The mandible injury severity score: development and validity.

Area of Science:

• Oral and Maxillofacial Surgery
• Trauma Surgery
• Medical Informatics

Background:

• Mandible fractures present complex injury patterns.
• Objective quantification of mandible injury severity is crucial for treatment planning and outcome prediction.
• Existing methods for describing mandible injuries can be subjective and lack standardization.

Purpose of the Study:

• To develop and validate a clinical method for characterizing and scoring mandible injury severity.
• To introduce the FLOSID taxonomy and the UCLA Mandible Injury Severity Score (MISS).

Main Methods:

• Developed the FLOSID taxonomy incorporating fracture type, location, occlusion, soft tissue involvement, infection, and displacement.
• Assigned empirical weights to FLOSID components to create the MISS.
• Calculated MISS for 336 patients with mandible fractures.
• Validated the MISS by correlating it with treatment modality and clinical outcomes.

Main Results:

• All FLOSID components significantly correlated with the MISS (P < .001).
• The MISS showed significant associations with sensory nerve deficit, hospitalization, and pain at 1 month (P < .001).
• No correlation was found between the MISS and unrelated variables like ethnicity, education, or gender.
• Patients treated with rigid internal fixation had higher MISS scores than those treated with maxillomandibular fixation (P < .001).

Conclusions:

• The FLOSID taxonomy provides a structured alternative to narrative descriptions of mandible injuries.
• The UCLA Mandible Injury Severity Score (MISS) is a valid and readily derivable index of mandible injury severity.
• The MISS appears to be a reliable measure across key clinical domains.