Is pelvic stenosis natural?

summary

If the pelvic diameter is too short or the shape is abnormal, the pelvic cavity is smaller than the limit of fetal presentation, which hinders the descent of fetal presentation and affects the smooth progress of labor. Narrow pelvis can be one or more short diameter lines, or one plane narrow or multiple planes narrow at the same time. Is pelvic stenosis natural? Let's talk about it

Is pelvic stenosis natural?

Rickets flat pelvis: due to rickets in childhood, bone softening makes pelvis deform, sacral promontory is pressed forward, anterior and posterior diameter of pelvic entrance is significantly shortened, making pelvic entrance in kidney shape, lower segment of sacrum moves backward, losing normal curvature of sacrum, becoming straight and backward. The tail bone is a hook like process to the pelvic outlet plane. Because of the abduction of the iliac bone, the diameter of the iliac spine is equal to or greater than that of the iliac crest; Because of the eversion of ischial tubercle, the angle of pubic arch increased and the transverse diameter of pelvic outlet widened.

Funnel pelvis: the diameter of pelvic entrance is normal. Because the pelvic walls on both sides incline inward, like a funnel, it is called funnel pelvis. The characteristic is that the middle pelvis and pelvic outlet plane are obviously narrow, which shortens the ischial spine diameter and ischial tubercle diameter, and the angle of pubic arch is less than 90 °。 The sum of the diameter between the ischial tubercles and the sagittal diameter after the outlet is less than 15 cm, which is common in male pelvis.

Narrow pelvis: similar to ape pelvis. The transverse diameters of the pelvic entrance, middle pelvis and pelvic outlet were shortened, the anteroposterior diameter was longer, and the ischial notch was wider. The external diameter of sacroscopic region was normal, but the diameter between iliac spine and iliac crest was shortened.

matters needing attention

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