【摘要】 目的　建立一种更接近人体骨性髋臼关节面的三维模型。方法　通过三维激光扫描获取髋臼的点云数据 ,分别用球面和旋转椭球面逐步逼近骨性髋臼关节面 ,建立球面和旋转椭球面的二种参数化匹配模型 ,并对二种模型参数与匹配误差作统计学分析。结果　旋转椭球面模型的匹配误差显著小于球面模型的匹配误差 ,旋转椭球面模型的长、短轴与球面模型的半径有较强的相关性。结论　旋转椭球面模型较之传统的球面模型更接近人体骨性髋臼的几何形态更多还原

【Abstract】 Objective To establish the 3D geometric model with a better fit for human acetabular joint surface. Methods Acetabulum 3D point data was acquired by the 3D laser surface scanner. Two kinds of parameterized 3D model, a spherical model and a rotating elliptical model, were built by means of a spherical surface and a rotating elliptical surface approaching to the acetabulum bone joint surface, respectively. The parameters of two models as well as fitting errors were statisticly analyzed. Results The fitting error of the rotating elliptical model was significantly less than that of the spherical model (P<0.001). The semi major and semi minor axis of ellipsoid model was positively correlated with the radius of sphere model. Conclusion The rotating elliptical model had a better fit for human acetabular bone joint surface than the spherical model.更多还原