Westesson P L, Larheim T A, Tanaka H
Department of Radiology, University of Rochester School of Medicine and Dentistry, NY, USA.
J Oral Maxillofac Surg. 1998 Nov;56(11):1266-73; discussion 1273-4. doi: 10.1016/s0278-2391(98)90606-1.
The purpose of this study was to describe the imaging characteristics of posterior disc displacement of the temporomandibular joint (TMJ).
The study was based on 35 joints with posterior disc displacement and a control material of bilateral TMJ images of 62 healthy volunteers. The images were analyzed, and criteria for posterior disc displacement were developed.
Posterior disc displacement was characterized by the disc or a major part of the disc being located posterior to the superior prominence of the condyle. Three subcategories of posterior disc displacement could be identified: a thin flat disc, a grossly posteriorly displaced disc, and a perforated disc with a portion of the disc displaced posteriorly. Posterior disc displacement was not seen in any of the asymptomatic volunteers.
Posterior disc displacement of the TMJ is rare but has probably been overlooked in the past because of a lack of well-defined imaging characteristics.
本研究的目的是描述颞下颌关节（TMJ）盘后移位的影像学特征。
该研究基于35个盘后移位的关节以及62名健康志愿者双侧TMJ图像的对照材料。对图像进行分析，并制定盘后移位的标准。
盘后移位的特征是盘或盘的大部分位于髁突上表面突出部的后方。可识别出盘后移位的三个亚类：薄扁平盘、严重向后移位的盘以及部分盘向后移位的穿孔盘。在任何无症状志愿者中均未发现盘后移位。
TMJ盘后移位很少见，但过去可能因缺乏明确的影像学特征而被忽视。
