title: Influence of Different Boundary Conditions in Finite Element Analysis on Pelvic Biomechanical Load Transmission.
abstract: OBJECTIVE
  To observe the effects of boundary conditions and connect conditions on biomechanics predictions in finite element (FE) pelvic models.
  
  
  METHODS
  Three FE pelvic models were constructed to analyze the effect of boundary conditions and connect conditions in the hip joint: an intact pelvic model assumed contact of the hip joint on both sides (Model I); and a pelvic model assumed the hip joint connecting surfaces fused together with (Model II) or without proximal femurs (Model III). The model was validated by bone surface strains obtained from strain gauges in an in vitro pelvic experiment. Vertical load was applied to the pelvic specimen, and the same load was simulated in the FE model.
  
  
  RESULTS
  There was a strong correlation between the FE analysis results of Model I and the experimental results (R2= 0.979); meanwhile, the correlation coefficient and the linear regression function increased slightly with increasing load force. Comparing the three models, the stress values in the point near the pubic symphysis in Model III were 48.52 and 39.1% lower, respectively, in comparison with Models I and II. Furthermore, the stress values on the dome region of the acetabulum in Models II and III were 103.61 and 390.53% less than those of Model I. Besides, the posterior acetabular wall stress values of Model II were 197.15 and 305.17% higher than those of Models I and III, respectively.
  
  
  CONCLUSIONS
  These findings suggest that the effect of the connect condition in the hip joint should not be neglected, especially in studies related to clinical applications.
authors.affiliation: Department of Orthopaedic Surgery, Emergency Center of Trauma, Key Laboratory of Orthopaedic Biomechanics of Hebei Province, Orthopaedic Research Institution of Hebei Province, Third Hospital of Hebei Medical University, Shijiazhuang, China.
authors.forename: Pan
authors.initials: P
authors.lastname: Hu
authors.affiliation: Department of Orthopaedic Surgery, Emergency Center of Trauma, Key Laboratory of Orthopaedic Biomechanics of Hebei Province, Orthopaedic Research Institution of Hebei Province, Third Hospital of Hebei Medical University, Shijiazhuang, China.
authors.forename: Tao
authors.initials: T
authors.lastname: Wu
authors.affiliation: International Research Center for Implantable and Interventional Medical Devices, School of Biological Science and Medical Engineering, Beihang University, Beijing, China.
authors.forename: Hui-Zhi
authors.initials: HZ
authors.lastname: Wang
authors.affiliation: International Research Center for Implantable and Interventional Medical Devices, School of Biological Science and Medical Engineering, Beihang University, Beijing, China.
authors.forename: Xin-Zheng
authors.initials: XZ
authors.lastname: Qi
authors.affiliation: International Research Center for Implantable and Interventional Medical Devices, School of Biological Science and Medical Engineering, Beihang University, Beijing, China.
authors.forename: Jie
authors.initials: J
authors.lastname: Yao
authors.affiliation: Department of Orthopaedic Surgery, Emergency Center of Trauma, Key Laboratory of Orthopaedic Biomechanics of Hebei Province, Orthopaedic Research Institution of Hebei Province, Third Hospital of Hebei Medical University, Shijiazhuang, China.
authors.forename: Xiao-Dong
authors.initials: XD
authors.lastname: Cheng
authors.affiliation: Department of Orthopaedic Surgery, Emergency Center of Trauma, Key Laboratory of Orthopaedic Biomechanics of Hebei Province, Orthopaedic Research Institution of Hebei Province, Third Hospital of Hebei Medical University, Shijiazhuang, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Chen
authors.affiliation: Department of Orthopaedic Surgery, Emergency Center of Trauma, Key Laboratory of Orthopaedic Biomechanics of Hebei Province, Orthopaedic Research Institution of Hebei Province, Third Hospital of Hebei Medical University, Shijiazhuang, China.
authors.forename: Ying-Ze
authors.initials: YZ
authors.lastname: Zhang
mesh_terms: D000328:Adult; D001696:Biomechanical Phenomena; D002102:Cadaver; D005260:Female; D020342:Finite Element Analysis; D006621:Hip Joint / Q000502:physiology; D006801:Humans; D008953:Models, Anatomic; D010384:Pelvic Bones / Q000502:physiology*; D013314:Stress, Mechanical; D016474:Weight-Bearing
keywords: Biomechanics; Finite element analysis; Pelvis