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Related to interspinous diameter: intertuberous diameter
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"In the typical case of prolapse, the rectovaginal septum is detached from its connections within the interspinous diameter and displaced downward.
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).
Although few women will be physically capable of switching through several positions while giving birth, the theoretical ideal would thus be to adopt the hand-to-knee position to help the presenting part through the interspinous diameter, and to squat rather than remain supine as the part traverses the sagittal outlet, said Dr.