A system of obstetrics . body resting upon the ischial tuberosities,,and by the action of muscular traction, the former are more widelyseparated, and also the pubic rami, and the pubic arch is broadened. If the child walks during the disease, the pelvic deformity is greatlyincreased, there being superadded the changes caused by pressure uponthe acetabula. The parts adjacent to the acetabula are pressed intothe basin by the resistance of the heads of the femurs, and thus thesacro-cotyloid diameters are lessened. In consequence of the approachof the ilio-pubic tubercles the ischial spines are pr
A system of obstetrics . body resting upon the ischial tuberosities,,and by the action of muscular traction, the former are more widelyseparated, and also the pubic rami, and the pubic arch is broadened. If the child walks during the disease, the pelvic deformity is greatlyincreased, there being superadded the changes caused by pressure uponthe acetabula. The parts adjacent to the acetabula are pressed intothe basin by the resistance of the heads of the femurs, and thus thesacro-cotyloid diameters are lessened. In consequence of the approachof the ilio-pubic tubercles the ischial spines are pressed in the pelvis; 1 Transactions of the Edinburgh Obstetrical Society, vol. x. ANOMALIES OF THE PELVIS. 735 the approximation of the former causes a beaked protrusion of the pubicjoint. In the highest degree of the deformity the lumen of the pelvisis almost closed, and with bending of the sacrum and iliac bones thepelvis may take a triangular form, and is known as the pelvis triloba,or the pseudo-osteomalacic Pseudo-osteomalacic Pelvis (Mutter Museum, College of Physicians, Philadelphia). Turning from these graver deformities of the pelvis caused by rickets,we will now consider the diagnosis of the simply flat rachitic history of rickets is learned, and many of its obvious consequencesin other parts of the skeleton may be present. The distance betweenthe antero-superior iliac spines is equal to, possibly exceeds, that betweenthe iliac crests; the external conjugate is always lessened; the true con-jugate is shortened; in some instances the second sacral bone protrudesinto the pelvic cavity, making what is called the false promontory,and this may be more prominent than the true, when, of course, itbecomes one of the terminal points of the conjugata vera. The antero-posterior and transverse diameters of the outlet become unusually large-in comparison with the contraction at the inlet. The Mechanism of Labor in the Simple Flat and in the Rachitic FlatPelvis.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectobstetrics, bookyear1
