Ozawa S, Boering G, Kawata T, Tanimoto K, Tanne K
Department of Orthodontics, Hiroshima University School of Dentistry, Japan.
Cranio. 1999 Apr;17(2):93-100. doi: 10.1080/08869634.1999.11746083.
The objective of this study was to investigate condylar position during different degrees of disk displacement. The degree of disk displacement was evaluated on 1.5 Tesla high-field sagittal MR images of 76 joints (48 patients; mean age 19.4 years) and was classified into three grades (1 to 3). To establish condylar position, the anterior, superior and posterior joint spaces were measured on corrected tomograms. The possible relationship between condylar position, indicated by the width of joint space and successive degree of disk displacement, was compared by a one-way factorial ANOVA (p < 0.05). The anterior joint space was significantly larger in grades 1, 2, and 3 disk displacements than in grade 0 pointing to a dorsal condylar position. The posterior joint space was significantly smaller in grades 1 and 2 compared with grade 0. When the degree of the disk displacement becomes severe (i.e., grade 3 disk displacement), the posterior joint space tends to increase to a similar distance as in a normal healthy joint pointing to a more normal condylar position.
本研究的目的是调查不同程度盘移位时髁突的位置。在76个关节（48例患者；平均年龄19.4岁）的1.5特斯拉高场矢状位磁共振成像上评估盘移位程度，并将其分为三个等级（1至3级）。为确定髁突位置，在校正断层图像上测量关节前、上和后间隙。通过单向析因方差分析（p<0.05）比较由关节间隙宽度表示的髁突位置与盘移位连续程度之间的可能关系。1级、2级和3级盘移位时的前关节间隙明显大于0级，表明髁突处于背侧位置。与0级相比，1级和2级的后关节间隙明显更小。当盘移位程度变得严重时（即3级盘移位），后关节间隙倾向于增加到与正常健康关节相似的距离，表明髁突位置更正常。
