Variability of the temporal bone surface's topography: implications for otologic surgery.

Area of Science:

• Neurosurgery
• Anatomy
• Medical Imaging

Background:

• Otologic surgery, including tympanomastoidectomy, is crucial for treating ear conditions.
• Surgeons rely on surface topography of the temporal bone to identify
• safe areas
• to avoid critical structures during dissection.
• Current identification of
• safe areas
• lacks studies correlating surface topography with subsurface anatomy.

Purpose of the Study:

• To investigate the correlation between temporal bone surface topography and subsurface anatomy.
• To determine if pre-operative CT scans can predict subsurface structures.
• To enhance surgical safety in otologic procedures.

Main Methods:

• Utilized a three-step registration process to align 25 temporal bone CT scans with an anatomical atlas.
• Analyzed displacement and angular differences between surface topography and critical structures.
• Quantified depth of critical structures from the skull's surface.

Main Results:

• Identified two regions, suprahelical and posterior temporal bone, with minimal variability between surface and subsurface anatomy.
• Demonstrated a correlation between surface features (distance, angular difference) and subsurface anatomy.
• Results align with existing knowledge of osteogenesis and temporal bone anatomy.

Conclusions:

• The suprahelical and posterior regions of the temporal bone represent reliable
• safe areas
• for otologic surgery.
• Surface topography in these regions accurately predicts subsurface anatomy, reducing surgical risks.
• This study provides a basis for improved intraoperative navigation and safety in ear surgery.