A textbook of obstetrics . imation of the tuberosities of the ischia, the depth of the pelvis, and the direction of itscanal ; by detecting, possibly, thepresence of an exostosis, an osteo-sarcoma, an abnormally project-ing spinous process, an old frac-ture, or asymmetry of the pelvicwalls from any cause. Measurement of the Trans-verseDiameter of the Pelvic Outlet.—Theanteroposterior diameter of the in-ferior strait is enlarged during laborby tin- displacement backward ofthe coccyx. The transverse diam-Fig of the eter betweeil the tuberosities ofanteroposterior diameter i the
A textbook of obstetrics . imation of the tuberosities of the ischia, the depth of the pelvis, and the direction of itscanal ; by detecting, possibly, thepresence of an exostosis, an osteo-sarcoma, an abnormally project-ing spinous process, an old frac-ture, or asymmetry of the pelvicwalls from any cause. Measurement of the Trans-verseDiameter of the Pelvic Outlet.—Theanteroposterior diameter of the in-ferior strait is enlarged during laborby tin- displacement backward ofthe coccyx. The transverse diam-Fig of the eter betweeil the tuberosities ofanteroposterior diameter i the pel- ... vie outlet. the ischiatic bones is constant, and if there is contraction of the outletthe- greatest resistance to the- escape of the fetus is furnished bythese firm bony eminences. The transverse diameter of the pelvicoutlet can be: measured directly with ease. The woman is placedin the dorsal posture, with thighs and legs flexed. The distancebetween the tuberosities of the ischia is measured with a pel-. AXOMALIES IN THE FORCES OF LABOR. 423 vimeter, or the examining physician places his thumbs squarely on the tuberosities, and an assistant measures the distance be-tween the physicians thumb-nails. If it should be desired to measure the anteroposterior diam-eter of the pelvic outlet, this may be done as is shown in figure283, centimeters being subtracted for the thickness of boneand superimposed structures. Or, the extended first and secondfinder of the left hand may measure the distance from the loweredge of the symphysis pubis to the tip of the sacrum. 4. Description of the Several Varieties of Abnormalitiesin the Female Pelvis.—The simple flat pelvis (Fig. 282) is theearliest recognized form of contracted pelvis—the pelvis planaof Deventer, who did not, however, make a distinction betweenthe simple flat and the rachitic flat pelvis. It is doubtful, indeed,if he knew the differencebetween the two. Betschlerwas the first to point out thedistinctive features
Size: 1577px × 1584px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookidtex, booksubjectobstetrics
