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

作者:Sozzi Davide; Gibelli Daniele; Canzi Gabriele; Tagliaferri Alberto; Monticelli Lorenzo; Cappella Annalisa; Bozzetti Alberto; Sforza Chiarella*
来源:Journal of Cranio-Maxillofacial Surgery, 2018, 46(8): 1258-1262.
DOI:10.1016/j.jcms.2018.05.040

摘要

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).
According to Bland-Altman test, intra- and inter-operator repeatability was respectively 87% and 89%. No significant differences in volume or asymmetry index between the control group and the treated patients were observed (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 < 0.05).
Results show that the reconstructed orbits present a morphologically different surface from the unaffected ones.

  • 出版日期2018-8