A System of midwifery : including the diseases of pregnancy and the puerperal state . Rachitic pelvis. weight of the whole trunk is thus transmitted to the heads of the thigh-bones. This difference in the nature of the forces or mechanism ofpelvic deformity Is well shown in the characteristic features of rachitican 1 malacosteon pelves. In a typical case of the former variety thereis, a- shown in Fig. L88, a marked projection forwards of the sacrumby the operation of the cause above alluded to This i- by far the mostfrequent of all the varieties of deformity which have been may (a
A System of midwifery : including the diseases of pregnancy and the puerperal state . Rachitic pelvis. weight of the whole trunk is thus transmitted to the heads of the thigh-bones. This difference in the nature of the forces or mechanism ofpelvic deformity Is well shown in the characteristic features of rachitican 1 malacosteon pelves. In a typical case of the former variety thereis, a- shown in Fig. L88, a marked projection forwards of the sacrumby the operation of the cause above alluded to This i- by far the mostfrequent of all the varieties of deformity which have been may (as sh<»wn in the figure i or mav Dot be associated with Batten-ing of the anterior wall, and projection backwards of the symphysis 440 DEFORMITIES OF THE PELVIS. [chap. pubis, but the effect, in every ease, is a more or less marked diminu-tion of the conjugate diameter of the brim. Different varieties of thisdistortion have been described as masculine, heart-shaped, andfigure of eight deformities of the brim ; all of which are, as will be Fig. Malacosteou pelvis. observed, mere modifications of the same condition, and all of whichpartake of the character of elliptical distortion. In malacosteon again,the general characteristic of the deformity is annular, and is due toantero-lateral displacement of the pelvic walls by pressure exercisedupon the acetabula. This is indicated in a typical form by the rostratedvariety shown in Fig. 139, where the conjugate diameter is increasedat the expense of the transverse and oblique. Endless varieties and combinations of these two may occur, so thatthe distinction between a rickety and a malacosteon pelvis is only to be F13. 149.
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectobstetrics, bookyear1
