【摘要】 背景:桥接组合式内固定系统在人体骨折固定上,与锁定钢板相比效果如何,有待实验证实。目的:比较桥接组合式内固定系统与金属锁定接骨板钉系统固定股骨干骨折的生物力学特性。方法:对两种固定方式的有限元模型进行模拟加载,了解各模型中骨与内固定的应力分布和应变特点,并对结果加以分析。结果与结论:爬楼梯时接骨板锁定螺钉上的应力比步态时增48.6%,达到480MPa,最大应力出现在中间锁定螺钉上。桥接系统中间联接棒上的最大应力比步态时大34.1%,最大值为373.9MPa,出现在联接棒中间略远端附近;骨折区域上的应力桥接组合式内固定系统小于金属锁定接骨板钉系统。提示桥接组合式内固定系统较金属锁定接骨板钉系统具有更好的生物力学性能,固定更牢靠、利于骨折生长,是骨折内固定的一种更好选择。更多还原

【Abstract】 BACKGROUND:The effect of the bridge combined fixation system for the fixation of bone fracture compared with locking plate system needs to be confirmed by experiment.OBJECTIVE:To compare the biomechanical properties of bridge combined fixation system and locking plate-screw system for the fixation of femoral fractures.METHODS:We used the finite element analysis method to analyze biomechanical characters of the femoral fractures fixed with the locking plate-screw system and bridge combined fixation system,such as the stress distribution and the strain characteristics of bone and fixation.RESULTS AND CONCLUSION:The stress on the locking plate screw when climbing stairs was increased for 48.6% compared with walking,the stress was 480 MPa and the maximum stress was on the middle of the locking plate-screw screws.The maximum stress on the middle of the bridge system when climbing was 34.1% larger than that when walking,the maximum stress was 373.9 MPa and occurred near the distal connection rod.The stress on the fracture area of bridge combined fixation system was smaller than that of locking plate system.In summary,as a new kind of bone fracture internal fixation,the biomechanical property of the bridge combined fixation system is significantly higher than that of the locking plate system with the advantages of better fixation stability and beneficial to bone growth.更多还原