Simulated Injuries of the Sheep Ossicular Chain: Correlations With Their Radiological Images.

Area of Science:

• Otorhinolaryngology
• Radiology
• Anatomical Pathology

Background:

• Assessing subtle ossicular trauma is challenging due to the small size of middle ear structures.
• Radiological and clinical correlations of ossicular injuries are not well-documented.
• A suitable animal model is needed for detailed study.

Purpose of the Study:

• To evaluate the sheep temporal bone as a model for studying simulated middle ear injuries.
• To correlate radiological findings with simulated ossicular chain injuries.
• To assess the effectiveness of post-processing techniques for visualizing ossicular structures.

Main Methods:

• Simulated common traumatic ossicular chain injuries in sheep temporal bones.
• Acquired high-resolution computed tomography (HRCT) images.
• Measured dislocations using calipers and analyzed images with multiplanar reconstructions (MPRs) and maximum intensity projections (MIPs).

Main Results:

• Optimal visualization planes for sheep middle ear joints were achieved.
• Maximum intensity projections (MIPs) showed a 40% coincidence with simulated ossicular injuries.
• Most ossicular chain structures were clearly visualized, though stapes footplate and incudostapedial joint evaluation presented challenges.

Conclusions:

• The sheep temporal bone is a suitable model for investigating the relationship between pathological changes and radiological appearances of the ossicular chain.
• The MIP technique offers a more accurate and simpler method for diagnosing traumatic ossicular chain injuries compared to MPRs alone.