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CHICAGO -- Upright birthing positions provide significantly more room for delivery in terms of pelvic dimensions, compared with lying supine, Dr. Thomas Keller said at the annual meeting of the Radiological Society of North America.
He and his colleagues at University Hospital, Zurich, Switzerland, performed MR pelvimetry on 35 nonpregnant women to compare pelvic bony dimensions in the supine, hand-to-knee, and squatting positions.
T1 gradient echo sequences were taken to compare the positions in terms of the obstetric conjugate, sagittal outlet, and the interspinous, intertuberous, and transverse diameters.
At the sagittal outlet, both the hand-to-knee and squatting positions provided significantly more room than the supine position (11.8 degrees, 1.3 cm; 11.7 degrees, 1.3 cm; and 11.5 degrees, 1.3 cm, respectively).
Similarly, the hand-to-knee (11.6 degrees, 1.1 cm) and squatting (11.7 degrees, 1.0 cm) positions provided more room for delivery at the interspinous diameter compared with the supine position (11.0 degrees, 0.7 cm).
The intertuberous diameter ...