Duan Pengyun, Ding Xiaohong, Zhang Chuncai
School of Mechanical Engineering, University of Shanghai for Science and Technology, Shanghai 200093, P.R.China;Public Experiment Center, University of Shanghai for Science and Technology, Shanghai 200093, P.R.China.
School of Mechanical Engineering, University of Shanghai for Science and Technology, Shanghai 200093,
Sheng Wu Yi Xue Gong Cheng Xue Za Zhi. 2019 Feb 25;36(1):73-79. doi: 10.7507/1001-5515.201806053.
Internal fixator is usually adopted in the treatment of bone fractures. In order to achieve anatomical reduction and effective fixation of fractures, the placement of internal fixators should comply with the biology force line of the bone and adapt to the specific anatomical morphological characteristics of the cortical bone. In order to investigate the distribution characteristics and formation regularity of biology force line and cortical thickness of human bone, three-dimensional model of proximal femur is established by using three-dimensional reconstruction technique in this paper. The normal physiological stress distribution of proximal femur is obtained by finite element analysis under three kinds of behavior conditions: one-legged stance, abduction and adduction. The structural topology optimization method is applied to simulate the cortex of the proximal femur under the combined action of three kinds of behavior conditions, and the anatomic morphological characteristics of the proximal femur are compared. The distribution trend of biology force line of proximal femur and the characteristics of cortex are analyzed. The results show that the biology force lines of bone structure and the morphological characteristics of cortex depend on the load of human activities. The distribution trend of biology force line is related to the direction of trabecular bone and the ridge trend and firmness of cortex when bone is loaded physiologically. The proposed analytical method provides a solution to determine the biology force line of bone and the distribution characteristics of cortex. The conclusions obtained may guide the reasonable placement of internal fixator components of fracture.
骨折治疗通常采用内固定器。为实现骨折的解剖复位和有效固定，内固定器的放置应符合骨骼的生物力学力线，并适应皮质骨的特定解剖形态特征。为研究人体骨骼生物力学力线及皮质厚度的分布特征和形成规律，本文利用三维重建技术建立了股骨近端三维模型。通过有限元分析，在单腿站立、外展和内收三种行为条件下获得了股骨近端的正常生理应力分布。应用结构拓扑优化方法模拟三种行为条件共同作用下的股骨近端皮质，并比较股骨近端的解剖形态特征。分析了股骨近端生物力学力线的分布趋势及皮质特征。结果表明，骨结构的生物力学力线和皮质形态特征取决于人体活动负荷。生理负荷时，生物力学力线的分布趋势与骨小梁方向以及皮质的嵴走向和坚固程度有关。所提出的分析方法为确定骨骼生物力学力线及皮质分布特征提供了解决方案。所得结论可为骨折内固定器部件的合理放置提供指导。
