基于健侧三维数字解剖的桡骨头假体逆向工程研究

目的 探讨基于健侧三维数字解剖结构逆向工程个体化计算机辅助设计桡骨头假体的方法以提供临床精确置换。 方法 采用GE Speed Light 16排螺旋CT薄层扫描健康成人1例双侧肘关节，排除桡骨头疾患，获取CT扫描dicom数据导入Mimics10.0软件三维重建肘关节。提取左健侧桡骨近端三维模型经镜像模拟右患侧桡骨近端，再经编辑处理分割为头颈两部分。利用Mimics10.0软件测量颈段髓内径、长度参数构建假体柄。桡骨头模型导入Geomagic studio 12软件模拟软骨加厚处理，导入假体柄模型生成头柄部实体。按解剖特点虚拟组装头柄部件，实现患侧桡骨头假体的逆向工程。 结果 依据健侧肘关节CT影像数据，利用Mimics和Geomagic studio软件，进行三维重建，编辑，测量和反求，可实现个体化桡骨头假体设计和头柄部件的虚拟组装成型。 结论 基于健侧桡骨数字解剖的逆向工程为个体化桡骨头假体的研制提供了一个有效的方法。

The reverse engineering of radial head prosthesis: based on three-dimensional digital anatomy of proximal radius on uninjured side

Objective To study the reverse engineering of radial head prosthesis based on three-dimensional digital anatomy of proximal radius on uninjured side with the technique of computer aided design in order to help the clinical accurate replacement. Methods　The double elbow joints of a healthy adult was thin slice scaned by GE Speed Light 16 CT to obtain the CT dicom data , which were then imported into Mimics10.0 software for reconstruction of the 3D image of the elbow joints. Establish the mirror image of the proximal segment of the radius on the left side which was presumed unjuried. Then edit and cut it into the head and neck sections, configure the stem through measurement of the diameter and length of the neck intermedullary canal. Meanwhile, the head DXF file was imported into Geomagic studio 12 , Finally, the reverse engineering of the radial head prosthesis was finished. Results By 3D reconstruction, edit, measurement and manipulation of the CT image data of the proximal radius on uninjured side in Mimics10.0 and Geomagic studio 12 software can reversely design the individual radial head prosthesis and simulate to make it up. Conclusion Reverse engineering based on three-dimensional digital anatomy of the proximal radius on the uninjured side provides an effective method to produce an individual radial head prosthesis.