Mechanics of the ankle and subtalar joints revealed through a 3D quasi-static stress MRI technique
Mechanics of the ankle and subtalar joints revealed through a 3D quasi-static stress MRI technique
复制标题
DOI：
10.1016/j.jbiomech.2004.03.036
复制
发表时间：
2005-03-01
影响因子：
2.4
通讯作者：
Roach, N
中科院分区：
文献类型：
--
作者：
Siegler, S;Udupa, JK;Roach, N
描述了一种在体内和体外研究踝关节和距下关节的三维(313)力学特性的技术。这项技术使用与磁共振扫描仪兼容的3D定位和加载链接，在足部扫描时为后足加载精确的载荷。3D图像处理算法被用来从获取的MR图像中得出骨骼形态、后足结构和关节运动学。该技术被用来在体外和体内研究这些特性。评估了踝关节和细微关节的运动，以及在反转负荷和前抽屉负荷下产生的结构变化。该技术被证明提供了可靠的骨形态测量方法。从左到右的骨形态变异不到5%。从左到右的后足结构参数从左到右的变化不到10%，而且这些特性仅受内翻和前抽屉负荷的轻微影响。内翻和前抽屉负荷在踝关节和距下关节都产生了运动。此外，在踝关节和距下关节观察到高度耦合，主要是内旋和内翻。反转和前抽屉负荷所产生的体外运动大于体内运动。最后，直接通过踝关节复合体测量的外部运动对负荷的响应比通过3D应力MRI技术测量的骨骼运动要大得多，这表明软组织和皮肤干扰的显著影响。(C)2004爱思唯尔有限公司。保留所有权利。
A technique to study the three-dimensional (313) mechanical characteristics of the ankle and of the subtalar joints in vivo and in vitro is described. The technique uses an MR scanner compatible 3D positioning and loading linkage to load the hindfoot with precise loads while the foot is being scanned. 3D image processing algorithms are used to derive from the acquired MR images bone morphology, hindfoot architecture, and joint kinematics. The technique was employed to study these properties both in vitro and in vivo. The ankle and subtler joint motion and the changes in architecture produced in response to an inversion load and an anterior drawer load were evaluated. The technique was shown to provide reliable measures of bone morphology. The left-to-right variations in bone morphology were less than 5%. The left-to-right variations in unloaded hindfoot architecture parameters were less than 10%, and these properties were only slightly affected by inversion and anterior drawer loads. Inversion and anterior drawer loads produced motion both at the ankle and at the subtalar joint. In addition, high degree of coupling, primarily of internal rotation with inversion, was observed both at the ankle and at the subtalar joint. The in vitro motion produced in response to inversion and anterior drawer load was greater than the in vivo motion. Finally, external motion, measured directly across the ankle complex, produced in response to load was much greater than the bone movements measured through the 3D stress MRI technique indicating the significant effect of soft tissue and skin interference. (C) 2004 Elsevier Ltd. All rights reserved.