A treatise on the science and practice of midwifery . h as increased pressure of the trunk from carry-ing weights in early childhood and the like. By this means the sacrumis unduly depressed and projects forward, so as to slightly narrow theconjugate diameter. Mode of Production in Rickets.—When caused by rickets, the amountof the contraction varies greatly, sometimes being very slight, sometimessufficient to prevent the passage of the child altogether, and to mtate craniotomy or the Csesarean section. The sacrum, softened by thedisease, is pressed vertically downward by the weight of the body
A treatise on the science and practice of midwifery . h as increased pressure of the trunk from carry-ing weights in early childhood and the like. By this means the sacrumis unduly depressed and projects forward, so as to slightly narrow theconjugate diameter. Mode of Production in Rickets.—When caused by rickets, the amountof the contraction varies greatly, sometimes being very slight, sometimessufficient to prevent the passage of the child altogether, and to mtate craniotomy or the Csesarean section. The sacrum, softened by thedisease, is pressed vertically downward by the weight of the body, its de-scent being partially resisted by the already ossified portions of the bone,so that the result is a downward and forward movement of the promon-tory. The upper portion of the sacral cavity is thus directed more back-ward ; but, as the apex of the bone is drawn forward by the attachmentof the perineal muscles to the coccyx and by the sacro-ischiatic ligaments,a sharp curve of its lower part in a forward direction is established. Fig-. Scolio-rachitic Pelvis. (From a specimen in the Museum of Si. Bartholomews Hospital.) Occasional Increase of Transverse Diameter.—The depression ( thesacra] promontory would tend to produce strong traction, through thesacro-iliac ligaments, on the posterior end of the sacro-cotyloid beams, andthus induce expansion of the iliac bones and consequent increase of tli<• expected, on accounlof the imperfect development of the bones generally accompanying rick-ets; and Barnes1 says that in the parts of London where deformities aremost rife any enlargement of the transverse diameter i- exceedingly rare. 1 Lectures on Obst. Operatu 380 LABOR. The Scolio-rachitic and Scoliotic Pelvis.—Frequently the sacrum is notonly depressed, but displaced more or less to one side, most gen
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectobstetrics, bookyear1
