新型组合式锁定加压钢板生物力学性能的三维有限元分析  

Three dimensional finite element of new assembly locking compression plate

作　　者：周江军[1] 肖春林[1] 赵敏[1] 罗飞[2] 吕仁发[1] 杨俊[1] 付美清[1] 史柏娜[1] 雷雪[1] 余专一 程球新 

机构地区：[1]中国人民解放军第184医院骨科,南京军区福州总医院骨科研究所临床基地,江西鹰潭335000 [2]第三军医大学西南医院骨科

出　　处：《中华生物医学工程杂志》2016年第1期1-6,共6页Chinese Journal of Biomedical Engineering

基　　金：“十二五”全车后勤科研计划重点项目（BNJl3J003）;南京军区面上项目（12MA049）;汀两省科技支撑计划（20132BBG70092）

摘　　要：目的：通过有限元分析的方法观察新型组合式锁定加压钢板（NALCP）与传统锁定加压钢板（LCP）固定股骨粉碎性骨折的应力分布情况。方法采用64排螺旋CT对一名健康成年男性股骨进行层厚为0.625 mm扫描，获得股骨CT数据，通过Mimics、Geomagic等逆向工程软件获得股骨有限元模型，模拟股骨中段粉碎性骨折，分别采用NALCP和LCP两种钢板模拟手术固定，加以缓慢行走单腿股骨载荷及扭转载荷，分析两种不同固定方式钢板及股骨的应力分布情况。结果两种载荷情况下， NALCP与LCP骨折断端区域钢板应力分布变化趋势基本一致，应力分布均匀。缓慢行走载荷NALCP主钢板最大应力值为5.292×10^2 Mpa，滑槽钢板部件最大应力值为9.388×10^2 Mpa，骨折块最大位移为1.428 mm，LCP钢板最大应力值为6.485×10^2 Mpa，骨折块最大位移2.633 mm；扭转载荷NALCP主钢板最大应力值为6.172×10^2 Mpa，滑槽钢板部件最大应力值为1.059×10^3 Mpa，骨折块最大位移为1.495 mm，LCP钢板最大应力值为1.059×10^3 Mpa，骨折块最大位移为2.103 mm。结论 NALCP既能够为骨干粉碎性骨折提供坚强的力学稳定性，又能为骨折断端保证足够的力学刺激，促进骨愈合。Objective To investigate the stress distribution of new assembly locking compression plate（NALCP）and conventional locking compression plate（LCP）in the fixation for femoral comminuted fracture by finite element analysis（FEA）. Methods The femur of a healthy male adult received 64-slice spiral CT scanning with 0.625 mm slice thickness,and the femur CT data was obtained. The femur finite element models were established by reverse engineering softwares,such as Mimics and Geomagic,to simulate the middle femoral comminuted fracture. The models received simulated fixation by using NALCP and LCP,respectively. Loads were applied on the two models to simulate a person slowly walking by one leg or torsion. The stress distribution of NALCP and LCP,and femur was analyzed. Results In both loading conditions,the tendency of NALCP and LCP stress distribution at the fracture end points was consistent, with well-distributed stress. Under slowly walking load,the maximum stress of the main NALCP was 5.292× 10^2 Mpa,the maximum stress of the runner plate was 9.388×10^2 Mpa,and the maximum displacement of the bone block was 1.428 mm. The maximum stress of the main LCP was 6.485 × 10^2 Mpa,and the maximum displacement of the bone block was 2.633 mm. Under torsion load,the maximum stress of the main NALCP was 6.172 × 10^2 Mpa,the maximum stress of the runner plate was 1.059 × 10^3 Mpa,and the maximum displacement of the bone block was 1.495 mm. The maximum stress of the main LCP was 1.059 × 10^3 Mpa, and the maximum displacement of the bone block cross-section was 2.103 mm. Conclusion NALCP may provide strong mechanical stability for comminuted femoral fracture and adequate stress stimulation for fracture end points,to promote bone healing.

关 键 词：股骨骨折 骨折固定术 内 有限元分析 生物力学 

分 类 号：R683[医药卫生—骨科学] R318.01[医药卫生—外科学]