A textbook of obstetrics . nd the rachitic flat pelvis. It is doubtful, indeed,if he knew the differencebetween the two. Betschlerwas the first to point out thedistinctive features of this formof pelvis. In Europe it is thecommonest variety of de-formed pelvis. Schroder statesthat it is seen more frequentlythan all the other forms puttogether. In America it isalso common, but the equallygenerally contracted pelvis isencountered here as often orperhaps oftener. Out of aseries of 316 pelves in womenof American birth, I havefound eighteen (a percentage of ) with the measurements characteristic
A textbook of obstetrics . nd the rachitic flat pelvis. It is doubtful, indeed,if he knew the differencebetween the two. Betschlerwas the first to point out thedistinctive features of this formof pelvis. In Europe it is thecommonest variety of de-formed pelvis. Schroder statesthat it is seen more frequentlythan all the other forms puttogether. In America it isalso common, but the equallygenerally contracted pelvis isencountered here as often orperhaps oftener. Out of aseries of 316 pelves in womenof American birth, I havefound eighteen (a percentage of ) with the measurements characteristic to some degree of asimple flat pelvis. Characteristics.—In the simple flat pelvis the sacrum is smalland is pressed downward and forward between the iliac bones,but is not rotated forward on its transverse axis. The antero-posterior diameter is contracted, therefore, throughout the wholeof the pelvic canal. The contraction, however, is not oftengreat. It is scarcely ever below 8 and is usually not Fig. 282.—Simple flat pelvis : C. v.,%yz cm. ; tr., 13 ^ cm.; obi., 123/ (model in authors collection, Universityof Pennsylvania). 1 The abbreviations, c. v., /;-., and obi., will be used throughout to designate thetrue conjugate, the transverse, and oblique diameter- of tin- pelvic inlet. 2 Kngelken has described a specimen with a true conjugate of centimeters,a diagonal conjugate of centimeters, with transverse and obli |ue diameters of theinlet and centimeters respectively. This specimen is unique. 424 THE PA ///()L OGY t>/? LABOR. The transverse diameter is as great as, or possibly greaterthan, that of the normal pelvis. Occasionally, however, in pelvesapproaching the type of the generally contracted flat pelvis thetransverse diameter may be found somewhat diminished. Thereis in these pelves quite frequently a double promontory formedby the abnormal projection of the cartilaginous junction betweenthe first and second sacral ver
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