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. Author manuscript; available in PMC: 2024 Mar 11.

Published in final edited form as: Am J Obstet Gynecol. 2023 Aug 15;230(3 Suppl):S1014–S1026. doi: 10.1016/j.ajog.2022.03.016

Figure 2: — A: Sagittal CT of the pelvis in upright position illustrates that the pelvic inlet and pelvic outlet do not lie in parallel planes. B: The cavity of the true pelvis is comparable to bent cylinder. Note the curvature of the pelvic axis. As with the mechanical threads of a screw, which are aligned in skew orientation, a rotational motion at one end produces forward progression.

Figure 2: — A: Sagittal CT of the pelvis in upright position illustrates that the pelvic inlet and pelvic outlet do not lie in parallel planes. B: The cavity of the true pelvis is comparable to bent cylinder. Note the curvature of the pelvic axis. As with the mechanical threads of a screw, which are aligned in skew orientation, a rotational motion at one end produces forward progression.