MR Obstetric Pelvimetry: Effect of Birthing Position on Pelvic Bony  Dimensions

Michel, Sven; Rake, Annett; Treiber, Karl; Seifert, Burkhardt; Chaoui, Rabih; Huch, R.; Marinček, Borut; Kubik‐Huch, Rahel A.

doi:10.2214/ajr.179.4.1791063

Cited by 74 publications

(46 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Interspinous distance may be overestimated if measurement on an axial slice at the level of the fovea, as the ischial spines are at this level in only 40–60% of women 12 . The bony dimensions of the maternal pelvis vary by up to 4 mm with change in posture 23,24 and also change during labour. Magnification errors occur at CT pelvimetry when the intended measurement is not at the isocentre of the CT gantry, with under or overestimate of measurements by up to 12 mm occurring 9 .…”

Section: Discussionmentioning

confidence: 99%

Measurement error in computed tomography pelvimetry

Anderson

Humphries²,

Wells³

2005

Australasian Radiology

View full text Add to dashboard Cite

Computed tomography pelvimetry is still used in clinical practice. We wished to quantify observer error in order to assess the level of confidence with which pelvic measurements can be described as adequate or inadequate. Anteroposterior inlet, anteroposterior outlet, transverse inlet and interspinous distances were measured from 11 CT pelvimetry examinations by five observers at one institution. Three CT pelvimetries were measured by five observers at a second institution. Intraobserver and interobserver variation was assessed using analysis of variance. Reliability of measurements was assessed using intraclass correlation coefficient. Combined error was calculated to determine 95% confidence limits for published minimum recommended pelvic measurements. The standard error of measurement, combining all sources, for measurement of the bony dimensions of the pelvis were: for anteroposterior inlet, 2.0 mm; anteroposterior outlet, 6.9 mm; transverse inlet, 1.3 mm; and interspinous distance, 2.1 mm. The 95% confidence interval around the recommended anteroposterior outlet of 100 mm was 88.5-111.3 mm. Observer variation in measurement of anteroposterior outlet is so large as to make the measurement of doubtful clinical utility.

show abstract

Section: Discussionmentioning

confidence: 99%

Measurement error in computed tomography pelvimetry

Anderson

Humphries²,

Wells³

2005

Australasian Radiology

View full text Add to dashboard Cite

show abstract

“…Mechanical dystocia and contracted pelvis are more likely to be implicated in obstructed labor. In recent years, there has been a renewed interest in studying internal and external obstetrical pelvimetry, concerning the diagnosis of dystocia from the contracted pelvis and operative delivery [2][3][4][5][6][7][8][9]. Lumbopelvic pain before and during pregnancy is a risk factor for mechanical dystocia in labor [10].…”

Section: Introductionmentioning

confidence: 99%

A Postural Approach to the Pelvic Diameters of Obstetrics: The Dynamic External Pelvimetry Test

Siccardi

Valle

Matteo

et al. 2019

Cureus

View full text Add to dashboard Cite

In recent years, there has been a renewed interest in internal and external pelvimetry, in relation to the diagnosis of dystocia from a "contracted pelvis." Dystocia is still one of the causes of maternal-fetal morbidity and mortality in the world. The main cause is the fetalpelvic disproportion, of which mechanical dystocia and contracted pelvis are most probably involved. Clinical pelvimetry was the diagnostic method of "contracted pelvis" and still seems to have its place in the clinical obstetric routine. Studies have been conducted in order to measure anatomical diameters and correlate them with operative or vaginal delivery. Some studies have been published regarding the diameters' variation with the shifting of the patient's posture. The positions used in the research for the analysis of changes in pelvis measurements are the same as those used for centuries to assist and promote childbirth. This technical report is to define a method of measuring changes in classical pelvimetric external diameters in relation to the postural change of the subjects, taking into consideration the needs of the operators, the postural difficulties of pregnant women and the evidence acquired from instrumental research. It aims to propose a dynamic postural method suited to daily practice, according to the directives and principles of the classical external obstetric pelvimetry.

show abstract

“…7,8 An increased pelvic diameter has been demonstrated in certain positions such as kneeling and squatting. 5,9 The aim of this literature review is to examine the available scientific evidence regarding the impact of birth positions on maternal and perinatal wellbeing and the factors that facilitate or inhibit women adopting various birth positions during the intrapartum period. For the purpose of this literature review, physiological birth positioning is defined as any clinical, social or cultural practice and/or environmental factor that facilitate women to use a variety of birth positions during the labour and birth, and minimises reliance on the supine birth positions.…”

Section: Introductionmentioning

confidence: 99%