After the surgical procedures are completed, the divided uterine walls are brought together with sutures and the vagina is then replaced and sutured. In my experience, a certain amount of preliminary dilatation of the cervix facilitates this operation. (See Figs. 38-41.) The remaining instruments in the examiner's kit will be described in subsequent chapters on urethra, bladder, ureters, and rectum examination.
Pelvimetry is crucial for women concerned about pelvic deformities affecting childbirth. B.C. Hirst notes that deformed pelves occur in approximately seven percent of white urban women but are less common among the upper classes and rural populations. A reliable tape measure and pelvimeter are essential tools for accurate measurements, including antero-posterior diameter, capacity, transverse diameter, and oblique diagonal diameters.
<Callout type="important" title="Essential Tools">A pelvimeter is a large pair of calipers with a scale divided into centimeters and inches. It is crucial for measuring the pelvic dimensions accurately.</Callout>
The external conjugate diameter measures 8 inches (20.5 cm) or more, indicating normal or large pelvises; less than this suggests an antero-posterior contracted pelvis. The oblique conjugate diameter can be measured by examining the woman in a dorsal position and using two fingers to mark points for measurement.
<Callout type="risk" title="Measurement Risks">Care must be taken not to mistake the last lumbar vertebra for the first sacral vertebra when measuring.</Callout>
The transverse diameter is inferred from measurements of the iliac bones, and the capacity of the pelvic cavity can be estimated through vaginal examination. The oblique diagonal diameters are measured with the patient lying on one side and then the other.
<Callout type="beginner" title="Understanding Pelvimetry">Beginners should familiarize themselves with the anatomy and landmarks to ensure accurate measurements.</Callout>
Key Takeaways
- Pelvimetry is essential for assessing pelvic deformities that may affect childbirth.
- A pelvimeter and reliable tape measure are necessary tools for accurate measurements.
- Understanding the anatomy of the pelvis is crucial for proper measurement techniques.
Practical Tips
- Ensure preliminary dilatation of the cervix to facilitate surgical operations.
- Use a pelvimeter to accurately measure pelvic dimensions.
- Familiarize yourself with anatomical landmarks for precise measurements.
Warnings & Risks
- Incorrect identification of vertebrae can lead to inaccurate measurements.
- Pelvic deformities are more common in urban populations and among certain racial groups.
Modern Application
While the specific medical procedures described here have evolved, understanding pelvic measurement techniques remains crucial for assessing childbirth risks. Modern tools and imaging technologies enhance accuracy but the foundational knowledge of pelvimetry is still valuable.
Frequently Asked Questions
Q: What are the most common forms of pelvic deformities?
The most common forms include simple flat pelvis, generally equally contracted pelvis (justo-minor), and generally contracted flat pelvis. These conditions are typically due to faulty skeletal development.
Q: How do you measure the external conjugate diameter?
To measure the external conjugate diameter, place one end of the pelvimeter in the depression just below the last spine and the other point on the anterior upper margin of the symphysis pubis.
Q: Why is it important to distinguish between lumbar and sacral vertebrae?
Distinguishing correctly prevents measurement errors, as mistaking the last lumbar for the first sacral vertebra can lead to inaccurate pelvic measurements.