【摘要】 目的建立胫骨远端后侧不同类型骨折三维有限元模型,探讨骨折块高度与关节面受累比例对骨折稳定性的影响。方法获取男性成年人正常足踝CT数据,采用minics 14.0软件进行三维重建,使用geomagic 2012、Solidwork和ANSYS软件制作踝关节有限元模型,利用Solidwork及ANSYS软件,制作两种胫骨远端后侧骨折有限元模型(后外侧型和内侧延伸型),在对其有限性进行验证基础上,模拟中立位垂直加载全部体重600N的工况,对不同高度(2cm-5cm)以及不同关节面受累比例的骨折模型(共16组)进行有限元分析,分析两种模型的骨折块最大位移程度以及骨折块的高度和关节面受累比例与骨折稳定性的关系。结果 (1)两种胫骨远端后侧骨折模型的建立:建立模型还原性良好,关节面接触关系等结果与相关文献中相同加载条件下的生物力学试验结果相符合,可以进行下一步有限元分析。(2)两种模型的有限元分析:两种模型中,胫骨远端关节面受累比例和骨折块高度均与骨折稳定性呈负相关。骨折块高度越大,关节面受累比例越大,则骨折块稳定性越差。结论建立胫骨远端后侧骨折切实可靠。对于累及胫骨远端后方的骨折,胫骨远端关节面受累比例可以作为反映踝关节稳定性的相关指标。更多还原

【Abstract】 Objective The purpose of this finite element analysis was to construct the finite element models of posterior malleolar fracture and posterior pilon fracture, and then analy whether the stability affecting factors proper that fragment height and the ratio of articular surfaced involved when used for both two fracture models. Methods The CT data of ankle obtained from a normal male volunteer was used to make a three-dimensional reconstruction by mimics 14.0 and geomagic 2012 software. After the building of three-dimensional finite element model of the ankle with the stimulated ligaments in ANSYS software, the validity of the model was verified. The mainly two models of distal tibial posterior fractures in various fragment height and the ratio of articular surfaced involved were cut according to the established methods. The displacements of fragments which reflecting the stability were calculated by finite element analysis and then decide d the possible relationship between them and stability. Results The models of distal tibial posterior fractures were established with a relatively good persistence with the results in previous study. Fragment height and the ratio of articular surfaced involved both affect the fracture stability with a similar trend. Both the relationship in the two models was determined. Conclusions The models of distal tibial posterior fractures could be constructed persistent with the real model in the previous study. Fragment height and the ratio of articular surfaced involved both affect the fracture stability with a similar trend for distal tibial posterior fractures.更多还原