髋关节外展不同角度股骨颈应力分布的有限元分析

目的比较分析双腿站立时髋关节外展不同角度时股骨颈应力的分布及变化情况,为临床髋关节疾患治疗与康复提供生物力学依据.方法利用中国虚拟人男一号切片数据集的髋部数据,重建人体股骨上半节段的三维有限元仿真模型,模拟髋关节不同的外展角度,对该模型进行虚拟加载和仿真计算,比较分析髋关节外展不同角度下股骨颈的应力分布.结果（1）对于各种外展角度,股骨颈内、外侧方的应力值均明显高于前、后方;（2）随着髋关节外展角度的增加,股骨颈的正后方和后内侧部位应力值逐渐减小,前方的应力值基本保持不变,而内、外侧方的应力值则逐渐增大,以外侧方变化最大.结论股骨颈内、外侧是股骨上半节段的应力集中部位,髋关节外展使应力分布发生改变,临床上应根据患者的实际情况采取合适的手术和康复锻炼方式.

Stress distribution on the femoral neck at different abduction angles of the hip joint: a finite element analysis]

OBJECTIVE: To analyze the stress distribution and its changes of the femoral neck at different abduction angles of the hip joint to provide biomechanical evidence for the treatment of hip joint disease. METHODS: A three-dimensional finite element model of the femoral head region was reconstructed on the basis of data available in the dataset of No.1 Virtual Male Chinese. Different abduction angles of the hip joint were simulated under the load of body weight, and the stress distribution on the femoral neck was calculated and compared. RESULTS: With different abduction angles of the hip joint, the stresses on the medial and lateral sides of the femoral neck were obviously greater than those on the anterior and posterior regions. As the abduction angle of the hip joint increased, the stress on the posterior aspect of the femoral neck decreased while that in other regions increased (except for the anterior aspect of the femoral neck which remained unchanged). CONCLUSION: The lateral aspect of the femoral neck withstands the most intense stress of the body weight, which increases with the abduction angle of the hip joint.