Modeling and stability comparison of length plate and lag screw fixation in the posterior column of the acetabulum
DAI Yuan-yuan, ZHANG Ying, XIA Yuan-jun, XIE Hui-bing, GUO Xiao-ze, ZHU Chang-rong
Chinese Journal of Clinical Anatomy ›› 2016, Vol. 34 ›› Issue (2) : 214-219.
Modeling and stability comparison of length plate and lag screw fixation in the posterior column of the acetabulum
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, 2.87 MPa; 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.
Acetabulum / Posterior column fracture / Finite elementanalysis / Biomechanics
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