Pelvic Constriction 



675 



diet, it is not rare to meet with rachitic deformity of the pelvis 

 which leads to serious dystokia and renders it wholly impossible 

 to extract thefetus through the pelvis. In a series of cases of 

 dystokia recorded by De Bruin in the sow, (B. T. W., January 

 3, 1907) the pelvis was so constricted from rachitis as to barely 

 admit two fingers to pass through it. Hysterotomy became 

 irecessary. 



b.^ Callus from Healed Pelvic Fractures. We occasionally 

 meet with fractures of the pelvis in which, when the animal 

 recovers, there remains an enlarged callus, with perhaps some 

 additional deformation by one fractured portion of the pelvic 

 girdle pushing inward, so that it may greatly narrow and 

 obstruct the pelvic canal, rendering birth through it exceedingly 

 difficult or quite impossible. These cases are not very common, 

 but occur in the experience of most veterinary obstetrists, and 

 constantly suggest that a female which has suffered from a 

 fracture of the pelvis should not be used for breeding purposes, 

 except the pelvis has first been examined and found to be suf- 

 ficientlj' wide to permit of safe birth. 



Fig. 112. Constricted Pelvis of Mare, inducing Irremedial Dystokia. 

 Disi<ocATiON OF Right Sacro-ii<iac Articulation. 

 Green-stick Fracture through Right Acetabulum. 

 Non-union of Fracture of Left Iliac Shaft. 



