股骨头部分置换术精准微创治疗中老年ARCO Ⅲ期股骨头缺血坏死的有限元分析

目的通过有限元分析，初步评估股骨头部分置换术后股骨与内植物模型的应力分布和位移。 方法选择一名成年健康志愿者，获取股骨全长CT扫描数据，利用Mimics 20.0软件、Geomagic软件及UG NX 12.0软件建立股骨头缺血坏死模型，骨隧道切除股骨头坏死区域后装配设计开发的股骨头假体，模拟单腿站立环境进行有限元仿真模拟，获取股骨与内植物模型的应力分布和位移数据。 结果股骨应力分布主要集中在股骨颈下方和股骨干皮质骨两侧，最大应力为48.25 Mpa，最大位移为10.98 mm。内植物模型的应力主要分布在金属内植物主体结构下方，最大应力为147.2 Mpa，最大位移为9.58 mm。 结论股骨头部分置换后，假体头与股骨头曲率一致，应力传导模式与正常侧髋关节一致，但在假体头与茎部连接处发生应力集中，应重点考虑选择更大强度的材料。

Partial femoral head replacement for precise minimally invasive treatment of ARCO Ⅲ femoral bone necrosis in middle-age and elderly patients: finite element analysis

ObjectiveTo evaluate the stress distribution and displacement of femoral and implant models after partial femoral head replacement by finite element analysis. MethodsA healthy adult volunteer was selected to obtain the full-length CT scan data of femur. Mimics 20.0 software, Geomagic software and UG NX 12.0 software were used to establish the model of femoral head ischemic necrosis. The femoral head prosthesis was designed and developed after bone tunnel resection. The finite element simulation was conducted to simulate the one-leg standing environment, and the stress distribution and displacement data of the femur and the implant model were obtained. ResultsThe femoral stress distribution mainly concentrated on the lower part of the femoral neck and both sides of the femoral shaft cortical bone, the maximum stress was 48.25 Mpa, the maximum displacement was 10.98mm. The stress of the implant model was mainly distributed under the main structure of the metal implant, with a maximum stress of 147.2 Mpa and a maximum displacement of 9.58mm. ConclusionsAfter partial replacement of femoral head, the curvature of prosthetic head and femoral head is the same, and the stress conduction mode is the same as that of normal hip joint. However, stress concentration occurs at the joint between prosthetic head and stem, and the choice of materials with higher strength should be considered.