Drace J E, Enzmann D R
Department of Diagnostic Radiology and Nuclear Medicine, Stanford University School of Medicine, Calif.
Radiology. 1990 Oct;177(1):67-71. doi: 10.1148/radiology.177.1.2399340.
Fifty temporomandibular joints (TMJs) in 30 asymptomatic volunteers were imaged with a 1.5-T magnetic resonance (MR) imaging system to determine (a) the normal range of meniscus position, (b) the best definition of a normal TMJ and criteria to distinguish it from a TMJ with significant internal derangements, (c) the significance of certain findings such as joint effusion and disk distortion, and (d) the optimum mouth position(s) to be used for imaging. A method was devised to quantify meniscus displacement in terms of the number of degrees from a 12 o'clock or vertical position (relative to the condyle). The distribution of meniscus positions defined two groups in this asymptomatic study group. A strong correlation between abnormal joints and a history of orthodontics led to the exclusion of subjects with a history of orthodontics, and those with mouth trauma were also excluded, leaving a better "normal control" group. The junction of the posterior band of the meniscus and the bilaminar zone should fall within 10 degrees of vertical to be within the 95th percentile of normal.
对30名无症状志愿者的50个颞下颌关节（TMJ）进行了1.5-T磁共振（MR）成像，以确定：（a）半月板位置的正常范围；（b）正常颞下颌关节的最佳定义以及将其与有明显内部紊乱的颞下颌关节区分开来的标准；（c）诸如关节积液和盘状变形等某些发现的意义；（d）用于成像的最佳口腔位置。设计了一种方法，根据相对于髁突从12点或垂直位置起的度数来量化半月板位移。在这个无症状研究组中，半月板位置的分布定义了两组。异常关节与正畸病史之间存在很强的相关性，因此排除了有正畸病史的受试者，也排除了有口腔创伤的受试者，从而留下了一个更好的“正常对照组”。半月板后带与双板区的交界处应在垂直方向10度范围内，才属于正常的第95百分位数。
