内外固定组合装置治疗股骨颈骨折的生物力学原理

THE MECHANISM OF INTERNAL-EXTERNAL COMPOSITE FIXTURE FOR MANAGEMENT OF FEMORAL NECK FRACTURE

目的：作者根据生物力学原理研制出一种新型治疗股骨颈骨折的组合固定器械，并对其进行生物力学测试。方法：职7具尸体髋关节标本，模拟股骨颈骨折然后采用组合装置固定，对照组采用单纯加压螺纹钉固定，对比两组固定的生物力学强度和刚度。结果：实验组在应力－应变，位移，刚度，抗扭强度和承载能力5方面均优于对照组。结论：组合装置固定优于单纯螺纹钉内固定。

Objective: To make biomechanical study on our newly develeped composite fixture- external fixatorand 3 compress perews for fem ornal neck fracture. Methods f Seven cadaveric hip joints were used inbiomechanical investigation. First. some data of normal hip joints were recorded, then, thespecimens were divided into two groups and control osteomy was performed to the model of thefYacture of femoral neck. The tested group was fixed by the composite fixture and control group wasfixed by only three compress screws, Results: the distribution of stress, strain, displacement,rotation and ultimate strength were recorded, the results of the composite fixture were found to bestronger thnn that of the control group. Conclusionf the stab1ility effect of the composite Iixture isbetter than that of the screws.