Videogrammetry is commonly used to record upper limb motions. However, it cannot track the glenohumeral joint center (GH). GH is required to reconstruct upper limb motions. Therefore, it is often estimated by separately measuring scapular motions using scapular kinematics measurements devices (SKMD). Applications of SKMD are neither straightforward nor always noninvasive. Therefore, this work investigates the feasibility of an alternative method to estimate GH from videogrammetry using a CT/MRI image of subject's glenohumeral joint and without requiring SKMD. In order to evaluate the method's accuracy, its GH estimations were compared to reference GH trajectories. The method was also applied to estimate scapular configurations and reconstruct an abduction motion measured by videogrammetry. The accuracy of GH estimations were within 5 mm, and the reconstructed motion was in good agreement with reported in vivo measurements.

中文翻译：

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从患者的视频测量测量和 CT/MRI 估计盂肱关节中心的替代方法的可行性

视频测量法通常用于记录上肢运动。但是，它无法跟踪盂肱关节中心 (GH)。需要 GH 来重建上肢运动。因此，通常通过使用肩胛运动学测量设备 (SKMD) 分别测量肩胛运动来估计。SKMD 的应用既不简单也不总是非侵入性的。因此，这项工作调查了使用受试者盂肱关节的 CT/MRI 图像并且不需要 SKMD 从视频测量中估计 GH 的替代方法的可行性。为了评估该方法的准确性，将其 GH 估计与参考 GH 轨迹进行比较。该方法还被应用于估计肩胛骨构造和重建由视频测量法测量的外展运动。GH 估计的准确度在 5 毫米以内，