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== Transferring the preoperative planning to the operating theatre ==
[[Image:SSNSchema.jpg|thumb|130 px|left|Schematic representation of the principle of bone segment navigation; DRF1 and DRF2 = IR
The usefulness of the preoperative planning, no matter how accurate, depends on the accuracy of the reproduction of the simulated [[osteotomy]] in the surgical field. The transfer of the planning was mainly based on the surgeon's visual skills. Different guiding headframes were further developed to mechanically guide bone fragment repositioning. {{citation needed}}
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