Ohkubo Mai, Sano Tsukasa, Otonari-Yamamoto Mika, Hayakawa Yoshihiko, Okano Tomohiro, Sakurai Kaoru, Sato Toru, Sugiyama Tetsuya, Ishida Ryo
Department of Dysphagia Rehabilitation and Community Dental Care, Tokyo Dental College, Mihama-ku, Chiba, Japan.
Bull Tokyo Dent Coll. 2009 May;50(2):55-62. doi: 10.2209/tdcpublication.50.55.
Magnetic resonance imaging (MRI) on patients with temporomandibular joint disorders (TMD) has revealed that a decrease and/or increase in signal intensity from retrodiscal tissue, joint effusion (the excessive accumulation of joint fluid) and articular disc displacement are related to TMD. However, the effect of aging on these phenomena has yet to be clarified. This study was carried out to explore the relationship between changes in signal intensity from retrodiscal tissue, joint fluid status and pathological disc conditions in elderly patients with TMD. Twenty patients aged over 60 years were examined. They consisted of one man and 19 women, and ranged between 60 and 79 years in age (mean, 66.0 years). The relationships between decreased signal intensity on proton-density-weighted (PDW) images and increased signal intensity on T2-weighted (T2W) MR images from retrodiscal tissue, joint fluid status and state of articular disc were examined. Joint fluid status was classified into 5 levels by extent of high signal areas in upper and lower articular spaces on T2W images. Disc displacement status was evaluated by PDW images. The Wilcoxon test was applied for the statistical analysis. The group showing increased T2W signal intensities from the retrodiscal tissue consisted of 31 out of 40 joints (77.5%). This group showed a significant difference in comparison with the other groups in which no apparent joint fluid was shown (p<0.05). There were no statistically significant differences among other categories. The results suggest a negative relationship between joint fluid and increased signal intensity from retrodiscal tissue due to reflection of the inflammatory reaction in TM joints.
对颞下颌关节紊乱病（TMD）患者进行的磁共振成像（MRI）显示，盘后组织信号强度降低和/或增加、关节积液（关节液过度积聚）以及关节盘移位与TMD有关。然而，衰老对这些现象的影响尚未明确。本研究旨在探讨老年TMD患者盘后组织信号强度变化、关节液状态与病理性关节盘状况之间的关系。对20名60岁以上的患者进行了检查。他们包括1名男性和19名女性，年龄在60至79岁之间（平均66.0岁）。研究了质子密度加权（PDW）图像上盘后组织信号强度降低与T2加权（T2W）MR图像上信号强度增加、关节液状态和关节盘状态之间的关系。根据T2W图像上上下关节间隙高信号区域的范围，将关节液状态分为5级。通过PDW图像评估关节盘移位状态。采用Wilcoxon检验进行统计分析。40个关节中有31个（77.5%）的盘后组织T2W信号强度增加。与其他未显示明显关节积液的组相比，该组有显著差异（p<0.05）。其他类别之间无统计学显著差异。结果表明，由于颞下颌关节炎症反应的反映，关节积液与盘后组织信号强度增加之间存在负相关关系。
