Assessing the precision of posttraumatic orbital reconstruction through "mirror" orbital superimposition: A novel approach for testing the anatomical accuracy

• Published in: Journal of cranio-maxillo-facial surgery 2018-08, Vol.46 (8), p.1258-1262
• Main Authors: Sozzi, Davide, Gibelli, Daniele, Canzi, Gabriele, Tagliaferri, Alberto, Monticelli, Lorenzo, Cappella, Annalisa, Bozzetti, Alberto, Sforza, Chiarella
• Format: Article
• Language: English
• Subjects: Adult; Aged; Dentistry; Female; Humans; Imaging, Three-Dimensional; Male; Middle Aged; Orbit - diagnostic imaging; Orbit - pathology; Orbit - surgery; Orbital Fractures - diagnostic imaging; Orbital Fractures - pathology; Orbital Fractures - surgery; Reconstructive Surgical Procedures - methods; Retrospective Studies; Tomography, X-Ray Computed; Young Adult
• ISSN: 1010-5182; 1878-4119
• DOI: 10.1016/j.jcms.2018.05.040

Orbital reconstruction in cases of trauma is usually performed using the unaffected side orbital volume as a reference, but this measurement does not fully consider the anatomical characteristics of orbital surfaces. We propose a novel procedure based on the registration of 3D orbital segmented surfaces. Reconstructed orbits from 20 patients and healthy orbits from 13 control subjects were segmented from the post-operative CT-scans. The 3D orbital model from the unaffected orbit was "mirrored" according to the sagittal plane and superimposed onto the reconstructed one, with calculation of volumes, asymmetry index and point-to-point RMS (root mean square) distances. Inter- and intra-observer errors were tested through Bland-Altman plot. Differences in volume, asymmetry index and RMS value between the control group and the treated patients were assessed through two-way ANOVA and Student's t-test (p  0.05), but the RMS value was significantly larger in the latter ones (on average, 0.90 ± 0.26 mm vs. 0.67 ± 0.17 mm, p