Purpose: The purpose of this study was to investigate whether the clinical finding of anterior disc displacement without reduction (ADWOR) and pain in the temporomandibular joint (TMJ) is correlated to the magnetic resonance imaging (MRI) findings of TMJ internal derangement (ID).
Patients And Methods: The TMJ group was composed of 55 TMJ pain patients who were assigned a clinical diagnosis of unilateral ADWOR. The control group consisted of 58 nonpainful TMJ patients. Sagittal and coronal MR images were obtained to establish the incidence and type of ID.
Results: Using chi-square analysis, the results showed a significant relationship between the presence of pain and the MRI diagnosis of ID (P =.000) and its type (P =.000). Use of the kappa statistical test indicated poor diagnostic agreement between the presence of pain and the MRI diagnosis of ID (kappa = 0.37) and disc displacement with reduction (kappa = 0.20). The diagnostic agreement for disc displacement without reduction was 78.8%, with a corresponding kappa-value of 0.58, indicating fair agreement between the clinical and the MRI diagnosis.
Conclusion: The results suggest that TMJ pain associated with ADWOR is correlated with MRI diagnoses of ID and the ID type. These data confirm the use of the clinical diagnostic criteria for disc displacement without reduction as a reliable method of predicting similar MRI diagnoses.
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