Analysis of related factors to internal derangement in temporomandibular joint dysfunction patients using magnetic resonance imaging

Background/Aim: The aim of this study was to investigate the related factors to internal derangement in the temporomandibular joint (TMJ) dysfunction patients using magnetic resonance imaging (MRI). Methods: We reviewed the MRI of 60 TMJs that were examined MRI and diagnosed with internal derangement. Characteristics of the patients with internal derangement such as gender, age, TMJ pain, disturbance of mouth opening, and joint effusion were examined. Statistical analyses of each characteristic such as gender, TMJ pain, disturbance of mouth opening, and joint effusion were performed by cross-tabulation. The age difference was analyzed using Mann–Whitney test. The relationships between internal derangement and gender, age, TMJ pain, disturbance of mouth opening, and joint effusion were also analyzed by logistic multivariate regression analysis. Results: The occurrence of internal derangement was different by gender (P = 0.021), and the number was larger on women. The presence of disturbance of mouth opening was significantly larger on disc displacement without reduction compared to that on disc displacement with reduction (P = 0.027). Age, TMJ pain, and joint effusion were not different between disc displacement with reduction and disc displacement without reduction. The result of logistic multivariate regression analysis showed that gender and disturbance of mouth opening were related to the higher risk of internal derangement (P