Transverse diameter of the pelvic outlet is:
Transverse diameter of the obstetrical outlet / inter-ischial tuberous diameter - 10.5 cm An inter-ischial tuberous diameter of 8 cm or less is defined as a Contracted Outlet
9.5 cm
10.5 cm
11.5 cm
12.5 cm
Labour - normal, abnormal, malposition, malpresentation and their management