髋臼外缘缺损对髋臼假体初始稳定性影响的有限元研究  

Finite Element Study on the Effect of Acetabular External Edge Defect on the Initial Stability Of Acetabular Prosthesis

作　　者：顾彬 王跃 Gu Bin;Wang Yue(Department of Orthopaedics,363 Hospital,Chengdu 610000,China;Department of Clinical Medical College,Southwest Medical University,Luzhou 646000,China;Department of Orthopaedics,Sichuan Academy of Medical Sciences·Sichuan Provincial People's Hospital,Chengdu 610072,China)

机构地区：[1]三六三医院骨科,四川成都610000 [2]西南医科大学临床医学院,四川泸州646000 [3]四川省医学科学院·四川省人民医院骨科,四川成都610072

出　　处：《实用骨科杂志》2024年第4期322-325,共4页Journal of Practical Orthopaedics

摘　　要：目的通过三维有限元方法探索行全髋关节置换术中生物型臼杯置入时初始稳定的髋臼缺损临界条件。方法利用计算机软件重建骨盆三维模型,设计不同的髋臼外缘缺损,并分别对不同的缺损模型进行力学加载,计算出不同缺损模型下髋臼杯的覆盖率以及臼杯相对宿主骨的临界微动位移。结果当α=-25°时,臼杯相对宿主骨的最大微动位移为39μm,髋臼覆盖率为67.1%,此时达到臼杯稳定的临界值。结论采用生物性假体进行全髋关节置换术时,在无额外固定条件下,应保持髋臼杯骨覆盖率不低于67.1%,以保证正常步态下置入髋臼杯的初始稳定性。Objective To explore the critical condition of initial stable acetabular defect in total hip arthroplasty(THA)by using three-dimensional finite element method.Methods The three-dimensional pelvic model was reconstructed by computer software,and different external defects of acetabulum were designed.The coverage rate of acetabulum cup under different defect models and the critical frettage displacement of acetabulum cup relative to host bone were calculated.Results Whenα=-25°,the maximum displacement of acetabulum relative to host bone was 39μm,and the acetabulum coverage was 67.1%,which reached the critical value of acetabulum stability.Conclusion During total hip replacement with biological prosthesis,the bone coverage of the acetabular cup should be maintained at least 67.1%without additional fixation to ensure the initial stability of the acetabular cup implantation with normal gait.

关 键 词：髋臼缺损 臼杯 三维有限元 微动位移 

分 类 号：R687[医药卫生—骨科学]