58 



VETERINARY SURGICAL OPERATIONS 



sume enormous proportions and become exceedingly hard, 

 especially while the leg is supporting weight, or else it may 

 remain small and markedly fluctuant. In some instances 

 thoroughpin produces an exceedingly obstinate lameness, 

 that yields to firing, blistering and prolonged rest, but recurs 



Fig. 26— Thoroughpin of the 



Tarsus. 



Fig. 27— Method of Holding Trocar 

 and Canula. 



again after a brief period of hard work. In these cases, the 

 distention can be traced through the hock downward to the 

 inferior extremity of the sheath at the upper third of the 

 metatarsus, where a pronounced dilatation announces the dif- 

 fusion and the seriousness of the inflammation. 



Thoroughpin often co-exists with bog-spavin, but the two 



