Facial asymmetry quantitative evaluation in oculoa

Authors: Renzo Manara Giovanni Schifano Davide Brotto Rodica Mardari Sara Ghiselli Antonio Gerunda Cristina Ghirotto Stefano Fusetti Katherine Piacentile Renato Scienza Mario Ermani Alessandro Martini

Publish Date: 2015/11/18

Volume: 20, Issue: 2, Pages: 219-225

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Abstract

Facial asymmetries in oculoauriculovertebral spectrum OAVS patients might require surgical corrections that are mostly based on qualitative approach and surgeon’s experience The present study aimed to develop a quantitative 3D CT imagingbased procedure suitable for maxillofacial surgery planning in OAVS patientsThirteen OAVS patients mean age 35 ± 40 years range 02–142 6 females and 13 controls mean age 71 ± 53 years range 06–157 5 females who underwent head CT examination were retrospectively enrolled Eight bilateral anatomical facial landmarks were defined on 3D CT images porion orbitale most anterior point of frontozygomatic suture most superior point of temporozygomatic suture most posteriorlateral point of the maxilla gonion condylion mental foramen and distance from orthogonal planes in millimeters was used to evaluate the asymmetry on each axis and to calculate a global asymmetry index of each anatomical landmark Mean asymmetry values and relative confidence intervals were obtained from the control groupOAVS patients showed 25 ± 18 landmarks above the confidence interval while considering the global asymmetry values 12 patients 92  showed at least one pathologically asymmetric landmark Considering each axis the mean number of pathologically asymmetric landmarks increased to 55 ± 26 p = 0002 and all patients presented at least one significant landmark asymmetryModern CTbased 3D reconstructions allow accurate assessment of facial bone asymmetries in patients affected by OAVS The evaluation as a global score and in different orthogonal axes provides precise quantitative data suitable for maxillofacial surgical planningThis study had been approved by the ethic committee and was performed in accordance with the ethical standards laid down in the 1964 Declaration of Helsinki and its later amendments All details that might disclose the identity of the subjects under study have been omitted Informed consent was obtained from all OAVS patients included in the study the controls were retrieved from our PACs As in our country no consent is required for the retrospective analysis of exams controls did not provide an informed consent

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