[The significance of the sacrum in labor: analysis of pelvic radiography in 300 cases].
D000328:Adult; D005260:Female; D006801:Humans; D007743:Labor, Obstetric; D010384:Pelvic Bones / Q000000981:diagnostic imaging*; D010387:Pelvimetry / Q000379:methods; D011247:Pregnancy; D011859:Radiography; D012447:Sacrum / Q000033:anatomy & histology*