CAJ | 학술논문

背景：仿真力学具有可重复性和对模型无损伤性的优势，加上个性化结构模型提高了有限元分析的可靠性，选择虚拟置换后对膝关节的力学分析不失为一种优化尝试。 　　目的：通过膝关节置换虚拟手术，用有限元法全面分析术后的膝关节接触面的受力状况，为下一步“手术规划”实验提供客观资料。 　　方法：CT/MR扫描患侧膝关节，激光扫描假体，经逆向软件数字化重建假体、膝关节及其韧带并测量下肢力线，根据膝关节置换标准，用Mimics中的Simulation性能模拟膝关节置换手术的截骨、置入假体之后，再将所得的模型导入ANSYS划分网格、材料赋值、施加载荷，以有限元法分析接触应力分布。 　　结果与结论：获得最佳的全膝关节置换后3D膝关节有限元模型，测得的力学数据与前人在力学实验中对假体直接测试所获得的结果基本一致。以有限元方法分析出虚拟置换后膝关节的结构形变、应力分布、内部能量变化等情况，有利于寻找假体置入的最佳位置、优化截骨、预见手术结果，成为手术规划不可缺少的数据。
배경：방진역학구유가중복성화대모형무손상성적우세，가상개성화결구모형제고료유한원분석적가고성，선택허의치환후대슬관절적역학분석불실위일충우화상시。 　　목적：통과슬관절치환허의수술，용유한원법전면분석술후적슬관절접촉면적수력상황，위하일보“수술규화”실험제공객관자료。 　　방법：CT/MR소묘환측슬관절，격광소묘가체，경역향연건수자화중건가체、슬관절급기인대병측량하지력선，근거슬관절치환표준，용Mimics중적Simulation성능모의슬관절치환수술적절골、치입가체지후，재장소득적모형도입ANSYS화분망격、재료부치、시가재하，이유한원법분석접촉응력분포。 　　결과여결론：획득최가적전슬관절치환후3D슬관절유한원모형，측득적역학수거여전인재역학실험중대가체직접측시소획득적결과기본일치。이유한원방법분석출허의치환후슬관절적결구형변、응력분포、내부능량변화등정황，유리우심조가체치입적최가위치、우화절골、예견수술결과，성위수술규화불가결소적수거。
BACKGROUND:Simulative dynamics provides advantages of repeatable and non-invasive to a model. Additional y, structural model of individualism improves the reliability of Finite Elemental Analysis. It is an optimal attempt to analyze mechanics of knee joint after virtual replacement surgery. OBJECTIVE:To achieve dynamic information of contact stress upon knee joint surface by finite element analysis surgery for total knee arthroplasty postoperatively, and to provide objective data for further“surgery plan”. METHODS:After scanning affected knee joint by CT/MR and scanning knee prosthesis by laser instrument, a model composed of prosthesis, knee joint as wel as its ligament was rebuilt computational y;dynamic lines were measured. After prosthesis instal ation&osteotomy performed by facility of Simulation in Mimics according to knee joint replacement standard, this model was imported into ANSYS so as for Meshing, Material assignment, load applied. Stress distribution was analyzed by Finite Element Method. RESULTS AND CONCLUSION:The best finite element model of postoperative TKA 3D knee joint was obtained;dynamic data were tested to be approximately agreeable to those previous studies of direct measurement upon prosthesis. The experiment of analyzing structural deformation, stress distribution&internal energy change benefits to search the best position for prosthesis instal ation, osteotomy and surgical result prediction. Thus, these are indispensable data in surgery plan.