The instantaneous helical axis of the subtalar and talocrural joints: a non-invasive in vivo dynamic study
The instantaneous helical axis of the subtalar and talocrural joints: a non-invasive in vivo dynamic study
复制标题
DOI：
10.1186/1757-1146-3-13
复制
发表时间：
2010-07-13
影响因子：
2.9
通讯作者：
Sheehan, Frances T.
中科院分区：
文献类型：
--
作者：
Sheehan, Frances T.
背景：了解后足(距小腿和距下关节)运动学对于诊断足部病理、设计全踝关节植入物、治疗后足损伤和量化步态异常至关重要。现有的大多数运动学数据是通过静态身体工作或被动活体研究获得的。这些数据对体内动态情况的适用性尚不清楚。因此，这项研究的目的是在25个健康踝关节中，根据瞬时螺旋轴(IHA)，在需要主动肌肉控制的自愿活动中，完全量化距下、距小腿和跟骨-胫骨的运动学。方法：受试者在1.5T磁共振成像中仰卧，在获得完整的矢状电影相位对比(动态)MRI数据集的同时，重复这种模拟的脚趾抬高。结果：几乎所有在跟骨-胫骨关节量化的运动都归因于距小腿关节。距下IHA的方向和位置高度可变，而距小腿IHA的方向和位置非常一致。结论：IHA能很好地描述距小腿，可以将其建模为固定铰链关节，而距下关节不能。
Background: An understanding of rear-foot (talocrural and subtalar joints) kinematics is critical for diagnosing foot pathologies, designing total ankle implants, treating rear-foot injuries and quantifying gait abnormalities. The majority of kinematic data available have been acquired through static cadaver work or passive in vivo studies. The applicability of these data to dynamic in vivo situations remains unknown. Thus, the purpose of this study was to fully quantify subtalar, talocrural and calcaneal-tibial in vivo kinematics in terms of the instantaneous helical axis (IHA) in twenty-five healthy ankles during a volitional activity that simulated single-leg toe-raises with partial-weight support, requiring active muscle control.Methods: Subjects were each placed supine in a 1.5 T MRI and asked to repeat this simulated toe-raise while a full sagittal-cine-phase contrast (dynamic) MRI dataset was acquired. From the cine-phase contrast velocity a full kinematic description for each joint was derived.Results: Nearly all motion quantified at the calcaneal-tibial joint was attributable to the talocrural joint. The subtalar IHA orientation and position were highly variable; whereas, the talocrural IHA orientation and position were extremely consistent.Conclusion: The talocrural was well described by the IHA and could be modeled as a fixed-hinge joint, whereas the subtalar could not be.