摘要
目的通过有限元方法对内收型股骨颈骨折的不同角度空心加压螺钉固定技术进行比较，判断何种技术生物力学更稳定。方法以内收型股骨颈骨折为研究对象建立有限元模型，模拟单腿站立时的受载情况，对倒三角构型不同角度5组模型置钉技术分别进行有限元计算。结果三钉固定时，各模型抗扭能力相当，5个模型中，传统模型抗张性较好，其中模型2综合指标最好，低角度模型中，虽然模型4、5抗压能力强，但综合指标要差些，其中模型3综合指标最差。结论倒三角构型时，高角度螺钉固定内收型股骨颈骨折比低角度螺钉固定整体稳定性要好，若将远端钉子紧贴或嵌进股骨距皮质层内固定将提高传统高角度模型的整体稳定性。建议临床使用传统高角度低位置钉模型，避免低角度多钉固定。
Objective To explore the biomechanic stabilities of fixation with cannulated compression screws at different angles in treatment of the adductive femoral neck fractures by the finite element analysis （FEA）. Methods Five FEA models of 5 fixation angles for adductive femoral neck fractures were set up to investigate the simulated loading at standing on single leg. Models 1 and 2 simulated conventional high-angle fixation, and Models 3, 4, and 5 low-angle fixation. The biomechanical features of fixation with 3 screws at different angles in an inverted triangular configuration were analyzed. Results The torsion resistance was consistent in the 5 models of 3-screw fixation. The high-angle models were better in stretching resistance; Model 2 was the best in all the parameters. Models 4 and 5 were better in bending resistance but worse in the comprehensive indexes; Model 3 was the worst. Conclusion Since high-angle fixation in inverted triangular configuration provides better biomechanic stability than low-angle fixation, low-angle fixation with multiple screws should be avoided in clinic.
出处
《中华创伤骨科杂志》
CAS
CSCD
2008年第2期173-176,共4页
Chinese Journal of Orthopaedic Trauma
基金
浙江温州市科技局课题（Y20060170）
志谢 衷心感谢四川大学生物力学实验室张代全、张磊两位研究生给予有限元建模、计算的帮助
关键词
股骨颈骨折
骨折固定术
内
生物力学
有限元分析
Femoral neck fracture
Fracture fixation, internal
Biomechanics
Finite element analysis （FEA）
