Platypelloid Pelvis Definition, Symptoms, Causes, Treatment

Learn all about Platypelloid pelvis definition, symptoms, causes and treatment. The platypelloid pelvis has an average anterioposterior, transverse and oblique diameter of 10.8cm, 14.4cm and 11.7cm respectively with an average brim index of 64%. The platypelloid pelvis is known to be suboptimal.

Women having a platypelloid pelvis tend to carry a lot of weight in the lower abdomen. It’s very difficult for these women to have really flat abdomens without getting body fat levels down into the single digits.

It has a kidney-shaped brim and the pelvic cavity is usually shallow and may be narrow in the antero-posterior (front to back) diameter. The outlet is usually roomy. During labour the baby may have difficulty entering the pelvis, but once in, there should be no further difficulty.

Many women are concerned that their pelvic capacity may be limited and that they will therefore have difficulty in giving birth. The true capacity of the pelvis will only be realised during labour. Only the forces created by mother and baby during birth will allow the pelvis to open to its full potential. This may take some time, but it is the only true way of exploring the “fit” between the mother and baby during birth.

Clinical pelvimetry is performed to some extent as part of labor care, from admission to the labor unit until the delivery of the fetus, and the clinical impression of adequacy is noted. Currently, it is the only routine evaluation method during labor to assess the adequacy of the maternal pelvis. Nonetheless, a trial of labor in the normal course is still the method of choice for determining whether a given fetus will be able to pass through a given pelvis.

Platypelloid Pelvis Definition, Symptoms, Causes, Treatment

What is Platypelloid Pelvis?

Platypelloid pelvis is the one shortened in the antero-posterior aspect, with a flattened transverse, oval shape. The transverse diameter exceeds the anterior diameter by 3cm or more. Brim oval transversely, Sacrum very slightly curved, Ischial spines prominent, short cone shallow pelvis, acute greater sciatic notch, Triangular obturator foramen, and wide arch narrow

Platypelloid Pelvis Definition

A platypelloid pelvis is flattened at the inlet and has a prominent sacrum. The sub pubic arch is generally wide but the ischial spines are prominent. This pelvis favors transverse presentations. Pelvic brim is transverse kidney shape. The Platypelloid pelvis is very short (almost like a “flattened gynecoid shape”).

Platypelloid Pelvis Symptoms

The pubic arch is a wide 4 finger span in the platypelloid that is quite wide. A woman’s hips may seem slightly wider side-to-side than her weight would demand.

In other words, a thin woman with a platypelloid pelvis has wide hips but her pelvis from front and back is quite narrow. Her sitz bones are quite wide apart, more than the width of her fist (if she can reach between them while lying down). Baby really needs to be in the lot position to get into the pelvic brim for engagement. Long early labor is common, but if baby isn’t lot, the two days of labor will be all about getting baby rotated and strong contractions and mobility are essential. Once baby is into the pelvis labor tends to move along, within 5-8 hours of engagement. Pushing may not be very long because the outlet of the pelvis is large. Using daily essentials: activities for pregnancy comfort & easier childbirth, and spinning babies’ parent class may help your baby get into a lot or other ideal position.

Platypelloid Pelvis Causes

Platypelloid pelvis is due to the wideness of sub pubic angle. It may be due to straight pelvic sidewalls and due to pushing of sacral promontory. Giving birth with this type of pelvis is associated with problems such as transverse arrest.

Platypelloid Pelvis Treatment

Platypelloid pelvis treatment is not specific. This pelvis is commonly associated with a high transverse arrest of labor due to the inability of the fetal head to navigate the inlet due to insufficient space from the anterior to posterior of the inlet. Normal vaginal birth is very uncommon with this pelvis. To assist childbirth with any type pelvis, the ligaments binding the pubic bones become more pliable due to the hormone “relaxin” made by the placenta. It allows the pelvis to enlarge by facilitating limited motion of the pubic symphysis. This is also a common source of pain in later pregnancy. The natural hormonal changes during pregnancy and birth create more joint and ligament flexibility in the pelvis. The hormone relaxin, which is responsible for relaxing and stretching these body parts, is more prevalent during pregnancy, birth, and postpartum. Variations in pelvic architecture must be carefully evaluated by the attending obstetric personnel.

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