Executive Editor: Edward Ellis III, Kazuo Shimozato General Editor: Daniel Buchbinder

Authors: Carl-Peter Cornelius, Nils Gellrich, Søren Hillerup, Kenji Kusumoto, Warren Schubert

Midface - Computer assisted surgery - Zygomatic arch

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Authors: Alexander Schramm, Marc Metzger, Nils Gellrich, Bradley Strong

1 Introduction top


Whenever an intraoperative CT scanner is available, an intraoperative scan should be obtained for intraoperative evaluation of the reduction.


When using computer assisted surgery, the reduction (and fixation if necessary) is performed according to standard procedures as described in the AO Surgery Reference. It should be considered an adjunct to surgical treatment.

Computer assisted surgery in treating fractures allows intraoperative visualization of the reduction using intraoperative imaging combined with image fusion of preoperative and intraoperative CT scans.

With this technique, insufficient fracture reduction can be can be identified and corrected, eliminating the need for secondary procedures which may be necessary if only postoperative imaging is performed. 

Intraoperative imaging requires an additional 10-15 min.

Useful additional reading

2 Preoperative imaging top


The preoperative CT scan shows a displaced isolated zygomatic arch fracture of the left side.

3 Intraoperative assessment of reduction top


To verify that the zygomatic arch has been properly reduced, CT scans can be performed intraoperatively.


The intraoperative CT scan shows anatomic reduction of the bony fragments.


Virtual planning software allows automatic image fusion of preoperative (blue) and intraoperative (gold) CT scans. This allows for a better visualization of the achieved reduction.


In the example shown here, the intraoperative imaging shows an incomplete reduction of the right zygomatic arch.


Without additional morbidity, the reduction of the zygomatic arch could be completed during the same operative session and verified with a second intraoperative scan.

v1.0 2009-12-03