Cranial base changes following coronal suturectomy in craniosynostotic rabbits

Area of Science:

• Craniofacial surgery
• Developmental biology
• Animal models

Background:

• Craniosynostosis involves premature fusion of cranial sutures.
• Surgical intervention aims to correct associated cranial base abnormalities.
• The efficacy of early surgical release in familial coronal suture synostosis (CSS) requires further investigation.

Purpose of the Study:

• To evaluate the impact of surgical suturectomy on cranial base development in a rabbit model of familial coronal suture synostosis (CSS).

Main Methods:

• 56 New Zealand White rabbits were studied: 32 controls, 11 with unoperated CSS, and 13 with CSS treated by suturectomy at 25 days.
• Serial radiographs were analyzed at 25, 42, and 84 days.
• Cranial base measurements (linear, angular, shape) were compared using ANOVA and tensor biometric analysis.

Main Results:

• CSS rabbits exhibited significantly different anterior/total cranial base lengths, flatter angles, and dysmorphic shapes compared to controls.
• Suturectomy showed limited impact, with significant differences only in palatal/cranial base angles and posterior cranial base shape between operated and unoperated CSS rabbits.
• Postoperative changes in operated rabbits included altered posterior/total cranial base lengths and anterior/posterior cranial base shapes.

Conclusions:

• Surgical release of synostosed coronal sutures via suturectomy did not normalize cranial base growth in this rabbit model.
• Potential reasons include late surgical timing, resynostosis, or primary malformations not amenable to surgical correction.