Three-dimensional Quantification of Femoral Head Shape in Controls and Patients with Cam-type Femoroacetabular Impingement
Three-dimensional Quantification of Femoral Head Shape in Controls and Patients with Cam-type Femoroacetabular Impingement
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DOI：
10.1007/s10439-013-0762-1
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发表时间：
2013-06-01
影响因子：
3.8
通讯作者：
Anderson, Andrew E.
中科院分区：
文献类型：
--
作者：
Harris, Michael D.;Reese, Shawn P.;Anderson, Andrew E.
本文提出了一种客观测量股骨头三维形态的方法，并应用于正常人和凸轮型股骨髋臼撞击（FAI）患者。3D重建由15个凸轮和15个对照股骨的高分辨率CT图像制成。股骨头适合于由旋转贝壳状体和球体组成的理想几何形状。量化了自体股骨头和理想形状之间的几何相似性。测量自体股骨头突出理想形态以上的最大距离和突出面积。对于两组，贝壳状体与自体股骨头几何结构的拟合度明显优于球体。凸轮型FAI股骨分别与球体或贝壳拟合时，其最大偏差（4.99 +/- A 0.39 mm和4.08 +/- A 0.37 mm）显著大于对照组（2.41 +/- A 0.31 mm和1.75 +/- A 0.30 mm）。当使用0.1 mm（对于球体）和0.01 mm（对于贝壳状体）的较低阈值来定义突出时，对照组中突出超过理想形状的自体股骨头面积显著更大。本文所述的3D测量技术可以在凸轮型FAI的诊断中补充射线照片的测量。正常股骨与理想形状的偏差可达2.5 mm，而4-5 mm的偏差是凸轮型FAI的特征。
An objective measurement technique to quantify 3D femoral head shape was developed and applied to normal subjects and patients with cam-type femoroacetabular impingement (FAI). 3D reconstructions were made from high-resolution CT images of 15 cam and 15 control femurs. Femoral heads were fit to ideal geometries consisting of rotational conchoids and spheres. Geometric similarity between native femoral heads and ideal shapes was quantified. The maximum distance native femoral heads protruded above ideal shapes and the protrusion area were measured. Conchoids provided a significantly better fit to native femoral head geometry than spheres for both groups. Cam-type FAI femurs had significantly greater maximum deviations (4.99 +/- A 0.39 mm and 4.08 +/- A 0.37 mm) than controls (2.41 +/- A 0.31 mm and 1.75 +/- A 0.30 mm) when fit to spheres or conchoids, respectively. The area of native femoral heads protruding above ideal shapes was significantly larger in controls when a lower threshold of 0.1 mm (for spheres) and 0.01 mm (for conchoids) was used to define a protrusion. The 3D measurement technique described herein could supplement measurements of radiographs in the diagnosis of cam-type FAI. Deviations up to 2.5 mm from ideal shapes can be expected in normal femurs while deviations of 4-5 mm are characteristic of cam-type FAI.