摘要：目的 通过建立股骨近端有限元模型，分析在坐立转换站立阶段初期，股骨近端在自选速度起立和快速起立条件下的损伤风险。方法 将老年人股骨近端CT影像三维重建、逆向建模完成实体模型。通过材料赋值和网格划分建立有限元模型，基于有限元分析软件ANSYS，通过边界条件约束，并加载1733N与1837N的载荷得到不同起立速度下股骨近端的应力分布和应变数据。结果 应力集中区域均为大转子内侧边缘和股骨颈。应力和微应变峰值出现在大转子内侧边缘，快速起立情境下应力峰值为30.16MPa，微应变峰值为2553.5；自选速度起立峰值较低，为28.69MPa和2430.4。对于股骨颈应力集中区，快速起立应力范围为13.42MPa到23.46MPa，自选速度起立应力范围为12.76MPa到25.51MPa。结论 频繁的坐立转换会使老年人股骨近端有疲劳性骨折的风险；快速起立坐立转换比自选速度起立坐立转换对股骨近端有着更高的损伤风险。
Abstract: Objective To establish a finite element model of the proximal femur to analyze the risk of injury of the proximal femur under the conditions of optional speed and rapid rise during the initial stage of sitting-to-stand conversion. Methods The three-dimensional reconstruction and reverse modeling of the CT image of the proximal femur of the elderly complete the solid model. The finite element model is established through material assignment and meshing. Based on the finite element analysis software ANSYS, the boundary conditions are constrained, and loads of 1733N and 1837N are applied to obtain the stress distribution and strain data of the proximal femur at different rising speeds.Results The areas of stress concentration were both the medial edge of the greater trochanter and the femoral neck. The peak stress and micro-strain appear on the inner edge of the larger rotor. The peak stress is 30.16 MPa and the micro-strain peak is 2553.5 in the rapid standing situation; the peak of self-selected speed is lower, 28.69 MPa and 2430.4. For the stress concentration area of the femoral neck, the rapid rise stress range is 13.42MPa to 23.46MPa, and the self-selected speed rise stress range is 12.76MPa to 25.51MPa. Conclusions Frequent sit-to-stand transitions may increase the risk of fatigue fractures of the proximal femur in the elderly; rapid-to-stand transitions have a higher risk of injury to the proximal femur than the self-selected speed to stand-to-stand transitions.