A textbook of obstetrics . e latter are pulledoutward and forward so that the pubic arch is greatly widened 444 TIIE r-l THOLOGY OF LABOR. and the transverse diameter of the pelvic outlet is anteroposterior diameter oi the outlet is somewhat dimin-ished by the excessive perpendicular curvature of the sacrum,but the contraction is relatively much less than in the conjugate of the inlet. The whole pelvis is tilted forward on its transverseaxis, so that the inclination of the superior strait is increasedand the external genitalia are displaced backward. The bones of a rachitic pelvi
A textbook of obstetrics . e latter are pulledoutward and forward so that the pubic arch is greatly widened 444 TIIE r-l THOLOGY OF LABOR. and the transverse diameter of the pelvic outlet is anteroposterior diameter oi the outlet is somewhat dimin-ished by the excessive perpendicular curvature of the sacrum,but the contraction is relatively much less than in the conjugate of the inlet. The whole pelvis is tilted forward on its transverseaxis, so that the inclination of the superior strait is increasedand the external genitalia are displaced backward. The bones of a rachitic pelvis are usually slighter and morebrittle than common. They may, perhaps, show no peculiaritiesin structure, or in rare eases they may be found much thickerand heavier than normal. In the generally equally contracted rachitic pelvis—a raretype—is seen mainly an arrest of development, the consequenceof rachitis in very early life, which retarded growth withoutmuch affecting the shape of the pelvic inlet and canal, from the. Fig. 299.—Pseudo-osteomalacic pelvis. fact that the pelvis had not been subjected to the pressure of thetrunk during the active stage of the disease, because it ran itscourse to complete recovery before the child attempted to sit upor to walk. Possibly, also, the disease in some of these cases isnot severe and lasts but a short time. As the: deformity is theresult of arrested development, a transverse contraction is foundas in the fetal ill-developed pelvis. The diagnosis of tin- rachitic origin ofthis type of pelvis ismade by the relations of iliac spines to crests, perhaps by thehistory of rachitis in earl)- infancy, and possibly by tin- signs oithe disease in other portions of the body. In the pseudo-osteomalacic pelvis (Fig. 200) tin- rachitis hasprogressed to an extreme degree and has been long to walk have been made while tin- disease was inactive ANOMALIES IX THE FORCES OF LABOR. 445 progress, and possibly the weight of the trunk h
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Keywords: ., bookcentury1800, bookdecade1890, bookidtex, booksubjectobstetrics
