title: [Three-dimensional finite element analysis responsible to bone cement with customized prosthesis of proximal segmental femur].
abstract: OBJECTIVE
  To create three-dimensional finite element models for the large defect of proximal femur and the customized prosthesis of proximal segmental defect femur, and to analyze the influence on the stress distribution of femur-cement after the intramedullary implantation of different stem length prostheses.
  
  
  METHODS
  Three-dimensional finite element models were established for the large defect of proximal femur and proximal femoral segmental prostheses with different stem-lengths (140 mm, 120 mm, 100 mm, 80 mm and 60 mm). The influence on stress distribution of femur-cement was analyzed for the different stem-length prostheses implanted.
  
  
  RESULTS
  The stress on bone cement gradually increased from proximal end to distal end, and reached its highest value near the tip of prostheses. The prostheses with stem lengths of 120 mm, 100 mm, 80 mm and 60 mm could bring the cement mantle stress to the value beyond the fatigue strength of cement. Only when the intramedullary stem-length of prosthesis was 140 mm, the stress on the cement mantle was under the fatigue strength of cement.
  
  
  CONCLUSIONS
  The intramedullary stem of the proximal femoral segmental prosthesis must have enough length to decrease the stress on the cement mantle in order to avoid the prosthesis loosening.
authors: Department of Orthopaedic Surgery, West China Hospital, Sichuan University, Chengdu 610041, China.
authors: Yang
authors: Y
authors: Liu
authors: Chong-Qi
authors: CQ
authors: Tu
authors: Xiao-Biao
authors: XB
authors: Li
authors: Hong
authors: H
authors: Duan
authors: Fu-Xing
authors: FX
authors: Pei
mesh_terms: D000328:Adult; D001843:Bone Cements; D005221:Fatigue / Q000503:physiopathology; D005269:Femur / Q000033:anatomy & histology* / Q000502:physiology; D020342:Finite Element Analysis; D006801:Humans; D016268:Internal Fixators; D008297:Male; D008953:Models, Anatomic; D019736:Prostheses and Implants; D013314:Stress, Mechanical; D016474:Weight-Bearing
chemical_list: D001843:Bone Cements