Temporal bone trauma effects on auditory anatomical structures in mastoid obliteration

Area of Science:

• Otolaryngology
• Trauma Surgery
• Forensic Pathology

Background:

• Temporal bone fractures are a significant concern in head trauma.
• Open cavity mastoidectomy can alter the structural integrity of the temporal bone.
• Mastoid obliteration aims to restore structure but may impact biomechanical properties.

Purpose of the Study:

• To evaluate temporal bone fracture severity after lateral impact in cadavers.
• To compare bones with open cavity mastoidectomy and obliteration versus intact temporal bones.
• To assess the impact of mastoid surgery on auditory anatomical structures.

Main Methods:

• Study involved 20 cadaveric temporal bones, divided into two groups.
• One group underwent open cavity mastoidectomy and obliteration with heterologous materials.
• Lateral impacts were applied under standardized conditions, with fractures assessed via CT scan.

Main Results:

• External auditory canal fractures were 6x more frequent in the operated group.
• Tympanic bone fractures occurred in 80% of the operated group vs. 10% of controls (p=.005).
• Middle ear fractures occurred in 70% of the operated group vs. 10% of controls (p=.02); otic capsule fractures were exclusive to the operated group.

Conclusions:

• Mastoid obliteration following open cavity mastoidectomy elevates fracture risk.
• Auditory anatomical structures are more vulnerable to injury after this surgical procedure.
• Surgical alteration of the mastoid impacts the biomechanical response to head trauma.