperative positioning of miniplates on a model of the patient's skull. The appropriate bending is computed and the bending data are stored for later use by a bending device and an intraoperative positioning aid. The principles of our computer-aided tool are presented in this paper.
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