A treatise on the science and practice of midwifery . y of Pelvis is generally not Affected.—In most cases of thiskind the cavity of the pelvis is not diminished in size, and is ofteneven more than usually wide. The constant pressure on the ischia,which the sitting posture of the child entails, tends to force themapart, and also to widen the pubic arch. Considerable advantageresults from this in cases in which we have to perform obstetric ope-rations, as it gives plenty of room for manipulation. Figure-of-eight Deformity.—In a few exceptional cases the narrow-ing of the conjugate diameter is i
A treatise on the science and practice of midwifery . y of Pelvis is generally not Affected.—In most cases of thiskind the cavity of the pelvis is not diminished in size, and is ofteneven more than usually wide. The constant pressure on the ischia,which the sitting posture of the child entails, tends to force themapart, and also to widen the pubic arch. Considerable advantageresults from this in cases in which we have to perform obstetric ope-rations, as it gives plenty of room for manipulation. Figure-of-eight Deformity.—In a few exceptional cases the narrow-ing of the conjugate diameter is increased by a backward depressionof the symphysis pubis, which gives the pelvic brim a sort of figure- 1 Lectures on Obst. Operations, p. 280 DEFORMITIES OF THE PELVIS. 371 of-eight shape (Fig. 126). The most reasonable explanation of thispeculiarity seems to be, that it is the result of the muscular contrac-tion of the recti muscles, at their point of attachment, when thecentre of gravity of the body is thrown backwards, on account of Fig. Rickety Pelvis, with backward depression of the Symphysis Pubis. the projection of the sacral promontory. Sometimes also the antero-posterior diameter of the cavity is unusually lessened by the disap-pearance of the vertical curvature of the sacrum, which, instead offorming a distinct cavity, is nearly flat (Fig. 127). Fig. 127.
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