. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 204 PELVIS. Since we know that the foetus in utero is subject to similar pathological changes to those of childhood, it seems probable that a modi- fication of the two theories may be the true statement of the origin of this formation —viz., an occurrence of inflammation and the patho- logical changes usually consequent upon this process in joints—such as ankylosis, happening at a period of immaturity, coincident with, or consequent upon, an arrest of development in the structures implicated, and probably having the same
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 204 PELVIS. Since we know that the foetus in utero is subject to similar pathological changes to those of childhood, it seems probable that a modi- fication of the two theories may be the true statement of the origin of this formation —viz., an occurrence of inflammation and the patho- logical changes usually consequent upon this process in joints—such as ankylosis, happening at a period of immaturity, coincident with, or consequent upon, an arrest of development in the structures implicated, and probably having the same ultimate cause. The three cases before quoted from Naegele, in which the deficiency of the sacrum and the oblique deformity existed, but without the ankylosis, and on the other hand,the many cases in which we have ankylosis on one or both sides with- out the oblique deformity, show that the two conditions may occur separately and indepen- dently of each other. These cases also prove beyond a doubt, that the sacro-iliac ankylosis of itself does not produce the deformity ; and, moreover, that it is not absolutely an essen- tial, although a frequent accompaniment of this peculiar formation. A third supposition alluded to by Naegele, that the ankylosis anil oblique distortion is caused by increased pressure from the lateral divergence of the vertebral curve in early youth, seems to be contravened by the fact, that such a pressure does not produce such a result in the many instances of other pelvic deformities. The tendency to an unsym- metrical one-sided distortion in the instances before alluded to, presents many differences to, and more variations of form than, the defor- mity under consideration. The mechanism of this deformity in re- spect to the line of gravity of the body fall- ing nearer to the acetabulum of the anky- losed side, and so throwing the weight of the body more on to the corresponding leg than on its fellow, will present some similarities to that of the one
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