title: [Finite element analysis of the effects of two kinds of individual extralevator abdominalperineal excision on female pelvic floor].
abstract: OBJECTIVE
  To evaluate the effects of two kinds of individual extralevator abdominalperineal excision(ELAPE) on female pelvic floor biomechanics.
  
  
  METHODS
  Four kinds of finite element model were developed: intact models, ELAPE models and two kinds of individual ELAPE models. The maximal stress and stress distributions of each model under the same pressure were analyzed and compared.
  
  
  RESULTS
  In the individual ELAPE models of dissection plane close to rectum on one side, non-levator ani tissue's maximal stress on levator ani partly reserved side and totally removed side were (3.114±0.129) and (4.856 ±0.128) MPa. The former were lower than the latter (P<0.01). They were both lower than those in ELAPE models which were (5.127±0.070) MPa (P<0.01), and were higher than those in intact model which were (1.963±0.061) MPa (P<0.01). In the individual ELAPE models of dissection plane close to pelvic on one side, non-levator ani tissue's maximal stress on both sides, which were (5.131±0.067) MPa, were similar to those in ELAPE models (P>0.05).
  
  
  CONCLUSIONS
  ELAPE of dissection plane close to rectum on one side is able to reduce the stress of non-levator ani tissue on both sides, especially on levator ani partly reserved side; conversely, ELAPE of dissection plane close to pelvic on one side may not reduce the stress of non-levator ani tissue on either side.
authors.affiliation: Department of Colorectal Surgery, Tianjin Medical University Cancer Institute and Hospital, National Clinical Research Center for Cancer, Key Laboratory of Cancer Prevention and Therapy, Tianjin 300060, China.
authors.forename: Jiefu
authors.initials: J
authors.lastname: Wang
authors.forename: Weida
authors.initials: W
authors.lastname: Wang
authors.forename: Jia
authors.initials: J
authors.lastname: Liu
authors.forename: Yutong
authors.initials: Y
authors.lastname: Chen
authors.forename: Jingwei
authors.initials: J
authors.lastname: Yu
authors.forename: Peng
authors.initials: P
authors.lastname: Zhao
authors.forename: Jianzhong
authors.initials: J
authors.lastname: Liu
mesh_terms: D005260:Female; D020342:Finite Element Analysis; D006801:Humans; D017773:Pelvic Floor / Q000601:surgery; D012007:Rectum