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首页> 外文期刊>Journal of Foot and Ankle Research >Direct assessment of 3D foot bone kinematics using biplanar X-ray fluoroscopy and an automatic model registration method
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Direct assessment of 3D foot bone kinematics using biplanar X-ray fluoroscopy and an automatic model registration method

机译：使用双平面X射线荧光透视法和自动模型注册方法直接评估3D足部骨骼运动学

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Background Quantifying detailed 3-dimensional (3D) kinematics of the foot in contact with the ground during locomotion is crucial for understanding the biomechanical functions of the complex musculoskeletal structure of the foot. Biplanar X-ray fluoroscopic systems and model-based registration techniques have recently been employed to capture and visualise 3D foot bone movements in vivo, but such techniques have generally been performed manually. In the present study, we developed an automatic model-registration method with biplanar fluoroscopy for accurate measurement of 3D movements of the skeletal foot. Methods Three-dimensional surface models of foot bones were generated prior to motion measurement based on computed tomography. The bone models generated were then registered to biplanar fluoroscopic images in a frame-by-frame manner using an optimisation technique, to maximise similarity measures between occluding contours of the bone surface models with edge-enhanced fluoroscopic images, while avoiding mutual penetration of bones. A template-matching method was also introduced to estimate the amount of bone translation and rotation prior to automatic registration. Results We analysed 3D skeletal movements of a cadaver foot mobilized by a robotic gait simulator. The 3D kinematics of the calcaneus, talus, navicular and cuboid in the stance phase of the gait were successfully reconstructed and quantified using the proposed model-registration method. The accuracy of bone registration was evaluated as 0.27?±?0.19 mm and 0.24?±?0.19° (mean?±?standard deviation) in translation and rotation, respectively, under static conditions, and 0.36?±?0.19 mm and 0.42?±?0.30° in translation and rotation, respectively, under dynamic conditions. Conclusions The measurement was confirmed to be sufficiently accurate for actual analysis of foot kinematics. The proposed method may serve as an effective tool for understanding the biomechanical function of the human foot during locomotion.
机译：背景技术量化运动过程中与地面接触的脚部的详细3维（3D）运动学，对于理解脚部复杂的肌肉骨骼结构的生物力学功能至关重要。最近已采用双平面X射线荧光透视系统和基于模型的配准技术来捕获和可视化体内3D足部骨骼的运动，但是这种技术通常是手动执行的。在本研究中，我们开发了一种具有双平面荧光检查法的自动模型注册方法，用于准确测量骨骼足的3D运动。方法在基于计算机断层扫描的运动测量之前，先生成脚骨骼的三维表面模型。然后使用优化技术以逐帧方式将生成的骨骼模型配准到双平面透视图像，以在用边缘增强的透视图像封闭骨骼表面模型轮廓之间的相似性度量最大化，同时避免骨骼相互渗透。还引入了模板匹配方法来估计自动配准之前的骨平移和旋转量。结果我们分析了由机器人步态模拟器动员的尸体脚的3D骨骼运动。使用拟议的模型注册方法，成功地重建并量化了步态姿态相的跟骨，距骨，航海和长方体的3D运动学。在静态条件下，平移和旋转的骨定位精度分别为0.27±0.19mm和0.24±0.19°（平均标准偏差），以及0.36±0.19mm和0.42mm。在动态条件下，平移和旋转分别为±0.30°。结论该测量被证实对于足部运动学的实际分析是足够准确的。所提出的方法可以作为了解运动过程中人脚的生物力学功能的有效工具。

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