Standardised Radiological Pelvimetry—Part IV

Examination of the course of labour in relation to variations in selected pelvic characteristics suggests that on the basis of pelvic mensuration alone a reasonably accurate prognosis of the probable mechanical course of labour can be offered in the majority of cases. From my own experience and from a limited review of the pertinent literature, the following table (Table VIII) is offered as a tentative guide to prognosis. The table is based on the assumption that the fœtal head is of fixed standard size, 100 mm. in diameter: if there is evidence that the head is smaller or larger than this assumed normal, the interpretation will require modification accordingly.