【摘要】 背景:利用已建立的足部有限元数字模型,仿真模拟碾压工况下足骨的力学分布及损伤。目的:对足部三维有限元数字模型进行模拟碾压伤有限元力学分析,探讨有限元方法进行人足受力与损伤研究的新技术。方法:对1名健康女性志愿者足部(足尖至胫骨远端、腓骨远端在内的所有骨及关节)行螺旋CT扫描,将三维重建软件生成的足部三维数字模型导入有限元软件ANSYS13.0中处理生成有限元模型。对受力面加载100,200,500,1 000 N的压力,模拟压力缓慢作用于足背。经有限元力学计算步骤,对其进行模拟碾压伤有限元生物力学计算分析。结果与结论:(1)计算结果显示在碾压力作用下,随着压力的增加,足骨所产生的应力普遍升高,应力最大值均出现在足跟前内侧;(2)跖骨中应力主要集中在第一、二、三跖骨;(3)在跗骨中的应力主要集中在跗骨与跖骨、各跗骨之间的关节处;(4)随着压力的增加,应力逐渐向跗跖关节内侧集中,内侧楔骨应力较其余跗骨大;(5)经过模拟碾压伤情况下跗跖关节有限元应力分析,得出碾压伤情况下应力最大并集中部位,与临床跗跖关节损伤病人的骨折多发部位一致,间接证实了有限元模型的可靠性,可以为跗跖关节损伤研究提供数字化平台。更多还原

【Abstract】 BACKGROUND: Mechanical distribution and damage of foot bones under rolling condition are simulated by using the established foot finite element digital model. OBJECTIVE: To simulate the crush injury by using the three-dimensional finite element model of foot, and to explore a new technique for studying the stress and damage of human foot by finite element method.METHODS: Foot(bones and joints from toe to distal tibia and distal fibula) of one female volunteer underwent CT scanning. The three-dimensional reconstructed digital model was imported into the ANSYS 13.0 software. The finite element mechanical analysis of simulating crush injury was carried out by setting 100, 200, 500 and 1 000 N of pressure, and solving the test calculation. RESULTS AND CONCLUSION:(1) Under rolling condition, the stress of foot bones was increased with pressure increasing, and the maximum stress occurred on the anteromedial heel.(2) Metatarsal stress mainly concentrated on the first, second and third metatarsuses.(3) Tarsal stress mainly concentrated on the joints between tarsus and metatarsus, and joints between tarsuses.(4) With the pressure increasing, the stress gradually concentrated on the medial side of tarsometatarsal joint. The stress of medial cuneiform bone was larger than the other tarsuses.(5) Finite element stress analysis of tarsometatarsal joint under simulated crush injury shows that the maximum stress and the site of the strain in the case of crush injury is consistent with that of the patients with clinical tarsal injury, and indirectly confirms the reliability of the finite element model, which can provide a digital platform for the study on tarsal and plantar joint damage.更多还原