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Table 4 Proposed pelvic midpelvis and pelvic outlet measurements required for trial of breech birth

From: Magnetic resonance imaging in late pregnancy to improve labour and delivery outcomes – a systematic literature review

Midpelvis measurements

Minimum dimensions

Anteroposterior midpelvic distance

≥12·0 cm

Anteroposterior pelvic outlet

≥11·0 cm

Transverse midpelvic distance (interspinal distance)

≥9·5 cm

Transverse pelvic outlet (intertuberous distance)

≥10·5 cm

  1. Adapted from Van Loon et al. [25]