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'''Bone segment navigation''' is a surgical method used in the field to find the anatomical position of displaced bone fragments in fractures, allowing a good fixation by [[osteosynthesis]]. It has been developed for the first time in [[
After an accident or injury, a fracture can be produced and the resulting bony fragments can be displaced. In the oral and maxillofacial area, such a discplacement could have a major effect both on facial aesthetics and organ function: a fracture occurring in a bone that delimits the [[orbit (anatomy)|orbit]] can lead to [[diplopia]]; a [[Human mandible|mandibula]]r fracture can induce significant modifications of the [[occlusion (dentistry)|dental occlusion]]; in the same manner, a skull ([[neurocranium]]) fracture can produce an increased [[intracranial pressure]].
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[[Image:SurgicalPlanningLUCAS1.jpg|thumb|Textured image of the same virtual model]]
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An [[osteotomy]] is a surgical intervention that consists of cutting through bone and repositioning the resulting fragments in the correct anatomical place. To insure optimal repositioning of the bony structures by [[osteotomy]], the intervention can be planned in advance and simulated. The surgical simulation is a key factor in reducing the actual operating time. Often, during this kind of operation, the surgical access to the bone segments is very limited by the presence of the soft tissues: muscles, fat tissue and skin - thus, the correct anatomical repositioning is very difficult to assess, or even impossible. This led to the necessity of a preoperative planning and simulation on models of the bare bony structures.
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