Department of Orthopaedic Surgery, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka 565-0871, Japan; Toyonaka Municipal Hospital, 4-14-1 Shibahara, Toyonaka, Osaka 560-8565, Japan.
Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara 630-0192, Japan.
J Biomech. 2019 May 24;89:128-133. doi: 10.1016/j.jbiomech.2019.04.017. Epub 2019 Apr 19.
Measuring three-dimensional (3D) forearm rotational motion is difficult. We aimed to develop and validate a new method for analyzing 3D forearm rotational motion. We proposed biplane fluoroscopic intensity-based 2D-3D matching, which employs automatic registration processing using the evolutionary optimization strategy. Biplane fluoroscopy was conducted for forearm rotation at 12.5 frames per second along with computed tomography (CT) at one static position. An arm phantom was embedded with eight stainless steel spheres (diameter, 1.5 mm), and forearm rotational motion measurements using the proposed method were compared with those using radiostereometric analysis, which is considered the ground truth. As for the time resolution analysis, we measured radiohumeral joint motion in a patient with posterolateral rotatory instability and compared the 2D-3D matching method with the simulated multiple CT method, which uses CTs at multiple positions and interpolates between the positions. Rotation errors of the radius and ulna between these two methods were 0.31 ± 0.35° and 0.32 ± 0.33°, respectively, translation errors were 0.43 ± 0.35 mm and 0.29 ± 0.25 mm, respectively. Although the 2D-3D method could detect joint dislocation, the multiple CT method could not detect quick motion during joint dislocation. The proposed method enabled high temporal- and spatial-resolution motion analyses with low radiation exposure. Moreover, it enabled the detection of a sudden motion, such as joint dislocation, and may contribute to 3D motion analysis, including joint dislocation, which currently cannot be analyzed using conventional methods.
测量三维（3D）前臂旋转运动较为困难。本研究旨在开发和验证一种分析 3D 前臂旋转运动的新方法。我们提出了基于双平面荧光透视强度的 2D-3D 配准方法，该方法采用基于进化优化策略的自动配准处理。在 12.5 帧/秒的速度下进行双平面荧光透视，同时在一个静态位置进行计算机断层扫描（CT）。一个手臂模型中嵌入了八个不锈钢球（直径 1.5mm），使用所提出的方法进行前臂旋转运动测量，并与被认为是基准的放射立体分析进行比较。对于时间分辨率分析，我们测量了患有后外侧旋转不稳定的患者的桡尺关节运动，并将 2D-3D 配准方法与模拟的多 CT 方法进行比较，该方法使用多个位置的 CT 并在这些位置之间进行插值。两种方法的桡骨和尺骨旋转误差分别为 0.31±0.35°和 0.32±0.33°，平移误差分别为 0.43±0.35mm 和 0.29±0.25mm。虽然 2D-3D 方法可以检测关节脱位，但多 CT 方法无法检测关节脱位期间的快速运动。所提出的方法能够以低辐射暴露实现高时间和空间分辨率的运动分析。此外，它能够检测到突然运动，例如关节脱位，并且可能有助于 3D 运动分析，包括目前无法使用常规方法分析的关节脱位。
