Elements of the principles and practice of midwifery . 322 DEFORMITY OP THE diameter is contracted, it is due (except in some cases of exostosis)not to compression inward of the sacro-iliac joint, but to that of thesacral promontory or the cotyloid cavity. This instrument may be employed also in measuring the pelvisexternally, but its application in this case is too simple to require farther explanation. (Seefig. 26.) Though the em-ployment of a properlyconstructed instrument,like the above, shouldnever be neglected, stillmanual exploration offersmuch more accurate re-sults in determi
Elements of the principles and practice of midwifery . 322 DEFORMITY OP THE diameter is contracted, it is due (except in some cases of exostosis)not to compression inward of the sacro-iliac joint, but to that of thesacral promontory or the cotyloid cavity. This instrument may be employed also in measuring the pelvisexternally, but its application in this case is too simple to require farther explanation. (Seefig. 26.) Though the em-ployment of a properlyconstructed instrument,like the above, shouldnever be neglected, stillmanual exploration offersmuch more accurate re-sults in determining theform and capacity of thepelvis. This knowledgecan be obtained by introducing the index finger into the vagina,and passing it upward for the purpose of reaching the sacral pro-montory. In making this examination, the female should be madeto stand erect, with her shoulders firmly placed against the wall,or some other plane surface. If the index finger be introducedinto the vagina, and carried upward and backward, it will sooncome in contact with the sacral promontory. When
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