Accuracy and Reliability of Marker-Based Approaches to Scale the Pelvis, Thigh, and Shank Segments in Musculoskeletal Models
Accuracy and Reliability of Marker-Based Approaches to Scale the Pelvis, Thigh, and Shank Segments in Musculoskeletal Models
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DOI：
10.1123/jab.2016-0282
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发表时间：
2017-10-01
影响因子：
1.4
通讯作者：
Carty, Christopher P.
中科院分区：
文献类型：
--
作者：
Kainz, Hans;Hoang, Hoa X.;Carty, Christopher P.
步态分析与肌肉骨骼建模一起广泛用于研究。在没有医学图像的情况下，表面标记位置用于将通用模型缩放到个人的人体测量学。尚未进行评估儿科和/或临床人群中不同缩放方法的准确性和可靠性的研究，因此构成了本研究的目的。磁共振图像 (MRI) 和动作捕捉数据收集自 12 名脑瘫参与者和 6 名发育正常的参与者。通过将缩放模型的分段测量值与相应的 MRI 测量值进行比较来评估准确性，而通过将缩放模型的分段与来自第一和第二运动捕捉会话的实验标记位置进行比较来评估可靠性。与单独使用标记进行缩放相比，将关节中心纳入缩放过程显着提高了大腿和小腿段长度估计的准确性。与 MRI 测量相比，包括骨盆深度测量在内的骨盆缩放方法导致的误差最高。缩放方法之间的可靠性相似，平均 ICC 为 0.97。骨盆应使用骨盆宽度和高度进行缩放，大腿和小腿段应使用近端和远端关节中心进行缩放。
Gait analysis together with musculoskeletal modeling is widely used for research. In the absence of medical images, surface marker locations are used to scale a generic model to the individual's anthropometry. Studies evaluating the accuracy and reliability of different scaling approaches in a pediatric and/or clinical population have not yet been conducted and, therefore, formed the aim of this study. Magnetic resonance images (MRI) and motion capture data were collected from 12 participants with cerebral palsy and 6 typically developed participants. Accuracy was assessed by comparing the scaled model's segment measures to the corresponding MRI measures, whereas reliability was assessed by comparing the model's segments scaled with the experimental marker locations from the first and second motion capture session. The inclusion of joint centers into the scaling process significantly increased the accuracy of thigh and shank segment length estimates compared to scaling with markers alone. Pelvis scaling approaches which included the pelvis depth measure led to the highest errors compared to the MRI measures. Reliability was similar between scaling approaches with mean ICC of 0.97. The pelvis should be scaled using pelvic width and height and the thigh and shank segment should be scaled using the proximal and distal joint centers.