Otero María Florinda, Tahoces Pablo G, Mera Antonio, Dalstra Michel, Verna Carlalberta, Pedersen Thomas Klit, Herlin Troels, Mira Jorge
Health Research Institute of Santiago de Compostela (IDIS), Santiago de Compostela, Spain.
Departamento de Electrónica e Computación, Universidade de Santiago de Compostela, Santiago de Compostela, Spain.
Orthod Craniofac Res. 2024 Apr;27(2):203-210. doi: 10.1111/ocr.12702. Epub 2023 Aug 1.
To describe a method to calculate the total intra-articular volume (inter-osseous space) of the temporomandibular joint (TMJ) determined by cone-beam computed tomography (CBCT). This could be used as a marker of tissue proliferation and different degrees of soft tissue hyperplasia in juvenile idiopathic arthritis (JIA) patients.
Axial single-slice CBCT images of cross-sections of the TMJs of 11 JIA patients and 11 controls were employed. From the top of the glenoid fossa, in the caudal direction, an average of 26 slices were defined in each joint (N = 44). The interosseous space was manually delimited from each slice by using dedicated software that includes a graphic interface. TMJ volumes were calculated by adding the areas measured in each slice. Two volumes were defined: V and V , where V is the inter-osseous space, volume defined by the borders of the fossa and V is the internal volume defined by the condyle. An intra-articular volume filling index (IF) was defined as V /V , which represents the filling of the space.
The measured space of the intra-articular volume, corresponding to the intra-articular soft tissue and synovial fluid, was more than twice as large in the JIA group as in the control group.
The presented method, based on CBCT, is feasible for assessing inter-osseus joint volume of the TMJ and delimits a threshold of intra-articular changes related to intra-articular soft tissue proliferation, based on differences in volumes. Intra-articular soft tissue is found to be enlarged in JIA patients.
描述一种通过锥形束计算机断层扫描（CBCT）计算颞下颌关节（TMJ）关节内总体积（骨间间隙）的方法。这可作为幼年特发性关节炎（JIA）患者组织增殖和不同程度软组织增生的标志物。
采用11例JIA患者和11例对照者TMJ横断面的轴向单层CBCT图像。从关节窝顶部开始，沿尾侧方向，每个关节平均定义26层（N = 44）。使用包含图形界面的专用软件从每层手动划定骨间间隙。通过将每层测量的面积相加来计算TMJ体积。定义了两个体积：V和V ，其中V是骨间间隙，即由关节窝边界定义的体积，V是由髁突定义的内部体积。关节内体积填充指数（IF）定义为V /V ，它代表了空间的填充情况。
JIA组关节内体积的测量值，对应于关节内软组织和滑液，是对照组的两倍多。
基于CBCT提出的方法对于评估TMJ的骨间关节体积是可行的，并且基于体积差异划定了与关节内软组织增殖相关的关节内变化阈值。发现JIA患者的关节内软组织增大。
