The Comprehensive AOCMF Classification: Skull Base and Cranial Vault Fractures - Level 2 and 3 Tutorial.

Area of Science:

• Orthopedics
• Neurosurgery
• Plastic Surgery

Background:

• The AO Craniomaxillofacial (AOCMF) Classification Group developed a hierarchical system for classifying craniomaxillofacial fractures.
• Existing classifications may lack the detail required for comprehensive fracture assessment.

Purpose of the Study:

• To present the detailed level 2 and level 3 components of the AOCMF classification system.
• To provide a standardized method for describing skull base and cranial vault fractures, including location, morphology, and associated injuries.

Main Methods:

• Description of the hierarchical three-level classification system.
• Detailed explanation of level 2 (fracture location) and level 3 (fracture morphology) for skull base and cranial vault.
• Inclusion of topographic anatomical regions, bone involvement, and fracture characteristics (fragmentation, displacement, bone loss).

Main Results:

• The level 2 system defines topographic boundaries for endocranial (9 regions) and exocranial/cranial vault (bone-based regions) fractures.
• The level 3 system categorizes fractures based on fragmentation, displacement, and bone loss.
• A framework for documenting associated intracranial diagnostic features is proposed.

Conclusions:

• The presented AOCMF classification provides a detailed and hierarchical approach to craniomaxillofacial fractures.
• This system enhances the precision of fracture description and documentation for skull base and cranial vault injuries.
• Standardized classification facilitates improved communication, treatment planning, and research in craniomaxillofacial trauma.