title: Finite element analysis of the pelvis after modular hemipelvic endoprosthesis reconstruction.
abstract: OBJECTIVE
  The aim of this study was to investigate the biomechanics of the pelvis reconstructed with a modular hemipelvic prosthesis using finite element (FE) analysis.
  
  
  METHODS
  A three-dimensional FE model of the postoperative pelvis was developed and input into the Abaqus FEA software version 6.7.1. Mesh refinement tests were then performed and a force of 500 N was applied at the lamina terminalis of the fifth lumbar vertebra along the longitudinal axis of the normal pelvis and the postoperative pelvis for three positions: sitting, standing on two feet, and standing on the foot of the affected side. Stress distribution analysis was performed between the normal pelvis and postoperative pelvis at these three static positions.
  
  
  RESULTS
  In the normal pelvis, stress distribution was concentrated on the superior area of the acetabulum, arcuate line, sacroiliac joint, sacral midline and, in particular, the superior area of the greater sciatic notch. In the affected postoperative hemipelvis, stress distribution was concentrated on the proximal area of the pubic plate, the top of the acetabular cup, the connection between the CS-fixator and acetabular cup and the fixation between the prosthesis and sacroiliac joint.
  
  
  CONCLUSIONS
  Stress distribution of the postoperative pelvis was similar to the normal pelvis at three different static positions. Reconstruction with a modular hemipelvic prosthesis yielded good biomechanical characteristics.
authors: Department of Orthopaedics, West China Hospital, Sichuan University, Chengdu, 610041, China.
authors: Yong
authors: Y
authors: Zhou
authors: Li
authors: L
authors: Min
authors: Yang
authors: Y
authors: Liu
authors: Rui
authors: R
authors: Shi
authors: Wenli
authors: W
authors: Zhang
authors: Hui
authors: H
authors: Zhang
authors: Hong
authors: H
authors: Duan
authors: Chongqi
authors: C
authors: Tu
mesh_terms: D000077:Acetabulum; D001696:Biomechanical Phenomena; D020342:Finite Element Analysis; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008159:Lumbar Vertebrae; D008297:Male; D008422:Materials Testing; D008875:Middle Aged; D008953:Models, Anatomic; D010384:Pelvic Bones / Q000601:surgery*; D019736:Prostheses and Implants; D011474:Prosthesis Design; D019919:Prosthesis Implantation / Q000295:instrumentation* / Q000379:methods*; D011630:Pubic Bone; D012446:Sacroiliac Joint; D013314:Stress, Mechanical