la:\ieness in the fore lec; 145 



A local enlargement occurs at the anterior carpal region and 

 the mass is somewhat tiuctuating, extravasated fluids becoming 

 infected in many instances, and necrosis of the skin and fascia 

 provide means for spontaneous discharge of the contents of 

 the enlargement if it is not opened. The infection when it 

 becomes generalized causes a fatal termination in most cases that 

 are not treated. 



Fig. 25 — "Fish knees." 



^Photo by Thos. Millar, SI. R. C. V. S. 



Native stock owners of some parts of Canada know this con- 

 dition as "fish knees" because of the presence of the ruptured 

 end of the extensor tendon which is found coiled in the cavity of 

 the enlargements caused by the ruptured tendon. 



Local practitioners have treated the condition by incising the 

 swollen mass and removing the part of tendon contained within 

 such cavities. Treatment has not proved entirely satisfactory 

 in the majority of instances, perhaps because of tardy inter- 

 ference. 



In a colt's leg sent the author by .Mr. Thoma.s ]\Iillar, Isl. R. 

 C. V. S., of Asquith, Saskatchewan, a careful dissection of the 

 carpal region revealed the fact that in this case the ruptured 

 extensor tendon was due to injury. The colt may have been 

 trampled upon by its dam in such manner that the tendon was 

 divided. No noticeable evidence of injury to the skin was to be 

 seen on its outer surface, but on the fascial side a cyanotic con- 

 gested area, which was situated immediately over the site of the 

 ruptured tendon, was very evident. 



