距下关节三维运动测量方法学比较

目的: 探讨测量距下关节三维运动的简便、有效方法,为临床研究距下关节的运动及其损伤提供新的思路.方法: 选用青壮年新鲜小腿-足标本8个,以机械方法测量跟骨在笛卡尔坐标系内的三维位移,通过矩阵转换和函数方程,利用位移计算距下关节的三维运动角度.此外,在后足运动的极限位置对标本行螺旋CT扫描,三维重建,分析距下关节各平面活动范围.比较两种测量结果.结果: 两种方法测量距下关节水平面、冠状面运动,结果无显著性差异.结论: 机械测量较简便、经济,且精度较高;而影像学测量存在较大的观察误差,但作为一种无创的检查方法,有必要进行深入的研究.

Comparison of Two Methods in Evaluating the Subtalar Joint Motion

Objective To understand the characteristics of subtalar joint motion and to probe a new method in evaluating the subtalar joint. Methods Eight fresh frozen adult shank-foot specimens with calcaneus marked were placed in a Cartesian coordinate system. The motion of the subtalar joint was obtained through matrix translation and Euler equation. Comparatively, the same specimens were underwent CT scan and established three dimensional reconstruction through the radiographic method. Results Both the mechanical and the radiographic methods had no significant difference in reflecting the motion of subtalar joint in coronal and transversal plane. Conclusion To evaluate the motion of subtalar joint with mechanical method was more precise, economic and easier to perform. Although the radiographic method had considerable discrepancy among examiners, as a non-invasion examination, it needs further research.