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Craniometric Analysis of Frontal Cranial Morphology Following Posterior Vault Distraction
Netanja S Ter Maaten1, Daniel M Mazzaferro1, Ari M Wes1
1Division of Plastic and Reconstructive Surgery, University of Pennsylvania and The Children's Hospital of Philadelphia, Philadelphia, PA.
Insights
Posterior vault distraction osteogenesis (PVDO) improves frontal contour in infants with syndromic craniosynostosis by reducing supraorbital retrusion and frontal bossing. This procedure enhances cranial volume and may reduce the need for subsequent frontal surgery.
Area of Science:
- Craniofacial Surgery
- Pediatric Neurosurgery
- Plastic Surgery
Background:
- Posterior vault distraction osteogenesis (PVDO) is a surgical technique used to address craniofacial abnormalities.
- It is hypothesized to improve frontal contour in infants with syndromic craniosynostosis and turribrachycephaly.
- Objective craniometric analysis is needed to quantify PVDO's effect on anterior cranial morphology.
Purpose of the Study:
- To objectively analyze the craniometric changes in anterior cranial morphology following PVDO.
- To determine the impact of PVDO on supraorbital retrusion and basofrontal angle.
- To evaluate the efficacy of PVDO in improving frontal contour in syndromic craniosynostosis.
Main Methods:
- Retrospective review of patients who underwent PVDO.
- Inclusion of patients with pre- and postoperative CT scans.
- Volumetric and craniometric analysis using Mimics software, with statistical comparison using paired t-test and Wilcoxon rank-sum test.
Main Results:
- PVDO significantly increased total cranial volume (249 ± 159 cm³).
- Supraorbital retrusion decreased significantly (5.44 ± 3.89 mm to 4.54 ± 3.91 mm).
- Basofrontal angle decreased significantly (2.92 ± 2.16 degrees), particularly in younger patients.
Conclusions:
- PVDO effectively improves frontal contour by reducing supraorbital retrusion and frontal bossing.
- The procedure leads to significant cranial expansion.
- PVDO's frontal improvements may influence the timing and necessity of future frontal surgeries.
Background:
Posterior vault distraction osteogenesis (PVDO) is believed to improve frontal contour in infants with syndromic craniosynostosis and turribrachycephaly. This study provides an objective craniometric analysis to determine how PVDO affects anterior cranial morphology.
Methods:
A retrospective chart review of patients who underwent PVDO was performed. Inclusion criteria included pre- and postoperative computed tomography (CT) scans within 3 months before surgery and another 1 to 6 months after device removal. Volumetric and craniometric data were derived using Mimics software and compared using paired t-test and Wilcoxon rank-sum test.
Results:
About 65 patients underwent PVDO, and 13 patients met inclusion criteria. Mean age at intervention was 3.4 ± 4.2 years. Total cranial volume increased 249 ± 159 cm in all patients (P = 0.0001) and 380 ± 128 cm in patients younger than 1 year of age (n = 6, P =0 .0008). Supraorbital retrusion decreased from 5.44 ± 3.89 to 4.54 ± 3.91 mm postoperatively (P = 0.0004), decreasing significantly in patients without previous frontal surgery and not in those with previous frontal surgery (P = 0.2115; comparison P = 0.0047). Basofrontal angle decreased by 2.92 ± 2.16 degrees (P = 0.0004) with a greater decrease of 3.33±2.68 degrees in those younger than 12 months (P = 0.0289) and 2.58±1.74 degrees in those older (P = 0.0079). No change was found in anterior cranial height and anterofrontal angle (P > 0.05).
Conclusion:
PVDO improves frontal contour by decreasing supraorbital retrusion and reducing frontal bossing in syndromic craniosynostosis patients with turribrachycephaly. When combined with its demonstrated efficacy for cranial expansion, these frontal changes likely reinforce PVDO's ability to influence the timing of, and to a degree, the need for frontal surgery in this group.
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