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

Sven C. A. Michel1, Annett Rake2, Karl Treiber1, Burkhardt Seifert3, Rabih Chaoui2, Renate Huch2, Borut Marincek1 and Rahel A. Kubik-Huch1,4

1 Institute of Radiology, University Hospital, Rämistra. 100, 8091 Zürich, Switzerland.
2 Clinic of Obstetrics, University Hospital, 8091 Zürich, Switzerland.
3 Department of Biostatistics, University of Zurich, Sumatrastr. 30, 8006 Zürich, Switzerland.
4 Present address: Institute of Radiology, Cantonal Hospital Baden, CH-5404 Baden, Switzerland.



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  		Fig. 1A. —MR pelvimetry in vertical open configuration magnet system. (Drawings by Roth P) Photograph shows female volunteer in hand-to-knee position (rear view).

 


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  		Fig. 1B. —MR pelvimetry in vertical open configuration magnet system. (Drawings by Roth P) Drawing illustrates patient in hand-to-knee position in labor.

 


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  		Fig. 1C. —MR pelvimetry in vertical open configuration magnet system. (Drawings by Roth P) Photograph shows female volunteer in squatting position (lateral view).

 


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  		Fig. 1D. —MR pelvimetry in vertical open configuration magnet system. (Drawings by Roth P) Drawing illustrates patient in squatting position in labor.

 


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  		Fig. 2A. —Pelvimetric diameters. (Drawings by Roth P) Drawings show interspinous diameter (A), transverse diameter (B), intertuberous diameter (C), and obstetric conjugate and sagittal outlet (D).

 


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  		Fig. 2B. —Pelvimetric diameters. (Drawings by Roth P) Drawings show interspinous diameter (A), transverse diameter (B), intertuberous diameter (C), and obstetric conjugate and sagittal outlet (D).

 


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  		Fig. 2C. —Pelvimetric diameters. (Drawings by Roth P) Drawings show interspinous diameter (A), transverse diameter (B), intertuberous diameter (C), and obstetric conjugate and sagittal outlet (D).

 


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  		Fig. 2D. —Pelvimetric diameters. (Drawings by Roth P) Drawings show interspinous diameter (A), transverse diameter (B), intertuberous diameter (C), and obstetric conjugate and sagittal outlet (D).

 


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  		Fig. 3A. —T1-weighted MR images show pelvimetric diameters in 24-year-old woman from nullipara group. MR images obtained in supine position show interspinous (A) and intertuberous (B) diameters.

 


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  		Fig. 3B. —T1-weighted MR images show pelvimetric diameters in 24-year-old woman from nullipara group. MR images obtained in supine position show interspinous (A) and intertuberous (B) diameters.

 


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  		Fig. 3C. —T1-weighted MR images show pelvimetric diameters in 24-year-old woman from nullipara group. MR images obtained in hand-to-knee position show interspinous (C) and intertuberous (D) diameters.

 


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  		Fig. 3D. —T1-weighted MR images show pelvimetric diameters in 24-year-old woman from nullipara group. MR images obtained in hand-to-knee position show interspinous (C) and intertuberous (D) diameters.

 


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  		Fig. 3E. —T1-weighted MR images show pelvimetric diameters in 24-year-old woman from nullipara group. MR images obtained in squatting position show interspinous (E) and intertuberous (F) diameters.

 


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  		Fig. 3F. —T1-weighted MR images show pelvimetric diameters in 24-year-old woman from nullipara group. MR images obtained in squatting position show interspinous (E) and intertuberous (F) diameters.

 


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  		Fig. 4. —Graph shows mean values of obstetric conjugate; sagittal outlet; and interspinous, intertuberous, and transverse diameters (cm) in three positions.

 


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  		Fig. 5. —Box plot of pelvimetric differences in changing from supine to hand-to-knee (first bar in each set) to squatting (second bar in each set) positions. OC = obstetric conjugate, SO = sagittal outlet, ISD = interspinous diameter, ITD = intertuberous diameter, TD = transverse diameter.

 

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