2.0 mm和2.5 mm直径螺钉固定钛合金尺骨冠突假体稳定性的有限元分析  

Finite element analysis of stability of ulnar coronoid process prosthesis using 2.0 mm and 2.5 mm screws fixation

作　　者：鲁谊[1] 张海龙[1] 林坤志 魏鸿文 Lu Yi;Zhang Hailong;Lin Kunzhi;Wei Hongwen(Department of Sports Medicine,Bejing Jishuitan Hospital,Beijing 100035,China;Chun Yuan Christian University,Taiwan,China;Physical Medicine and Assistive Science Dpartment of National Yang Ming University,Taiwan,China)

机构地区：[1]北京积水潭医院运动损伤科,100035 [2]台湾中原大学医疗器材科技转译中心 [3]台湾阳明大学物理治疗暨辅助科技学系

出　　处：《中华骨科杂志》2020年第1期46-51,共6页Chinese Journal of Orthopaedics

基　　金：国家自然科学基金(81672137)。

摘　　要：目的比较直径2.0 mm与2.5 mm螺钉固定基于正常人群肘关节形态而完成的3D打印钛合金尺骨冠突假体的力学稳定性。方法通过对正常骨性结构的成年受试者的肘关节进行CT扫描并行三维重建后设计尺骨冠突假体,分别模拟使用直径为2.0 mm及2.5 mm的螺钉进行固定。对屈肘30°、90°、130°下两种直径螺钉固定尺骨冠突假体的稳定性进行有限元分析并比较其等效应力峰值和假体最大位移量。结果肘关节屈曲30°时,2.0 mm组螺钉与2.5 mm组螺钉的等效应力峰值分别为56.29 MPa及39.96 MPa,假体最大位移量分别为0.0380 mm及0.0290 mm;肘关节屈曲90°时,2.0 mm组螺钉与2.5 mm组螺钉等效应力峰值分别为8.97 MPa及8.12 MPa,假体最大位移量分别为0.0065 mm及0.0058 mm;肘关节屈曲130°时,2.0 mm组螺钉与2.5 mm组螺钉等效应力峰值分别为10.03 MPa及9.32 MPa,假体最大位移量分别为0.0079 mm及0.0066 mm。两种螺钉固定方式的最大等效应力均位于螺钉的顶帽与顶杆螺纹交界处,直径2.5 mm螺钉的等效应力峰值在同一屈曲角度时较2.0 mm螺钉低;在尺骨冠突假体位移方面,不论何种屈曲角度,2.5 mm螺钉固定的假体位移量均较2.0 mm螺钉小。结论直径2.5 mm螺钉较2.0 mm螺钉固定3D打印钛合金尺骨冠突假体固定更稳定。Objective To compare difference in stability between two fixation modes in application of three-dimensional(3D)printed coronoid process prosthesis.Methods 3D coronoid process prosthesis was reconstructed from computed tomography(CT)scanning acquired from volunteers with normal bony architecture of elbow.The prosthesis fixation was simulated using screws with diameter of 2.0 mm and 2.5 mm separately.Finite element analysis(FEA)was conducted at elbow flexion with different angles and the parameters including the maximum equivalent stress and the maximum displacement were evaluated.Results Compared fixation using screw with the diameter of 2.0 mm and 2.5 mm,the maximum equivalent stress were 56.29 MPa and 39.96 MPa and the maximum displacement were 0.0380 mm and 0.0290 mm in 30°flexion of elbow;the maximum equivalent stress were 8.97 MPa and 8.12 MPa and the maximum displacement were 0.0065 mm and 0.0058 mm in 90°flexion of elbow;the maximum equivalent stress were 10.03 MPa and 9.32 MPa and the maximum displacement were 0.0079 mm and 0.0066 mm in 130°flexion of elbow.The maximum equivalent stress occurs at the junction of head and shaft with in both situations while the value from screw with diameter of 2.5 mm was lower.The displacement was smaller in the screw with diameter of 2.5 mm.Conclusion Compared to screws with the diameter of 2 mm,screw with the diameter of 2.5 mm shows superior stability in the fixation of 3D printed coronoid process prosthesis.

关 键 词：尺骨 假体和植入物 有限元分析 

分 类 号：R687[医药卫生—骨科学]