First Clinical Medical College, Guangzhou University of Chinese Medicine, Guangzhou, People's Republic of China.
The Third Affiliated Hospital of Guangzhou University of Chinese Medicine, Joint Orthopedics, Guangzhou, People's Republic of China.
J Orthop Surg Res. 2020 Sep 4;15(1):384. doi: 10.1186/s13018-020-01927-9.
The positional distribution and size of the weight-bearing area of the femoral head in the standing position as well as the direct active surface of joint force can directly affect the result of finite element (FE) stress analysis. However, the division of this area was vague, imprecise, and un-individualized in most studies related to separate FE models of the femur. The purpose of this study was to quantify the positional distribution and size of the weight-bearing area of the femoral head in standing position by a set of simple methods, to realize individualized reconstruction of the proximal femur FE model.
Five adult volunteers were recruited for an X-ray and CT examination in the same simulated bipedal standing position with a specialized patented device. We extracted these image data, calculated the 2D weight-bearing area on the X-ray image, reconstructed the 3D model of the proximal femur based on CT data, and registered them to realize the 2D weight-bearing area to 3D transformation as the quantified weight-bearing surface. One of the 3D models of the proximal femur was randomly selected for finite element analysis (FEA), and we defined three different loading surfaces and compared their FEA results.
A total of 10 weight-bearing surfaces in 5 volunteers were constructed, and they were mainly distributed on the dome and anterolateral of the femoral head with a crescent shape, in the range of 1218.63-1,871.06 mm. The results of FEA showed that stress magnitude and distribution in proximal femur FE models among three different loading conditions had significant differences, and the loading case with the quantized weight-bearing area was more in accordance with the physical phenomenon of the hip.
This study confirmed an effective FE modeling method of the proximal femur, which can quantify the weight-bearing area to define a more reasonable load surface setting without increasing the actual modeling difficulty.
在站立位时，股骨头承重区的位置分布和大小以及关节力的直接主动面会直接影响有限元（FE）的应力分析结果。然而，在大多数关于股骨的单独 FE 模型的相关研究中，该区域的划分是模糊的、不精确的和非个体化的。本研究旨在通过一组简单的方法来量化站立位时股骨头承重区的位置分布和大小，实现股骨近端 FE 模型的个体化重建。
招募了 5 名成年志愿者，使用专门的专利设备在相同的模拟双足站立位进行 X 射线和 CT 检查。我们提取了这些图像数据，计算了 X 射线图像上的 2D 承重区，基于 CT 数据重建了股骨近端的 3D 模型，并对其进行了注册，实现了 2D 承重区到 3D 的转换，作为量化的承重面。从 5 名志愿者中随机选择 1 个股骨近端的 3D 模型进行有限元分析（FEA），我们定义了三个不同的加载面并比较了它们的 FEA 结果。
总共构建了 5 名志愿者的 10 个承重面，它们主要分布在股骨头的穹顶和前外侧，呈新月形，范围在 1218.63-1871.06mm 之间。FEA 的结果表明，三种不同加载条件下股骨近端 FE 模型中的应力大小和分布有显著差异，采用量化承重区的加载情况更符合髋关节的物理现象。
本研究证实了一种有效的股骨近端 FE 建模方法，该方法可以量化承重区，定义更合理的加载面设置，而不会增加实际建模的难度。
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