股骨粗隆间骨折术后步行状态的生物力学特性

目的：研究单臂外固定架治疗股骨粗隆间骨折术后步行状态的生物力学特性。 方法：将 CT 数据文件经Simpleware 软件进行三维重建处理，得到股骨及外固定架的三维几何模型。在 Anybody 软件中建立正常人体股骨模型，并与股骨外固定架模型（stl 几何模型）一同导入 Geomagic Studio 软件中，将两组模型进行比对配准。将配准好的股骨外固定架模型导入 Anybody 软件中，通过 Simpleware 得到的网格模型（inp 格式）导入到 Abaqus 软件中，分析 1 个步态周期的应力分布情况。结果：以左侧为例，术后在行走过程中较大应力发生在不锈钢钉与股骨的连接处以及不锈钢钉与固定架的连接处，整体未见明显应力集中现象，在典型步态右足趾离地和左全足底着地中产生较大应力，在左足跟着地、右足跟着地产生一定应力集中现象，左足趾离地时应力最小。结论：单臂外固定架治疗股骨粗隆间骨折，安全、有效，符合人体步行状态的生物力学要求。

Postoperative Gait Model and Stress Analysis of Musculoskeletal Three-dimensional Finite Element in Fixtion of Intertrochanteric Fracture about External Fixation Frame

Objective To study the biomechanical characteristics of postoperative gait model in treatment of intertrochanteric fracture of single arm external fixation frame and provide theoretical basis for clinical treatment. Methods To reconstruct three-dimensional geometric model of the femoral and external ?xator by CT data ?le and Simpleware software. The model of normal human femur was established in Anybody software and was imported to the Geomagic Studio software with femoral external ?xator (STL) geometric model at the same time, and the two groups of model were compared and registered. The appropriate external ?xator femoral model was imported into Anybody software, and the Mesh model format (inp) by Simpleware software was imported into Abaqus software. The stress distribution of a gait cycle was analyzed. Results Taking the left side for example, The greater stress occurred in the joint of stainless steel nail and the femur as well as the joint of stainless steel nails and ?xed frame. There was no obvious stress concentration in the whole body. In typical gait, greater stress was produced in the right toe off the ground and the left sole landing, and a certain stress concentration occured in the left heel landing and the right heel landing. The stress was the smallest when the left toe was off the ground. Conclusion The treatment of intertrochanteric fracture by single arm external ?xation frame is safe and effective, and the treatment of fracture accords with the biomechanical requirements for human walking state.