A textbook of obstetrics . tors : the pressure from the trunk aboveand the counterpressure from the extremities below; the pullon the pelvic bones by ligaments and muscles; and an arresteddevelopment. Characteristics.—The effect upon the shape and size of thepelvic canal of rachitis in the pelvic bones is not varieties of contracted pelvis may result. The com-monest is the flat pelvis with some contraction of all the diam-eters, but a most marked diminution in the antcropcdiameter (Ficommon form, a simple tenor 94). There may be found, in addition to thisHat rachitic pelvis wit
A textbook of obstetrics . tors : the pressure from the trunk aboveand the counterpressure from the extremities below; the pullon the pelvic bones by ligaments and muscles; and an arresteddevelopment. Characteristics.—The effect upon the shape and size of thepelvic canal of rachitis in the pelvic bones is not varieties of contracted pelvis may result. The com-monest is the flat pelvis with some contraction of all the diam-eters, but a most marked diminution in the antcropcdiameter (Ficommon form, a simple tenor 94). There may be found, in addition to thisHat rachitic pelvis without alteration ol the transverse diameters, a equally contracted rachitic- ANOMALIES IN THE FORCES 01 LAI 44 I pelvis (Fig. 295), and a so-called pseudo-osteomalacic pelvis,in which the effect seen in osteomalacia is produced by pressureupon the hones softened by rachitis. There are other rareforms of asymmetrical development, in connection usually withspinal disease of rachitic origin, that will he described Fig. 295.—Generally equally contracted rachitic pelvis (authors collection). Characteristics of the Flat, Generally Contracted RachiticPelvis.—The sacrum is pressed forward and downward betweenthe iliac bones, and is rotated on its transverse axis, mainly bythe pressure of the trunk upon it, but partly by the pull down-
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Keywords: ., bookcentury1800, bookdecade1890, bookidtex, booksubjectobstetrics
