Pelvis justo major
Congenitally large female pelvis of normal shape
From Wikipedia, the free encyclopedia
Pelvis justo major (also called giant pelvis[1]) is a rare condition of the adult female pelvis where the pelvis flares above the iliopectineal line.[2] It is 1.5 or more times larger than an average pelvis in every direction and is typically at least 42 cm (16.5 inches) in biiliac width. Even though this condition is classified as a congenital abnormality, it is not normally considered a medical disease of the pelvis as it typically holds a true gynecoid shape, only larger, without posing other major health risks except in childbirth.
| Pelvis justo major | |
|---|---|
| Other names | Pelvis aequabiliter justo major; giant pelvis |
| Specialty | Obstetrics |
Pregnant women with this condition, at the time of delivery, may have a precipitous birth.[3] With a wider pelvis justo major, there is no pelvic bone "molding" of the fetal head as is typical for a normally sized pelvis, and as such there is virtually no resistance from the pelvis itself.[4] As this allows for a much more rapid vaginal birth, there is an increased risk of tearing of the perineal soft tissues.[citation needed] At the time of delivery, the strong uterine contractions and maternal bearing down almost instantly overwhelm the integrity of a previously unstretched vaginal orifice. This is often the case if the women have not previously practiced vaginal stretching to the degree that allows such an instant birthing, especially so for a primiparous woman. This sudden or "instant delivery" problem leads many OBGYN doctors to stress the importance of women with a larger pelvis, especially those with Pelvis justo major, practicing pre-delivery vaginal stretching to avoid perineal injury.[citation needed]
Pelvis justo major is present in less than one in one thousand adult women, and a measurement scan or anthropometry by calipers is required to diagnose the condition.[citation needed] The incidence of pelvis justo major pelvis is not found to be a strictly standard deviation type variation, as it follows a tail-skewed deviation to the right. Pelvis justo major is classified as congenital and thought to be partially inherited, especially from the maternal side.[citation needed]