Pelvimetry
Author:
Mikael Häggström [notes 1]
Contents
Planning
- Indication
A review in 2003 considered routine performance of pelvimetry to be a waste of time, a potential liability, and an unnecessary discomfort.[1] A woman's pelvis loosens up before birth by hormones, so an investigation before labor do not represent the physiologic capacity of the birth canal. Still, pelvimetry can be indicated when a woman has had failure to progress in a previous pregnancy.
- Choice of investigation
Low-dose 3D CT can be used for estimating pelvimetry parameters.[2]
Interpretation
| Parameter | Image (maximum intensity projection) |
Definition | Normal measures | |
|---|---|---|---|---|
| Pelvic inlet | Transverse diameter of the pelvic inlet | 170px | 13 to 14.5 cm.[2] | |
| Obstetric conjugate | 120px Median plane |
The line between the narrowest bony points formed by the sacral promontory and the inner pubic arch | 10 to 12 cm.[2] | |
| Interspinous distance | 170px | The line between the narrowest bone points connects the ischial spines | 9.5 to 11.5 cm.[3] | |
| Pelvic outlet | Sagittal pelvic outlet diameter¨ | 120px | 9.5 to 11.5 cm.[3] | |
| Intertuberous diameter | 150px | 10 to 12 cm.[3] | ||
Report
The length of each of the distances above, and a mention of whether any is decreased.
References
- ↑ "A retrospective review of performance and utility of routine clinical pelvimetry ". Family Medicine 36 (7): 505–7. 2004. PMID 15243832.
- ↑ 2.0 2.1 2.2 "Pelvimetry by Three-Dimensional Computed Tomography in Non-Pregnant Multiparous Women Who Delivered Vaginally ". Polish Journal of Radiology 81: 219–27. 2016. doi:. PMID 27231494.
- ↑ 3.0 3.1 3.2 "Magnetic resonance pelvimetry for trial of labour after a previous caesarean section ". Sultan Qaboos University Medical Journal 10 (2): 210–4. August 2010. PMID 21509231.
Cite error: <ref> tags exist for a group named "notes", but no corresponding <references group="notes"/> tag was found, or a closing </ref> is missing
