A textbook of obstetrics . ocal-ized necroses of the softtissues following labor inthe justominor pelvis, thereis greater likelihood ofrupturing pelvic joints inthis than in any othervariety of contracted pel-vis, and there is also anextraordinary liability to eclampsia (Fig. 287). The caput succedaneum, which is verylarge on account of the early fixation of the head and the longlabor, is situated directly over the smaller fontanel. There isan overlapping of the cranial bones, both laterally and antero-posteriorly. The generally contracted, flat, nonrachitic pelvis presents thecombined feature
A textbook of obstetrics . ocal-ized necroses of the softtissues following labor inthe justominor pelvis, thereis greater likelihood ofrupturing pelvic joints inthis than in any othervariety of contracted pel-vis, and there is also anextraordinary liability to eclampsia (Fig. 287). The caput succedaneum, which is verylarge on account of the early fixation of the head and the longlabor, is situated directly over the smaller fontanel. There isan overlapping of the cranial bones, both laterally and antero-posteriorly. The generally contracted, flat, nonrachitic pelvis presents thecombined features of the flat and the generally contracted pelvis. Characteristics.—All the diameters are below normal, butthe conjugate is less in proportion than any of the others. Thispelvis has many of the features of a rachitic pelvis, but theanterior half of the pelvic circumference is not markedly broad-ened ; indeed, it is often the reverse. The sacrum is small andis not rotated on its transverse axis ; it is placed further back. Pig. 287.—Justominor pelvis with rup-tured pelvic joints, following forceps applica-tion : C. v., 9^4 cm. ; tr., 12^ cm.; obi.,113^ cm. (authors collection). 432 THE PA THOL OGY OF LABOR. between the innominate bones than in the normal pelvis, andvery much further back than in the rachitic pelvis. The pro-montory is high and is not prominent. The influence of thisdeformity of the pelvis upon labor is that of a flat pelvis, but thedifficulties are greater than in the case of the simple flat pelvis,for there is less compensatory room in a transverse generally contracted, non-rachitic, flat pelvis is comparativelyrare. The flattening, according to Litzmann, is due to a short-ening of the innominate bones, especially at the iliopectinealline. In estimating- the true conjugate diameter of the generallycontracted flat pelvis it is safer to subtract 2 instead of I 3^ cen-timeters from the diagonal conjugate, on account of an increasein the conjugato
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Keywords: ., bookcentury1800, bookdecade1890, bookidtex, booksubjectobstetrics
