The relationship between anterior disc displacement and the contour of the articular eminence of the temporomandibular joint

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  • 顎関節円板前方転位と関節隆起形態についての検討　若年顎関節症患者と無症状ボランティアにおける検討
  • 若年顎関節症患者と無症状ボランティアにおける検討

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Some studies show that people with a steep articular eminence of the temporomandibular joint (TMJ) were more likely to have articular disc displacement (DD), while other studies failed to prove this phenomenon. It has also been suggested that flattening of the articular eminence is caused by DD. To resolve this controversy, we studied TMJ MR images obtained from teens, who would not have a long history of DD. The purpose of this study was to evaluate the hypothesis that a steep articular eminence is a predisposing factor for DD. Saggital MR images of 51 TMJs, obtained from 29 patients with TM disorder, and 38 TMJs obtained from 19 asymptomatic volunteers, were used in this study. Three images: lateral, central, and medial, from each joint, were assessed. Cases with any deformity of the disc or condyle were excluded from this study. Morphology of the articular eminence was classified into three types according to Kurita et al. 's classification: box (steep posterior slope of the eminence), sigmoid (S-shaped slope), and flat (shallow eminence) types. The relationship between the types of eminence configuration and the presence of DD was tested using the Chi-square test for 1×m contingency table. In the central and medial images, the box type of configuration was more significantly seen in the TMJs with DD than in the TMJs without DD (p<0.05). We conclude that the configuration of the articular eminence is an important anatomic factor of DD. Moreover, a steep articular eminence would be a predisposing factor for DD.

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