Macready Dawn M, Hecht Silke, Craig Linden E, Conklin Gordon A
Department of Small Animal Clinical Sciences, University of Tennessee College of Veterinary Medicine, Knoxville, TN 37996, USA.
Vet Radiol Ultrasound. 2010 Jul-Aug;51(4):436-40. doi: 10.1111/j.1740-8261.2010.01680.x.
Evaluation of the canine temporomandibular joint (TMJ) is important in the clinical diagnosis of animals presenting with dysphagia, malocclusion and jaw pain. In humans, magnetic resonance imaging (MRI) is the modality of choice for evaluation of the TMJ. The objectives of this study were to establish a technical protocol for performing MRI of the canine TMJ and describe the MRI anatomy and appearance of the normal canine TMJ. Ten dogs (one fresh cadaver and nine healthy live dogs) were imaged. MRIs were compared with cadaveric tissue sections. T1-weighted (T1-W) transverse closed-mouth, T1-W sagittal closed-mouth, T1-W sagittal open-mouth, and T2-W sagittal open-mouth sequences were obtained. The condylar process of the mandible and the mandibular fossa of the temporal bone were hyperintense to muscle and isointense to hypointense to fat on T1-W images, mildly hyperintense to muscle on T2-W images, and were frequently heterogeneous. The articular disc was visible in 14/20 (70%) TMJs on T1-W images and 13/20 (65%) TMJs on T2-W images. The articular disc was isointense to hyperintense to muscle on T1-W images and varied from hypointense to hyperintense to muscle on T2-W images. The lateral collateral ligament was not identified in any joint. MRI allows evaluation of the osseous and certain soft tissue structures of the TMJ in dogs.
评估犬颞下颌关节（TMJ）对于诊断出现吞咽困难、错牙合和颌部疼痛的动物具有重要意义。在人类中，磁共振成像（MRI）是评估颞下颌关节的首选方式。本研究的目的是建立犬颞下颌关节MRI检查的技术方案，并描述正常犬颞下颌关节的MRI解剖结构和表现。对10只犬（1只新鲜尸体犬和9只健康活体犬）进行了成像。将MRI图像与尸体组织切片进行比较。获取了T1加权（T1-W）横向闭口位、T1-W矢状位闭口位、T1-W矢状位开口位和T2-W矢状位开口位序列图像。在T1-W图像上，下颌骨髁突和颞骨下颌窝相对于肌肉呈高信号，相对于脂肪呈等信号至高信号；在T2-W图像上，相对于肌肉呈轻度高信号，且常表现为不均匀信号。在T1-W图像上，20个颞下颌关节中有14个（70%）可见关节盘，在T2-W图像上，20个颞下颌关节中有13个（65%）可见关节盘。在T1-W图像上，关节盘相对于肌肉呈等信号至高信号，在T2-W图像上，相对于肌肉信号强度从低信号到高信号不等。在任何关节中均未识别出外侧副韧带。MRI能够评估犬颞下颌关节的骨性结构和某些软组织结构。
