756 
DISEASES OF THE METATAKSUS. 
fires deeply with the pointed iron. Repeated withdrawal of contents, by 
means of Pravaz’s syringe, is sometimes very efficacious. The opera¬ 
tion may be repeated every four to six weeks, though careful antisepsis 
is required to prevent infection of the tendon sheath. For many years 
French operators have recommended withdrawal of the contents, followed 
by iodine injections. Cadiot describes the results as excellent. McCall 
withdraws almost the entire contents of the enlargement and then injects 
Fig. 280. External surface of the horse’s hock, to show synovial sheaths, a , Tendon sheath 
of the extensor pedis muscle ; b, tendon sheath of peroneus muscle ; c, c 7 , tendon 
sheath of ilexox perforatus and gastrocnemius muscles ; d, protrusion of the synovial can- 
sule of the true hock-joint. 1 
a l per cent, alcoholic solution of sublimate, to which decolorised tincture 
of iodine has been added. Frick has several times withdrawn the fluid 
and then injected a solution containing iodine 2 parts, iodide of 
potassium 5 parts, and water 100 parts ; thereafter he has lightly 
hied the paits in lines. Fte states that the results varied, but were 
never bad. 
(b) Distension of the extensor tendon sheath in the hock region. The 
tendon of the peroneus muscle is provided, opposite the lower margin of 
the hock-joint and on its outer aspect, with a small sheath, which, when 
