Sheng Wei, Ji Aimin, Chen Changsheng
School of Mechanical and Electrical Engineering, Hohai University, Changzhou, 213022.
Changzhou Orthmed Medical Instrument Co. Ltd., Changzhou, 213022.
Zhongguo Yi Liao Qi Xie Za Zhi. 2017 May 30;41(3):196-199. doi: 10.3969/j.issn.1671-7104.2017.03.011.
To evaluate the biomechanical stability of femoral shaft fracture fixation using different locking plates combined with different screw layout, for two different fracture settings, we build six groups different length locking plate combined with different screw number and different screw layout, fix with the fracture models respectively, and use the biomechanical finite element method to analysis the models. Then we attain the axial displacement and equivalent stress distribution of the internal fixation system under the action of axial load. The research shows that filling relatively softer material in femoral fracture can guarantee the stability of the internal fixation system, the long plate combined with less screw layout is obviously better than the short plate combined with the all screw layout, the same length plate combined with the selective screw layout is more effective than combined with the all screw layout. And plate combined with screws fixed in four threaded hole of distal fracture make the screw system stress disperse, and avoiding screw fixed in proximal fracture can alleviate the stress concentration of screws.
为评估使用不同锁定钢板并结合不同螺钉布局对股骨干骨折固定的生物力学稳定性，针对两种不同骨折情况，构建六组不同长度锁定钢板结合不同螺钉数量及不同螺钉布局，分别与骨折模型固定，采用生物力学有限元方法对模型进行分析。然后获取内固定系统在轴向载荷作用下的轴向位移和等效应力分布。研究表明，在股骨骨折处填充相对较软材料可保证内固定系统的稳定性，长钢板结合较少螺钉布局明显优于短钢板结合全螺钉布局，相同长度钢板结合选择性螺钉布局比结合全螺钉布局更有效。并且钢板结合螺钉固定在远端骨折的四个螺孔可使螺钉系统应力分散，避免在近端骨折处固定螺钉可减轻螺钉的应力集中。
