Correlation between head shape and volumetric changes following spring-assisted posterior vault expansion

Area of Science:

• Craniofacial Surgery
• Pediatric Neurosurgery
• Medical Imaging Analysis

Background:

• Craniosynostosis and other conditions can lead to abnormal head shapes and increased intracranial pressure (ICP).
• Spring-assisted posterior vault expansion (SA-PVE) is a surgical technique used to correct these deformities.
• Understanding factors influencing SA-PVE outcomes is crucial for optimizing treatment.

Purpose of the Study:

• To determine if different head shapes exhibit varying volumetric changes after SA-PVE.
• To investigate the impact of surgical and morphological parameters on SA-PVE effectiveness.
• To correlate head shape characteristics with changes in intracranial volume (ICV).

Main Methods:

• Statistical shape modeling (SSM) and principal component analysis (PCA) were used to analyze preoperative 3D skull models.
• Intracranial volume (ICV) and cranial index (CI) were calculated pre- and post-surgery.
• Correlations were assessed between ICV changes and parameters like skull bone thickness, age, number of springs, duration, and osteotomy type.

Main Results:

• SA-PVE significantly increased ICV (284.1 cm³ ± 171.6) and decreased CI (-2.9% ± 4.3).
• The primary component of head shape variation strongly correlated with ICV change (ρ = 0.68).
• Thinner skull bones (ρ = -0.60) and younger age at surgery (ρ = -0.60) were significantly associated with greater ICV increases.

Conclusions:

• SA-PVE is effective in increasing ICV and potentially reducing ICP.
• Younger patients with brachycephalic head shapes experience more significant ICV gains.
• Skull bone thickness is a key factor for optimizing ICV increase; surgical parameters like spring number or osteotomy type had less impact.