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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。
Objective To explore a method of computer-aided design of radial head prosthesis based on reverse engineering of contralateral three-dimensional digital anatomical structure to provide clinical accurate replacement. Methods One case of bilateral elbow joint was scanned by GE Speed Light 16-slice spiral thin-slice spiral CT, exclusion of radial head disorders, CT dicom data acquisition and Mimics 10.0 software to reconstruct the elbow. After extraction of the left side of the radius of the proximal three-dimensional model of the radial image of the right side of the proximal radius, and then edited and divided into two parts of the head and neck. Mimics10.0 software was used to measure the cervical segment medullary diameter and length parameters to construct the prosthesis stem. The radial head model was imported into Geomagic studio 12 software to simulate thickening of the cartilage and the prosthesis shaft model was introduced into the head-handle body. According to anatomical features virtual assembly head handle components, to achieve the contralateral radial head prosthesis reverse engineering. Results Based on the CT images of the contralateral elbow joint, three-dimensional reconstruction, editing, measurement and reverse engineering were performed with Mimics and Geomagic studio software to realize the design of individual radial head prostheses and the virtual assembly of the headstock components. Conclusion Reverse engineering based on digital anatomy of contralateral radius provides an effective method for the development of individualized radial head prostheses.