The American text-book of obstetrics for practitioners and students . irmly set \ the pelvimeter having been boplaced that the indicator is turned toward the examiner, the measuremenf istherefore easily read off as soon a^ the pelvimeter is in proper position. Jtis on the average, in well-built women, 20^ centimeters. The best means for determining the length of the antero-posterior diameterof the pelvic inlet are the measurement taken from the lower edge of thesymphysis pubis to the promontory of the sacrum, the diagonal conjugatediameter, and the distance between the upper outer surface of t
The American text-book of obstetrics for practitioners and students . irmly set \ the pelvimeter having been boplaced that the indicator is turned toward the examiner, the measuremenf istherefore easily read off as soon a^ the pelvimeter is in proper position. Jtis on the average, in well-built women, 20^ centimeters. The best means for determining the length of the antero-posterior diameterof the pelvic inlet are the measurement taken from the lower edge of thesymphysis pubis to the promontory of the sacrum, the diagonal conjugatediameter, and the distance between the upper outer surface of the symphysis pubis and the pr >ntory of the sacrum. The diagonal conjugate diameter is one side of a triangle the other two sides of which are the height of the sym-physis and the true conjugate. The distance between the outer upper surfaceof the symphysis and the promontory of the sacrum differs from the true con-jugate by the thickness of the upper portion of the symphysis. Smellie wasaccustomed to estimate roughly the length of the true conjugate by a digital. Fig. 7.—Steins instrument for direct measurement of the conjugate. examination, basing his estimate on the ease with which the promontory couldbe reached. In the latter part of the eighteenth century Johnson proposed forestimating the size of the pelvic inlet a method which consisted in insertingthe fingers of one hand in the mouth of the womb and then spreading thembetween the promontory and the sacrum. A few years later the eldn- Steindevised a graduated rod for measuring the distance between the lower edge ofthe symphysis pubis and the division between the second and third sacralvertebrae. This distance he believed to be \ to 1 inch greater than the trueconjugate. Stein later constructed the instrument for the direct measurementof the conjugate shown in Figure 7. Many instruments have since beenconstructed on this principle, but they are impracticable in the living female,for obvious reasons. Baudelocque was th
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectobstetrics, bookyear1
