title: Finite element analysis of the stability of combined plate internal fixation in posterior wall fractures of acetabulum.
abstract: OBJECTIVE
  This study aims to explore the mechanical stability of combined plate internal fixation in posterior wall fractures of the acetabulum.
  
  
  METHODS
  The fracture and internal fixation models were established in this study and they were divided into four kinds of internal fixation models, finite element analysis was performed. The four groups were 2 mini-plates and 1 reconstruction plate fixation (A), Reconstruction plate internal fixation group (B), 2 screws internal fixation group (C) and mini-plates internal fixation group (D). The displacement of each node was measured and evaluated.
  
  
  RESULTS
  There was no distortion in the geometric shape of the finite element model. The results of stress showed that it was less in the anterior pelvic ring and distributed uniform in labrum acetabulare; the stress was bigger in the upper and middle of sacroiliac joint and sciatic notch in sitting position.
  
  
  CONCLUSIONS
  Combined plate internal fixation for posterior wall fractures of acetabular were stable and reliable, it is better than the other three methods.
authors.affiliation: Department of Orthopedics, Wuhan General Hospital of Guangzhou Military Command Wuhan 430070, Hubei, China.
authors.forename: Xi-Ming
authors.initials: XM
authors.lastname: Liu
authors.affiliation: Department of Orthopedics, The People's Hospital of Tuan Feng Huanggang 4380000, Hubei, China.
authors.forename: Chang-Wu
authors.initials: CW
authors.lastname: Pan
authors.affiliation: Department of Orthopedics, Wuhan General Hospital of Guangzhou Military Command Wuhan 430070, Hubei, China.
authors.forename: Guo-Dong
authors.initials: GD
authors.lastname: Wang
authors.affiliation: Department of Orthopedics, Wuhan General Hospital of Guangzhou Military Command Wuhan 430070, Hubei, China.
authors.forename: Xian-Hua
authors.initials: XH
authors.lastname: Cai
authors.affiliation: Department of Orthopedics, Wuhan General Hospital of Guangzhou Military Command Wuhan 430070, Hubei, China.
authors.forename: Lei
authors.initials: L
authors.lastname: Chen
authors.affiliation: Department of Orthopedics, Wuhan General Hospital of Guangzhou Military Command Wuhan 430070, Hubei, China.
authors.forename: Cheng-Fei
authors.initials: CF
authors.lastname: Meng
authors.affiliation: Department of Orthopedics, The Second People's Hospital of Yi Chang Yi Chang 443000, Hubei, China.
authors.forename: Jin-Cheng
authors.initials: JC
authors.lastname: Huang
keywords: Finite element; acetabular fracture; mini-plate; posterior wall