摘要
目的 研究股骨颈骨折单钉内固定角度对骨折端应力分布规律的影响 ,寻找符合生物力学原理的最佳内固定角度 ,为临床应用提供理论依据。方法 在Pro ENGINEER中建立股骨上端实体模型 ,导入ANSYS5 7建立有限元模型。模拟单腿站立的情况 ,对Pauwel′s角为 5 0°的经颈型骨折模型施加载荷 ,分别计算固定角度为30°～ 6 0°范围内 7种不同情况下骨折模型的力学特征 ,以应力、位移、张开位移等参数为指标 ,综合评价不同内固定角度的固定效果。结果 固定角度在 30°到 5 5°之间时 ,各参数值在一定范围内波动 ,并存在基本相同的变化趋势。当螺钉的固定角度为 5 0°时 ,各参数同时达到最小值 ,说明以该角度固定可取得最佳的力学效果。固定角度为 6 0°时 ,各参数显著增大 ,固定后的股骨颈稳定性较其它角度明显降低。结论 当骨折线Pauwel′s角为 5 0°时 ,紧固螺钉固定角度在 30°～ 5 5°均可以取得良好的力学效果 ,并以 5 0°最佳。
Objective To investigate the effect of stress changes at different angles with a single screw in internal fixation for femoral neck fracture, and find out the best angle of internal fixation which fits the principle of biomechanics. The study may offer a theoretical foundation for the treatment of femoral neck fracture. Method A solid model is created in Pro/ENGINEER software and exported to ANSYS 5.7 to simulate one leg in a stand position. In this paper, a femoral neck fracture of Pauwel's 50° is used to evaluate different fixation angles (30° to 60°) according to the stress, displacement and fissure distance. Result The stress, displacement and fissure distance fluctuate among a range and have the similar trend when the angle of internal fixation range from 30° to 50°. The minimal value is observed at 50° (fixation angle) and increase noticeably at 60°. Conclusion All the angles of internal fixation (between 30°～55°) can have good effects, and the best results are obtainable at an angle of 50 degree.
出处
《北京生物医学工程》
2004年第3期192-194,197,共4页
Beijing Biomedical Engineering
基金
国家"8 63"计划项目 ( 2 0 0 2AA42 12 5 0 )资助
