CLINICAL STUDIES OF THE SHAPE OF PELVIC BONE ON THE X-RAX FILM : Chiefly on the pelvic inlet and greatest pelvic dimensions
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概要
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Roentogen-pelvimetry was perfomed on the lateral view (Guthmann's method) and the inlet view (Martiu's method) in 2502 pregnant women, and the studies on the relationship between the morphology of the pelvis and the process of the delivery was done upon observing morphology of the secrum and the inlet of the pelvis.<BR>1. The sacra were classified into five groups and fourten types. The frequency of arc type was 67.9 per cent, flat type, 18.7 navicular type, 5.4 the second promontorium (double promontorium) type, 4.4 and intermediate type, 3.6 The frequency of long pelvis was 17.5 per cent, tubular pelvis, 4.4 and funnel pelvis, 6.3.<BR>2. The morphological classification of the inlet was performed according to that of Caldwell. The frequency of pure gynecoid type was 75.3 per cent, pure android type, 0.7, pure anthropoid type, 3.1 and pure platypeloid type, 4.0.<BR>3. The caesarean section were more frequenty performed when the sacra were navicular or flat type or when the inlet of the pelvis was platypeloid. The vacuum extraction deliveries were frequently performed in case of funnel pelvis.<BR>4. The limiting value for the caesarean section of the conjugate vera was 10.0 cm, that of inlet angle of the pelvis over 150°, that of the opening angle of the pelvis less than 69° and that of transverse diameter of the inlet less than 11.0 cm.<BR>5. The limiting values for the caesarean section were larger in pelvic presentation than in cephalic presentation.<BR>6. The pelvic-fetal weight index was calculated from the size of the pelvis and the weight of the fetus. The pelvic-fundus uteri index was calculated from the size of pelvis and the hight of the fundus uteri. Comparison of the process of the delivery with these values was studied.<BR>7. The abnormal morphology of pelvic diameter were noted in each case of the abnormal presentation and rotation.