长板与拉力螺钉固定治疗髋臼后柱骨折的建模及稳定性比较  

Modeling and stability comparison of length plate and lag screw fixation in the posterior column of the acetabulum

作　　者：代元元[1,2] 章莹[1] 夏远军[1] 谢会斌[1] 郭晓泽[1] 朱昌荣[1] 

机构地区：[1]广州军区广州总医院骨科医院,广州510010 [2]广州中医药大学研究生院,广州510405

出　　处：《中国临床解剖学杂志》2016年第2期214-219,共6页Chinese Journal of Clinical Anatomy

基　　金：广东省科技计划项目(2012B060100008);广州市科技计划项目(2012J4100039)

摘　　要：目的评估长钢板和逆行经皮拉力螺钉内固定治疗髋臼后柱骨折的生物力学稳定性。方法利用有限元建模软件建立逆行经皮拉力螺钉(A)和长钢板(B)固定髋臼后柱骨折模型,模拟站立位和坐位,以相同的加载方式对两种模型进行三维有限元分析。结果在站、坐位时,髋臼后柱骨折髋臼处最大应力(A分别为12.35 MPa、3.30 MPa;B分别为9.75 MPa、2.87 MPa)、最大位移(A分别为0.45 mm、0.38 mm;B分别为0.44 mm、0.32 mm)及骨折线上各节点位移均数(A分别为0.404±0.049 mm、0.341±0.020 mm;B分别为0.381±0.055 mm、0.300±0.019 mm)均为A>B,A、B间差异具有明显差异。结论长钢板固定髋臼后柱骨折较逆行经皮拉力螺钉具有较好的力学稳定性。Objective To evaluate the biomechanical stability of long plates and retrograde percutaneous lag screws in internal fixation surgery for the treatment of acetabular posterior column fracture.Methods Finite element modeling software was used to establish internal fixation models for treating an acetabular posterior column fracture, including a retrograde percutaneous lag screw（A） and a long plate（B）.The finite element analysis was carried out in standing and sitting by the same loading way. Results In standing and sitting postures, the maximum stress（A were 12.35 MPa, 3.30 MPa; B was 9.75 MPa, 2.87MPa; respectively）, the maximum displacement（0.45 mm and 0.38 mm respectively for A; 0.44 mm and 0.32 mm respectively for B） and the mean node displacement of fracture lines（0.404±0.049 mm and 0.341±0.020 mm for A; 0.381 ± 0.055 mm and 0.300 ± 0.019 mm respectively for B） of posterior column acetabular fracture were all larger in A than in B, and the difference between A and B were significant. Conclusion Compared with retrograde percutaneous lag screws, internal fixation using long plates for the treatment of posterior column acetabular fracture was better for mechanical stability.

关 键 词：髋臼 后柱骨折 有限元分析 生物力学 

分 类 号：R683.41[医药卫生—骨科学] R318.01[医药卫生—外科学]