130 
MANUAL OF MODERN FARRIER V. 
This will be indicated by the horse dragging the Jimb after 
him, or by his resting it on the fetlock-joint. The muscles 
of the inside of the thigh are sometimes sprained, which is 
known by the heat in all the contiguous parts. 
Remedies. —For dislocation of the patella, the aid of a 
veterinary surgeon will be absolutely necessary. In case of 
muscles being sprained, fomentations must be used ; and 
bleeding in some instances may be necessary, accompanied 
by doses of laxative medicine, as recommended at page 132. 
THOROUGHPIN. 
In treating of wind-galls, we described certain little bags 
or sacs, containing a fluid for lubricating the joints. These, 
we mentioned, sometimes become inflamed and enlarged : 
similar sacs are situated contiguous to the hock-joint, and 
these also are liable to inflammation, and produce swellings 
of greater or lesser dimensions immediately under the strong 
tendon which unites with the cap of the hock. These 
swellings generally protrude on both sides, in the form of 
round swellings. Sometimes when the coverings of the 
tumour yield more readily in one direction than another, it 
will protrude principally in that part. The nature of the 
complaint is precisely the same as wind-galls, but from its 
situation has been termed thoroughpin, (see plate 7, fig. 3, 
e e , and 5,5 5.) These swellings generally produce stiffness 
of the joint, which sometimes wears off when exercise has 
induced absorption of the fluid which these bags contain. 
However, it is only when the sacs become large that they occa¬ 
sion any inconvenience to the action of the limb. Many per¬ 
sons think thoroughpin of but little consequence ; but after 
a hard day’s work, a horse will always manifest stiffness in 
the joint in which these swellings exist. And although a 
horse cannot strictly be called unsound which is afflicted 
