University of Alberta, Departmentof Mechanical Engineering, Edmonton, Alberta, Canada.
Bone Joint Res. 2014 May 6;3(5):139-45. doi: 10.1302/2046-3758.35.2000264. Print 2014.
The main object of this study was to use a geometric morphometric approach to quantify the left-right symmetry of talus bones.
Analysis was carried out using CT scan images of 11 pairs of intact tali. Two important geometric parameters, volume and surface area, were quantified for left and right talus bones. The geometric shape variations between the right and left talus bones were also measured using deviation analysis. Furthermore, location of asymmetry in the geometric shapes were identified.
Numerical results showed that talus bones are bilaterally symmetrical in nature, and the difference between the surface area of the left and right talus bones was less than 7.5%. Similarly, the difference in the volume of both bones was less than 7.5%. Results of the three-dimensional (3D) deviation analyses demonstrated the mean deviation between left and right talus bones were in the range of -0.74 mm to 0.62 mm. It was observed that in eight of 11 subjects, the deviation in symmetry occurred in regions that are clinically less important during talus surgery.
We conclude that left and right talus bones of intact human ankle joints show a strong degree of symmetry. The results of this study may have significance with respect to talus surgery, and in investigating traumatic talus injury where the geometric shape of the contralateral talus can be used as control. Cite this article: Bone Joint Res 2014;3:139-45.
本研究的主要目的是采用几何形态测量方法定量分析距骨的左右对称性。
对 11 对完整距骨的 CT 扫描图像进行分析。分别对左右距骨的体积和表面积这两个重要的几何参数进行量化。还采用离差分析测量左右距骨之间的几何形状变化。此外，确定了几何形状不对称的位置。
数值结果表明距骨在本质上是双侧对称的，左右距骨的表面积差异小于 7.5%。同样，两骨体积的差异也小于 7.5%。三维（3D）离差分析的结果表明，左右距骨之间的平均离差值在-0.74mm 到 0.62mm 之间。观察到在 11 名受试者中的 8 名中，在距骨手术中临床意义不大的区域出现了对称性的偏差。
我们的结论是，完整踝关节的左右距骨具有很强的对称性。本研究的结果可能对距骨手术具有重要意义，并可用于研究创伤性距骨损伤，此时可以将对侧距骨的几何形状用作对照。
Bone Joint Res 2014;3:139-45.
