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. Author manuscript; available in PMC: 2018 Dec 1.
Published in final edited form as: Semin Perinatol. 2017 Oct 5;41(8):505–510. doi: 10.1053/j.semperi.2017.08.009

Figure 1. Computer simulation results of improving cervical stroma material and cervical angle.

Figure 1

The increase in stromal material stiffness and the alignment of the cervical canal with the uterine axis reduces the amount of tissue stretching at the internal os. Percentages indicate the volume ratio of the internal os that is above 8% tensile strain under intrauterine pressure of 8.67kPA. Details of the finite element model are found in Westervelt et al., 2017.48 A soft and stiff cervix are assigned collagen fiber moduli of 1.71kPa and 769kPa, respectively.