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UCSQ Method Applied on 3D Photogrammetry: Non-Invasive Objective Differentiation Between Synostotic and Positional

Sophia A J Kronig1, Otto D M Kronig1, Henri A Vrooman2

  • 1Department of Plastic and Reconstructive Surgery, University Medical Center Utrecht, The Netherlands.

The Cleft Palate-Craniofacial Journal : Official Publication of the American Cleft Palate-Craniofacial Association
|May 11, 2022
PubMed
Summary
This summary is machine-generated.

This study introduces a radiation-free 3D photogrammetry method using the Utrecht Cranial Shape Quantificator (UCSQ) to differentiate unilateral coronal synostosis (UCS) from positional posterior plagiocephaly (PPP). The method analyzes cranial shape variables for objective diagnosis.

Keywords:
3D photogrammetryclassificationcranial suturedeformationalpositionalsynostosis

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Area of Science:

  • Craniofacial surgery
  • Pediatric plastic surgery
  • Medical imaging

Background:

  • Accurate differentiation between unilateral coronal synostosis (UCS) and positional posterior plagiocephaly (PPP) is crucial for appropriate treatment planning in infants.
  • Traditional diagnostic methods may involve radiation or subjective assessments, highlighting the need for objective, non-invasive techniques.
  • 3D photogrammetry offers a promising avenue for quantitative cranial shape analysis.

Purpose of the Study:

  • To develop and validate an objective method for differentiating unilateral coronal synostosis (UCS) from positional posterior plagiocephaly (PPP).
  • To utilize 3D photogrammetry and the Utrecht Cranial Shape Quantificator (UCSQ) for quantitative cranial shape analysis.
  • To establish reliable diagnostic criteria based on specific cranial asymmetry and gradient ratios.

Main Methods:

  • A retrospective study was conducted on 32 unoperated infants (<1 year) with either UCS (n=17) or PPP (n=15).
  • 3D photogrammetry was employed using the Utrecht Cranial Shape Quantificator (UCSQ) to extract variables from cranial shape.
  • Key variables analyzed included asymmetry ratio of forehead and occiput peaks, ratio of gradients, and peak locations.

Main Results:

  • Significant differences in the location and asymmetry of frontal and occipital peaks were observed between UCS and PPP groups.
  • The frontal peak's asymmetry ratio and gradient ratio, in conjunction with peak location, demonstrated distinct patterns for UCS and PPP.
  • Specific mean x-values for frontal and occipital peaks provided quantitative data for differentiation, with UCSQ successfully capturing these shape variations.

Conclusions:

  • The Utrecht Cranial Shape Quantificator (UCSQ) effectively quantifies cranial shape differences in synostotic and positional plagiocephaly.
  • A novel, radiation-free method using 3D photogrammetry and UCSQ allows for objective differentiation between UCS and PPP.
  • This approach provides a valuable tool for accurate diagnosis and subsequent management of infant cranial deformities.