Background:
To provide a pelvic modelling of a pregnant woman to numerically simulate childbirth. It aims to assist in the understanding of the pathophysiology of urogenital prolapse by analysing weaknesses areas and constraints on each pelvic structures during delivery.

Material and Methods:
We have constructed a numerical modelling of the pelvic system of a pregnant woman with the finite elements method from MRI segmentations. The mechanical properties of pelvic tissues previously defined by the team have been used and adapted to the context of pregnancy.

Result:
This modelling of pregnant woman constructed is valid and simulates delivery. During the passage of a fetal head in the 50th percentile for 41 weeks of amenorrhea, uterosacral ligaments undergo a 30% deformation. Uterosacral ligaments are the major support structures in the pelvis, its damage is potentially involved in the occurrence of urogenital prolapse.
We were able to simulate a delivery depending on the gestational age. The impact on uterosacral ligaments is increased with the raise of the fetal head size.

Conclusion:
This is the most complete modelling of pregnant woman. It currently allows us to evaluate the impact of childbirth on uterosacral ligaments and to deduce their accountability in the pathophysiology of urogenital prolapse. The first results are promising, but the modelling optimization and future simulations will allow us to further analyze the impact of delivery on the pelvic floor. Similarly the analysis of different birth scenarios are planned and would be useful on the one hand for perineal injuries and on the other for teaching obstetrical mechanics.