. The science and art of midwifery. ed. The Mnece ilio-pectinew areonly slightly curved. The sub-pubic arch is narrowed. The spinesand tuberosities of the ischia are abnormally approximated. Owingto the narrowness of the sacrum, the posterior superior iliac spines arein close proximity to each other, while the spines and crest of theilium are more remote than in a normal pelvis. The venters of theilia are expanded and directed to the front. The transverse diameterof the false pelvis is, therefore, increased, while that of the true pelvisis diminished. The symphysis is prominent, the horizontal
. The science and art of midwifery. ed. The Mnece ilio-pectinew areonly slightly curved. The sub-pubic arch is narrowed. The spinesand tuberosities of the ischia are abnormally approximated. Owingto the narrowness of the sacrum, the posterior superior iliac spines arein close proximity to each other, while the spines and crest of theilium are more remote than in a normal pelvis. The venters of theilia are expanded and directed to the front. The transverse diameterof the false pelvis is, therefore, increased, while that of the true pelvisis diminished. The symphysis is prominent, the horizontal pubic ramimeeting at an acute angle. At the inlet the oblique and the conjugatediameters are elongated and the transverse diameter curtailed. In thetrue pelvis the transverse diameters are considerably, and the antero-pos-terior diameter slightly shortened. These diameters become still more * Lange, Arch. f. Gynaek., Bd. i, 1870, p. 231. f Spiegelberg, Lehrbuch, p. 483. % Breslau, Monatsschr. f. Geburtsk., Bd. xxvii, 1866, p. 510 THE PATHOLOGY OF LABOR. contracted as the outlet is approached.* If a lumbo-sacral kyphosis bepresent, the sacrum is shortened and very narrow. If this kyphosis besituated very low down, it may be compensated for by a low lumbarlordosis, which overhangs and materially contracts the pelvic inlet, f Etiology.—The cause of the spinal curvature resulting in kyphoticpelvis is usually caries of the vertebrae. J Diagnosis.—The antecedent history and the discovery of kyphosiswill render the existence of this form of pelvis probable. On morecareful physical examination, the shape and position of the sacrum,the short interval between the spines and the tuberosities of the is-chium and the posterior superior iliac spines, the wide separation of theanterior superior iliac spines, the narrow pubic arch and prominentsymphysis, the flatness of the iliac venters, and the difficulty experi-enced in reaching the promontory, will establish the diagnosis. Thedi
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