关键词: 计算机辅助设计, 三维术前规划, 楔形截骨术, 桡骨远端, 配准

Abstract: For radial angulation deformity, it is difficult to accurately locate the osteotomy position by manual osteotomy based on experience, thus affecting the effect of surgery. A three-dimensional automatic planning algorithm for radial angulation wedge osteotomy is proposed, which can accurately determine the specific osteotomy position and calculate the best reduction angle. The contralateral radius mirror model with compensation difference was used as the reference template to calculate the bone deformity area, and the distal radius joint was registered based on the weight of the joint anatomical area to create the rotation axis direction vector. The deformity contour curve of the XOZ plane was solved by the cubic spline interpolation method to determine the orientation of the rotation axis. The single-objective optimization algorithm is used to optimize the iteration, calculate the optimal osteotomy location and reduction angle, and automatically generate the preoperative plan of wedge osteotomy. Six cases of radial angulation were selected to compare the registration accuracy of the joint anatomical region with the surgeon's manual osteotomy planning method in three-dimensional space as the experimental control group. The results showed that compared with manual osteotomy and reduction by surgeons, the root mean square error of the registration of the joint anatomical area obtained by this method decreased by 0.09-0.42mm, Compared with automatic planning methods, it can clarify the type of wedge and has higher clinical feasibility, providing an accurate and reliable method for radial angular malformation.

Key words: Computer aided design , Three-dimensional preoperative planning , wedge osteotomy , distal radius , registration