单臂外固定架近端不同固定方式固定股骨粗隆间骨折的生物力学性能分析

发布时间：2018-05-08 20:33

本文选题：单臂外固定架 + 近端不同固定方式　；参考：《中华中医药学刊》2015年10期

【摘要】：目的:探讨单臂外固定架近端不同固定方式固定股骨粗隆间骨折的生物力学性能。方法:应用生物力学应变测试技术与电测实验方法测试单臂外固定架近端不同固定方式固定PVC材料粗隆间骨折模型,其近端固定方式分别为内聚式、交叉式、平行式,分别测定不同固定方式的压应力及位移。结果:我们对固定模型施加0~400 N纵向载荷。随着压力不断增加,股骨两端的位移量最大值分别为2.49 mm、5.97 mm、4.37 mm;施压同时,得出3种模型不同测点处应力感应值,内聚式应变最大值出现在测点7(5号固定针内下侧),为-2 580.67±78.01;内聚式应变最大值出现在测点6(4号固定针内下侧),为-5 436±177.76;平行式应变最大值出现在测点2(骨折断端已近内侧),为-4 973.33±375.16,三者相比,内聚式应变值差异较小,应力分布较均匀。结果显示近端内聚式单臂外固定架较其他两种更能恢复并保持股骨近端抗弯小梁承载的基本功能,有效拮抗剪应力对于骨折愈合的不利影响。结论:近端内聚式单臂外固定架固定治疗老年股骨粗隆间骨折模型其生物力学性能是优化的,且更加安全可靠。
[Abstract]:Objective: to investigate the biomechanical properties of intertrochanteric fracture of femur treated with single arm external fixator. Methods: the intertrochanteric fracture model of PVC material was fixed by biomechanical strain test and electrical test. The proximal fixation methods were cohesive, cross and parallel. The compressive stress and displacement of different fixation methods were measured respectively. Results: we applied 0 400 N longitudinal load to the fixed model. With the increasing of pressure, the maximum displacement at both ends of femur was 2.49 mm / 5.97 mm / 4.37 mm respectively. At the same time, the stress induction values at different measuring points of three models were obtained. The maximum value of cohesive strain appeared at point 7 (2 580.67 卤78.01), the maximum value of cohesive strain appeared at point 6 (-5 436 卤177.76), and the maximum value of parallel strain appeared at point 2 (fracture end was close to fracture end). The medial trochleus, -4 973.33 卤375.16, were compared with each other. The difference of the cohesive strain value is small, and the stress distribution is more uniform. The results showed that the proximal cohesive single arm external fixator could recover and maintain the basic function of the proximal femur bending trabeculae and effectively antagonize the adverse effect of shear stress on fracture healing. Conclusion: the biomechanical properties of the elderly model of femoral intertrochanteric fracture treated with proximal cohesive single arm external fixator are optimized and more safe and reliable.
【作者单位】：天津中医药大学;天津中医药大学第二附属医院;天津理工大学;
【基金】：天津市中医药管理局中医、中西医结合科研项目(11051、13106) 天津市高等学校科技发展基金计划项目(20110201、20120217) 天津市中医重点专科项目
【分类号】：R687.3;R318.01

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