How should the articular disk position be analyzed?

Area of Science:

• Radiology
• Dentistry
• Orthodontics

Background:

• Temporomandibular disorders (TMD) affect disk position.
• Accurate diagnosis of disk displacement is crucial for TMD management.
• Magnetic resonance imaging (MRI) is a key tool for evaluating temporomandibular joint (TMJ) disk position.

Purpose of the Study:

• To compare the accuracy of two MRI methods for determining TMJ disk position.
• Evaluate the reliability of the 12-o'clock position versus the intermediate zone criterion for diagnosing anterior disk displacement.

Main Methods:

• Cross-sectional study involving patients with TMD symptoms.
• Three observers assessed anterior disk displacement using two MRI methods (12-o'clock vs. intermediate zone).
• Comparison with clinical examination findings as the reference standard; intraobserver agreement assessed.

Main Results:

• Method 2 (intermediate zone) showed significantly higher agreement with clinical diagnosis (87.5%) compared to Method 1 (70.0%).
• Method 1 (12-o'clock position) identified a higher percentage of anteriorly displaced disks (52.5%).
• No statistically significant difference was found between clinical diagnosis and Method 2.

Conclusions:

• The intermediate zone criterion is a more reliable method for assessing TMJ disk position on sagittal MRI.
• Clinical diagnosis of disk displacement aligns better with the intermediate zone method.
• Radiologists and clinicians should utilize the intermediate zone criterion for improved diagnostic accuracy.