The American text-book of obstetrics for practitioners and students . m sinks far downinto the pelvic canal and is sharply curved or bent from above downward;the innominate bones are bent at a sharp angle laterally, and the acetabula arepressed inward upon the pelvic canal. When at length the bone disease hasrun its course the pelvis is firmly set, by the hardening of the bones, in itsunnatural position and shape. The differential diagnosis between this pelvisand the true osteomalacic pelvis is made by the direction of the iliac crests, bythe firm constitution of the bones after the disease ha
The American text-book of obstetrics for practitioners and students . m sinks far downinto the pelvic canal and is sharply curved or bent from above downward;the innominate bones are bent at a sharp angle laterally, and the acetabula arepressed inward upon the pelvic canal. When at length the bone disease hasrun its course the pelvis is firmly set, by the hardening of the bones, in itsunnatural position and shape. The differential diagnosis between this pelvisand the true osteomalacic pelvis is made by the direction of the iliac crests, bythe firm constitution of the bones after the disease has been arrested, and bythe signs of rachitis in other portions of the body. Osteomalacia, besides, hascertain peculiarities of its own that enable one to recognize it without difficulty(PI. 31, Figs. 5, 6, 7 ; PI. 32, Fig. 1). Diagnosis.—The diagnosis of a rachitic pelvis is made by external andinternal measurements, by palpation of the exterior and interior of the pelvis,by the womans history, and by her appearance. An individual who has had DYSTO I \. Plate 1. Pseudo-osteomalacia. 2. Rachitic pelvis with contracted anteroposterior diameter throughout the pel-vic canal (Mutter Museum. College of Physicians, Philadelphia). 3. Pendulous belly of rachitis (Charpen-tier). 4. Rachitic pelvis with double promontory Mutter Museum, College of Physicians . 5,6. Minor gradesof osteomalacic pelves. 7. Osteomalacia, Bhowing asymmetrical contraction at outlet. DYSTOCIA. 19 rachitis in childhood is usually of small stature, with short, thick, carvedextremities, a low broad brow, a large square head, a flat nose, a chickenbreast/ and enlarged joints. The Lumbar lordosis and the rotation of thesacrum produce a sway-back, mosl uoticeable when tli*- woman lies on herback upon a bard surface. When she stand- ered the pregnant uterus nearterm tails abnormally forward and downward, on acts t of the short abdo-men and lack of engagement of the presenting part (PI. 32, Fig. 3). The mostcharac
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