镁合金钢板内固定治疗胫骨中段骨折的有限元分析

运用有限元分析法, 评价镁合金、钛合金、不锈钢3种不同材料在治疗胫骨干骨折的力学性能差异. 以Dicom格式导入Mimics 20.0软件中建立胫骨三维模型, 并运用Geomagic与Solidwork软件制作胫骨骨折内固定模型, 将上述模型导入Workbench 2020软件中, 赋予材料属性, 给予轴向载荷、扭转载荷2种加载模式, 分析3种材料的应力和位移. 在600N轴向加载模式下, 钛合金内固定应力为(117.42±0.07)MPa, 位移为(0.73±0.11)mm; 镁合金内固定应力为(117.11±0.04)MPa, 位移为(0.82±0.08)mm; 不锈钢内固定应力为(117.53±0.03)MPa, 位移为(0.62±0.13)mm. 在30N?mm扭转加载模式下, 钛合金内固定应力为(174.50±0.33)MPa, 位移为(0.75±0.07)mm; 镁合金内固定应力为(168.75±0.15)MPa, 位移为(0.82±0.16)mm; 不锈钢内固定应力为(176.23±0.51)MPa, 位移为(0.61±0.13)mm. 结果表明: 2种不同加载模式下3种不同材料的内固定结果数值差异不大, 镁合金内固定与钛合金内固定、不锈钢内固定力学性能相似, 而镁合金更亲和人体, 可以代替传统医用金属材料用以治疗胫骨中段骨折.

Finite element analysis research of magnesium alloy plate internal fixation for middle tibial fracture

The present study was designed to evaluate the mechanical properties of magnesium alloy, titanium alloy and stainless steel in the treatment of tibial shaft fracture by using finite element analysis method. A case of high-definition tibia CT data was selected and imported into Mimics 20.0 software in Dicom format. A three-dimensional model of tibia was established. Both Geomagic and Solidwork software packages were used to make internal fixation model of tibia fracture. The model was then imported into Workbench 2020 software with the material attributes specified. Two loading modes, the axial and torsional loading, were given to analyze the stress and displacement of the two materials. Under 600 N axial loading mode, the internal fixed stress of titanium alloy was (117.42±0.07) MPa and the displacement was (0.73±0.11) mm. The internal fixed stress of magnesium alloy was (117.11±0.04) MPa and the displacement was (0.82±0.08) mm. The internal fixed stress of stainless steel was (117.53±0.03) MPa and the displacement was (0.62±0.13) mm. The internal fixed stress of titanium alloy was (174.50±0.33) MPa and the displacement was (0.75±0.07) mm under the torsional loading mode of 30 N?mm. The internal fixed stress of magnesium alloy was (168.75±0.15) MPa and the displacement was (0.82±0.16) mm. The internal fixed stress of stainless steel was (176.23±0.51) MPa and the displacement was (0.61±0.13) mm. The results of internal fixation of three groups of different materials under two different loading modes were not significantly different. The results show that the mechanical properties of magnesium alloy internal fixation are similar to those of traditional titanium alloy internal fixation and stainless steel internal fixation. Moreover, magnesium alloy is better for the human body and may replace the traditional medical metal materials in the treatment of mid-segment tibial fracture.