. A treatise on obstetrics for students and practitioners . b and Anger rest just above the termination ofeach limb of the pelvimeter. He should remember to take his measure-ments from the outer side of each landmark upon the ilia. There is no 44 PREGNANCY AND LABOR. good reason for this injunction, except the fact that such is usage, andthat the measurements given by those who have examined large num-bers of pelves are measurements obtained in this manner. The distance between the anterior superior spines of the ilia is foundto be, in the average pelvis, 26J cms. or 10 inches ; the distance b
. A treatise on obstetrics for students and practitioners . b and Anger rest just above the termination ofeach limb of the pelvimeter. He should remember to take his measure-ments from the outer side of each landmark upon the ilia. There is no 44 PREGNANCY AND LABOR. good reason for this injunction, except the fact that such is usage, andthat the measurements given by those who have examined large num-bers of pelves are measurements obtained in this manner. The distance between the anterior superior spines of the ilia is foundto be, in the average pelvis, 26J cms. or 10 inches ; the distance be-tween the outermost points of the crests of the ilia is 28 cms. or 11inches ; between the trochanters is normally found to be 32 cms. or13 and a fraction inches. These are measurements giving the widthof the pelvis, and the relationship existing between them is of practicalimportance. Thus, in cases where the proportion between the first twomeasurements is lost or is reversed further examination will show thatdisease of the skeleton is present. Fig. Making transverse measurements of the pelvis. The oblique measurements of the pelvis, which may be made uponthe living patient, are taken from the posterior superior iliac spine ofone side to the anterior superior iliac spine on the other. There is nor-mally a slight difference in these measurements, owing to the fact thatthe right oblique diagonal of the bony pelvis is often a little larger thanthe left. This diagonal—the right oblique—normally measures from22 to 23 cms., while the left, from the left posterior superior spine ofthe ilium to the right anterior superior spiue, measures 22 to 22J cms.,or 8f inches. To make the oblique measurements at the brim of thepelvis the patient should lie, not upon the back, but turned, raisingslightly the side whose oblique measurement is desired. Even in fatwomen it is possible to outline these landmarks sufficiently plainly toenable the measurements to be taken. The external conjug
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectobstetrics, bookyear1
