. An American text-book of obstetrics. For practitioners and students. Fig. 301.—Effect of different inclinations ofthe pubis upon the relationship between thetrue and the diagonal conjugate diameter(Ribemont-Dessaignes). Fig. 302.—Effect of different thicknesses of the sym-physis upon the relationship between the true and thediagonal conjugate diameter (Ribemont-Dessaignes). pelvimeter. This distance is the diagonal conjugate. By the observation of DYSTOCIA. 505 many subjects, alive and dead, an agreement has been reached that If centi-meters should be subtracted from thediagonal conjugate to
. An American text-book of obstetrics. For practitioners and students. Fig. 301.—Effect of different inclinations ofthe pubis upon the relationship between thetrue and the diagonal conjugate diameter(Ribemont-Dessaignes). Fig. 302.—Effect of different thicknesses of the sym-physis upon the relationship between the true and thediagonal conjugate diameter (Ribemont-Dessaignes). pelvimeter. This distance is the diagonal conjugate. By the observation of DYSTOCIA. 505 many subjects, alive and dead, an agreement has been reached that If centi-meters should be subtracted from thediagonal conjugate to obtain the trueconjugate diameter. But the acceptanceof this average difference depends upon anormal height of the symphysis, 4 centi-. Fig. 303—Effect of different heights of thepromontory upon the relationship between thetrue and the diagonal conjugate (Ribemont-Des-saignes). Fig. 304— Effect of different heights of thesymphysis upon the relationship between the trueand the diagonal conjugate diameter (Ribemont-Dessaignes). meters, a normal angle between the axis of the pubis and the true con-jugate, 105°, a normal thickness of the symphysis, and a normal height ofthe promontory (Figs. 301-305).These factors, however, are notconstant, and if they vary muchfrom the normal the most skilfuland most experienced obstetricianmay be misled wofully in hisestimation of the true writer has had under his carea rachitic dwarf in whom therewas more than 3 centimeters dif-ference between the diagonal andtrue conjugates, and Pershingfound among 90 pelves in themuseums of Philadelphia a dif-ference varying from centi-meter to centimeters. It is j . , , Fig. 305.—Effect of the lessened slant outward of t
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectobstetrics, bookyear1
