The APERT Severity Scale: A Quantitative Tool for Risk Stratification in Apert Syndrome.

Area of Science:

• Medical Genetics
• Pediatric Surgery
• Craniomaxillofacial Surgery

Background:

• Apert syndrome is a rare genetic disorder characterized by craniosynostosis, midface hypoplasia, and syndactyly, often stemming from FGFR2 mutations.
• Its multisystemic nature and lack of standardized guidelines present diagnostic and therapeutic challenges.
• A quantitative severity scale is needed for objective risk stratification and personalized care.

Purpose of the Study:

• To introduce and validate a quantitative severity scale for Apert syndrome.
• To establish a tool for objective risk stratification and personalized treatment planning.

Main Methods:

• Retrospective review of Apert syndrome patients treated between 1988 and 2024, with inclusion criteria of age ≥11 years at last follow-up.
• Development of a five-domain severity scale (Airway, Pressure, Eyes, Retrusion, Turribrachycephaly - APERT) based on literature and clinical data.
• Scoring performed using preoperative clinical photographs and documentation.

Main Results:

• 37 patients met inclusion criteria; mean follow-up age was 17.0±5.0 years with an average of 4.4±2.2 craniofacial surgeries.
• The APERT score ranged from 5-15, categorizing patients into mild (5-7), moderate (8-11), and severe (12-15) groups.
• Higher APERT scores strongly correlated with increased surgical frequency (r=0.851, p<0.001), with a score ≥9 predicting ≥6 surgeries with high sensitivity and specificity.

Conclusions:

• The APERT score is the first quantitative classification for Apert syndrome severity.
• The score correlates with phenotypic burden and surgical volume, potentially improving clinical communication and treatment planning.
• This scale offers a valuable tool for risk-based management and institutional comparisons in Apert syndrome care.