Persistent occiput posterior position and stress distribution in levator ani muscle during vaginal delivery computed by a finite element model

被引:9
作者
Havelkova, Linda [1 ]
Krofta, Ladislav [2 ,3 ]
Kochova, Petra [4 ]
Liska, Vaclav [4 ]
Kalis, Vladimir [5 ,6 ,7 ]
Feyereisl, Jaroslav [2 ,3 ]
机构
[1] Univ West Bohemia, New Technol Res Ctr, Univ 22, Plzen, Czech Republic
[2] Inst Care Mother & Child, Podolske Nabrezi 157, Prague 14700, Czech Republic
[3] Charles Univ Prague, Med Fac 3, Ruska 2411-87, Prague, Czech Republic
[4] Univ West Bohemia, Fac Appl Sci, European Ctr Excellence, Univ 22, Plzen, Czech Republic
[5] Charles Univ Prague, Fac Med Pilsen, Lidicka 1, Plzen, Czech Republic
[6] Charles Univ Prague, Fac Med Pilsen, Biomed Ctr, Prague, Czech Republic
[7] Univ Hosp, Dept Obstet & Gynecol, Plzen, Czech Republic
关键词
FEM modeling; Levator ani muscle trauma; Ogden material model; Persistent occiput posterior position; Vaginal delivery; 2ND-STAGE; DURATION; STRETCH; BIRTH;
D O I
10.1007/s00192-019-03997-8
中图分类号
R71 [妇产科学];
学科分类号
100211 ;
摘要
Introduction and hypothesis Objective of this study was to develop an MRI-based finite element model and simulate a childbirth considering the fetal head position in a persistent occiput posterior position. Methods The model involves the pelvis, fetal head and soft tissues including the levator ani and obturator muscles simulated by the hyperelastic nonlinear Ogden material model. The uniaxial test was measured using pig samples of the levator to determine the material constants. Vaginal deliveries considering two positions of the fetal head were simulated: persistent occiput posterior position and uncomplicated occiput anterior position. The von Mises stress distribution was analyzed. Results The material constants of the hyperelastic Ogden model were measured for the samples of pig levator ani. The mean values of Ogden parameters were calculated as: mu 1 = 8.2 +/- 8.9 GPa; mu 2 = 21.6 +/- 17.3 GPa; alpha 1 = 0.1803 +/- 0.1299; alpha 2 = 15.112 +/- 3.1704. The results show the significant increase of the von Mises stress in the levator muscle for the case of a persistent occiput posterior position. For the optimal head position, the maximum stress was found in the anteromedial levator portion at station +8 (mean: 44.53 MPa). For the persistent occiput posterior position, the maximum was detected in the distal posteromedial levator portion at station +6 (mean: 120.28 MPa). Conclusions The fetal head position during vaginal delivery significantly affects the stress distribution in the levator muscle. Considering the persistent occiput posterior position, the stress increases evenly 3.6 times compared with the optimal head position.
引用
收藏
页码:1315 / 1324
页数:10
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