摘要
目的 研究正常步态周期下髋臼周围区域应力分布规律,并进一步探究髋臼各柱的生物力线和骨皮质厚薄形态分布。方法 通过人体逆向动力学分析获取人体步态周期8个典型阶段的肌肉及髋关节载荷,应用三维重建技术构建髋关节三维模型,以所得载荷作为加载边界条件进行有限元分析及拓扑优化。结果 步态周期支撑相下髋关节载荷较大,中柱应变能占总应变能55%~69%,髋臼顶部应力较大;摆动相下髋关节载荷减小,中柱应变能所占百分比减小。髋关节不同的运动角度影响肌肉力,进而影响髋关节上应力分布规律。所获得髋臼各柱的生物力线分布与解剖学所提出的生物力线及骨小梁排布基本吻合,与拓扑优化结果中骨皮质较厚区域相对应。结论 通过数值模拟方法可以确定髋臼各柱的生物力线和骨皮质厚薄形态分布,为骨折治疗内固定装置的合理放置提供理论指导。
Objective To study the patterns of stress distributions on the area around the acetabulum during normal gait cycle, and to further explore the distribution of biology force lines of each column of the acetabulum as well as the thickness morphology of cortical bones. Methods The muscle and hip loads under 8 typical phases of human gait cycle were obtained through human reverse dynamics analysis. The three-dimensional(3D) model of hip joint was built by 3D reconstruction technology, and the finite element analysis and topology optimization of cortical bones were conducted by using the obtained loads as loading boundary conditions. Results In support phase, the hip joint load was larger, the strain energy of the middle column accounted for 55%-69% of the total strain energy, and the stress at top of the acetabulum was larger. In swing phase, the hip joint load decreased and the percentage of strain energy in the middle column decreased. Different motion angles of the hip joint affected muscle forces and further affected stress distributions on hip joints. The obtained biology force lines of each column of the acetabulum based on finite element method were basically consistent with biology force lines and bone trabecular arrangement proposed by the anatomy, and corresponded to thicker areas of cortical bones in topology optimization simulation results. Conclusions Biology force lines of each column of the acetabulum and thickness morphology distributions of cortical bones can be determined by numerical simulation, which provides theoretical references for reasonable placement of the internal fixation for fracture treatment.
作者
熊婉樾
丁晓红
段朋云
李嘉成
王攀峰
张春才
XIONG Wanyue;DING Xiaohong;DUAN Pengyun;LI Jiacheng;WANG Panfeng;ZHANG Chuncai(School of Mechanical Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;Emergency Department,Changhai Hospital Affiliated to Naval Military Medical University,Shanghai 200433,China)
出处
《医用生物力学》
CAS
CSCD
北大核心
2022年第6期1076-1082,共7页
Journal of Medical Biomechanics
基金
国家自然科学基金项目(51975380)。
关键词
生物力线
步态周期
有限元模型
拓扑优化
biology force line
gait cycle
finite element model
topology optimization
