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.
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.
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.
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.
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.
5. The limiting values for the caesarean section were larger in pelvic presentation than in cephalic presentation.
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.
7. The abnormal morphology of pelvic diameter were noted in each case of the abnormal presentation and rotation.

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Morphological studies of pelvic shape were examined on 2250 cases of primi-and multigravid women by the X-ray film of pubic arch, lateral shape and inlet of pelvis. Also, course of delivery with regard to the pelvic contration and outlet were scrutinized statistically.
Morphological findings.
Findings of the pelvic arch were classified in 5 types, i. e. wide form, regular or standard form, moderately and extremely narrow and sharp triangle form, obtaining 16.7 %, 62.7 %, 15.1 % 4.0 % and 1.5 % in order.
Shape of sacrum and pelvic inlet were classified by the methods of Guthmann and Martius.
The wide form of pelvic arch is related to the platypelloid type of inlet statistically, regular form to gynecoid type and narrow formed to anthropoid type.
High incidence of abnormality of sacral shape were found in the group of narrow typed pelvic arch. Increased pelvic depth were often observed in subjects with linear sacrum, second promontory pelvis and long pelvis.
Mean and deviation of varying conjugation, angle and area of pelvic contraction and outlet were obtained by the measurement of pelvic arch on 796 cases of primigravid women and of lateral side of pelvis on 1123 cases.
It seemed to be high in frequency in subjects with aged over 30 years old and with less than 150 cm of height.
Following correlations were obtaind by the measurement, the height to intertuberous distance and subpubic angle, the intertuberous distance to the one between the great trochanters and also between the crista by external pelvinetry, intertuberous distance to obstetrical true conjugate, the sidest transverse diameter of the inlet, the anteroposterior diameter of the midplane and posterior sagittal contraction, the subpubic angle to the available anteroposterior diameter of the pelvic outlet and the latter one to the anteroposterior diameter of the pelvic contraction. The negative correlation was obtained between the subpubic angle and pelvic depth.
Findings related to the clinical aspects.
Studies on relationship between the shape of pelvic arch and course of labor were investigated in 1040 cases of primigravid vertex presentation.
Caesarian section, vacuum delivery and forceps labor were found to be high in incidence in the group of narrow typed pelvic arch. In 72 cases with primigravid breech presentation, it seemed to be necessary to perform caesarian section generally, when those showed similar shape. Much longer time for second stage of delivery in above subjects were required than those with regular form.
Lowest point for incidence as to occurrence of abnormal delivery was figured out upon measuring the varying conjugation, angle and area of pelvic contraction and outlet.
It is rather significant to evaluate the process of delivery by the size of fetus in addition to the size and shape of pelvis. Therefore, pelvis-fetus index and pelvis uterine height index was figured out by the size of fetus and pelvis, and obtained the lowest point for incidence of abnormal delivery.
Further more, morphological studies of pelvis were performed in subjects with abnormality of fetal attitude and rotation and with post -morten delivery.

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