FIG. 97. The dotted lines outline the V-shaped portion of wall to be removed in the treatment of complicated toe-crack.
Fig. 98. The dotted lines indicate the portion of wall to be removed in the complete operation for complicated toe-crack.
(d) By stripping the Wall from the Coronary Margin to its wearing Edge on Either Side of the Crack.—This is merely a more extensive application of the method just described, and is only indicated in a complete and complicated crack that has refused to yield to other modes of treatment (see Fig. 98).
As in the previous case, a groove is run from a to c. The grooves ab and de are then continued to the lowermost edge of the wall, and the whole of the wall within these points removed. To facilitate removal, the white line should be grooved between the points b and d. After-treatment is exactly the same as that just referred to.
B. CORNS.
Definition.—In veterinary surgery the term 'corn' is used to indicate the changes following upon a bruise to that portion of the sensitive sole between the wall and the bar. Usually they occur in the fore-feet, and are there found more often in the inner than in the outer heel.
The changes are those depending upon the amount of hæmorrhage and the accompanying inflammatory phenomena occasioned by the injury.
Thus, with the hæmorrhage we get ecchymosis, and consequent red staining of the surrounding structures. As is the case with extravasations of blood elsewhere, the hæmoglobin of the escaped corpuscles later undergoes a series of changes, giving rise to a succession of brown, blue, greenish and yellowish coloration.